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711.4508
Hiroshi Ishikawa
Hiroshi Ishikawa
Representation and Measure of Structural Information
Second version. Revised the Introduction and added more discussion in the last section. The technical content is mostly unchanged. 51 pages, 4 figures
null
null
null
cs.CC cs.CV cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We introduce a uniform representation of general objects that captures the regularities with respect to their structure. It allows a representation of a general class of objects including geometric patterns and images in a sparse, modular, hierarchical, and recursive manner. The representation can exploit any computable regularity in objects to compactly describe them, while also being capable of representing random objects as raw data. A set of rules uniformly dictates the interpretation of the representation into raw signal, which makes it possible to ask what pattern a given raw signal contains. Also, it allows simple separation of the information that we wish to ignore from that which we measure, by using a set of maps to delineate the a priori parts of the objects, leaving only the information in the structure. Using the representation, we introduce a measure of information in general objects relative to structures defined by the set of maps. We point out that the common prescription of encoding objects by strings to use Kolmogorov complexity is meaningless when, as often is the case, the encoding is not specified in any way other than that it exists. Noting this, we define the measure directly in terms of the structures of the spaces in which the objects reside. As a result, the measure is defined relative to a set of maps that characterize the structures. It turns out that the measure is equivalent to Kolmogorov complexity when it is defined relative to the maps characterizing the structure of natural numbers. Thus, the formulation gives the larger class of objects a meaningful measure of information that generalizes Kolmogorov complexity.
[ { "version": "v1", "created": "Wed, 28 Nov 2007 18:41:30 GMT" }, { "version": "v2", "created": "Thu, 12 Jun 2008 03:37:52 GMT" } ]
2008-06-12T00:00:00
[ [ "Ishikawa", "Hiroshi", "" ] ]
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711.4509
Rikard Olofsson
Rikard Olofsson
Large supremum norms and small Shannon entropy for Hecke eigenfunctions of quantized cat maps
21 pages and 4 figures
null
10.1007/s00220-008-0627-x
null
math.NT math-ph math.MP
null
This paper concerns the behavior of eigenfunctions of quantized cat maps and in particular their supremum norm. We observe that for composite integer values of N, the inverse of Planck's constant, some of the desymmetrized eigenfunctions have very small support and hence very large supremum norm. We also prove an entropy estimate and show that our functions satisfy equality in this estimate. In the case when N is a prime power with even exponent we calculate the supremum norm for a large proportion of all desymmetrized eigenfunctions and we find that for a given N there is essentially at most four different values these assume.
[ { "version": "v1", "created": "Wed, 28 Nov 2007 14:18:51 GMT" } ]
2009-11-13T00:00:00
[ [ "Olofsson", "Rikard", "" ] ]
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711.451
Zden\v{e}k Mikul\'a\v{s}ek
Z. Mikulasek
The benefits of the orthogonal LSM models
5 pages, 2 figures, submitted to Odessa Astronomical Publications, vol. 20, 2007
null
null
null
astro-ph
null
In the last few decades both the volume of high-quality observing data on variable stars and common access to them have boomed; however the standard used methods of data processing and interpretation have lagged behind this progress. The most popular method of data treatment remains for many decades Linear Regression (LR) based on the principles of Least Squares Method (LSM) or linearized LSM. Unfortunately, we have to state that the method of linear regression is not as a rule used accordingly namely in the evaluation of uncertainties of the LR parameters and estimates of the uncertainty of the LR predictions. We present the matrix version of basic relations of LR and the true estimate of the uncertainty of the LR predictions. We define properties of the orthogonal LR models and show how to transform general LR models into orthogonal ones. We give relations for orthogonal models for common polynomial series.
[ { "version": "v1", "created": "Wed, 28 Nov 2007 14:51:25 GMT" } ]
2007-11-29T00:00:00
[ [ "Mikulasek", "Z.", "" ] ]
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711.4511
Dmitriy Kulikov
D. A. Kulikov and R. S. Tutik
A new approach to the relativistic treatment of the fermion-boson system, based on the extension of the SL(2,C) group
v3: revised version (to appear in Mod. Phys. Lett. A)
Mod.Phys.Lett.A23:1829-1840,2008
10.1142/S0217732308027205
null
hep-th
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A new technique for constructing the relativistic wave equation for the two-body system composed of the spin-1/2 and spin-0 particles is proposed. The method is based on the extension of the SL(2,C) group to the Sp(4,C) one. The obtained equation includes the interaction potentials, having both the Lorentz-vector and Lorentz-tensor structure, exactly describes the relativistic kinematics and possesses the correct one-particle limits. The comparison with results of other approaches to this problem is discussed.
[ { "version": "v1", "created": "Wed, 28 Nov 2007 14:36:24 GMT" }, { "version": "v2", "created": "Thu, 29 Nov 2007 12:21:17 GMT" }, { "version": "v3", "created": "Tue, 15 Jul 2008 10:00:12 GMT" } ]
2008-11-26T00:00:00
[ [ "Kulikov", "D. A.", "" ], [ "Tutik", "R. S.", "" ] ]
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711.4512
Marco Morelli
M.J. Morelli, R.J. Allen, S. Tanase-Nicola, P.R. ten Wolde
Eliminating fast reactions in stochastic simulations of biochemical networks: a bistable genetic switch
46 pages, 5 figures
null
10.1063/1.2821957
null
q-bio.QM q-bio.MN
null
In many stochastic simulations of biochemical reaction networks, it is desirable to ``coarse-grain'' the reaction set, removing fast reactions while retaining the correct system dynamics. Various coarse-graining methods have been proposed, but it remains unclear which methods are reliable and which reactions can safely be eliminated. We address these issues for a model gene regulatory network that is particularly sensitive to dynamical fluctuations: a bistable genetic switch. We remove protein-DNA and/or protein-protein association-dissociation reactions from the reaction set, using various coarse-graining strategies. We determine the effects on the steady-state probability distribution function and on the rate of fluctuation-driven switch flipping transitions. We find that protein-protein interactions may be safely eliminated from the reaction set, but protein-DNA interactions may not. We also find that it is important to use the chemical master equation rather than macroscopic rate equations to compute effective propensity functions for the coarse-grained reactions.
[ { "version": "v1", "created": "Wed, 28 Nov 2007 14:36:40 GMT" } ]
2009-11-13T00:00:00
[ [ "Morelli", "M. J.", "" ], [ "Allen", "R. J.", "" ], [ "Tanase-Nicola", "S.", "" ], [ "Wolde", "P. R. ten", "" ] ]
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711.4513
Helmut Friedrich
Helmut Friedrich
Conformal classes of asymptotically flat, static vacuum data
23 pages
Class.Quant.Grav.25:065012,2008
10.1088/0264-9381/25/6/065012
null
gr-qc
null
We show that time-reflection symmetric, asymptotically flat, static vacuum data which admit a non-trivial conformal rescaling which leads again to such data must be axi-symmetric and admit a conformal Killing field. Moreover, it is shown that there exists a 3-parameter family of such data.
[ { "version": "v1", "created": "Wed, 28 Nov 2007 14:40:42 GMT" }, { "version": "v2", "created": "Mon, 18 Feb 2008 14:30:44 GMT" } ]
2008-11-26T00:00:00
[ [ "Friedrich", "Helmut", "" ] ]
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711.4514
Pierre Etore
Pierre Etore (CERMICS), Benjamin Jourdain (CERMICS)
Adaptive optimal allocation in stratified sampling methods
null
null
null
null
stat.ME stat.CO
null
In this paper, we propose a stratified sampling algorithm in which the random drawings made in the strata to compute the expectation of interest are also used to adaptively modify the proportion of further drawings in each stratum. These proportions converge to the optimal allocation in terms of variance reduction. And our stratified estimator is asymptotically normal with asymptotic variance equal to the minimal one. Numerical experiments confirm the efficiency of our algorithm.
[ { "version": "v1", "created": "Wed, 28 Nov 2007 14:52:08 GMT" }, { "version": "v2", "created": "Fri, 30 Nov 2007 12:59:04 GMT" } ]
2007-12-04T00:00:00
[ [ "Etore", "Pierre", "", "CERMICS" ], [ "Jourdain", "Benjamin", "", "CERMICS" ] ]
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711.4515
Mario Silveirinha G.
Mario G. Silveirinha, Carlos A. Fernandes, Jorge R. Costa
Additional Boundary Condition for a Wire Medium Connected to a Metallic Surface
26 pages; under review
null
10.1088/1367-2630/10/5/053011
null
cond-mat.mtrl-sci
null
In this work, we demonstrate that the interaction of electromagnetic waves with a microstructured material formed by metallic wires connected to a metallic surface can be described using homogenization methods provided an additional boundary condition is considered. The additional boundary condition is derived by taking into account the specific microstructure of the wire medium. To illustrate the application of the result, we characterize a substrate formed by an array of tilted metallic wires connected to a ground plane, demonstrating that in such configuration the wire medium behaves essentially as a material with extreme optical anisotropy and that in some circumstances the substrate can be seen as an impedance surface.
[ { "version": "v1", "created": "Wed, 28 Nov 2007 14:55:16 GMT" } ]
2009-11-13T00:00:00
[ [ "Silveirinha", "Mario G.", "" ], [ "Fernandes", "Carlos A.", "" ], [ "Costa", "Jorge R.", "" ] ]
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711.4516
Jocelyne Troccaz
Philippe Merloz (CHU-Grenoble ortho-traumato), Jocelyne Troccaz (TIMC), Herv\'e Vouaillat (CHU-Grenoble ortho-traumato), Christian Vasile (CHU-Grenoble ortho-traumato), J\'er\^ome Tonetti (CHU-Grenoble ortho-traumato), Ahmad Eid (CHU-Grenoble ortho-traumato), St\'ephane Plaweski (CHU-Grenoble ortho-traumato)
Fluoroscopy-based navigation system in spine surgery
null
Proceedings of the Institution of Mechanical Engineers. Part H, Journal of Engineering in Medicine 221, 7 (2007) 813-20
null
null
cs.OH
null
The variability in width, height, and spatial orientation of a spinal pedicle makes pedicle screw insertion a delicate operation. The aim of the current paper is to describe a computer-assisted surgical navigation system based on fluoroscopic X-ray image calibration and three-dimensional optical localizers in order to reduce radiation exposure while increasing accuracy and reliability of the surgical procedure for pedicle screw insertion. Instrumentation using transpedicular screw fixation was performed: in a first group, a conventional surgical procedure was carried out with 26 patients (138 screws); in a second group, a navigated surgical procedure (virtual fluoroscopy) was performed with 26 patients (140 screws). Evaluation of screw placement in every case was done by using plain X-rays and post-operative computer tomography scan. A 5 per cent cortex penetration (7 of 140 pedicle screws) occurred for the computer-assisted group. A 13 per cent penetration (18 of 138 pedicle screws) occurred for the non computer-assisted group. The radiation running time for each vertebra level (two screws) reached 3.5 s on average in the computer-assisted group and 11.5 s on average in the non computer-assisted group. The operative time for two screws on the same vertebra level reaches 10 min on average in the non computer-assisted group and 11.9 min on average in the computer-assisted group. The fluoroscopy-based (two-dimensional) navigation system for pedicle screw insertion is a safe and reliable procedure for surgery in the lower thoracic and lumbar spine.
[ { "version": "v1", "created": "Wed, 28 Nov 2007 15:19:15 GMT" } ]
2007-11-29T00:00:00
[ [ "Merloz", "Philippe", "", "CHU-Grenoble ortho-traumato" ], [ "Troccaz", "Jocelyne", "", "TIMC" ], [ "Vouaillat", "Hervé", "", "CHU-Grenoble ortho-traumato" ], [ "Vasile", "Christian", "", "CHU-Grenoble ortho-traumato" ], [ "Tonetti", "Jérôme", "", "CHU-Grenoble\n ortho-traumato" ], [ "Eid", "Ahmad", "", "CHU-Grenoble ortho-traumato" ], [ "Plaweski", "Stéphane", "", "CHU-Grenoble ortho-traumato" ] ]
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711.4517
Werner Rodejohann
Sandip Pakvasa, Werner Rodejohann, Thomas J. Weiler
Flavor Ratios of Astrophysical Neutrinos: Implications for Precision Measurements
32 pages, 15 figures. Minor changes, matches version in JHEP
JHEP0802:005,2008
10.1088/1126-6708/2008/02/005
null
hep-ph astro-ph hep-ex
null
We discuss flavor-mixing probabilities and flavor ratios of high energy astrophysical neutrinos. In the first part of this paper, we expand the neutrino flavor-fluxes in terms of the small parameters U_{e3} and pi/4 - theta_{23}, and show that there are universal first and second order corrections. The second order term can exceed the first order term, and so should be included in any analytic study. We also investigate the probabilities and ratios after a further expansion around the tribimaximal value of sin^2 theta_{12} = 1/3. In the second part of the paper, we discuss implications of deviations of initial flavor ratios from the usually assumed, idealized flavor compositions for pion, muon-damped, and neutron beam sources, viz., (1 : 2 : 0), (0 : 1 : 0), and (1 : 0 : 0), respectively. We show that even small deviations have significant consequences for the observed flavor ratios at Earth. If initial flavor deviations are not taken into account in analyses, then false inferences for the values in the PMNS matrix elements (angles and phase) may result.
[ { "version": "v1", "created": "Wed, 28 Nov 2007 15:29:22 GMT" }, { "version": "v2", "created": "Fri, 8 Feb 2008 16:02:37 GMT" } ]
2008-11-26T00:00:00
[ [ "Pakvasa", "Sandip", "" ], [ "Rodejohann", "Werner", "" ], [ "Weiler", "Thomas J.", "" ] ]
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711.4518
Paolo Privitera
M. Ave, et al. (AIRFLY Collaboration)
Energy Dependence of Air Fluorescence Yield measured by AIRFLY
presented at the 5th Fluorescence Workshop, El Escorial - Madrid, Spain, 16 - 20 September 2007, to appear in Nuclear Instruments and Methods A
null
null
null
astro-ph
null
In the fluorescence detection of ultra high energy (> 10**18 eV) cosmic rays, the number of emitted fluorescence photons is assumed to be proportional to the energy deposited in air by shower particles. We have performed measurements of the fluorescence yield in atmospheric gases excited by electrons over energies ranging from keV to hundreds of MeV in several accelerators. We found that within the measured energy ranges the proportionality holds at the level of few %.
[ { "version": "v1", "created": "Wed, 28 Nov 2007 15:29:45 GMT" } ]
2007-11-29T00:00:00
[ [ "Ave", "M.", "" ] ]
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711.4519
Alessio Figalli
Albert Fathi, Alessio Figalli
Optimal transportation on non-compact manifolds
null
null
null
null
math.OC math.DG
null
In this work, we show how to obtain for non-compact manifolds the results that have already been done for Monge Transport Problem for costs coming from Tonelli Lagrangians on compact manifolds. In particular, the already known results for a cost of the type $d^r,r>1$, where $d$ is the Riemannian distance of a complete Riemannian manifold, hold without any curvature restriction.
[ { "version": "v1", "created": "Wed, 28 Nov 2007 15:31:43 GMT" } ]
2007-11-29T00:00:00
[ [ "Fathi", "Albert", "" ], [ "Figalli", "Alessio", "" ] ]
[ 0.0279019382, -0.0735399947, 0.0248017237, -0.029608259, -0.0218577199, -0.0069394358, -0.0600816943, 0.0193463061, -0.1079547852, -0.0505166873, -0.0086517641, 0.0308339261, -0.0591684543, -0.0488824658, 0.0599855632, -0.0371064544, 0.0453736968, -0.0846430883, 0.0756068006, 0.0931506604, 0.052006714, -0.0151526034, 0.0450853035, -0.05224704, -0.0831530616, -0.0071737543, 0.0351357758, 0.0714731812, 0.038380187, -0.0683489367, 0.0248017237, -0.0497957096, -0.0063145859, -0.0907473937, 0.0067591905, 0.0933429226, 0.0343667306, 0.0803172067, -0.0369862914, 0.0383080877, -0.0234318599, 0.1351597756, -0.0193943717, -0.0002818207, 0.0068733459, 0.056044206, 0.0532083474, 0.0336457491, -0.0139269363, 0.0488824658, -0.0821436942, 0.0181086231, -0.0340783373, -0.1481374204, -0.0903628692, 0.0686853901, -0.0030656685, 0.0127853844, 0.1414082795, -0.0754626095, -0.0233116969, -0.0851718113, 0.0358086899, 0.0501802303, -0.0168348905, 0.0399903767, -0.1153568551, 0.0039233346, -0.0351357758, -0.007095648, -0.1342945993, -0.0467675924, 0.0796923563, -0.0236721877, 0.0059871408, -0.0905070677, -0.0046893763, 0.1259312332, -0.0060141776, 0.0032684442, -0.029367933, 0.0048816376, 0.1134342402, -0.0117219388, -0.0060622431, -0.0748858228, -0.0163422208, -0.0307618268, -0.11727947, -0.0980052575, 0.0715693161, -0.0299687497, 0.0304494034, 0.0778658763, 0.1055515185, -0.0391972959, 0.1465032101, 0.0970439538, 0.0156933386, 0.022061998, -0.0509973429, -0.0706080049, 0.1399663091, 0.0158615671, 0.1430425048, 0.0276856441, -0.0224825703, 0.0386926122, -0.0238764659, 0.1355443001, 0.0329247676, -0.0427541323, -0.008213168, 0.136313349, 0.0204397924, -0.0004513637, -0.1021869481, -0.0154770445, -0.0429704264, -0.0320355594, -0.0040044449, -0.0606584772, 0.0645998344, -0.0220499821, 0.0412400737, -0.0673395619, -0.0274453182, -0.1039173007, -0.0743571073, -0.0695505664, 0.1726507545, -0.0211487561, 0.0356404595, -0.0163061712, -0.0020953491, 0.0502763614, -0.0003439677, 0.0059751244, 0.0621965714, -0.0558519438, -0.0359528847, 0.0163302049, -0.0382840559, 0.0213410184, 0.0132540213, 0.0907473937, 0.001137046, 0.0859889239, 0.1135303676, 0.0415284671, -0.0466474257, -0.0385484137, -0.0557558127, 0.0183729827, -0.0397981144, -0.0635424033, 0.0492669903, 0.0312424805, 0.0335015543, -0.0878154039, 0.012941597, 0.0742129087, -0.062484961, -0.0578706861, 0.088488318, 0.06685891, -0.0425859056, -0.0334775187, -0.0369862914, -0.1050708666, -0.040855553, -0.0544580482, -0.088728644, 0.0092645977, 0.0391972959, -0.0321797542, -0.1220860034, -0.0548425689, 0.0144556556, 0.0276375785, 0.0170151349, 0.1189136878, 0.0208964124, -0.0475606695, -0.0611391328, 0.0198509917, -0.0814227089, 0.0610430017, 0.0564287268, 0.0419610552, -0.03895697, 0.0863253772, 0.0195145346, 0.0972362161, -0.0685892627, -0.0438356027, 0.016894972, 0.0259072259, 0.0077805794, -0.0602739565, 0.0701754168, -0.1148761958, 0.0781542659, 0.0556116179, -0.1117038876, -0.0345349573, 0.0497957096, 0.1097812727, 0.0238524321, 0.0054854588, -0.010472239, 0.0409516841, 0.0087719271, 0.0905551314, -0.0909396559, 0.0303773042, -0.0955539271, 0.0781062022, 0.014299443, 0.0573419705, -0.0228190273, -0.0086277314, 0.068300873, -0.0791636407, 0.0569093823, 0.0057167732, -0.0515741259, -0.0660898611, 0.0134462835, -0.0357125588, 0.1343907267, -0.0285267886, -0.1525594443, -0.0455419235, 0.0565248579, -0.0086337393, 0.0263398141, -0.0871905535, -0.0465753302, -0.0424417071, 0.0195505824, -0.0635424033, -0.0046953843, -0.0862773135, -0.0054734424, 0.0269646645, -0.0247776899, -0.0409276485, 0.0362893417, 0.0548425689, -0.0100336429, 0.0278538726, 0.0652246848, -0.0409997478, -0.0925738737, 0.0824801475 ]
711.452
Alessandro Fabbri
Roberto Balbinot, Alessandro Fabbri, Serena Fagnocchi, Alessio Recati and Iacopo Carusotto
Non-local density correlations as signal of Hawking radiation in BEC acoustic black holes
Strongly revised version. 5 pages, 3 eps figures
Phys.Rev.A78:021603,2008
10.1103/PhysRevA.78.021603
null
cond-mat.other gr-qc hep-th
null
We have used the analogy between gravitational systems and non-homogeneous fluid flows to calculate the density-density correlation function of an atomic Bose-Einstein condensate in the presence of an acoustic black hole. The emission of correlated pairs of phonons by Hawking-like process results into a peculiar long-range density correlation. Quantitative estimations of the effect are provided for realistic experimental configurations.
[ { "version": "v1", "created": "Wed, 28 Nov 2007 15:35:41 GMT" }, { "version": "v2", "created": "Mon, 12 May 2008 11:57:05 GMT" } ]
2009-07-20T00:00:00
[ [ "Balbinot", "Roberto", "" ], [ "Fabbri", "Alessandro", "" ], [ "Fagnocchi", "Serena", "" ], [ "Recati", "Alessio", "" ], [ "Carusotto", "Iacopo", "" ] ]
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711.4521
Paul M. Bellan
P. M. Bellan
Consideration of the relationship between Kepler and cyclotron dynamics leading to prediction of a non-MHD gravity-driven Hamiltonian dynamo
14 pages, 1 figure
Physics of Plasmas Vol. 14, Art. No. 122901 (2007)
10.1063/1.2815791
null
astro-ph
null
Conservation of canonical angular momentum shows that charged particles are typically constrained to stay within a poloidal Larmor radius of a poloidal magnetic flux surface. However, more detailed consideration shows that particles with a critical charge to mass ratio can have zero canonical angular momentum and so be both immune from centrifugal force and not constrained to stay in the vicinity of a specific flux surface. Suitably charged dust grains can have zero canonical angular momentum and in the presence of a gravitational field will spiral inwards across poloidal magnetic surfaces toward the central object and accumulate. This accumulation results in a gravitationally-driven dynamo, i.e., a mechanism for converting gravitational potential energy into a battery-like electric power source.
[ { "version": "v1", "created": "Wed, 28 Nov 2007 16:04:02 GMT" } ]
2009-11-13T00:00:00
[ [ "Bellan", "P. M.", "" ] ]
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711.4522
Harald W. Griesshammer
Harald W. Griesshammer (George Washington U.)
Estimating Consequences of 3-Body Forces
3 pages LaTeX2e, including 1 figure as .eps file embedded with includegraphicx. Uses FBSart (included). Contribution to the 20th European Conference on Few-Body Problems in Physics EFB20, Pisa (Italy), 10th -- 14th September 2007. To be published in Few-Body Systems
Few Body Syst.44:137-140,2008
10.1007/s00601-008-0275-x
null
nucl-th
null
Classifying the strengthes of three-body forces 3BFs with the condition that observables must be cut-off independent, i.e. renormalised at each order, leads to surprising results with relevance for example for thermal neutron capture on the deuteron. Details and a better bibliography in Ref. [1].
[ { "version": "v1", "created": "Wed, 28 Nov 2007 15:51:42 GMT" } ]
2009-01-16T00:00:00
[ [ "Griesshammer", "Harald W.", "", "George Washington U." ] ]
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711.4523
Jocelyne Troccaz
Thomas Martinelli (CHU-Grenoble radio), Jean-Luc Bosson (TIMC, CHU-Grenoble CIC), Luc Bressollette, Franck Pelissier, Eric Boidard (TIMC), Jocelyne Troccaz (TIMC), Philippe Cinquin (TIMC)
Robot-based tele-echography: clinical evaluation of the TER system in abdominal aortic exploration
null
Journal of ultrasound in medicine : official journal of the American Institute of Ultrasound in Medicine 26, 11 (2007) 1611-6
null
null
cs.OH
null
OBJECTIVE: The TER system is a robot-based tele-echography system allowing remote ultrasound examination. The specialist moves a mock-up of the ultrasound probe at the master site, and the robot reproduces the movements of the real probe, which sends back ultrasound images and force feedback. This tool could be used to perform ultrasound examinations in small health care centers or from isolated sites. The objective of this study was to prove, under real conditions, the feasibility and reliability of the TER system in detecting abdominal aortic and iliac aneurysms. METHODS: Fifty-eight patients were included in 2 centers in Brest and Grenoble, France. The remote examination was compared with the reference standard, the bedside examination, for aorta and iliac artery diameter measurement, detection and description of aneurysms, detection of atheromatosis, the duration of the examination, and acceptability. RESULTS: All aneurysms (8) were detected by both techniques as intramural thrombosis and extension to the iliac arteries. The interobserver correlation coefficient was 0.982 (P < .0001) for aortic diameters. The rate of concordance between 2 operators in evaluating atheromatosis was 84% +/- 11% (95% confidence interval). CONCLUSIONS: Our study on 58 patients suggests that the TER system could be a reliable, acceptable, and effective robot-based system for performing remote abdominal aortic ultrasound examinations. Research is continuing to improve the equipment for general abdominal use.
[ { "version": "v1", "created": "Wed, 28 Nov 2007 15:51:02 GMT" } ]
2007-11-29T00:00:00
[ [ "Martinelli", "Thomas", "", "CHU-Grenoble radio" ], [ "Bosson", "Jean-Luc", "", "TIMC,\n CHU-Grenoble CIC" ], [ "Bressollette", "Luc", "", "TIMC" ], [ "Pelissier", "Franck", "", "TIMC" ], [ "Boidard", "Eric", "", "TIMC" ], [ "Troccaz", "Jocelyne", "", "TIMC" ], [ "Cinquin", "Philippe", "", "TIMC" ] ]
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711.4524
Pintu Das
P. Das, M. R. Koblischka, Th. Wolf, P. Adelmann and U. Hartmann
$T_c$ Dependence of Energy Gap and Asymmetry of Coherence Peaks in NdBa$_2$Cu$_3$O$_{7-\delta}$
4 pages, 1 Figure, to appear in Euro Phys. Lett
Euro Phys. Lett. 84, 47004 (2008).
10.1209/0295-5075/84/47004
null
cond-mat.supr-con cond-mat.str-el
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We report here the results of scanning tunneling spectroscopic experiments performed on hole doped NdBa$_2$Cu$_3$O$_{7-\delta}$ single crystals of $T_c$ values of 76 K, 93.5 K and 95.5 K. The energy gaps are observed to be increasing with decreasing $T_c$ values. The coherence peaks are asymmetric with the peaks at the filled states being larger than those at the empty ones. The asymmetry increases with decreasing $T_c$. The observed asymmetry and its $T_c$ dependence can be explained by considering the Mott insulating nature of the material at the undoped state.
[ { "version": "v1", "created": "Wed, 28 Nov 2007 15:06:54 GMT" }, { "version": "v2", "created": "Thu, 29 Nov 2007 09:26:57 GMT" }, { "version": "v3", "created": "Thu, 16 Oct 2008 20:19:35 GMT" } ]
2008-11-08T00:00:00
[ [ "Das", "P.", "" ], [ "Koblischka", "M. R.", "" ], [ "Wolf", "Th.", "" ], [ "Adelmann", "P.", "" ], [ "Hartmann", "U.", "" ] ]
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711.4525
Christian Huck
Christian Huck
Uniqueness in Discrete Tomography of Delone Sets with Long-Range Order
15 pages, 2 figures; condensed and revised version
Discrete Comput. Geom. 42 (2009), 740-758
10.1007/s00454-009-9213-z
null
math.MG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We address the problem of determining finite subsets of Delone sets $\varLambda\subset\R^d$ with long-range order by $X$-rays in prescribed $\varLambda$-directions, i.e., directions parallel to non-zero interpoint vectors of $\varLambda$. Here, an $X$-ray in direction $u$ of a finite set gives the number of points in the set on each line parallel to $u$. For our main result, we introduce the notion of algebraic Delone sets $\varLambda\subset\R^2$ and derive a sufficient condition for the determination of the convex subsets of these sets by $X$-rays in four prescribed $\varLambda$-directions.
[ { "version": "v1", "created": "Wed, 28 Nov 2007 16:06:32 GMT" }, { "version": "v2", "created": "Thu, 20 Nov 2008 15:59:17 GMT" } ]
2013-05-08T00:00:00
[ [ "Huck", "Christian", "" ] ]
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711.4526
Yeong Gyun Kim
Won Sang Cho, Kiwoon Choi, Yeong Gyun Kim, Chan Beom Park
Measuring superparticle masses at hadron collider using the transverse mass kink
Typos corrected. A few references added. Figures updated
JHEP0802:035,2008
10.1088/1126-6708/2008/02/035
null
hep-ph
null
We present a detailed study of the collider observable $m_{T2}$ applied for pair-produced superparticles decaying to visible particles and a pair of invisible lightest supersymmetric particles (LSPs). Analytic expressions of the maximum of $m_{T2}$ over all events ($m_{T2}^{\rm max}$) are derived. It is noticed that if the decay product of each superparticle involves more than one visible particles, $m_{T2}^{\rm max}$ being a function of the {\it trial} LSP mass ${m}_\chi$ has a kink structure at ${m}_\chi=$ true LSP mass, which can be used to determine the mother superparticle mass and the LSP mass simultaneously. To see how well $m_{T2}^{\rm max}$ can be constructed from collider data, a Monte-Carlo analysis of the gluino $m_{T2}$ is performed for some superparticle spectra.
[ { "version": "v1", "created": "Wed, 28 Nov 2007 17:23:33 GMT" }, { "version": "v2", "created": "Tue, 25 Dec 2007 11:33:48 GMT" } ]
2008-11-26T00:00:00
[ [ "Cho", "Won Sang", "" ], [ "Choi", "Kiwoon", "" ], [ "Kim", "Yeong Gyun", "" ], [ "Park", "Chan Beom", "" ] ]
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711.4527
Alexandre Akimenko
A. I. Akimenko and V. A. Gudimenko
Evidence of a s-Wave Pairing in Heavily Zn-doped $YBa_2Cu_3O_{7-\delta}$ from Andreev Reflection Spectra
4 pages, 4 figures
null
10.1063/1.3009579
null
cond-mat.supr-con
null
When the $d_{x^2-y^2}$-wave pairing is suppressed by Zn-doping in $YBa_2Cu_3O_{7-\delta}$ some of the Andreev reflection spectra were found to be similar to the s-wave spectra of conventional superconductors. The energy gap is rather reproducible (2.3-3.0meV). It is suppressed by low magnetic field ($H_C^{PC}=120-270mT$) in great contrast to the d-wave spectra ($H_C^{PC}>3T$) with the similar order of the gap value. We suppose that the s-wave pairing occurs near the Zn-impurities.
[ { "version": "v1", "created": "Wed, 28 Nov 2007 16:20:32 GMT" } ]
2010-09-21T00:00:00
[ [ "Akimenko", "A. I.", "" ], [ "Gudimenko", "V. A.", "" ] ]
[ 0.0896000788, 0.0018327832, -0.0691733658, -0.0220890734, -0.0033307022, 0.1197856888, 0.0438193642, 0.0091250483, -0.049942594, -0.1402602345, -0.0012766696, -0.0259280521, -0.0140044969, 0.0083237654, 0.0406381562, 0.0982587039, -0.0396335647, 0.000438388, -0.0658247247, 0.0702257976, -0.0731438994, -0.0398488343, 0.0050767795, -0.0287265591, 0.0061650882, -0.1075392291, 0.0628109425, 0.0019987202, 0.0812284723, -0.0904611573, 0.0816590115, -0.0601320304, 0.0242417715, -0.0434605815, -0.080797933, 0.0143513205, -0.0268848073, 0.0536261015, -0.141886726, -0.0539609641, -0.0287026409, -0.0482443534, -0.0706563368, -0.0058362037, 0.078932263, 0.0738614649, -0.0863949507, 0.0179750286, 0.0489619225, 0.0201994833, 0.0156548992, 0.0367393792, -0.0081623131, -0.082376577, 0.0043562236, 0.010153559, 0.0463308468, 0.1077305749, -0.0010696219, -0.153941825, 0.0029808888, -0.1000765413, 0.0033725603, 0.0596536547, -0.0128444321, -0.022842519, 0.0223521814, 0.0314772278, 0.1032338291, 0.0586968996, 0.0186686758, -0.0493685417, 0.0944795236, 0.0494642183, 0.0583141968, -0.0433170684, 0.0535782613, 0.0141121317, -0.0033606009, -0.0376243778, -0.0674990416, 0.0477659777, 0.0067989379, 0.0035848403, -0.0092924796, -0.0187523924, 0.0644852668, 0.0100698434, 0.0126769999, -0.0018671666, 0.0142436856, -0.0177238807, -0.0076480578, -0.0137413889, -0.0122464597, -0.0315968245, 0.0402315333, -0.048890166, -0.0365719497, 0.017365098, -0.0382701866, 0.030042097, 0.08252009, 0.0099502485, 0.141886726, 0.0248995405, -0.0447043628, -0.076109834, -0.0966322199, 0.0362131633, 0.1795828491, -0.0537217744, -0.0447761193, 0.0186088793, -0.0719479546, -0.0768752396, -0.017365098, -0.1667623371, -0.0552525818, 0.1271526963, -0.0158223305, 0.0021825966, -0.0034114285, 0.044202067, 0.017891312, -0.0057345484, 0.0194819178, -0.1015116721, -0.0942403376, -0.1064867973, 0.0153439529, -0.0205343477, -0.0940968245, 0.0479812473, -0.0819460377, 0.0763968602, 0.0047777938, -0.0428147726, 0.0657768846, 0.0228664372, 0.0931879058, 0.0220531952, 0.150497511, 0.008945656, 0.0622847304, 0.0855338722, 0.0911308825, 0.0560658239, 0.033940874, 0.0840509012, -0.0318360105, -0.037385188, 0.066255264, -0.0379592441, 0.0696039051, -0.0878300816, 0.0102552148, 0.0430300422, 0.0524779931, -0.0216465741, 0.0799368545, -0.0373612717, 0.0007142024, 0.0067929584, 0.1338499784, -0.0574052818, -0.1404515952, 0.0428386927, -0.0889303461, -0.0805587471, 0.0083177863, 0.0135022001, -0.0156070609, 0.0510428622, 0.0668293163, 0.0473354384, -0.0154994261, -0.0860122442, -0.035519518, -0.0187643506, 0.0364762731, -0.084098734, 0.0098067354, 0.0051246174, -0.0059019807, -0.0641025677, -0.0199363753, 0.0460438207, 0.0059049702, -0.0529563725, -0.0471919253, 0.1137581319, 0.0872560292, -0.0012333166, -0.067738235, -0.1292575598, -0.0065298509, 0.1190202832, 0.0613758117, -0.0916092619, -0.0721393004, -0.034969382, 0.0512342118, 0.0255931877, -0.1201683879, -0.0167790856, 0.0328406058, 0.0006697283, 0.0151765216, -0.1175851524, 0.0085988324, -0.0283438582, 0.1701109856, -0.0678817481, -0.0723306537, -0.0275784545, -0.0652985051, -0.0562571771, -0.0096991006, 0.0263585914, -0.0163007081, -0.0120551093, -0.0362610035, 0.0808936059, -0.0619977042, 0.0685036331, 0.0236796793, -0.0091489665, 0.0444173366, 0.074626863, 0.0410447754, 0.0258323774, 0.0220173169, 0.175373137, -0.0183218531, 0.0396096446, 0.0309749339, 0.0147938197, 0.0457807109, 0.0131912548, -0.1283964813, -0.024445083, 0.0301616918, 0.1375813186, -0.0024920469, 0.1011289731, -0.098163031, 0.0172933415, 0.0507079996, 0.0556831211, -0.0255692694, 0.0188361071, -0.0365719497, 0.0011787517, -0.0333189815, -0.0516647547 ]
711.4528
Juha Vierinen
Markku Markkanen, Juha Vierinen
Polyphase alternating codes
Submitted to Annales Geophysicae
null
10.5194/angeo-26-2237-2008
null
physics.data-an physics.space-ph
null
This work introduces a method for constructing polyphase alternating codes in which the length of a code transmission cycle can be $p^m$ or $p-1$, where $p$ is a prime number and $m$ is a positive integer. The relevant properties leading to the construction alternating codes and the algorithm for generating alternating codes is described. Examples of all practical and some not that practical polyphase code lengths are given.
[ { "version": "v1", "created": "Wed, 28 Nov 2007 16:28:58 GMT" } ]
2015-05-13T00:00:00
[ [ "Markkanen", "Markku", "" ], [ "Vierinen", "Juha", "" ] ]
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711.4529
Hua Liang Chang
Huai-Liang Chang
Donaldson Thomas invariant of P^1 scroll
null
null
null
null
math.AG math.AC
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Let X be a P^1 scroll (a compactification of a line bundle L) over a complex surafce S and assume S has a global two form with zero loci a smooth curve C. The Donaldson Thomas invariants of X is shown to be zero if the curve class has is component on S not a multiple of [C]. For nonzero case, when the prime field insertion are above C, the invariant is shown to depend only on the analytic neighborhood of L in X.
[ { "version": "v1", "created": "Wed, 28 Nov 2007 16:29:11 GMT" }, { "version": "v2", "created": "Tue, 24 Mar 2009 19:20:52 GMT" }, { "version": "v3", "created": "Sat, 28 Mar 2009 14:02:26 GMT" } ]
2009-03-28T00:00:00
[ [ "Chang", "Huai-Liang", "" ] ]
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711.453
Sebastian Volz
S. Gom\`es (CETHIL), Po Chapuis (EM2C), F. Nepveu, N. Trannoy, S. Volz (EM2C), B. Charlot (TIMA), Gilles Tessier (LPEM), S. Dilhaire (CPMOH), Bernard Cretin (FEMTO-ST), Pascal Vairac (FEMTO-ST)
Temperature measurement of sub-micrometric ICs by scanning thermal microscopy
null
IEEE Transactions on Components and Packaging Technologies 30, 3 (2007) 424-431
10.1109/TCAPT.2007.901748
null
physics.class-ph
null
Surface temperature measurements were performed with a Scanning Thermal Microscope mounted with a thermoresistive wire probe of micrometrSurface temperature measurements were performed with a Scanning Thermal Microscope mounted with a thermoresistive wire probe of micrometric size. A CMOS device was designed with arrays of resistive lines 0.35$\mu$m in width. The array periods are 0.8micron and 10micron to study the spatial resolution of the SThM. Integrated Circuits with passivation layers of micrometric and nanometric thicknesses were tested. To enhance signal-to-noise ratio, the resistive lines were heated with an AC current. The passivation layer of nanometric thickness allows us to distinguish the lines when the array period is 10micron. The results raise the difficulties of the SThM measurement due to the design and the topography of ICs on one hand and the size of the thermal probe on the other hand.ic size. A CMOS device was designed with arrays of resistive lines 0.35$\mu$m in width. The array periods are 0.8micron and 10micron to study the spatial resolution of the SThM. Integrated Circuits with passivation layers of micrometric and nanometric thicknesses were tested. To enhance signal-to-noise ratio, the resistive lines were heated with an AC current. The passivation layer of nanometric thickness allows us to distinguish the lines when the array period is 10micron. The results raise the difficulties of the SThM measurement due to the design and the topography of ICs on one hand and the size of the thermal probe on the other hand.
[ { "version": "v1", "created": "Wed, 28 Nov 2007 20:28:38 GMT" } ]
2007-11-29T00:00:00
[ [ "Gomès", "S.", "", "CETHIL" ], [ "Chapuis", "Po", "", "EM2C" ], [ "Nepveu", "F.", "", "EM2C" ], [ "Trannoy", "N.", "", "EM2C" ], [ "Volz", "S.", "", "EM2C" ], [ "Charlot", "B.", "", "TIMA" ], [ "Tessier", "Gilles", "", "LPEM" ], [ "Dilhaire", "S.", "", "CPMOH" ], [ "Cretin", "Bernard", "", "FEMTO-ST" ], [ "Vairac", "Pascal", "", "FEMTO-ST" ] ]
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711.4531
Morley Bell
M.B. Bell
Evidence in Support of the Local Quasar Model from Inner Jet Structure and Angular Motions in Radio Loud AGN
9 pages with 5 figures, submitted to ApJL
null
null
null
astro-ph
null
Radio loud jetted sources with and without extended inner jet structure show good agreement with the simple ballistic ejection scenario proposed in the decreasing intrinsic redshift (DIR) model, where, because of projection effects, those that show the most obvious extended structure and large angular motions are assumed to have jets that lie close to the plane of the sky, and those with little or no structure and small angular motions are assumed to have jets that are coming almost directly towards us. This simple model also predicts several other relations seen in the raw data that, in some cases, may be less easily explained if the redshifts are cosmological and relativistic ejection is required. In particular, for radio-loud sources the source number density is found to be high for sources that are not Doppler boosted but low for highly boosted sources. This is opposite to what is expected, suggesting that Doppler boosting may not be involved at all, which would be in agreement with the DIR model. If so, the reality of relativistic beaming in quasar jets, the assumption of which has been the very foundation of the superluminal motion explanation in the cosmological redshift (CR) model, would then be questioned.
[ { "version": "v1", "created": "Wed, 28 Nov 2007 16:30:33 GMT" }, { "version": "v2", "created": "Wed, 12 Dec 2007 18:18:03 GMT" } ]
2007-12-12T00:00:00
[ [ "Bell", "M. B.", "" ] ]
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711.4532
Yuji Tachikawa
Ofer Aharony and Yuji Tachikawa
A holographic computation of the central charges of d=4, N=2 SCFTs
16 pages; v4: one reference added
JHEP 0801:037,2008
10.1088/1126-6708/2008/01/037
WIS/20/07-NOV-DPP
hep-th
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We use the AdS/CFT correspondence to compute the central charges of the d=4, N=2 superconformal field theories arising from N D3-branes at singularities in F-theory. These include the conformal theories with E_n global symmetries. We compute the central charges a and c related to the conformal anomaly, and also the central charges k associated to the global symmetry in these theories. All of these are related to the coefficients of Chern-Simons terms in the dual string theory on AdS_5. Our computation is exact for all values of N, enabling several tests of the dualities recently proposed by Argyres and Seiberg for the E_6 and E_7 theories with N=1.
[ { "version": "v1", "created": "Wed, 28 Nov 2007 16:35:58 GMT" }, { "version": "v2", "created": "Wed, 5 Dec 2007 19:36:08 GMT" }, { "version": "v3", "created": "Mon, 10 Mar 2008 18:03:36 GMT" }, { "version": "v4", "created": "Fri, 8 Aug 2008 14:38:44 GMT" } ]
2009-09-29T00:00:00
[ [ "Aharony", "Ofer", "" ], [ "Tachikawa", "Yuji", "" ] ]
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711.4533
Stefano Piscanec
V. Scardaci, S. Piscanec, Michele Lazzeri, R. Krupke, Francesco Mauri, A.C. Ferrari
Temperature dependent phonon renormalization in metallic nanotubes
5 pages, 3 figures
null
null
null
cond-mat.mtrl-sci
null
We measure the temperature dependence of the Raman spectra of metallic and semiconducting nanotubes. We show that the different trend in metallic tubes is due to phonon re-normalization induced by the variation in electronic temperature, which is modeled including non-adiabatic contributions to account for the dynamic, time dependent nature
[ { "version": "v1", "created": "Wed, 28 Nov 2007 16:46:18 GMT" } ]
2007-11-29T00:00:00
[ [ "Scardaci", "V.", "" ], [ "Piscanec", "S.", "" ], [ "Lazzeri", "Michele", "" ], [ "Krupke", "R.", "" ], [ "Mauri", "Francesco", "" ], [ "Ferrari", "A. C.", "" ] ]
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711.4534
Jaromir Fiurasek
A. Cernoch, J. Soubusta, L. Bartuskova, M. Dusek, J. Fiurasek
Experimental realization of linear-optical partial SWAP gates
4 pages, 4 figures, RevTeX4
Phys. Rev. Lett. 100, 180501 (2008).
10.1103/PhysRevLett.100.180501
null
quant-ph
null
We present a linear-optical implementation of a class of two-qubit partial SWAP gates for polarization states of photons. Different gate operations, including the SWAP and entangling square root of SWAP, can be obtained by changing a classical control parameter -- namely the path difference in the interferometer. Reconstruction of output states, full process tomography and evaluation of entanglement of formation prove very good performance of the gates.
[ { "version": "v1", "created": "Wed, 28 Nov 2007 16:38:33 GMT" } ]
2009-11-13T00:00:00
[ [ "Cernoch", "A.", "" ], [ "Soubusta", "J.", "" ], [ "Bartuskova", "L.", "" ], [ "Dusek", "M.", "" ], [ "Fiurasek", "J.", "" ] ]
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711.4535
Bernhard Urbaszek
D. Lagarde, A. Balocchi, H. Carrere, P. Renucci, T. Amand, X. Marie, S. Founta, H. Mariette
Room temperature Optical Orientation of Exciton Spin in cubic GaN/AlN quantum dots
null
null
10.1103/PhysRevB.77.041304
null
cond-mat.other cond-mat.mtrl-sci
null
The optical orientation of the exciton spin in an ensemble of self-organized cubic GaN/AlN quantum dots is studied by time-resolved photoluminescence. Under a polarized quasi-resonant excitation, the luminescence linear polarization exhibits no temporal decay, even at room temperature. This demonstrates the robustness of the exciton spin polarization in these cubic nitride nanostructures, with characteristic decay times longer than 10 ns.
[ { "version": "v1", "created": "Wed, 28 Nov 2007 16:43:56 GMT" } ]
2009-11-13T00:00:00
[ [ "Lagarde", "D.", "" ], [ "Balocchi", "A.", "" ], [ "Carrere", "H.", "" ], [ "Renucci", "P.", "" ], [ "Amand", "T.", "" ], [ "Marie", "X.", "" ], [ "Founta", "S.", "" ], [ "Mariette", "H.", "" ] ]
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711.4536
Mikhail Kozlov
V. V. Flambaum and M. G. Kozlov
Studying variation of fundamental constants with molecules
14 pages, 2 figures, RevTeX4; v2: one section and 10 new references added
Chapter in book "Cold Molecules: Theory, Experiment, Applications", Edited by R V Krems, W C Stwalley, and B Friedrich, CRC Press, 2009
null
null
physics.atom-ph
null
This review article is devoted to application of precision molecular spectroscopy to studies of the possible spatial and temporal variations of the fundamental constants. Both astrophysical observations and laboratory experiments are discussed.
[ { "version": "v1", "created": "Wed, 28 Nov 2007 17:02:36 GMT" }, { "version": "v2", "created": "Wed, 30 Jan 2008 08:14:54 GMT" } ]
2009-07-18T00:00:00
[ [ "Flambaum", "V. V.", "" ], [ "Kozlov", "M. G.", "" ] ]
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711.4537
Martin Sieber
Jack Kuipers and Martin Sieber
The semiclassical relation between open trajectories and periodic orbits for the Wigner time delay
21 pages, 5 figures
Phys. Rev. E 77 (2008) 046219
10.1103/PhysRevE.77.046219
null
nlin.CD cond-mat.mes-hall
null
The Wigner time delay of a classically chaotic quantum system can be expressed semiclassically either in terms of pairs of scattering trajectories that enter and leave the system or in terms of the periodic orbits trapped inside the system. We show how these two pictures are related on the semiclassical level. We start from the semiclassical formula with the scattering trajectories and derive from it all terms in the periodic orbit formula for the time delay. The main ingredient in this calculation is a new type of correlation between scattering trajectories which is due to trajectories that approach the trapped periodic orbits closely. The equivalence between the two pictures is also demonstrated by considering correlation functions of the time delay. A corresponding calculation for the conductance gives no periodic orbit contributions in leading order.
[ { "version": "v1", "created": "Wed, 28 Nov 2007 17:03:40 GMT" } ]
2010-03-09T00:00:00
[ [ "Kuipers", "Jack", "" ], [ "Sieber", "Martin", "" ] ]
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711.4538
Angelo Bassi Dr.
A. Bassi, G.C. Ghirardi
On a recent proposal of faster than light quantum communication
9 pages, LaTeX. Minor changes made
Int. Journ. Theor. Phys. 47, 2500 (2008).
10.1007/s10773-008-9683-4
null
quant-ph
null
In a recent paper, A.Y. Shiekh has discussed an experimental set-up which, in his opinion, should make possible faster-than-light communication using the collapse of the quantum wave function. Contrary to the many proposals which have been presented in the past, he does not resort to an entangled state of two systems but he works with a single particle in a superposition of two states - corresponding to its propagation in opposite directions - one of which goes through an appropriate interferometer. The possibility for an observer near the interferometer to introduce or not, at his free will, a phase shifter along one of the paths should allow to change instantaneously the probability of finding the particle in the far-away region corresponding to the other state of the superposition and, correspondingly, to change the intensity of a beam of particles reaching a distant observer. In this paper we show a flaw in the argument: once more, as it has been proved in full generality a long time ago, the process of wave packet reduction cannot be used for superluminal communication.
[ { "version": "v1", "created": "Wed, 28 Nov 2007 17:08:06 GMT" }, { "version": "v2", "created": "Fri, 22 Feb 2008 18:56:43 GMT" }, { "version": "v3", "created": "Thu, 20 Mar 2008 13:17:55 GMT" } ]
2009-11-13T00:00:00
[ [ "Bassi", "A.", "" ], [ "Ghirardi", "G. C.", "" ] ]
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711.4539
Alberto Saa
Roberto Venegeroles and Alberto Saa
Non-Gaussian features of chaotic Hamiltonian transport
19 pages, 6 Figures. v2: Grammatical corrections, new references
J. Stat. Mech. (2008) P01005
10.1088/1742-5468/2008/01/P01005
null
nlin.CD
null
Some non-Gaussian aspects of chaotic transport are investigated for a general class of two-dimensional area-preserving maps. Kurtosis, in particular, is calculated from the diffusion and the Burnett coefficients, which are obtained analytically. A characteristic time scale delimiting the onset of the Markovian regime for the master equation is established. Some explicit examples are discussed.
[ { "version": "v1", "created": "Wed, 28 Nov 2007 17:12:30 GMT" }, { "version": "v2", "created": "Thu, 29 Nov 2007 11:22:28 GMT" }, { "version": "v3", "created": "Mon, 10 Dec 2007 00:54:02 GMT" } ]
2008-01-03T00:00:00
[ [ "Venegeroles", "Roberto", "" ], [ "Saa", "Alberto", "" ] ]
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711.454
Nicola Coppola
N. Coppola (for the H1 Collaboration and ZEUS Collaboration)
High p_T jets in DIS and gamma p at HERA
4 pages, 5 figures, submitted to proceedings ISMD2007; revised version (few comments, typos corrected)
Acta Phys.Polon.Supp.1:475-478,2008
null
null
hep-ex
null
Recent results on di-jet, inclusive jets, production at high p_T in Deep Inelastic Scattering DIS and photoproduction gamma p regimes using both the H1 and ZEUS detectors at HERA are presented. Also studies of integrated jet shape and jet radius dependencies in DIS performed by the ZEUS Collaborations are discussed. All the measurements are found to be well described by calculations at the next-to-leading order in perturbative QCD. A combined determination of the value of the strong coupling constant alpha_s(M_Z) from the H1 and ZEUS Collaborations using inclusive-jet cross-section measurements in neutral current DIS at high Q^2 is shown.
[ { "version": "v1", "created": "Wed, 28 Nov 2007 17:12:58 GMT" }, { "version": "v2", "created": "Fri, 30 Nov 2007 12:31:43 GMT" } ]
2019-08-14T00:00:00
[ [ "Coppola", "N.", "", "for the H1 Collaboration and ZEUS Collaboration" ] ]
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711.4541
Shahar Hod
Shahar Hod
Einstein-Yang-Mills Solitons: The Role of Gravity
6 pages
Phys.Lett.B657:255-256,2007
10.1016/j.physletb.2007.10.015
null
hep-th astro-ph gr-qc
null
The canonical Bartnik-McKinnon solitons are regular solutions of the coupled Einstein-Yang-Mills system in which gravity may balance the repulsive nature of the Yang-Mills field. We examine the role played by gravity in balancing the system and determine its strength. In particular, we obtain an analytic lower bound on the fundamental mass-to-radius ratio, max{2m(r)/r}>2/3, which is a necessary condition for the existence of globally regular Einstein-Yang-Mills solitons. Our analytical results are in accord with numerical calculations.
[ { "version": "v1", "created": "Wed, 28 Nov 2007 17:17:08 GMT" } ]
2008-11-26T00:00:00
[ [ "Hod", "Shahar", "" ] ]
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711.4542
Torsten B\"oker
Torsten Boeker
Are Globular Clusters the Remnant Nuclei of Progenitor Disk Galaxies?
5 pages, no figures. Accepted by ApJ Letters
null
10.1086/527033
null
astro-ph
null
The globular cluster system of a typical spheroidal galaxy makes up about 0.25% of the total galaxy mass (McLaughlin 1999). This is roughly the same mass fraction as contained in the nuclear star clus- ter (or stellar nucleus) present in most nearby low-mass galaxies. Motivated by this "coincidence", this Letter discusses a scenario in which globular clusters of present-day galaxies are the surviving nuclei of the dwarf galaxies that - according to the hierarchical merging paradigm of galaxy forma- tion - constitute the "building blocks" of present-day massive galaxies. This scenario, which was first suggested by Freeman (1993), has become more attractive recently in the light of studies that demonstrate a complex star formation history in a number of massive globular clusters.
[ { "version": "v1", "created": "Wed, 28 Nov 2007 17:31:04 GMT" } ]
2009-11-13T00:00:00
[ [ "Boeker", "Torsten", "" ] ]
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711.4543
Jan Budaj
I. Iliev, J. Budaj
Am stars in binary systems
6 pages, 0 figures, submitted to Contrib. Astron. Obs. Skalnate Pleso (Proceedings from the International workshop CP#Ap 2007, Vienna, Sep. 10-14, 2007, eds. J. Ziznovsky, J. Zverko, E. Pauntzen, M. Netopil)
null
null
null
astro-ph
null
It is argued that apart from the well known dependence of the Am phenomenon on the mass, age (effective temperature, gravity) and rotation there is also a complex dependence on the orbital parameters in binary systems. This is why the generally accepted scenario in which the Am star rotation plays a unique role needs to be revisited, the strong correlations between the rotation, orbital period and eccentricity need to be properly addressed and tidal effects taken into account. Recent observations of Am stars in binary systems are reviewed.
[ { "version": "v1", "created": "Wed, 28 Nov 2007 17:37:19 GMT" } ]
2007-11-29T00:00:00
[ [ "Iliev", "I.", "" ], [ "Budaj", "J.", "" ] ]
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711.4544
Yogiro Hama
Yogiro Hama, Rone Peterson G. Andrade, Fr\'ed\'erique Grassi, Wei-Liang Qian, Takeshi Osada, Carlos Eduardo Aguiar, Takeshi Kodama
NeXSPheRIO Results on Elliptic-Flow Fluctuations at RHIC
12 pages, 6 figures, prepared for the Workshop "Relativistic Nuclear Physics: from Nuclotron to LHC Energies", June 18-22, 2007 (BITP, Kiev, Ukraine)
Phys.Atom.Nucl.71:1558-1564,2008
10.1134/S106377880809010X
null
hep-ph
null
By using the NexSPheRIO code, we study the elliptic-flow fluctuations in Au+Au collisions at 200A GeV. It is shown that, by fixing the parameters of the model to correctly reproduce the charged pseudo-rapidity and the transverse-momentum distributions, reasonable agreement of <v_2> with data is obtained, both as function of pseudo-rapidity as well as of transverse momentum, for charged particles. Our results on elliptic-flow fluctuations are in good agreement with the recently measured data in experiments.
[ { "version": "v1", "created": "Wed, 28 Nov 2007 17:38:49 GMT" } ]
2008-11-26T00:00:00
[ [ "Hama", "Yogiro", "" ], [ "Andrade", "Rone Peterson G.", "" ], [ "Grassi", "Frédérique", "" ], [ "Qian", "Wei-Liang", "" ], [ "Osada", "Takeshi", "" ], [ "Aguiar", "Carlos Eduardo", "" ], [ "Kodama", "Takeshi", "" ] ]
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711.4545
Sylvain Brochard
Sylvain Brochard
Foncteur de Picard d'un champ alg\'ebrique
null
Math. Ann. Volume 343, Number 3 / mars 2009, pages 541-602.
10.1007/s00208-008-0282-8
null
math.AG
null
In this article we study the Picard functor and the Picard stack of an algebraic stack. We give a new and direct proof of the representability of the Picard stack. We prove that it is quasi-separated, and that the connected component of the identity is proper when the fibers of the stack are geometrically normal. We study some examples of Picard functors of classical stacks. In an appendix, we review the lisse-etale cohomology of abelian sheaves on an algebraic stack.
[ { "version": "v1", "created": "Wed, 28 Nov 2007 18:58:12 GMT" } ]
2009-09-18T00:00:00
[ [ "Brochard", "Sylvain", "" ] ]
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711.4546
A. Tureanu
M. Chaichian, M. R. Setare, A. Tureanu, G. Zet
On Black Holes and Cosmological Constant in Noncommutative Gauge Theory of Gravity
Based on a talk given at the International Conference on Fundamental and Applied Research in Physics "Farphys 2007", 25-28 October 2007, Iasi, Romania
JHEP0804:064,2008
10.1088/1126-6708/2008/04/064
null
hep-th gr-qc
null
Deformed Reissner-Nordstr\"om, as well as Reissner-Nordstr\"om de Sitter, solutions are obtained in a noncommutative gauge theory of gravitation. The gauge potentials (tetrad fields) and the components of deformed metric are calculated to second order in the noncommutativity parameter. The solutions reduce to the deformed Schwarzschild ones when the electric charge of the gravitational source and the cosmological constant vanish. Corrections to the thermodynamical quantities of the corresponding black holes and to the radii of different horizons have been determined. All the independent invariants, such as the Ricci scalar and the so-called Kretschmann scalar, have the same singularity structure as the ones of the usual undeformed case and no smearing of singularities occurs. The possibility of such a smearing is discussed. In the noncommutative case we have a local disturbance of the geometry around the source, although asymptotically at large distances it becomes flat.
[ { "version": "v1", "created": "Wed, 28 Nov 2007 17:48:55 GMT" } ]
2008-11-26T00:00:00
[ [ "Chaichian", "M.", "" ], [ "Setare", "M. R.", "" ], [ "Tureanu", "A.", "" ], [ "Zet", "G.", "" ] ]
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711.4547
Alessio Marrani
S. Bellucci, S. Ferrara, R. Kallosh, A. Marrani
Extremal Black Hole and Flux Vacua Attractors
1+74 pages, 2 Tables. Contribution to the Proceedings of the Winter School on Attractor Mechanism 2006 (SAM2006), 20-24 March 2006, INFN-LNF, Frascati, Italy
Lect.NotesPhys.755:115-191,2008
null
CERN-PH-TH/182; UCLA/07/TEP/22; SU-ITP-2007-21
hep-th
null
These lectures provide a pedagogical, introductory review of the so-called Attractor Mechanism (AM) at work in two different 4-dimensional frameworks: extremal black holes in N=2 supergravity and N=1 flux compactifications. In the first case, AM determines the stabilization of scalars at the black hole event horizon purely in terms of the electric and magnetic charges, whereas in the second context the AM is responsible for the stabilization of the universal axion-dilaton and of the (complex structure) moduli purely in terms of the RR and NSNS fluxes. Two equivalent approaches to AM, namely the so-called ``criticality conditions'' and ``New Attractor'' ones, are analyzed in detail in both frameworks, whose analogies and differences are discussed. Also a stringy analysis of both frameworks (relying on Hodge-decomposition techniques) is performed, respectively considering Type IIB compactified on $CY_{3}$ and its orientifolded version, associated with $\frac{CY_{3}\times T^{2}}{\mathbb{Z}_{2}}$. Finally, recent results on the U-duality orbits and moduli spaces of non-BPS extremal black hole attractors in $3\leqslant N\leqslant 8$, d=4 supergravities are reported.
[ { "version": "v1", "created": "Wed, 28 Nov 2007 17:49:18 GMT" } ]
2008-12-18T00:00:00
[ [ "Bellucci", "S.", "" ], [ "Ferrara", "S.", "" ], [ "Kallosh", "R.", "" ], [ "Marrani", "A.", "" ] ]
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711.4548
Stefan Taubenberger
S. Taubenberger, S. Hachinger, G. Pignata, P. A. Mazzali, C. Contreras, S. Valenti, A. Pastorello, N. Elias-Rosa, O. B\"arnbantner, H. Barwig, S. Benetti, M. Dolci, J. Fliri, G. Folatelli, W. L. Freedman, S. Gonzalez, M. Hamuy, W. Krzeminski, N. Morrell, H. Navasardyan, S. E. Persson, M. M. Phillips, C. Ries, M. Roth, N. B. Suntzeff, M. Turatto and W. Hillebrandt
The underluminous Type Ia Supernova 2005bl and the class of objects similar to SN 1991bg
24 pages, 24 figures, accepted for publication in MNRAS
null
10.1111/j.1365-2966.2008.12843.x
null
astro-ph
null
Optical observations of the Type Ia supernova (SN Ia) 2005bl in NGC 4070, obtained from -6 to +66 d with respect to the B-band maximum, are presented. The photometric evolution is characterised by rapidly-declining light curves and red colours at peak and soon thereafter. With M_B,max = -17.24 the SN is an underluminous SN Ia, similar to the peculiar SNe 1991bg and 1999by. This similarity also holds for the spectroscopic appearance, the only remarkable difference being the likely presence of carbon in pre-maximum spectra of SN 2005bl. A comparison study among underluminous SNe Ia is performed, based on a number of spectrophotometric parameters. Previously reported correlations of the light-curve decline rate with peak luminosity and R(Si) are confirmed, and a large range of post-maximum Si II lambda6355 velocity gradients is encountered. 1D synthetic spectra for SN 2005bl are presented, which confirm the presence of carbon and suggest an overall low burning efficiency with a significant amount of leftover unburned material. Also, the Fe content in pre-maximum spectra is very low, which may point to a low metallicity of the precursor. Implications for possible progenitor scenarios of underluminous SNe Ia are briefly discussed.
[ { "version": "v1", "created": "Wed, 28 Nov 2007 18:32:07 GMT" } ]
2009-11-13T00:00:00
[ [ "Taubenberger", "S.", "" ], [ "Hachinger", "S.", "" ], [ "Pignata", "G.", "" ], [ "Mazzali", "P. A.", "" ], [ "Contreras", "C.", "" ], [ "Valenti", "S.", "" ], [ "Pastorello", "A.", "" ], [ "Elias-Rosa", "N.", "" ], [ "Bärnbantner", "O.", "" ], [ "Barwig", "H.", "" ], [ "Benetti", "S.", "" ], [ "Dolci", "M.", "" ], [ "Fliri", "J.", "" ], [ "Folatelli", "G.", "" ], [ "Freedman", "W. L.", "" ], [ "Gonzalez", "S.", "" ], [ "Hamuy", "M.", "" ], [ "Krzeminski", "W.", "" ], [ "Morrell", "N.", "" ], [ "Navasardyan", "H.", "" ], [ "Persson", "S. E.", "" ], [ "Phillips", "M. M.", "" ], [ "Ries", "C.", "" ], [ "Roth", "M.", "" ], [ "Suntzeff", "N. B.", "" ], [ "Turatto", "M.", "" ], [ "Hillebrandt", "W.", "" ] ]
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711.4549
Dariusz Lis
D.C. Lis, D. Bockelee-Morvan, J. Boissier, J. Crovisier, N. Biver, and S.B. Charnley
Hydrogen Isocyanide in Comet 73P/Schwassmann-Wachmann (Fragment B)
6 pages, 5 figures, 2 tables
null
10.1086/527345
null
astro-ph
null
We present a sensitive 3-sigma upper limit of 1.1% for the HNC/HCN abundance ratio in comet 73P/Schwassmann-Wachmann (Fragment B), obtained on May 10-11, 2006 using Caltech Submillimeter Observatory (CSO). This limit is a factor of ~7 lower than the values measured previously in moderately active comets at 1 AU from the Sun. Comet 73P/Schwassmann-Wachmann was depleted in most volatile species, except of HCN. The low HNC/HCN ratio thus argues against HNC production from polymers produced from HCN. However, thermal degradation of macromolecules, or polymers, produced from ammonia and carbon compounds, such as acetylene, methane, or ethane appears a plausible explanation for the observed variations of the HNC/HCN ratio in moderately active comets, including the very low ratio in comet 73P/Schwassmann-Wachmann reported here. Similar polymers have been invoked previously to explain anomalous 14N/15N ratios measured in cometary CN.
[ { "version": "v1", "created": "Wed, 28 Nov 2007 18:04:46 GMT" } ]
2009-11-13T00:00:00
[ [ "Lis", "D. C.", "" ], [ "Bockelee-Morvan", "D.", "" ], [ "Boissier", "J.", "" ], [ "Crovisier", "J.", "" ], [ "Biver", "N.", "" ], [ "Charnley", "S. B.", "" ] ]
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711.455
George Svetlichny
George Svetlichny
Equivariance, Variational Principles, and the Feynman Integral
This is a contribution to the Proc. of the Seventh International Conference ''Symmetry in Nonlinear Mathematical Physics'' (June 24-30, 2007, Kyiv, Ukraine), published in SIGMA (Symmetry, Integrability and Geometry: Methods and Applications) at http://www.emis.de/journals/SIGMA/
SIGMA 4 (2008), 032, 13 pages
10.3842/SIGMA.2008.032
null
math-ph math.MP
null
We argue that the variational calculus leading to Euler's equations and Noether's theorem can be replaced by equivariance and invariance conditions avoiding the action integral. We also speculate about the origin of Lagrangian theories in physics and their connection to Feynman's integral.
[ { "version": "v1", "created": "Wed, 28 Nov 2007 18:02:30 GMT" }, { "version": "v2", "created": "Wed, 19 Mar 2008 07:54:13 GMT" } ]
2008-04-25T00:00:00
[ [ "Svetlichny", "George", "" ] ]
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711.4551
Rajamani Narayanan
R. Narayanan, H. Neuberger
Universality of large N phase transitions in Wilson loop operators in two and three dimensions
43 pages, 1 table, 18 figures, uses JHEP3.cls, one reference added, replaced Figure 3 and a small change to eqn (4.8)
JHEP 0712:066,2007
10.1088/1126-6708/2007/12/066
null
hep-th hep-lat
null
The eigenvalue distribution of a Wilson loop operator of fixed shape undergoes a transition under scaling at infinite N. We derive a large N scaling function in a double scaling limit of the average characteristic polynomial associated with the Wilson loop operator in two dimensional QCD. We hypothesize that the transition in three and four dimensional large N QCD are also in the same universality class and provide a numerical test for our hypothesis in three dimensions.
[ { "version": "v1", "created": "Wed, 28 Nov 2007 18:10:10 GMT" }, { "version": "v2", "created": "Fri, 7 Dec 2007 19:34:51 GMT" }, { "version": "v3", "created": "Sun, 9 Dec 2007 10:14:23 GMT" } ]
2009-12-15T00:00:00
[ [ "Narayanan", "R.", "" ], [ "Neuberger", "H.", "" ] ]
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711.4552
Oren Zarchin
O. Zarchin, M. Zaffalon, M. Heiblum, D. Mahalu, and V. Umansky
Two-electron bunching in transport through a QD induced by Kondo correlations
null
null
10.1103/PhysRevB.77.241303
null
cond-mat.mes-hall
null
We report on noise measurements in a quantum dot in the presence of Kondo correlations. Close to the unitary limit, with the conductance reaching 1.8e2/h, we observed an average backscattered charge of e*~5e/3, while weakly biasing the quantum dot. This result held to bias voltages up to half the Kondo temperature. Away from the unitary limit, the charge was measured to be e as expected. These results confirm and extend the prediction by E. Sela et al. [1], that suggested that two-electron backscattering processes dominate over single-electron backscattering processes near the unitary limit, with an average backscattered charge e*~5e/3.
[ { "version": "v1", "created": "Wed, 28 Nov 2007 18:14:04 GMT" } ]
2009-11-13T00:00:00
[ [ "Zarchin", "O.", "" ], [ "Zaffalon", "M.", "" ], [ "Heiblum", "M.", "" ], [ "Mahalu", "D.", "" ], [ "Umansky", "V.", "" ] ]
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711.4553
Markus Schmidt
Markus A. Schmidt, Luis N. Prill Sempere, Hemant K. Tyagi, Chris G. Poulton, and Philip St.J. Russell
Waveguiding and Plasmon Resonances in Two-Dimensional Photonic Lattices of Gold and Silver Nanowires
4 pages, 4 figures
null
10.1103/PhysRevB.77.033417
null
physics.optics
null
We report the fabrication of triangular lattices of parallel gold and silver nanowires of high optical quality, with diameters down to 500 nm and length-to-diameter ratios as high as 100,000. The nanowires are supported by a silica glass matrix and are disposed around a central solid glass core, i.e., a missing nanowire. These cm-long structures make it possible to trap light within an array of nanowires and characterize the plasmon resonances that form at specific optical frequencies. Such nanowire arrays have many potential applications, e.g., to imaging on the sub-wavelength scale.
[ { "version": "v1", "created": "Wed, 28 Nov 2007 18:15:10 GMT" } ]
2009-11-13T00:00:00
[ [ "Schmidt", "Markus A.", "" ], [ "Sempere", "Luis N. Prill", "" ], [ "Tyagi", "Hemant K.", "" ], [ "Poulton", "Chris G.", "" ], [ "Russell", "Philip St. J.", "" ] ]
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711.4554
Diana Lopez Nacir
Diana L\'opez Nacir and Francisco D. Mazzitelli
New counterterms induced by trans-Planckian physics in semiclassical gravity
null
Phys.Rev.D78:044001,2008
10.1103/PhysRevD.78.044001
null
gr-qc hep-th
null
We consider free and self-interacting quantum scalar fields satisfying modified dispersion relations in the framework of Einstein-Aether theory. Using adiabatic regularization, we study the renormalization of the equation for the mean value of the field in the self-interacting case, and the renormalization of the semiclassical Einstein-Aether equations for free fields. In both cases we consider Bianchi type I background spacetimes. Contrary to what happens for {\it free} fields in {\it flat} Robertson-Walker spacetimes, the self-interaction and/or the anisotropy produce non-purely geometric terms in the adiabatic expansion, i.e terms that involve both the metric $g_{\mu\nu}$ and the aether field $u_{\mu}$. We argue that, in a general spacetime, the renormalization of the theory would involve new counterterms constructed with $g_{\mu\nu}$ and $u_{\mu}$, generating a fine-tuning problem for the Einstein-Aether theory.
[ { "version": "v1", "created": "Wed, 28 Nov 2007 18:16:56 GMT" } ]
2008-11-26T00:00:00
[ [ "Nacir", "Diana López", "" ], [ "Mazzitelli", "Francisco D.", "" ] ]
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711.4555
John Lafferty
Pradeep Ravikumar, John Lafferty, Han Liu, Larry Wasserman
Sparse Additive Models
null
null
null
null
math.ST stat.TH
null
We present a new class of methods for high-dimensional nonparametric regression and classification called sparse additive models (SpAM). Our methods combine ideas from sparse linear modeling and additive nonparametric regression. We derive an algorithm for fitting the models that is practical and effective even when the number of covariates is larger than the sample size. SpAM is closely related to the COSSO model of Lin and Zhang (2006), but decouples smoothing and sparsity, enabling the use of arbitrary nonparametric smoothers. An analysis of the theoretical properties of SpAM is given. We also study a greedy estimator that is a nonparametric version of forward stepwise regression. Empirical results on synthetic and real data are presented, showing that SpAM can be effective in fitting sparse nonparametric models in high dimensional data.
[ { "version": "v1", "created": "Wed, 28 Nov 2007 18:28:59 GMT" }, { "version": "v2", "created": "Wed, 9 Apr 2008 03:58:42 GMT" } ]
2008-04-09T00:00:00
[ [ "Ravikumar", "Pradeep", "" ], [ "Lafferty", "John", "" ], [ "Liu", "Han", "" ], [ "Wasserman", "Larry", "" ] ]
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711.4556
Mikhail Voloshin
M.B. Voloshin
Charmonium
67 pages, 10 figures, To be published in Prog. Part. Nucl. Phys
Prog.Part.Nucl.Phys.61:455-511,2008
10.1016/j.ppnp.2008.02.001
FTPI-MINN-07/34, UMN-TH-2625/07
hep-ph
null
Topics in the description of the properties of charmonium states are reviewed with an emphasis on specific theoretical ideas and methods of relating those properties to the underlying theory of Quantum Chromodynamics.
[ { "version": "v1", "created": "Wed, 28 Nov 2007 18:33:44 GMT" }, { "version": "v2", "created": "Wed, 12 Dec 2007 20:34:14 GMT" }, { "version": "v3", "created": "Wed, 30 Jan 2008 19:51:08 GMT" } ]
2008-12-18T00:00:00
[ [ "Voloshin", "M. B.", "" ] ]
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711.4557
Wenyi Zhang
Wenyi Zhang and Urbashi Mitra
On Outage Behavior of Wideband Slow-Fading Channels
Submitted to IEEE Transactions on Information Theory
null
null
USC CSI Technical Report CSI 07-08-01
cs.IT math.IT
null
This paper investigates point-to-point information transmission over a wideband slow-fading channel, modeled as an (asymptotically) large number of independent identically distributed parallel channels, with the random channel fading realizations remaining constant over the entire coding block. On the one hand, in the wideband limit the minimum achievable energy per nat required for reliable transmission, as a random variable, converges in probability to certain deterministic quantity. On the other hand, the exponential decay rate of the outage probability, termed as the wideband outage exponent, characterizes how the number of parallel channels, {\it i.e.}, the ``bandwidth'', should asymptotically scale in order to achieve a target outage probability at a target energy per nat. We examine two scenarios: when the transmitter has no channel state information and adopts uniform transmit power allocation among parallel channels; and when the transmitter is endowed with an one-bit channel state feedback for each parallel channel and accordingly allocates its transmit power. For both scenarios, we evaluate the wideband minimum energy per nat and the wideband outage exponent, and discuss their implication for system performance.
[ { "version": "v1", "created": "Wed, 28 Nov 2007 18:38:13 GMT" } ]
2007-11-29T00:00:00
[ [ "Zhang", "Wenyi", "" ], [ "Mitra", "Urbashi", "" ] ]
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711.4558
Enrico Barausse
E. Barausse (SISSA, Italy) and L. Rezzolla (AEI, Germany)
The influence of the hydrodynamic drag from an accretion torus on extreme mass-ratio inspirals
21 pages, 8 figures. Phys. Rev. D, in press. Typos fixed and minor changes; added discussion on the gravitational pull exerted by the torus
Phys.Rev.D77:104027,2008
10.1103/PhysRevD.77.104027
null
gr-qc astro-ph
null
We have studied extreme mass-ratio inspirals (EMRIs) in spacetimes containing a rotating black hole and a non self-gravitating torus with constant specific angular momentum. We have found that the effect of the hydrodynamic drag exerted by the torus on the satellite is much smaller than the corresponding one due to radiation reaction, for systems such as those generically expected in AGNs and at distances from the SMBH which can be probed with LISA. However, given the uncertainty on the parameters of these systems, there exist configurations in which the effect of the hydrodynamic drag can be comparable to the radiation-reaction one in phases of the inspiral which are detectable by LISA. This is the case, for instance, for a 10^6 M_sun SMBH surrounded by a corotating torus of comparable mass and with radius of 10^3-10^4 gravitational radii, or for a 10^5 M_sun SMBH surrounded by a corotating 10^4 M_sun torus with radius of 10^5 gravitational radii. Should these conditions be met in astrophysical systems, EMRI-gravitational waves could provide a characteristic signature of the presence of the torus. In fact, while radiation reaction always increases the inclination of the orbit with respect to the equatorial plane, the hydrodynamic drag from a torus corotating with the SMBH always decreases it. However, even when initially dominating over radiation reaction, the influence of the hydrodynamic drag decays very rapidly as the satellite moves into the very strong-field region of the SMBH (i.e., p <~ 5M). Although our results have been obtained for a specific class of tori, we argue that they will be qualitatively valid also for more generic distributions of the specific angular momentum.
[ { "version": "v1", "created": "Wed, 28 Nov 2007 18:55:08 GMT" }, { "version": "v2", "created": "Wed, 28 Nov 2007 22:07:50 GMT" }, { "version": "v3", "created": "Fri, 16 May 2008 12:21:39 GMT" } ]
2008-11-26T00:00:00
[ [ "Barausse", "E.", "", "SISSA, Italy" ], [ "Rezzolla", "L.", "", "AEI, Germany" ] ]
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711.4559
Kurasov Victor
Victor Kurasov
Theoretical description of nucleation in multicomponent system
LATEX, 91 p
null
null
null
cond-mat.stat-mech
null
The full theoretical analysis of the kinetics of multicomponent nucleation is presented. The relief of the free energy with surface excesses was analyzed, the valleys and ridges were described, their mutual interaction was studied. The new possibility to change the valley of nucleation is shown. The possibility to have one common valley instead of several neighbor ones which leads to the radical change in the height of the effective activation barrier and to the new value for the nucleation rate.
[ { "version": "v1", "created": "Wed, 28 Nov 2007 19:10:25 GMT" } ]
2007-11-29T00:00:00
[ [ "Kurasov", "Victor", "" ] ]
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711.456
Christian Heiliger
Christian Heiliger and M. D. Stiles
Ab initio studies of the spin-transfer torque in tunnel junctions
5 pages, 4 figures
null
10.1103/PhysRevLett.100.186805
null
cond-mat.mes-hall cond-mat.mtrl-sci
null
We calculate the spin-transfer torque in Fe/MgO/Fe tunnel junctions and compare the results to those for all-metallic junctions. We show that the spin-transfer torque is interfacial in the ferromagnetic layer to a greater degree than in all-metallic junctions. This result originates in the half metallic behavior of Fe for the $\Delta_1$ states at the Brillouin zone center; in contrast to all-metallic structures, dephasing does not play an important role. We further show that it is possible to get a component of the torque that is out of the plane of the magnetizations and that is linear in the bias. However, observation of such a torque requires highly ideal samples. In samples with typical interfacial roughness, the torque is similar to that in all-metallic multilayers, although for different reasons.
[ { "version": "v1", "created": "Wed, 28 Nov 2007 19:14:07 GMT" } ]
2009-11-13T00:00:00
[ [ "Heiliger", "Christian", "" ], [ "Stiles", "M. D.", "" ] ]
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711.4561
Aki Roberge
Aki Roberge and Alycia J. Weinberger
Debris Disks Around Nearby Stars with Circumstellar Gas
10 pages including 4 figures. Accepted for publication in ApJ
Astrophys.J.676:509-517,2008
10.1086/527314
null
astro-ph
null
We conducted a survey for infrared excess emission from 16 nearby main sequence shell stars using the Multiband Imaging Photometer for Spitzer (MIPS) on the Spitzer Space Telescope. Shell stars are early-type stars with narrow absorption lines in their spectra that appear to arise from circumstellar (CS) gas. Four of the 16 stars in our survey showed excess emission at 24 microns and 70 microns characteristic of cool CS dust and are likely to be edge-on debris disks. Including previously known disks, it appears that the fraction of protoplanetary and debris disks among the main sequence shell stars is at least 48% +/- 14%. While dust in debris disks has been extensively studied, relatively little is known about their gas content. In the case of Beta Pictoris, extensive observations of gaseous species have provided insights into the dynamics of the CS material and surprises about the composition of the CS gas coming from young planetesimals (e.g. Roberge et al. 2006). To understand the co-evolution of gas and dust through the terrestrial planet formation phase, we need to study the gas in additional debris disks. The new debris disk candidates from this Spitzer survey double the number of systems in which the gas can be observed right now with sensitive line of sight absorption spectroscopy.
[ { "version": "v1", "created": "Wed, 28 Nov 2007 19:26:16 GMT" } ]
2010-11-11T00:00:00
[ [ "Roberge", "Aki", "" ], [ "Weinberger", "Alycia J.", "" ] ]
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711.4562
Ehud Weinsberg
Yuval Shavitt, Eran Shir, Udi Weinsberg
Near-Deterministic Inference of AS Relationships
null
null
null
null
cs.NI
null
The discovery of Autonomous Systems (ASes) interconnections and the inference of their commercial Type-of-Relationships (ToR) has been extensively studied during the last few years. The main motivation is to accurately calculate AS-level paths and to provide better topological view of the Internet. An inherent problem in current algorithms is their extensive use of heuristics. Such heuristics incur unbounded errors which are spread over all inferred relationships. We propose a near-deterministic algorithm for solving the ToR inference problem. Our algorithm uses as input the Internet core, which is a dense sub-graph of top-level ASes. We test several methods for creating such a core and demonstrate the robustness of the algorithm to the core's size and density, the inference period, and errors in the core. We evaluate our algorithm using AS-level paths collected from RouteViews BGP paths and DIMES traceroute measurements. Our proposed algorithm deterministically infers over 95% of the approximately 58,000 AS topology links. The inference becomes stable when using a week worth of data and as little as 20 ASes in the core. The algorithm infers 2-3 times more peer-to-peer relationships in edges discovered only by DIMES than in RouteViews edges, validating the DIMES promise to discover periphery AS edges.
[ { "version": "v1", "created": "Wed, 28 Nov 2007 19:20:08 GMT" } ]
2007-11-29T00:00:00
[ [ "Shavitt", "Yuval", "" ], [ "Shir", "Eran", "" ], [ "Weinsberg", "Udi", "" ] ]
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711.4563
Paul Hodge
O. K. Krienke and Paul W. Hodge
An HST Survey of the Disk Cluster Population of M31. II. ACS Pointings
15 pages, 5 figures, 4 tables
null
null
null
astro-ph
null
This paper reports on a survey of star clusters in M31 based on archival images from the Hubble Space Telescope. Paper I (Krienke and Hodge 2007) reported results from images obtained with the Wide Field/Planetary Camera 2 (WFPC2) and this paper reports results from the Advanced Camera for Surveys (ACS). The ACS survey has yielded a total of 339 star clusters. The color- integrated magnitude diagram of clusters shows three significant features: (1) a group of very red, luminous objects: the globular clusters, (2) a wide range in color for the fainter clusters, representing a considerable range in age and reddening, and (3) a maximum density of intermediate-age, intermediate-mass clusters with ages close to 500 million years and masses of about 2000 solar masses. We give a brief qualitative interpretation of the distribution of clusters in the CMDs in terms of their formation and destruction rates.
[ { "version": "v1", "created": "Wed, 28 Nov 2007 19:19:03 GMT" } ]
2007-11-29T00:00:00
[ [ "Krienke", "O. K.", "" ], [ "Hodge", "Paul W.", "" ] ]
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711.4564
Carlos A. R. Herdeiro
Carlos A. R. Herdeiro, Raquel H. Ribeiro, Marco Sampaio
Scalar Casimir Effect on a D-dimensional Einstein Static Universe
37 pages, 15 figures, v2: minor changes in sections 1, 2.5, 3 and 4; version published in CQG
Class.Quant.Grav.25:165010,2008
10.1088/0264-9381/25/16/165010
null
hep-th
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We compute the renormalised energy momentum tensor of a free scalar field coupled to gravity on an (n+1)-dimensional Einstein Static Universe (ESU), RxS^n, with arbitrary low energy effective operators (up to mass dimension n+1). A generic class of regulators is used, together with the Abel-Plana formula, leading to a manifestly regulator independent result. The general structure of the divergences is analysed to show that all the gravitational couplings (not just the cosmological constant) are renormalised for an arbitrary regulator. Various commonly used methods (damping function, point-splitting, momentum cut-off and zeta function) are shown to, effectively, belong to the given class. The final results depend strongly on the parity of n. A detailed analytical and numerical analysis is performed for the behaviours of the renormalised energy density and a quantity `sigma' which determines if the strong energy condition holds for the `quantum fluid'. We briefly discuss the quantum fluid back-reaction problem, via the higher dimensional Friedmann and Raychaudhuri equations, observe that equilibrium radii exist and unveil the possibility of a `Casimir stabilisation of Einstein Static Universes'.
[ { "version": "v1", "created": "Wed, 28 Nov 2007 19:26:07 GMT" }, { "version": "v2", "created": "Fri, 29 Aug 2008 10:32:26 GMT" } ]
2008-11-26T00:00:00
[ [ "Herdeiro", "Carlos A. R.", "" ], [ "Ribeiro", "Raquel H.", "" ], [ "Sampaio", "Marco", "" ] ]
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711.4565
Marcelo Miguel Miller Bertolami
Marcelo M. Miller Bertolami, Leandro G. Althaus
The importance of the remnant's mass for VLTP born again times. Implications for V4334 Sgr and V605 Aql
4 Pages, 2 Figures, 1 Table. Presented at the Third Conference in Hydrogen Deficient Stars, Tubingen, September, 2007
Hydrogen-Deficient Stars ASP Conference Series, Vol. 391, proceedings of the conference held 17-21 September, 2007, p.203
null
null
astro-ph
null
We present numerical simulations of the very late thermal pulse (VLTP) scenario for a wide range of remnant masses. We show that, by taking into account the different possible remnant masses, the fast outburst evolution of V4334 Sgr (a.k.a. Sakurai's Object) and V605 Aql can be reproduced within standard 1D stellar evolution models. A dichotomy in the born again timescales is found, with lower mass remnants evolving in a few years and higher mass remnants (M $\hbox{\rlap{\hbox{\lower4pt\hbox{$\sim$}}}\hbox{$>$}}$ 0.6 M$_{\odot}$) failing to expand due to the H-flash and, as a consequence, evolving in timescales typical of He-shell flash driven born agains ($\sim 100$ yr).
[ { "version": "v1", "created": "Wed, 28 Nov 2007 19:31:08 GMT" } ]
2008-08-27T00:00:00
[ [ "Bertolami", "Marcelo M. Miller", "" ], [ "Althaus", "Leandro G.", "" ] ]
[ 0.0219175797, 0.0587236919, 0.0631724522, -0.0322980285, -0.0447842292, -0.0049047628, 0.045851931, 0.0415218025, 0.039564345, 0.0122415172, -0.0472458787, 0.0892125592, -0.1061178595, -0.0619861186, 0.0256990287, 0.0996523276, -0.0442503765, -0.1070669293, -0.0260252729, 0.0647740141, -0.0670280531, -0.1097955108, -0.0460298844, 0.0616895333, -0.1303784549, -0.0270781461, 0.0028935506, 0.0250613727, 0.0714768171, -0.0585753992, 0.0628758743, -0.0560840927, -0.0937206373, -0.0525843948, -0.1625282019, 0.1812723279, 0.0286797024, 0.0515760109, -0.0892718732, -0.0263960026, -0.0482839234, 0.0140877543, -0.0736715421, 0.1346492767, 0.0090384064, 0.1108038947, -0.0009722404, -0.0492329933, 0.0379331335, 0.0427377969, -0.0529996157, 0.0353528485, -0.0451697893, 0.0513090827, -0.1073635146, -0.1337002069, 0.0278196074, 0.0273450725, 0.0506565981, -0.0721886158, -0.0291838944, -0.0452291071, 0.0267667323, -0.0455553494, 0.0176467653, 0.0052792006, 0.0088159684, 0.0565586276, 0.024216108, 0.0125900032, -0.0988812074, -0.046712026, -0.004163302, -0.0912886485, -0.0317938365, 0.0399499051, 0.0152147748, -0.0011066302, 0.0385856181, 0.0345224142, 0.0287686773, -0.0330988094, 0.053355515, 0.0345817283, -0.0360646509, -0.0014208242, -0.0075925579, 0.0098243551, -0.0762221664, -0.0193669554, 0.0324166641, 0.0324759819, 0.0486694835, -0.0218137745, 0.087966904, -0.0677991733, 0.0467416868, -0.1115750149, 0.0530589297, 0.0443393514, 0.0315862261, 0.0169794504, 0.0754510462, -0.0500634313, -0.0086825052, 0.039534688, -0.0012020932, 0.0593761764, -0.0332767591, 0.0080151903, 0.0541562922, -0.0779423565, -0.0903395787, 0.0593761764, -0.0844672099, -0.0627572387, -0.1120495498, 0.024275424, -0.0230297707, 0.0909327492, 0.0237267446, -0.0103952801, -0.0639435723, 0.0051049571, -0.0087863095, -0.0460891984, 0.0991777927, -0.0119226892, 0.0219472386, -0.0259066392, 0.0423818976, -0.1013131961, 0.0754510462, -0.1064144447, -0.0787134692, 0.0443986692, -0.0455850065, -0.0110700093, 0.0829249695, 0.0185365193, -0.040068537, -0.0848231092, 0.0034978411, 0.0372509882, 0.0787727907, 0.0948476568, -0.0039186198, -0.0302960854, -0.0186403226, -0.0472755358, -0.0494999178, 0.0129533196, 0.0387339108, 0.0420259945, 0.0048491531, -0.1103886738, -0.0231335759, -0.0031475008, -0.0973982811, -0.0853569582, -0.0121451272, -0.0587533489, -0.0600583218, -0.006832561, -0.0479873382, 0.0577449612, -0.0800184458, 0.0286648721, -0.2061854005, -0.0616302155, 0.050626941, -0.0871957839, -0.0571517944, -0.1819841266, -0.024468204, 0.0724852011, -0.0198414903, -0.0953815132, -0.0481356308, -0.0172167178, 0.0762814805, 0.0663755685, 0.0140729249, -0.0435682349, -0.0852383301, 0.0333360769, -0.0885600746, 0.057774622, -0.0482246056, -0.042263262, -0.0257286876, 0.0255062506, 0.0588719845, 0.0283089709, -0.0326242745, -0.063587673, 0.0241419617, -0.0066842688, -0.0267074164, 0.0957374126, 0.1020250022, 0.0516056679, 0.1203539073, -0.1523256898, -0.009023577, -0.057774622, 0.0637656227, 0.0553426296, 0.0444283262, 0.0645960569, 0.0755103603, 0.0014690191, 0.0540079996, -0.0157189686, -0.0487288013, 0.0095574288, -0.0105435718, 0.051991228, 0.046712026, -0.007785338, 0.065248549, 0.006958609, 0.0717734024, 0.1295480281, 0.0178247169, 0.0628758743, 0.1134138331, -0.0153334085, 0.0659010336, 0.0736715421, -0.0050271037, 0.0344927534, -0.0872550979, -0.0400981978, 0.0292876996, 0.0297029167, 0.015763456, 0.0267519038, -0.0310227182, -0.0415811203, -0.0119968345, 0.0973982811, 0.1280057877, 0.0314972512, 0.0334547088, 0.0611556806, -0.066316247, -0.0636469871, 0.0053162738, -0.0097131357, 0.1147781238, -0.1109818444, 0.0784168914, -0.0062023192, -0.0111293262, 0.0037091575 ]
711.4566
Xiaoli Han
Xiaoli Han, Jiayu Li
The second type singularity of symplectic and Lagrangian mean curvature flows
null
null
null
null
math.DG math.AP
null
In this paper we mainly study the type II singularities of the mean curvature flow from a symplectic surface or from an almost calibrated Lagrangian surface in a K \"ahler-Einstein surface. We show the relation between the maximum of the K\"ahler angle and the maximum of $|H|^2$ on the limit flow.
[ { "version": "v1", "created": "Wed, 28 Nov 2007 19:32:57 GMT" }, { "version": "v2", "created": "Tue, 5 Feb 2008 14:28:14 GMT" } ]
2008-02-05T00:00:00
[ [ "Han", "Xiaoli", "" ], [ "Li", "Jiayu", "" ] ]
[ 0.0439054631, -0.0311370362, 0.0182566084, -0.0305322167, 0.0654549822, -0.0114915827, -0.0304426141, -0.0856604502, -0.0395597182, -0.0222663414, -0.0605268143, -0.0852572396, -0.0976672545, 0.1240105256, 0.0567634888, 0.0936351195, -0.0489680283, -0.0260296669, 0.1099428609, 0.0741464645, -0.0699351281, -0.0997281224, 0.0398061238, 0.1870910227, 0.0238791946, -0.0489680283, 0.0445102826, 0.0008386279, 0.0356843881, -0.0255816523, -0.028852161, -0.0516113192, 0.0052557751, -0.0129812323, -0.0626772866, 0.2078789175, -0.0134852491, 0.1285802871, 0.0006373712, -0.0094475141, -0.0165877528, 0.0314954482, -0.0900509953, 0.0856156498, 0.0638421252, -0.0393133089, 0.0521489345, 0.0206870884, -0.0130372336, 0.0126340203, -0.0716823861, -0.0320778675, 0.061691653, -0.0978464559, -0.0572115034, 0.0271273032, 0.0176629871, 0.0714583769, 0.0422030054, -0.1238313243, 0.0405453481, -0.1027746201, -0.1230248958, -0.0485200137, -0.0729816258, -0.0062386077, -0.1048354879, -0.0185142159, 0.0353259742, 0.0533585772, -0.0665750131, 0.000572269, -0.0041189371, 0.0788058266, -0.0242152065, -0.0072746421, -0.0200262666, 0.0855260491, 0.0504016764, 0.0572115034, 0.0718615949, 0.003152905, 0.0165093504, 0.04231501, 0.0093467114, -0.0744600818, -0.0008246275, -0.0437262543, -0.1557299793, 0.0437262543, 0.0086634886, 0.0217623245, 0.0206758883, -0.034631554, -0.0039173304, 0.0605268143, 0.0327722915, -0.0691734999, -0.0084786825, 0.0706519485, 0.0160053335, 0.0322122723, 0.0139556648, 0.0410381667, 0.1212328374, -0.0060818023, -0.0022988764, 0.0196454544, -0.0105395513, -0.0814939141, 0.0307338238, -0.0347211547, -0.0079410644, 0.0642901435, 0.0629012957, -0.037252441, -0.1296555102, 0.0357067883, -0.081269905, 0.0864668787, 0.0259400643, -0.0728920251, 0.0549714305, -0.0364684127, -0.0591827706, -0.055419445, -0.0313834436, -0.0071178367, -0.2066244781, 0.0223447438, 0.0740120634, -0.0465039462, -0.0089882994, -0.0549714305, 0.0711447671, -0.0211015027, 0.0587795563, -0.0120964022, 0.0700247288, -0.0590483658, -0.0129812323, 0.1011617705, 0.0754009113, 0.0111555718, 0.1096740514, 0.052417744, -0.0792986378, 0.0682326704, 0.0212247074, 0.0361996032, 0.0232967753, 0.0536273867, 0.0119731985, 0.0680534616, -0.1552819759, -0.000300135, 0.0664406121, 0.0055805859, 0.0201718714, -0.0044773491, -0.016251741, 0.0248424262, -0.0005054168, -0.0224007461, -0.029367378, -0.0395373143, 0.004625754, -0.0144260805, -0.0205638837, -0.1460528672, -0.0462351404, 0.0156805217, -0.0609300286, -0.0217175223, 0.0441070683, -0.0222439412, -0.0173269771, -0.1345836818, -0.0919326618, 0.1340460628, 0.0109763658, 0.0613780431, -0.0200598668, -0.0271273032, -0.0728472248, 0.1331500262, 0.0370732322, 0.0966816172, 0.0392237045, -0.0282249395, -0.0298153926, 0.0725336149, 0.1561779976, 0.0438382588, 0.0066194204, -0.0696215183, 0.0387756899, 0.0854812488, -0.0902750045, 0.0054657818, 0.0679638609, -0.054702621, 0.0435022488, -0.078447409, -0.0298825949, -0.0139668649, 0.0879005268, 0.061154034, -0.0642005354, -0.0570322983, -0.0578835271, 0.055957064, 0.0349003635, 0.1279530525, -0.0023772791, 0.1023266092, -0.026208872, 0.0245960187, 0.0372748412, 0.0441070683, 0.0362892076, 0.0316746533, -0.0003941131, 0.0491920374, -0.0329738967, 0.0052613751, 0.1232937053, -0.0289417636, -0.0338251255, -0.0075042499, 0.1184551418, 0.0215495173, -0.0568530932, -0.0389772989, -0.0540305972, -0.1074339747, 0.0141908722, 0.0214711148, -0.0390444994, -0.0296137854, 0.0539857969, 0.0072242403, -0.0413517766, 0.0449806973, 0.0070786355, -0.0162069388, -0.0474895798, 0.0499536619, 0.1096740514, -0.0252456404, -0.014336477, 0.029703388, 0.0340043306, 0.0299497973, -0.05071529, -0.0518801287 ]
711.4567
Savely G. Karshenboim
Savely G. Karshenboim
Guide for atomic and particle physicists to CODATA's recommended values of the fundamental physical constants
presented at PSAS'2006; to be pubslished in Lect. Not. Phys
Lect.Notes Phys.745:35-53,2008
10.1007/978-3-540-75479-4_15
null
physics.atom-ph
null
The CODATA recommended values of the fundamental constants are widely applied in particle, nuclear and atomic physics. They are a result of a complicated evaluation (adjustment) of numerous correlated data of different nature. Their application is often rather mechanical and as a result is not free of various confusions which are discussed in this note.
[ { "version": "v1", "created": "Wed, 28 Nov 2007 19:35:28 GMT" } ]
2009-01-09T00:00:00
[ [ "Karshenboim", "Savely G.", "" ] ]
[ 0.0488846712, 0.0249058753, 0.0165621564, 0.0124341454, 0.0449508466, 0.0243671667, -0.0600847974, -0.1529431194, 0.0312200412, 0.0007904452, 0.0271358788, 0.0153344022, -0.1303925365, -0.0663488507, 0.1110491306, 0.1178644225, 0.0366822965, 0.0732643679, 0.0068215537, 0.0222624447, -0.0826353878, -0.0544722043, 0.0189174414, 0.0509392805, -0.0872958452, -0.1045345217, -0.0202704761, 0.0210096333, 0.0476318598, -0.0926077589, -0.0174767077, -0.0296164434, -0.0343771242, -0.0574789532, -0.033951167, 0.1002749652, 0.0594333373, 0.0229013786, -0.0845897719, -0.026584642, -0.0504381545, -0.0186668783, -0.0726630166, 0.0524175949, 0.0048358492, -0.0913549513, -0.0338759981, -0.0989219248, -0.0008667884, -0.0882980898, -0.126383543, 0.0019543846, 0.0590825491, 0.0312450975, 0.0865441561, 0.087696746, 0.0717108771, -0.0144699626, -0.0553241186, -0.0461284891, 0.0035986984, -0.0709591955, -0.12969096, 0.0176771581, -0.0478072539, 0.0287895873, -0.0295663308, 0.0704580694, 0.0019966669, -0.001053144, 0.0559254661, 0.0467047803, 0.0471307375, 0.0217738487, -0.0151965925, 0.0006303203, 0.0499119759, 0.0218490176, 0.0264092479, 0.0284889136, -0.0565268137, 0.0236655921, -0.0451011844, -0.0823848248, -0.0225255359, 0.0344272368, 0.0049047535, -0.0594834499, -0.0179653037, 0.0151715362, -0.0799794272, -0.0687542483, -0.01441985, 0.1251808405, -0.0566771515, -0.082735613, 0.0941612497, 0.0254320558, 0.1099466607, 0.0084314151, -0.0381104983, 0.0124153532, 0.054221645, 0.0137308044, 0.1750928164, 0.121171847, 0.0372084752, -0.1262833178, -0.0893003419, -0.0127160279, -0.0389122963, -0.0583809763, -0.1392123103, 0.0175894611, -0.0222499166, 0.0080493083, -0.0812823549, 0.0741663873, -0.0944619179, -0.0103670079, -0.0044662701, 0.0350786969, 0.115960151, -0.014507547, -0.0168878864, -0.0616382845, 0.0106927389, -0.0644445792, -0.0290902629, -0.0473311841, 0.0757699832, -0.1118509322, 0.0124404095, -0.0726630166, -0.0421946608, 0.0072412454, -0.0872958452, -0.0232646931, 0.0398644358, 0.0878971964, 0.0288396999, 0.0509392805, 0.0123339202, 0.1222743168, -0.0472059026, 0.0141317034, -0.0999241769, 0.0475065783, 0.0077674259, -0.0330992565, -0.0883482024, 0.0419190452, 0.0333247632, -0.0161111448, 0.052918721, -0.0406662337, 0.093108885, 0.0061074519, 0.0378098264, -0.0108806603, 0.0519665852, -0.0120645659, -0.0367574655, 0.0310446471, 0.0505884923, 0.0033544004, -0.1095457599, -0.0879974216, -0.0564265922, -0.0573787279, 0.0213103089, -0.0630414337, -0.0188548006, -0.0801798776, 0.1142563298, 0.1099466607, 0.0694057122, -0.0601850227, -0.1103475615, -0.0351789221, 0.0989720374, -0.0670504272, 0.0100538051, -0.0257076733, 0.0156977177, -0.0234651435, 0.0265345294, 0.0368326306, -0.0302679054, -0.0351037532, -0.0008824485, 0.0197192393, 0.0774236992, 0.0988216996, -0.0454770252, -0.0875464082, -0.0013491204, -0.1051358655, 0.0607362576, -0.0023396239, -0.0141317034, -0.0541715324, 0.0525679328, -0.0659479499, -0.0872457325, -0.0686039105, 0.0071535488, -0.0322222896, -0.1191673502, -0.0457526445, -0.0187295191, 0.0018197075, -0.0245300326, 0.131996125, -0.0341015048, 0.0298419483, -0.0307690296, 0.0096842265, -0.1033318192, 0.0158229973, -0.1085435152, 0.1547471732, 0.1401143372, 0.0816331431, -0.0540211946, -0.0696562678, -0.0027201651, -0.0198319927, 0.0316209421, -0.0218114331, -0.02738644, 0.0217738487, 0.0299171172, 0.0417937636, -0.0591827743, -0.0443996079, 0.0095088324, 0.0731140301, -0.0223125573, -0.0560256913, -0.0464041047, 0.0391127467, -0.1349026412, 0.0731140301, 0.013129455, -0.0473061278, -0.0013326773, 0.0104045924, 0.0507137738, 0.0504882671, 0.0445499457, -0.059884347, 0.0511647873, -0.1015778854, -0.0550735556, -0.1014275476 ]
711.4568
Daniel Snowman
Daniel P. Snowman
Quantifying Student Effort and Class Involvement in the Introductory Higher Education Science Classroom
null
null
null
null
physics.ed-ph
null
This note details a minimal effort program, Cash Participation, that quantifies class participation while increasing class energy, decreasing student apathy and removing student embraced anonymity.
[ { "version": "v1", "created": "Wed, 28 Nov 2007 19:38:39 GMT" } ]
2007-11-29T00:00:00
[ [ "Snowman", "Daniel P.", "" ] ]
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711.4569
Savely G. Karshenboim
Savely G. Karshenboim
Conceptual problems in phenomenological interpretation in searches for variation of constants & violation of various invariances
null
Adv.Quant.Chem.53:237-252,2008
10.1016/S0065-3276(07)53012-1
null
physics.atom-ph
null
At present a number of current or proposed experiments are directed towards a search for a `new physics' by detecting variations of fundamental physical constants or violations of certain basic symmetries. Various problems related to the phenomenology of such experiments are considered here.
[ { "version": "v1", "created": "Wed, 28 Nov 2007 19:43:01 GMT" } ]
2015-05-13T00:00:00
[ [ "Karshenboim", "Savely G.", "" ] ]
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711.457
Lev I. Shekhtman
V. M. Aulchenko, P. A. Papushev, M. R. Sharafutdinov, L. I. Shekhtman, V. M. Titov, B. P. Tolochko, V. V. Zhulanov
Development of one-coordinate gaseous detector for wide angle diffraction studies
null
JINST3:P04008,2008
10.1088/1748-0221/3/04/P04008
null
physics.ins-det
null
A one-coordinate gaseous detector of soft X-ray photons for wide-angle X-ray scattering (WAXS) studies is being developed. The detector operates in counting mode and is based on multi-stage Gas Electron Multiplier(GEM). Full size detector is assembled and has 67 degrees aperture with 350mm distance to the source, readout multi-strip structure with 2048 strips at 0.2mm pitch and is partially equipped with readout electronics in the central part. Main parameters of the detector have been measured with 8keV X-ray beam at VEPP-3 synchrotron ring. Spatial resolution of 470 um (FWHM) has been demonstrated that will allow to distinguish diffraction spots at 0.1 degrees.
[ { "version": "v1", "created": "Wed, 28 Nov 2007 19:43:45 GMT" } ]
2008-11-26T00:00:00
[ [ "Aulchenko", "V. M.", "" ], [ "Papushev", "P. A.", "" ], [ "Sharafutdinov", "M. R.", "" ], [ "Shekhtman", "L. I.", "" ], [ "Titov", "V. M.", "" ], [ "Tolochko", "B. P.", "" ], [ "Zhulanov", "V. V.", "" ] ]
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711.4571
Alexander V. Milovanov Dr.
A. V. Milovanov (Department of Physics and Technology, University of Tromso, Tromso, Norway) K. Rypdal (Department of Physics and Technology, University of Tromso, Tromso, Norway) J. J. Rasmussen (Optics and Plasma Research Department, Technical University of Denmark, Riso National Laboratory, Roskilde, Denmark)
E-pile model of self-organized criticality
4 pages, 2 figures
null
null
null
cond-mat.stat-mech
null
The concept of percolation is combined with a self-consistent treatment of the interaction between the dynamics on a lattice and the external drive. Such a treatment can provide a mechanism by which the system evolves to criticality without fine tuning, thus offering a route to self-organized criticality (SOC) which in many cases is more natural than the weak random drive combined with boundary loss/dissipation as used in standard sand-pile formulations. We introduce a new metaphor, the e-pile model, and a formalism for electric conduction in random media to compute critical exponents for such a system. Variations of the model apply to a number of other physical problems, such as electric plasma discharges, dielectric relaxation, and the dynamics of the Earth's magnetotail.
[ { "version": "v1", "created": "Wed, 28 Nov 2007 19:58:18 GMT" } ]
2007-11-29T00:00:00
[ [ "Milovanov", "A. V.", "", "Department of Physics and Technology, University of\n Tromso, Tromso, Norway" ], [ "Rypdal", "K.", "", "Department of Physics and Technology,\n University of Tromso, Tromso, Norway" ], [ "Rasmussen", "J. J.", "", "Optics and Plasma\n Research Department, Technical University of Denmark, Riso National\n Laboratory, Roskilde, Denmark" ] ]
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711.4572
Shane P. O'Sullivan
D. C. Gabuzda, V. M. Vitrishchak, M. Mahmud, S. P. O'Sullivan
Radio Circular Polarization Produced in Helical Magnetic Fields in Eight Active Galactic Nuclei
24 pages, 6 figures, accepted for publication in Monthly Notices of the Royal Astronomical Society (MNRAS)
null
10.1111/j.1365-2966.2007.12773.x
null
astro-ph
null
Homan & Lister (2006) have recently published circular-polarization (CP) detections for 34 objects in the MOJAVE sample - a set of bright, compact AGN being monitored by the Very Long Baseline Array at 15 GHz. We report the detection of 15-GHz parsec-scale CP in two more AGN (3C345 and 2231+114), and confirm the MOJAVE detection of CP in 1633+382. It is generally believed that the most likely mechanism for the generation of this CP is Faraday conversion of linear polarization to CP. A helical jet magnetic-field (B-field) geometry can facilitate this process - linearly polarized emission from the far side of the jet is converted to CP as it passes through the magnetised plasma at the front side of the jet on its way toward the observer. In this case, the sign of the generated CP is essentially determined by the pitch angle and helicity of the helical B field. We have determined the pitch-angle regimes and helicities of the helical jet B fields in 8 AGN for which parsec-scale CP has been detected, and used them to predict the expected CP signs for these AGN if the CP is generated via conversion in these helical fields. We have obtained the intriguing result that our predictions agree with the observed signs in all eight cases, provided that the longitudinal B-field components in the jets correspond to South magnetic poles. This clearly non-random pattern demonstrates that the observed CP in AGN is directly associated with the presence of helical jet B fields. These results suggest that helical B fields are ubiquitous in AGN jets.
[ { "version": "v1", "created": "Wed, 28 Nov 2007 20:04:12 GMT" } ]
2009-11-13T00:00:00
[ [ "Gabuzda", "D. C.", "" ], [ "Vitrishchak", "V. M.", "" ], [ "Mahmud", "M.", "" ], [ "O'Sullivan", "S. P.", "" ] ]
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711.4573
Mathieu Raffinot
Pierre Charbit (LIAFA), Michel Habib (LIAFA), Vincent Limouzy (LIAFA), Fabien De Montgolfier (LIAFA), Mathieu Raffinot (LIAFA), Micha\"el Rao (LIRMM)
A Note On Computing Set Overlap Classes
null
null
null
null
cs.DS
null
Let ${\cal V}$ be a finite set of $n$ elements and ${\cal F}=\{X_1,X_2, >..., X_m\}$ a family of $m$ subsets of ${\cal V}.$ Two sets $X_i$ and $X_j$ of ${\cal F}$ overlap if $X_i \cap X_j \neq \emptyset,$ $X_j \setminus X_i \neq \emptyset,$ and $X_i \setminus X_j \neq \emptyset.$ Two sets $X,Y\in {\cal F}$ are in the same overlap class if there is a series $X=X_1,X_2, ..., X_k=Y$ of sets of ${\cal F}$ in which each $X_iX_{i+1}$ overlaps. In this note, we focus on efficiently identifying all overlap classes in $O(n+\sum_{i=1}^m |X_i|)$ time. We thus revisit the clever algorithm of Dahlhaus of which we give a clear presentation and that we simplify to make it practical and implementable in its real worst case complexity. An useful variant of Dahlhaus's approach is also explained.
[ { "version": "v1", "created": "Wed, 28 Nov 2007 20:07:46 GMT" } ]
2007-11-29T00:00:00
[ [ "Charbit", "Pierre", "", "LIAFA" ], [ "Habib", "Michel", "", "LIAFA" ], [ "Limouzy", "Vincent", "", "LIAFA" ], [ "De Montgolfier", "Fabien", "", "LIAFA" ], [ "Raffinot", "Mathieu", "", "LIAFA" ], [ "Rao", "Michaël", "", "LIRMM" ] ]
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711.4574
Anthony Randriamampianina
Anthony Randriamampianina (IRPHE), Pierre Maubert (IRPHE), Wolf-Gerrit Fruh (SEPS), Peter L. Read (AOPP)
Direct Numerical Simulation of structural vacillation in the transition to geostrophic turbulence
6 pages
Dans Stratified and Rotating Flows Symposium, Congres Francais de Mecanique - Congres Francais de Mecanique, Grenoble : France (2007)
null
null
physics.geo-ph nlin.CD
null
The onset of small-scale fluctuations around a steady convection pattern in a rotating baroclinic annulus filled with air is investigated using Direct Numerical Simulation. In previous laboratory experiments of baroclinic waves, such fluctuations have been associated with a flow regime termed Structural Vacillation which is regarded as the first step in the transition to fully-developed geostrophic turbulence.
[ { "version": "v1", "created": "Wed, 28 Nov 2007 20:08:49 GMT" } ]
2007-11-29T00:00:00
[ [ "Randriamampianina", "Anthony", "", "IRPHE" ], [ "Maubert", "Pierre", "", "IRPHE" ], [ "Fruh", "Wolf-Gerrit", "", "SEPS" ], [ "Read", "Peter L.", "", "AOPP" ] ]
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711.4575
G. Bourda
G. Bourda (SYRTE), N. Capitaine (SYRTE)
Precession, nutation, and space geodetic determination of the Earth's variable gravity field
null
Astron.Astrophys.428:691-702,2004
10.1051/0004-6361:20041533
null
astro-ph physics.space-ph
null
Precession and nutation of the Earth depend on the Earth's dynamical flattening, H, which is closely related to the second degree zonal coefficient, J2 of the geopotential. A small secular decrease as well as seasonal variations of this coefficient have been detected by precise measurements of artificial satellites (Nerem et al. 1993; Cazenave et al. 1995) which have to be taken into account for modelling precession and nutation at a microarcsecond accuracy in order to be in agreement with the accuracy of current VLBI determinations of the Earth orientation parameters. However, the large uncertainties in the theoretical models for these J2 variations (for example a recent change in the observed secular trend) is one of the most important causes of why the accuracy of the precession-nutation models is limited (Williams 1994; Capitaine et al. 2003). We have investigated in this paper how the use of the variations of J2 observed by space geodetic techniques can influence the theoretical expressions for precession and nutation. We have used time series of J2 obtained by the "Groupe de Recherches en G\'eod\'esie spatiale" (GRGS) from the precise orbit determination of several artificial satellites from 1985 to 2002 to evaluate the effect of the corresponding constant, secular and periodic parts of H and we have discussed the best way of taking the observed variations into account. We have concluded that, although a realistic estimation of the J2 rate must rely not only on space geodetic observations over a limited period but also on other kinds of observations, the monitoring of periodic variations in J2 could be used for predicting the effects on the periodic part of the precession-nutation motion.
[ { "version": "v1", "created": "Wed, 28 Nov 2007 20:09:39 GMT" } ]
2009-06-23T00:00:00
[ [ "Bourda", "G.", "", "SYRTE" ], [ "Capitaine", "N.", "", "SYRTE" ] ]
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711.4576
Michel Destrade
Michel Destrade (LMM)
Seismic Rayleigh waves on an exponentially graded, orthotropic half-space
8 pages
Proceedings of the Royal Society of London A463 (2007) 495-502
10.1098/rspa.2006.1774
null
physics.geo-ph
null
Efforts at modelling the propagation of seismic waves in half-spaces with continuously varying properties have been mostly focused on shear-horizontal waves. Here a sagittaly polarized (Rayleigh type) wave travels along a symmetry axis (and is attenuated along another) of an orthotropic material with stiffnesses and mass density varying in the same exponential manner with depth. Contrary to what could be expected at first sight, the analysis is very similar to that of the homogeneous half-space, with the main and capital difference that the Rayleigh wave is now dispersive. The results are illustrated numerically for (i) an orthotropic half-space typical of horizontally layered and vertically fractured shales and (ii) for an isotropic half-space made of silica. In both examples, the wave travels at a slower speed and penetrates deeper than in the homogeneous case; in the second example, the inhomogeneity can force the wave amplitude to oscillate as well as decay with depth, in marked contrast with the homogeneous isotropic general case.
[ { "version": "v1", "created": "Wed, 28 Nov 2007 20:10:13 GMT" } ]
2007-11-29T00:00:00
[ [ "Destrade", "Michel", "", "LMM" ] ]
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711.4577
G. Bourda
G. Bourda (SYRTE)
Gravitational potential, inertia and Earth rotation
null
Dans Journ\'ees 2002 - syst\`emes de r\'ef\'erence spatio-temporels. - Astrometry from ground and from space, Bucarest : Roumanie (2002)
null
null
astro-ph physics.space-ph
null
Several satellite missions, devoted to the study of the Earth gravity field, have been launched (like CHAMP, recently). This year, GRACE (Gravity Recovery and Climate Experiment) will allow us to obtain a more precise geoid. But the most important is that they will supply the temporal variations of the geopotential coefficients (called Stokes coefficients). In the poster we show how the Earth gravitational potential is linked to the Earth rotation parameters. Indeed, through the Earth inertia coefficients, we can connect the variation of LOD and Polar Motion with the temporal variations of the Stokes coefficients. We also consider the nutations, that are related to the gravitational geopotential coefficients. We discuss the possibility of using the Stokes coefficients in order to improve our knowledge of the Earth rotation.
[ { "version": "v1", "created": "Wed, 28 Nov 2007 20:10:33 GMT" } ]
2007-11-29T00:00:00
[ [ "Bourda", "G.", "", "SYRTE" ] ]
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711.4578
Cristinel Diaconu
H1 Collaboration
Measurement of Isolated Photon Production in Deep-Inelastic Scattering at HERA
32 pages, 10 figures
Eur.Phys.J.C54:371-387,2008
10.1140/epjc/s10052-008-0541-6
DESY 07-147
hep-ex
null
The production of isolated photons in deep-inelastic scattering $ep\to e \gamma X$ is measured with the H1 detector at HERA. The measurement is performed in the kinematic range of negative four-momentum transfer squared $4<Q^2<150 $~GeV$^2$ and a mass of the hadronic system $W_X>50$ GeV. The analysis is based on a total integrated luminosity of 227~pb$^{-1}$. The production cross section of isolatedphotons with a transverse energy in the range $3 < E_T^\gamma < 10$ GeV and pseudorapidity range $-1.2 < \eta^\gamma < 1.8$ is measured as a function of $E_T^\gamma$, $\eta^\gamma$ and $Q^2$. Isolated photon cross sections are also measured for events with no jets or at least one hadronic jet. The measurements are compared with predictions from Monte Carlo generators modelling the photon radiation from the quark and the electron lines, as well as with calculations at leading and next to leading order in the strong coupling. The predictions significantly underestimate the measured cross sections.
[ { "version": "v1", "created": "Wed, 28 Nov 2007 20:31:59 GMT" } ]
2012-08-27T00:00:00
[ [ "H1 Collaboration", "", "" ] ]
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711.4579
G. Bourda
G. Bourda (SYRTE), N. Capitaine (SYRTE)
Temporal variations of the gravity field and Earth precession-nutation
null
Dans Journ\'ees 2003 - Syst\`emes de r\'ef\'erence spatio-temporels. - Astrometry, geodynamics and solar system dynamics: from milliarseconds to microarcseconds, St. Petersburg : Russie (2003)
null
null
astro-ph physics.space-ph
null
Due to the accuracy now reached by space geodetic techniques, and also considering some modelisations, the temporal variations of some Earth Gravity Field coefficients can be determined. They are due to Earth oceanic and solid tides, as well as geophysical reservoirs masses displacements. They can be related to the variations in the Earth's orientation parameters (through the inertia tensor). Then, we can try to improve our knowledge of the Earth Rotation with those space measurements of the Gravity variations. We have undertaken such a study, using data obtained with the combination of space geodetic techniques. In particular, we use CHAMP data that are more sensitive to such variations and that complete the ones already accumulated (for example with Starlette and LAGEOS I). In this first approach, we focus on the Earth precession nutation, trying to refine it by taking into account the temporal variations of the Earth dynamical flattening. The goal is mainly to understand how Geodesy can influence this field of science. Like this, we will be able to compare our computation with up to date determinations of precession nutation.
[ { "version": "v1", "created": "Wed, 28 Nov 2007 20:11:46 GMT" } ]
2007-11-29T00:00:00
[ [ "Bourda", "G.", "", "SYRTE" ], [ "Capitaine", "N.", "", "SYRTE" ] ]
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711.458
Sebastian Volz
Guillaume Galli\'ero (TEFC, Trefle), S. Volz (EM2C)
Thermodiffusion in model nanofluids by molecular dynamics simulations
null
null
10.1063/1.2834545
null
cond-mat.stat-mech
null
In this work, a new algorithm is proposed to compute single particle (infinite dilution) thermodiffusion using Non-Equilibrium Molecular Dynamics simulations through the estimation of the thermophoretic force that applies on a solute particle. This scheme is shown to provide consistent results for simple Lennard-Jones fluids and for model nanofluids (spherical non-metallic nanoparticles + Lennard-Jones fluid) where it appears that thermodiffusion amplitude, as well as thermal conductivity, decrease with nanoparticles concentration. Then, in nanofluids in the liquid state, by changing the nature of the nanoparticle (size, mass and internal stiffness) and of the solvent (quality and viscosity) various trends are exhibited. In all cases the single particle thermodiffusion is positive, i.e. the nanoparticle tends to migrate toward the cold area. The single particle thermal diffusion 2 coefficient is shown to be independent of the size of the nanoparticle (diameter of 0.8 to 4 nm), whereas it increases with the quality of the solvent and is inversely proportional to the viscosity of the fluid. In addition, this coefficient is shown to be independent of the mass of the nanoparticle and to increase with the stiffness of the nanoparticle internal bonds. Besides, for these configurations, the mass diffusion coefficient behavior appears to be consistent with a Stokes-Einstein like law.
[ { "version": "v1", "created": "Wed, 28 Nov 2007 20:12:52 GMT" } ]
2009-11-13T00:00:00
[ [ "Galliéro", "Guillaume", "", "TEFC, Trefle" ], [ "Volz", "S.", "", "EM2C" ] ]
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711.4581
G. Bourda
G. Bourda (SYRTE, Igg)
Length of day and polar motion, with respect to temporal variations of the Earth gravity field
null
Dans SF2A-2005: Semaine de l'Astrophysique Francaise - SF2A-2005: Semaine de l'Astrophysique Francaise, Strasbourg : France (2005)
null
null
astro-ph physics.space-ph
null
The masses distribution inside the Earth governs the behaviour of the rotation axis in the Earth (polar motion), as well as the Earth rotation rate (or equivalently, length of day). This masses distribution can be measured from space owing to artificial satellites, the orbitography of which provides the Earth gravity field determination. Then, the temporal variations of the Earth gravity field can be related to the variations of the Earth Orientation Parameters (EOP) (with the Inertia Tensor). Nowadays, owing to the satellite laser ranging (SLR) technique and to the new gravimetric satellite missions (such as CHAMP or GRACE), the temporal variations of the low degree coefficients of the Earth gravity field (i.e. Stokes coefficients) can be determined. This paper is one of the first study using gravity variations data in the equations already established (e.g. Lambeck 1988) and linking the variations of the length of day and of the C20 Stokes coefficient (or, linking the polar motion and the C21 and S21 coefficients). This paper combines the Earth rotation data (mainly obtained from VLBI and GPS measurements) and the Earth gravity field variations ones (e.g. Lageos I and II data, or GRACE data), in order to complete and constrain the models of the Earth rotation. The final goal is a better Earth global dynamics understanding, which possible application can be the constraint on the couplings into the Earth system (e.g. core-mantle couplings).
[ { "version": "v1", "created": "Wed, 28 Nov 2007 20:17:50 GMT" } ]
2007-11-29T00:00:00
[ [ "Bourda", "G.", "", "SYRTE, Igg" ] ]
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711.4582
G. Bourda
G. Bourda (SYRTE)
Earth rotation and variations of the gravity field, in the framework of the "Descartes-nutation" project
null
Dans Journ\'ees 2004 - syst\`emes de r\'ef\'erence spatio-temporels. - Fundamental astronomy: new concepts and models for high accuracy observations, Paris : France (2004)
null
null
astro-ph physics.space-ph
null
The "Descartes-Nutation" Project is devoted to the "understanding of the next decimal of precession-nutation, from the theoretical point of view as well as from the observational point of view". In this framework, we made a proposal in order to contribute to the study of (i) the dynamical flattening of the Earth, (ii) the coupling effects of the lunisolar forcing, (iii) the effect of the geophysical fluids on the EOP and (iv) the Nutation observations. We investigate further the links between Earth Orientation and Gravity Field Variations. Indeed, the masses distributions inside the Earth govern the behaviour of the rotation axis in space (precession-nutation) and in the Earth (polar motion), as well as the Earth rotation rate (or equivalently, length of the day). These distributions of masses can be measured by space owing to artificial satellites, the orbitography of which provides the Earth gravity field determination. Then, the temporal variations of the Earth gravity field can be related to the variations of the Earth Orientation Parameters (EOP) (with the Inertia Tensor). Nowadays, the Earth orientation measurements in space, obtained with Very Long Baseline Interferometry (VLBI), have a precision better than the milliarcsecond level. It is then necessary to consider all the geophysical sources that can improve the models precision. The goal of my PhD Thesis was to use the Earth gravity field measurements, as well as its variations, as a tool to improve the Earth orientation modelisation. We present here the results obtained as well as various proposals to extend these investigations (numerical studies, the use of J2 geophysical series, integration of GRACE data ...).
[ { "version": "v1", "created": "Wed, 28 Nov 2007 20:20:00 GMT" } ]
2007-11-29T00:00:00
[ [ "Bourda", "G.", "", "SYRTE" ] ]
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711.4583
Paolo Privitera
M. Ave, et al. (for the AIRFLY Collaboration)
Temperature and Humidity Dependence of Air Fluorescence Yield measured by AIRFLY
presented at the 5th Fluorescence Workshop, El Escorial - Madrid, Spain, 16 - 20 September 2007, to appear in Nuclear Instruments and Methods A
Nucl.Instrum.Meth.A597:50-54,2008
10.1016/j.nima.2008.08.050
null
astro-ph
null
The fluorescence detection of ultra high energy cosmic rays requires a detailed knowledge of the fluorescence light emission from nitrogen molecules over a wide range of atmospheric parameters, corresponding to altitudes typical of the cosmic ray shower development in the atmosphere. We have studied the temperature and humidity dependence of the fluorescence light spectrum excited by MeV electrons in air. Results for the 313.6 nm, 337.1 nm, 353.7 nm and 391.4 nm bands are reported in this paper. We found that the temperature and humidity dependence of the quenching process changes the fluorescence yield by a sizeable amount (up to 20%) and its effect must be included for a precise estimation of the energy of ultra high energy cosmic rays.
[ { "version": "v1", "created": "Wed, 28 Nov 2007 20:28:37 GMT" } ]
2019-08-13T00:00:00
[ [ "Ave", "M.", "" ] ]
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711.4584
G. Bourda
G. Bourda (SYRTE)
Earth Orientation and Temporal Variations of the Gravity Field
null
Dans SF2A-2004: Semaine de l'Astrophysique Francaise - SF2A-2004: Semaine de l'Astrophysique Francaise, Paris : France (2004)
null
null
astro-ph physics.space-ph
null
The high accuracy now reached in the VLBI Earth Orientation Parameters (EOP) determination requires looking further at the various geophysical contributions to variations in EOP. The determination of the Earth gravity field from space geodetic techniques now allows us to obtain the temporal variations of the low degree coefficients of the geopotential, combining the treatment of different satellites (e.g. Lageos1, Lageos2, Starlette ...). We present a new computation of the degree 2 coefficients of the variable Earth gravity field. This study is based upon the using of (i) new orbit standards, (ii) the GRACE mean gravity field and (iii) Lageos1 data from 1985 until 2004 (merged with Lageos2 data from 1993). These temporal variations of the Earth gravity field can be related to the Earth Orientation Parameters through the inertia tensor. This paper shows these relations and discusses how such geodetic data can contribute to the understanding of the variations in EOP. This paper also studies if these refined 20-yr of Lageos data can give us refined value of the 18.6-yr tidal term, as well as of the secular drift of the C20 geopotential coefficient.
[ { "version": "v1", "created": "Wed, 28 Nov 2007 20:21:10 GMT" } ]
2007-11-29T00:00:00
[ [ "Bourda", "G.", "", "SYRTE" ] ]
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711.4585
Eduardo G. Altmann
E. G. Altmann, T. Friedrich, A. E. Motter, H. Kantz, and A. Richter
Prevalence of marginally unstable periodic orbits in chaotic billiards
6 pages, 5 figures
Phys. Rev. E 77, 016205 (2008)
10.1103/PhysRevE.77.016205
null
nlin.CD quant-ph
null
The dynamics of chaotic billiards is significantly influenced by coexisting regions of regular motion. Here we investigate the prevalence of a different fundamental structure, which is formed by marginally unstable periodic orbits and stands apart from the regular regions. We show that these structures both {\it exist} and {\it strongly influence} the dynamics of locally perturbed billiards, which include a large class of widely studied systems. We demonstrate the impact of these structures in the quantum regime using microwave experiments in annular billiards.
[ { "version": "v1", "created": "Wed, 28 Nov 2007 20:32:50 GMT" } ]
2008-01-24T00:00:00
[ [ "Altmann", "E. G.", "" ], [ "Friedrich", "T.", "" ], [ "Motter", "A. E.", "" ], [ "Kantz", "H.", "" ], [ "Richter", "A.", "" ] ]
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711.4586
Nicholas Ingle
N.J.C. Ingle and I.S. Elfimov
Epitaxial influence on the ferromagnetic semiconducotor EuO
null
Physical Review B, 77, 121202R (2008)
10.1103/PhysRevB.77.121202
null
cond-mat.str-el cond-mat.mtrl-sci
null
From first principles calculations we investigate the electronic structure and the magnetic properties of EuO under hydrostatic and epitaxial forces. There is a complex interdependence of the O 2p and Eu 4f and 5d bands on the magnetism in EuO, and decreasing lattice parameters is an ideal method to increase the Curie temperature, T_c. Compared to hydrostatic pressure, the out-of-plane compensation that is available to epitaxial films influences this increase in T_c, although it is minimized by the small value of poisson's ratio for EuO. We find the semiconducting gap closes at a 6% in-plane lattice compression for epitaxy, at which point a significant conceptual change must occur in the active exchange mechanisms.
[ { "version": "v1", "created": "Wed, 28 Nov 2007 21:39:33 GMT" } ]
2008-03-08T00:00:00
[ [ "Ingle", "N. J. C.", "" ], [ "Elfimov", "I. S.", "" ] ]
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711.4587
Priya Natarajan
Priyamvada Natarajan, Jean-Paul Kneib, Ian Smail, Tommaso Treu, Richard Ellis, Sean Moran, Marceau Limousin and Oliver Czoske
The survival of dark matter halos in the cluster Cl0024+16
35 pages, 7 figures, revised version, accepted by ApJ
Astrophys.J.693:970-983,2009
10.1088/0004-637X/693/1/970
null
astro-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Theories of structure formation in a cold dark matter dominated Universe predict that massive clusters of galaxies assemble from the hierarchical merging of lower mass subhalos. Exploiting strong and weak gravitational lensing signals inferred from panoramic HST imaging data, we present a high resolution reconstruction of the mass distribution in the massive, lensing cluster Cl0024+16. Applying galaxy-galaxy lensing techniques we track the fate of dark matter subhalos as a function of projected cluster-centric radius out to 5 Mpc, well beyond the virial radius. We report the first detection of the statistical lensing signal of dark matter subhalos associated with late-type galaxies in clusters. The mass of a typical dark matter subhalo that hosts an L* galaxy increases with projected cluster-centric radius in line with expectations from the tidal stripping hypothesis. Early-type galaxies appear to be hosted on average in more massive dark matter subhalos compared to late-type galaxies. We interpret our findings as evidence for the active assembly of mass via tidal stripping in galaxy clusters. The mass function of dark matter subhalos as a function of projected cluster-centric radius, is compared with an equivalent mass function derived from clusters in the Millenium Run simulation populated with galaxies using semi-analytic models. The shape of the lensing determined mass functions are in very good agreement with the subhalo mass functions derived from the Millenium Run simulation. However, simulated subhalos appear to be more efficiently stripped than lensing observations suggest. (Abridged)
[ { "version": "v1", "created": "Wed, 28 Nov 2007 21:03:15 GMT" }, { "version": "v2", "created": "Wed, 5 Nov 2008 15:05:55 GMT" } ]
2009-06-23T00:00:00
[ [ "Natarajan", "Priyamvada", "" ], [ "Kneib", "Jean-Paul", "" ], [ "Smail", "Ian", "" ], [ "Treu", "Tommaso", "" ], [ "Ellis", "Richard", "" ], [ "Moran", "Sean", "" ], [ "Limousin", "Marceau", "" ], [ "Czoske", "Oliver", "" ] ]
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711.4588
Andreas Koch
A. Koch, R.M. Rich, D.B. Reitzel, N.F. Martin, R.A. Ibata, S.C. Chapman, S.R. Majewski, M. Mori, Y.-S. Loh, J.C. Ostheimer, M. Tanaka
Kinematic and Chemical constraints on the formation of M31's inner and outer halo
35 pages, 20 figures, accpted to the Astrophysical Journal, revised after referee's comments
null
null
null
astro-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The halo of M31 shows a wealth of substructures that are consistent with satellite accretion. Here we report on kinematic and abundance results from Keck/DEIMOS spectroscopy in the calcium triplet region of over 3500 red giant star candidates along the minor axis and in off-axis spheroid fields of M31. Our data reach out to large radial distances of 160 kpc. The derived velocity distributions show a kinematically cold substructure at 17 kpc that has been reported before. We devise an improved method to measure accurate metallicities from the calcium triplet in low signal-to-noise spectra using a coaddition of the individual lines. The resulting distribution leads us to note an even stronger gradient in the abundance distribution along M31's minor axis than previously detected. The mean metallicity in the outer halo reaches below -2 dex, with individual values as low as -2.6 dex. In the inner spheroid, at 17-19 kpc, we find a sharp decline of ~0.5 dex in metallicity, which roughly coincides with the edge of an extended disk, previously detected from star count maps. A large fraction of red giants in the most distant fields are likely members of M33's overlapping halo. A comparison of our velocities with those predicted by new N-body simulations argues that the event responsible for the giant Stream is most likely not responsible for the full population of the inner halo; we show further that the abundance distribution of the Stream is different from that of the inner halo, from which it becomes evident that the merger event that formed the outer halo cannot have contributed any significant material to the inner spheroid. All this evidence of severe structure changes in the halo suggests a high degree of infall and stochastic abundance accretion governing the build-up of M31's halo. (Abridged)
[ { "version": "v1", "created": "Wed, 28 Nov 2007 21:01:07 GMT" }, { "version": "v2", "created": "Tue, 5 Aug 2008 17:23:49 GMT" } ]
2008-08-05T00:00:00
[ [ "Koch", "A.", "" ], [ "Rich", "R. M.", "" ], [ "Reitzel", "D. B.", "" ], [ "Martin", "N. F.", "" ], [ "Ibata", "R. A.", "" ], [ "Chapman", "S. C.", "" ], [ "Majewski", "S. R.", "" ], [ "Mori", "M.", "" ], [ "Loh", "Y. -S.", "" ], [ "Ostheimer", "J. C.", "" ], [ "Tanaka", "M.", "" ] ]
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711.4589
Andreas Koch
Masao Mori (Senshu University), R. Michael Rich (UCLA)
The Once and Future Andromeda Stream
5 pages, 4 figures, accepted for publication in ApJL; see http://www.isc.senshu-u.ac.jp/~thj0613/M31/M31.html for high-resolution figures and movie
null
10.1086/529140
null
astro-ph
null
The interaction between an accreting satellite and the Andromeda galaxy (M31) has been studied analytically and numerically, using a high-resolution N-body simulation with $4\times10^7$ particles. For the first time, we show the self-gravitating response of the disk, the bulge, and the dark matter halo of M31 to an accreting satellite. We reproduce the Stream and the shells at the East and West side of M31, by following the evolution of the collision 4 Gyr into the future, and show that recently discovered diffuse arcs on the south side of the minor axis are the remnants of a similar collision that occurred 3-4 Gyr earlier than the Stream event. The present day integrity of the M31 disk constrains the satellite mass to be $M \leq 5\times10^9 M_\odot$. The stars that were originally in the center of the satellite are now in the east shell. Therefore, observations in this region might reveal additional clues about the nature of satellite, such as the central core and any metallicity gradient.
[ { "version": "v1", "created": "Wed, 28 Nov 2007 21:08:10 GMT" }, { "version": "v2", "created": "Sat, 1 Dec 2007 16:17:30 GMT" }, { "version": "v3", "created": "Sat, 12 Jan 2008 09:26:41 GMT" } ]
2009-11-13T00:00:00
[ [ "Mori", "Masao", "", "Senshu University" ], [ "Rich", "R. Michael", "", "UCLA" ] ]
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711.459
Sarbani Basu
Sarbani Basu (Yale University), H.M. Antia (Tata Institute, Mumbai)
Helioseismology and Solar Abundances
To appear in Physics Reports. Large file (1.6M PDF, 3.4M PS), 27 figures
Phys.Rept.457:217-283,2008
10.1016/j.physrep.2007.12.002
null
astro-ph
null
Helioseismology has allowed us to study the structure of the Sun in unprecedented detail. One of the triumphs of the theory of stellar evolution was that helioseismic studies had shown that the structure of solar models is very similar to that of the Sun. However, this agreement has been spoiled by recent revisions of the solar heavy-element abundances. Heavy element abundances determine the opacity of the stellar material and hence, are an important input to stellar model calculations. The models with the new, low abundances do not satisfy helioseismic constraints. We review here how heavy-element abundances affect solar models, how these models are tested with helioseismology, and the impact of the new abundances on standard solar models. We also discuss the attempts made to improve the agreement of the low-abundance models with the Sun and discuss how helioseismology is being used to determine the solar heavy-element abundance. A review of current literature shows that attempts to improve agreement between solar models with low heavy-element abundances and seismic inference have been unsuccessful so far. The low-metallicity models that have the least disagreement with seismic data require changing all input physics to stellar models beyond their acceptable ranges. Seismic determinations of the solar heavy-element abundance yield results that are consistent with the older, higher values of the solar abundance, and hence, no major changes to the inputs to solar models are required to make higher-metallicity solar models consistent with helioseismic data.
[ { "version": "v1", "created": "Wed, 28 Nov 2007 21:02:54 GMT" } ]
2009-06-23T00:00:00
[ [ "Basu", "Sarbani", "", "Yale University" ], [ "Antia", "H. M.", "", "Tata Institute, Mumbai" ] ]
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711.4591
Pran Nath
Daniel Feldman, Zuowei Liu and Pran Nath
Light Higgses at the Tevatron and at the LHC and Observable Dark Matter in SUGRA and D Branes
Refs. added in V2, Published in Physics Letters B
Phys.Lett.B662:190-198,2008
10.1016/j.physletb.2008.02.063
null
hep-ph astro-ph
null
Sparticle landscapes in mSUGRA, in SUGRA models with nonuniversalities (NUSUGRA), and in D brane models are analyzed. The analysis exhibits the existence of Higgs Mass Patterns (HPs) (for $\mu>0$) where the CP odd Higgs could be the next heavier particle beyond the LSP and sometimes even lighter than the LSP. It is shown that the Higgs production cross sections from the HPs are typically the largest enhancing the prospects for their detection at the LHC. Indeed it is seen that the recent Higgs production limits from CDF/D\O\ are beginning to put constraints on the HPs. It is also seen that the $B_s\to \mu^+\mu^-$ limits constrain the HPs more stringently. Predictions of the Higgs production cross sections for these patterns at the LHC are made. We compute the neutralino-proton cross sections $\sigma (\chi p)$ for dark matter experiments and show that the largest $\sigma (\chi p)$ also arise from the HPs and further that the HPs and some of the other patterns are beginning to be constrained by the most recent data from CDMS and from Xenon10 experiments. Finally, it is shown that the prospects are bright for the discovery of dark matter with $\sigma(\chi p)$ in the range $10^{-44\pm .5}$cm$^2$ due to a "Wall" consisting of a copious number of parameter points in the Chargino Patterns (CPs) where the chargino is the NLSP. The Wall, which appears in all models considered (mSUGRA, NUSUGRA and D branes) and runs up to about a TeV in LSP mass, significantly enhances the chances for the observation of dark matter by SuperCDMS, ZEPLIN-MAX, or LUX experiments which are expected to achieve a sensitivity of $10^{-45}$ cm$^2$ or more.
[ { "version": "v1", "created": "Thu, 29 Nov 2007 19:32:13 GMT" }, { "version": "v2", "created": "Wed, 2 Apr 2008 20:29:49 GMT" } ]
2008-11-26T00:00:00
[ [ "Feldman", "Daniel", "" ], [ "Liu", "Zuowei", "" ], [ "Nath", "Pran", "" ] ]
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711.4592
Xiaodong Wang
Xiaodong Wang
Harmonic Functions, Entropy, and a Characterization of the Hyperbolic Space
to appear in J. Geom. Anal
null
null
null
math.DG
null
Let $(M^{n},g)$ be a compact Riemannian manifold with $Ric\geq-(n-1) $. It is well known that the bottom of spectrum $\lambda_{0}$ of its unverversal covering satisfies $\lambda_{0}\leq(n-1) ^{2}/4 $. We prove that equality holds iff $M$ is hyperbolic. This follows from a sharp estimate for the Kaimanovich entropy.
[ { "version": "v1", "created": "Wed, 28 Nov 2007 21:07:09 GMT" } ]
2007-11-30T00:00:00
[ [ "Wang", "Xiaodong", "" ] ]
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711.4593
T. L. Trueman
T.L. Trueman
Spin asymmetries for elastic proton scattering and the spin dependent couplings of the Pomeron
final reference modifed
Phys.Rev.D77:054005,2008
10.1103/PhysRevD.77.054005
BNL-HET-07/14
hep-ph nucl-ex
null
This paper serves as a report on the large amount of analysis done in conjunction with the polarized proton program at RHIC. This comprises elastic scattering data of protons on protons in colliding beam or fixed target mode and proton beams on carbon targets. In addition to providing a model for the energy dependence of the analyzing power of elastic scattering needed for proton polarimetry, it also provides some significant information about the spin dependence of dominant Regge poles. Most notably, the data indicates that the Pomeron has a significant spin-flip coupling. This allows the exploration of the double spin flip asymmetry A_{NN} for which some data over a wide energy range is now available, along with a concrete realization of a proposed Odderon search.
[ { "version": "v1", "created": "Wed, 28 Nov 2007 21:07:45 GMT" }, { "version": "v2", "created": "Mon, 10 Dec 2007 17:02:11 GMT" } ]
2008-11-26T00:00:00
[ [ "Trueman", "T. L.", "" ] ]
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711.4594
Khandker Quader
R. Liao, F. Popescu, K. Quader
P-wave Pairing in Two-Component Fermi Systems with Unequal Population near Feshbach Resonance
5 pages, 3 figures
Phys. Rev. B 88, 134507 (2013)
10.1103/PhysRevB.88.134507
null
cond-mat.supr-con cond-mat.other
null
We explore p-wave pairing in a single-channel two-component Fermi system with unequal population near Feshbach resonance. Our analytical and numerical study reveal a rich superfluid (SF) ground state structure as a function of imbalance. In addition to the state $\Delta_{\pm 1} \propto Y_{1\pm 1}$, a multitude of ``mixed'' SF states formed of linear combinations of $Y_{1m}$'s give global energy minimum under a phase stability condition; these states exhibit variation in energy with the relative phase between the constituent gap amplitudes. States with local energy minimum are also obtained. We provide a geometric representation of the states. A $T$=0 polarization vs. p-wave coupling phase diagram is constructed across the BEC-BCS regimes. With increased polarization, the global minimum SF state may undergo a quantum phase transition to the local minimum SF state.
[ { "version": "v1", "created": "Wed, 28 Nov 2007 21:08:20 GMT" } ]
2015-09-01T00:00:00
[ [ "Liao", "R.", "" ], [ "Popescu", "F.", "" ], [ "Quader", "K.", "" ] ]
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711.4595
Xiaodong Wang
Fengbo Hang, Xiaodong Wang
A Rigidity Theorem for the Hemisphere
The extrinsic boundary condition is relaxed
null
null
null
math.DG
null
We prove the following rigidity theorem: For an n-dimensional compact Riemannian manifold with boundary whose Ricci curvature is bounded by n-1 from below, if its boundary is isometric to the standard sphere of dimension n-1 and totally geodesic, then the manifold is isometric to the standard hemisphere.
[ { "version": "v1", "created": "Wed, 28 Nov 2007 21:18:09 GMT" }, { "version": "v2", "created": "Mon, 3 Dec 2007 18:33:16 GMT" } ]
2007-12-03T00:00:00
[ [ "Hang", "Fengbo", "" ], [ "Wang", "Xiaodong", "" ] ]
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711.4596
Gabriele La Spada
Gabriele La Spada, J. Doyne Farmer and Fabrizio Lillo
The non-random walk of stock prices: The long-term correlation between signs and sizes
9 pages, 5 figures, StatPhys23
null
10.1140/epjb/e2008-00244-4
null
q-fin.ST physics.soc-ph
null
We investigate the random walk of prices by developing a simple model relating the properties of the signs and absolute values of individual price changes to the diffusion rate (volatility) of prices at longer time scales. We show that this benchmark model is unable to reproduce the diffusion properties of real prices. Specifically, we find that for one hour intervals this model consistently over-predicts the volatility of real price series by about 70%, and that this effect becomes stronger as the length of the intervals increases. By selectively shuffling some components of the data while preserving others we are able to show that this discrepancy is caused by a subtle but long-range non-contemporaneous correlation between the signs and sizes of individual returns. We conjecture that this is related to the long-memory of transaction signs and the need to enforce market efficiency.
[ { "version": "v1", "created": "Wed, 28 Nov 2007 21:58:46 GMT" }, { "version": "v2", "created": "Mon, 5 May 2008 14:45:20 GMT" } ]
2009-11-13T00:00:00
[ [ "La Spada", "Gabriele", "" ], [ "Farmer", "J. Doyne", "" ], [ "Lillo", "Fabrizio", "" ] ]
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711.4597
Derrick Hart
Derrick Hart, Alex Iosevich
Pinned distance sets, Wolff's exponent in finite fields and improved sum-product estimates
null
null
null
null
math.CA math.CO
null
An analog of the Falconer distance problem in vector spaces over finite fields asks for the threshold $\alpha>0$ such that $|\Delta(E)| \gtrsim q$ whenever $|E| \gtrsim q^{\alpha}$, where $E \subset {\Bbb F}_q^d$, the $d$-dimensional vector space over a finite field with $q$ elements (not necessarily prime). Here $\Delta(E)=\{{(x_1-y_1)}^2+...+{(x_d-y_d)}^2: x,y \in E\}$. The second listed author and Misha Rudnev established the threshold $\frac{d+1}{2}$, and the authors of this paper, Doowon Koh and Misha Rudnev proved that this exponent is sharp in even dimensions. In this paper we improve the threshold to $\frac{d^2}{2d-1}$ under the additional assumption that $E$ has product structure. In particular, we obtain the exponent 4/3, consistent with the corresponding exponent in Euclidean space obtained by Wolff.
[ { "version": "v1", "created": "Wed, 28 Nov 2007 21:24:05 GMT" } ]
2007-11-30T00:00:00
[ [ "Hart", "Derrick", "" ], [ "Iosevich", "Alex", "" ] ]
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711.4598
Oleg Y. Gnedin
Oleg Y. Gnedin, Jose L. Prieto
Dynamical Evolution of Globular Clusters in Hierarchical Cosmology
5 pages, proceedings of IAU 246 "Dynamical Evolution of Dense Stellar Systems", eds. Vesperini, Giersz, Sills
null
10.1017/S1743921308016049
null
astro-ph
null
We probe the evolution of globular clusters that could form in giant molecular clouds within high-redshift galaxies. Numerical simulations demonstrate that the large and dense enough gas clouds assemble naturally in current hierarchical models of galaxy formation. These clouds are enriched with heavy elements from earlier stars and could produce star clusters in a similar way to nearby molecular clouds. The masses and sizes of the model clusters are in excellent agreement with the observations of young massive clusters. Do these model clusters evolve into globular clusters that we see in our and external galaxies? In order to study their dynamical evolution, we calculate the orbits of model clusters using the outputs of the cosmological simulation of a Milky Way-sized galaxy. We find that at present the orbits are isotropic in the inner 50 kpc of the Galaxy and preferentially radial at larger distances. All clusters located outside 10 kpc from the center formed in the now-disrupted satellite galaxies. The spatial distribution of model clusters is spheroidal, with a power-law density profile consistent with observations. The combination of two-body scattering, tidal shocks, and stellar evolution results in the evolution of the cluster mass function from an initial power law to the observed log-normal distribution.
[ { "version": "v1", "created": "Wed, 28 Nov 2007 21:27:00 GMT" } ]
2009-11-13T00:00:00
[ [ "Gnedin", "Oleg Y.", "" ], [ "Prieto", "Jose L.", "" ] ]
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711.4599
Dvira Segal
Lian-Ao Wu and Dvira Segal
How can we derive Fourier's Law from quantum mechanics? Exact master equation analysis
null
Phys. Rev. E 77, 060101R (2008)
10.1103/PhysRevE.77.060101
null
cond-mat.mes-hall cond-mat.stat-mech
null
We derive the macroscopic Fourier's Law of heat conduction from the exact gain-loss time convolutionless quantum master equation under three assumptions for the interaction kernel. To second order in the interaction, we show that the first two assumptions are natural results of the long time limit. The third assumption can be satisfied by a family of interactions consisting an exchange effect. The pure exchange model directly leads to energy diffusion in a weakly coupled spin-1/2 chain.
[ { "version": "v1", "created": "Wed, 28 Nov 2007 21:30:37 GMT" } ]
2015-05-13T00:00:00
[ [ "Wu", "Lian-Ao", "" ], [ "Segal", "Dvira", "" ] ]
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711.46
Bert Schroer
Bert Schroer
Localization and the interface between quantum mechanics, quantum field theory and quantum gravity
70 pages, actualization, addition of references
null
null
null
hep-th gr-qc nucl-th quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We show that there are significant conceptual differences between QM and QFT which make it difficult to view the latter as just a relativistic extension of the principles of QM. At the root of this is a fundamental distinction between Born-localization in QM (which in the relativistic context changes its name to Newton-Wigner localization) and modular localization which is the localization underlying QFT, after one liberates it from its standard presentation in terms of field coordinates. The first comes with a probability notion and projection operators, whereas the latter describes causal propagation in QFT and leads to thermal aspects of locally reduced finite energy states. The Born-Newton-Wigner localization in QFT is only applicable asymptotically and the covariant correlation between asymptotic in and out localization projectors is the basis of the existence of an invariant scattering matrix. Taking these significant differences serious has not only repercussions for the philosophy of science, but also leads to a new structural properties as a consequence of vacuum polarization: the area law for localization entropy near the the causal localization horizon and a more realistic cutoff independent setting for the cosmological vacuum energy density which is compatible with local covariance. The article presents some observations about the interface between QFT in CST and QG.
[ { "version": "v1", "created": "Thu, 29 Nov 2007 19:28:19 GMT" }, { "version": "v2", "created": "Tue, 4 Dec 2007 19:48:29 GMT" }, { "version": "v3", "created": "Thu, 26 Feb 2009 19:42:46 GMT" }, { "version": "v4", "created": "Tue, 26 May 2009 18:23:15 GMT" } ]
2009-05-26T00:00:00
[ [ "Schroer", "Bert", "" ] ]
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711.4601
Mladen Georgiev
Mladen Georgiev
Colossal Van der Waals small-polaron superlattice: a hint to understanding the colossal magnetoresistance and electroresistance in manganites
9 pages including 3(5) figuresq all pdf format
null
null
null
physics.chem-ph
null
A mechanism is proposed to explain the formation of a small-polaron superlattice above the Curie temperature in manganites. The order-disorder transition initiated by the external field at a lattice is known responsible for the colossal resistance effect. We attribute the lattice formation to the occurrence of strong Van der Waals pairing of vibronic small polarons arising from the phonon coupling of highly polarizable two-level orbital systems. The latter having inherent electric and magnetic dipoles associated with them, they couple to the external field leading to the observed colossal effects. We find numerical estimates of the critical field compatible.
[ { "version": "v1", "created": "Wed, 28 Nov 2007 21:39:30 GMT" } ]
2007-11-30T00:00:00
[ [ "Georgiev", "Mladen", "" ] ]
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711.4602
Robert Brandenberger
Andrew Stewart and Robert Brandenberger (McGill University)
Observational Constraints on Theories with a Blue Spectrum of Tensor Modes
12 pages, 1 figure, 2 references added, relationship of this work with Ref. 20 added
JCAP 0808:012,2008
10.1088/1475-7516/2008/08/012
null
astro-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Motivated by the string gas cosmological model, which predicts a blue tilt of the primordial gravitational wave spectrum, we examine the constraints imposed by current and planned observations on a blue tilted tensor spectrum. Starting from an expression for the primordial gravitational wave spectrum normalized using cosmic microwave background observations, pulsar timing, direct detection and nucleosynthesis bounds are examined. If we assume a tensor to scalar ratio on scales of the CMB which equals the current observational upper bound, we obtain from these current observations constraints on the tensor spectral index of $n_{T} \lesssim 0.79$, $n_{T} \lesssim 0.53$, and $n_{T} \lesssim 0.15$ respectively.
[ { "version": "v1", "created": "Wed, 28 Nov 2007 21:58:45 GMT" }, { "version": "v2", "created": "Thu, 26 Jun 2008 14:44:27 GMT" }, { "version": "v3", "created": "Sun, 13 Jul 2008 01:34:46 GMT" } ]
2009-06-23T00:00:00
[ [ "Stewart", "Andrew", "", "McGill University" ], [ "Brandenberger", "Robert", "", "McGill University" ] ]
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711.4603
Salah Aly A
Salah A. Aly
A Note on Quantum Hamming Bound
null
null
null
null
quant-ph cs.IT math.IT
null
Proving the quantum Hamming bound for degenerate nonbinary stabilizer codes has been an open problem for a decade. In this note, I prove this bound for double error-correcting degenerate stabilizer codes. Also, I compute the maximum length of single and double error-correcting MDS stabilizer codes over finite fields.
[ { "version": "v1", "created": "Thu, 29 Nov 2007 19:12:24 GMT" } ]
2011-11-10T00:00:00
[ [ "Aly", "Salah A.", "" ] ]
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711.4604
James Mullaney
James R. Mullaney and Martin J. Ward
Optical emission line properties of Narrow Line Seyfert 1s and comparison AGN
24 pages, 13 figures, 5 tables, Accepted for publication in MNRAS
null
10.1111/j.1365-2966.2007.12777.x
null
astro-ph
null
Based on a new spectroscopic sample observed using the WHT, we examine the kinematic properties of the various emission line regions in narrow line Seyfert 1 galaxies (NLS1s) by modelling their profiles using multiple component fits. We interpret these results by comparison with velocity components observed for different lines species covered in the same spectrum, and equivalent components measured in the spectra of some broad line Seyfert 1s and a representative Seyfert 2 galaxy. We find that the fits to the Halpha and Hbeta line profiles in NLS1s require an additional broad (~3000km/s) component that might correspond to a suppressed broad line region with similar kinematics to those of typical broad line Seyfert 1s. From the profiles of the forbidden high ionisation lines (FHILs) in NLS1s, we find evidence that they appear to trace an `intermediate' velocity region with kinematics between the standard broad and narrow line regions. Weaker evidence of this region is also present in the profiles of the permitted Balmer lines. Finally, we note that despite having similar ionisation potentials, the relative intensities of the highly ionised lines of [Fe X]6374 and [FeXI]7892 show considerable dispersion from one galaxy to another. The interpretation of this requires further modelling, but suggests the possibility of using the ratio as a diagnostic to constrain the physical conditions of the FHIL emitting region and possibly the shape of the spectral energy distribution in the vicinity of 200eV. This spectral region is very difficult to observe directly due to photoelectric absorption both in our Galaxy and intrinsic to the source.
[ { "version": "v1", "created": "Wed, 28 Nov 2007 22:14:05 GMT" } ]
2009-11-13T00:00:00
[ [ "Mullaney", "James R.", "" ], [ "Ward", "Martin J.", "" ] ]
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711.4605
Yancy L. Shirley
Yancy L. Shirley (Bok Fellow, Univ. of Arizona), Jingwen Wu (CfA), R. Shane Bussmann (Univ. of Arizona), and Al Wootten (NRAO)
The Properties of Dense Molecular Gas in the Milky Way and Galaxies
7 pages. To appear in Massive Star Formation: Observations Confront Theory, ed. H. Beuther, ASP Conference Series
null
null
null
astro-ph
null
We review the evidence for a constant star formation rate per unit mass in dense molecular gas in the Milky Way and the extragalactic correlations of L_IR with L' from observations of dense molecular gas. We discuss the connection between the constant SFR/M interpretation in dense gas and the global Schmidt-Kennicutt star formation law.
[ { "version": "v1", "created": "Wed, 28 Nov 2007 22:06:25 GMT" } ]
2007-11-30T00:00:00
[ [ "Shirley", "Yancy L.", "", "Bok Fellow, Univ. of Arizona" ], [ "Wu", "Jingwen", "", "CfA" ], [ "Bussmann", "R. Shane", "", "Univ. of Arizona" ], [ "Wootten", "Al", "", "NRAO" ] ]
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711.4606
Amelia Sparavigna
Amelia Sparavigna
Physics in Carnacki's investigations
8 pages, added references
International Journal of Literature and Arts. Vol. 1, No. 1, 2013, pp. 11-15
10.11648/j.ijla.20130101.13
null
physics.pop-ph
null
In the stories of Carnacki, created by the English writer William H. Hodgson and written between 1910 and 1912, we find an interesting mixture of science and fantasy. In spite of the fact that Carnacki is a ghost finder, who investigates in an environment where supernatural is acting, we see the character using technology and sometimes discussing of physics phenomena such as X-rays. The Carnacki's stories can be seen as mirrors of the physics and technology knowledge at the beginning of Twentieth Century, in the society outside scientific circles.
[ { "version": "v1", "created": "Wed, 28 Nov 2007 22:06:31 GMT" }, { "version": "v2", "created": "Sat, 1 Dec 2007 09:00:01 GMT" }, { "version": "v3", "created": "Fri, 18 Jan 2008 09:54:28 GMT" } ]
2014-01-03T00:00:00
[ [ "Sparavigna", "Amelia", "" ] ]
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711.4607
Yury Kozhedub Sergeevich
Y. S. Kozhedub, O. V. Andreev, V. M. Shabaev, I. I. Tupitsyn, C. Brandau, C. Kozhuharov, G. Plunien, T. Stohlker
Nuclear deformation effect on the binding energies in heavy ions
19 pages, 5 tables
Phys. Rev. A 77, 032501 (2008)
10.1103/PhysRevA.77.032501
null
physics.atom-ph
null
Nuclear deformation effects on the binding energies in heavy ions are investigated. Approximate formulas for the nuclear-size correction and the isotope shift for deformed nuclei are derived. Combined with direct numerical evaluations, these formulas are employed to reanalyse experimental data on the nuclear-charge-distribution parameters in $^{238}\textrm{U}$ and to revise the nuclear-size corrections to the binding energies in H- and Li-like $^{238}\textrm{U}$. As a result, the theoretical uncertainties for the ground-state Lamb shift in $^{238}\textrm{U}^{91+}$ and for the $2p_{1/2}-2s$ transition energy in $^{238}\textrm{U}^{89+}$ are significantly reduced. The isotope shift of the $2p_{j}-2s$ transition energies for $^{142}\textrm{Nd}^{57+}$ and $^{150}\textrm{Nd}^{57+}$ is also evaluated including nuclear size and nuclear recoil effects within a full QED treatment.
[ { "version": "v1", "created": "Wed, 28 Nov 2007 22:08:41 GMT" } ]
2009-11-13T00:00:00
[ [ "Kozhedub", "Y. S.", "" ], [ "Andreev", "O. V.", "" ], [ "Shabaev", "V. M.", "" ], [ "Tupitsyn", "I. I.", "" ], [ "Brandau", "C.", "" ], [ "Kozhuharov", "C.", "" ], [ "Plunien", "G.", "" ], [ "Stohlker", "T.", "" ] ]
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