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711.2008
Tobias Schmidt
Tobias Schmidt
Analytic vectors in continuous p-adic representations
Final version (appeared in Comp. Math. 2009). Exposition shortened. Minor items corrected
null
10.1112/S0010437X08003825
null
math.RT math.NT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Given a compact p-adic Lie group G over a finite unramified extension L/Q_p let G_0 be the product over all Galois conjugates of G. We construct an exact and faithful functor from admissible G-Banach space representations to admissible locally L-analytic G_0-representations that coincides with passage to analytic vectors in case L=Q_p. On the other hand, we study the functor "passage to analytic vectors" and its derived functors over general basefields. As an application we determine the higher analytic vectors in certain locally analytic induced representations.
[ { "version": "v1", "created": "Tue, 13 Nov 2007 15:39:02 GMT" }, { "version": "v2", "created": "Mon, 1 Oct 2012 21:26:02 GMT" } ]
2014-01-14T00:00:00
[ [ "Schmidt", "Tobias", "" ] ]
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711.2009
Mats Granath
M. Granath
Fermi momentum resolved charge order for spin disordered stripes
9 pages, 5 figures, added references and extended discussion of Hall coefficient for stripe ordered system; v3 final, improved figures
Phys. Rev. B 77, 165128 (2008)
10.1103/PhysRevB.77.165128
null
cond-mat.str-el cond-mat.supr-con
null
For a doped antiferromagnet with short-range spin stripe correlations and long-range charge stripe order we find that the manifestation of charge order changes abruptly as a function of momentum along the Fermi surface. The disorder averaged local density of states is almost perfectly homogeneous when integrated only over states which contribute to the ``nodal'' spectral weight whereas it displays long range charge stripe order when integrated only over states which contribute to the ``antinodal'' spectral weight. An effectively two dimensional nodal liquid can thus coexist with static charge stripes provided there is no static spin order. We also study commensurate spin and charge stripe ordered systems where the Fermi surface consists of a nodal hole pocket and an open ``stripe band'' section. Due to the stripe order the relation between hole density and size of a pocket will be reduced compared to a paramagnet by a factor of two for even charge period and four for odd charge period and we find an estimated upper limit on the area fraction of a hole pocket of 1.6% for charge period four and 4% for charge period five. We also discuss why electron pockets are not expected for a stripe ordered system and show that the open Fermi surface section may be electron like with a negative Hall coefficient.
[ { "version": "v1", "created": "Tue, 13 Nov 2007 15:48:37 GMT" }, { "version": "v2", "created": "Thu, 6 Dec 2007 09:39:59 GMT" }, { "version": "v3", "created": "Wed, 23 Apr 2008 06:52:34 GMT" } ]
2008-04-23T00:00:00
[ [ "Granath", "M.", "" ] ]
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711.201
Reiner Czerwinski
Reiner Czerwinski
A Polynomial Time Algorithm for Graph Isomorphism
null
null
null
null
cs.CC
http://creativecommons.org/licenses/by/4.0/
We claimed that there is a polynomial algorithm to test if two graphs are isomorphic. But the algorithm is wrong. It only tests if the adjacency matrices of two graphs have the same eigenvalues. There is a counterexample of two non-isomorphic graphs with the same eigenvalues.
[ { "version": "v1", "created": "Tue, 13 Nov 2007 15:51:33 GMT" }, { "version": "v2", "created": "Wed, 28 Nov 2007 20:23:00 GMT" }, { "version": "v3", "created": "Thu, 13 Dec 2007 14:51:55 GMT" }, { "version": "v4", "created": "Wed, 23 Jan 2008 15:10:16 GMT" }, { "version": "v5", "created": "Sat, 15 Oct 2022 15:56:47 GMT" } ]
2022-10-18T00:00:00
[ [ "Czerwinski", "Reiner", "" ] ]
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711.2011
Zhi-Yong Wang
Zhi-Yong Wang, Cai-Dong Xiong, Bing He
Arrival time in quantum field theory
15 pages, A detailed version with a appendix, to be published in Physics Letters B
Physics Letters B 666 (2008) 382-385
10.1016/j.physletb.2008.07.069
null
quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Via the proper-time eigenstates (event states) instead of the proper-mass eigenstates (particle states), free-motion time-of-arrival theory for massive spin-1/2 particles is developed at the level of quantum field theory. The approach is based on a position-momentum dual formalism. Within the framework of field quantization, the total time-of-arrival is the sum of the single event-of-arrival contributions, and contains zero-point quantum fluctuations because the clocks under consideration follow the laws of quantum mechanics.
[ { "version": "v1", "created": "Tue, 13 Nov 2007 18:13:56 GMT" }, { "version": "v2", "created": "Wed, 30 Jan 2008 16:39:36 GMT" }, { "version": "v3", "created": "Mon, 7 Apr 2008 03:31:54 GMT" }, { "version": "v4", "created": "Mon, 28 Jul 2008 23:57:31 GMT" } ]
2009-11-13T00:00:00
[ [ "Wang", "Zhi-Yong", "" ], [ "Xiong", "Cai-Dong", "" ], [ "He", "Bing", "" ] ]
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711.2012
Ashley Montanaro
Ashley Montanaro
A lower bound on the probability of error in quantum state discrimination
4 pages; v2 fixes typos and adds remarks; v3 adds a new reference
In Proc. IEEE Information Theory Workshop 2008, pp. 378-380
10.1109/ITW.2008.4578690
null
quant-ph
null
We give a lower bound on the probability of error in quantum state discrimination. The bound is a weighted sum of the pairwise fidelities of the states to be distinguished.
[ { "version": "v1", "created": "Tue, 13 Nov 2007 16:04:40 GMT" }, { "version": "v2", "created": "Tue, 11 Mar 2008 08:56:29 GMT" }, { "version": "v3", "created": "Mon, 19 May 2008 08:00:30 GMT" } ]
2016-11-15T00:00:00
[ [ "Montanaro", "Ashley", "" ] ]
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711.2013
Mikhail V. Gorbatenko
M.V.Gorbatenko and G.G.Kochemasov
A Conformally Invariant Approach to Estimation of Relations Between Physical Quantities
null
null
null
null
gr-qc
null
A.V.Pushkin's approach based on conformal geometrodynamics (CGD) to calculation of quantitative relations between physical quantities is presented and analyzed. In the simplest cases of the stationary solutions to the CGD equations the approach implies separation of internal and external parts (relative to a certain boundary) from the solutions and using inverse transformations transforming the parts into each other. For the quasi-stationary (metastable) states, the possibility of the nonperturbative calculation of their lifetimes is shown. The approach is illustrated by several examples. In particular, it is shown that the Dirac ``large number hypothesis'' is a consequence of the approach. Also, the evaluated radiation lifetime of the first excited level of 2p hydrogen atom and neutron lifetime are presented.
[ { "version": "v1", "created": "Tue, 13 Nov 2007 15:59:24 GMT" } ]
2007-11-14T00:00:00
[ [ "Gorbatenko", "M. V.", "" ], [ "Kochemasov", "G. G.", "" ] ]
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711.2014
Giuseppe Nardulli
M. V. Carlucci, F. Giannuzzi, G. Nardulli, M. Pellicoro and S. Stramaglia
AdS-QCD quark-antiquark potential, meson spectrum and tetraquarks
15 pages, 4 figures
Eur.Phys.J.C57:569-578,2008
10.1140/epjc/s10052-008-0687-2
BARI-TH 584-07
hep-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
AdS/QCD correspondence predicts the structure of quark-antiquark potential in the static limit. We use this piece of information together with the Salpeter equation (Schr\"odinger equation with relativistic kinematics) and a short range hyperfine splitting potential to determine quark masses and the quark potential parameters from the meson spectrum. The agreement between theory and experimental data is satisfactory provided one considers only mesons comprising at least one heavy quark. We use the same potential (in the one-gluon-exchange approximation) and these data to estimate constituent diquark masses. Using these results as an input we compute tetraquark masses using a diquark-antidiquark model. The masses of the states X(3872) or Y(3940) are predicted rather accurately. We also compute tetraquark masses with open charm and strangeness. Our result is that tetraquark candidates such as D_s(2317), D_s(2457) or X(2632) can hardly be interpreted as diquark-antidiquark states within the present approach.
[ { "version": "v1", "created": "Tue, 13 Nov 2007 16:01:58 GMT" }, { "version": "v2", "created": "Wed, 23 Jul 2008 13:24:21 GMT" } ]
2009-01-16T00:00:00
[ [ "Carlucci", "M. V.", "" ], [ "Giannuzzi", "F.", "" ], [ "Nardulli", "G.", "" ], [ "Pellicoro", "M.", "" ], [ "Stramaglia", "S.", "" ] ]
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711.2015
Sean Raymond
Sean N. Raymond, Rory Barnes, Avi M. Mandell
Observable Consequences of Planet Formation Models in Systems with Close-in Terrestrial Planets
Accepted to MNRAS. 14 pages, 4 figures, 1 table
null
10.1111/j.1365-2966.2007.12712.x
null
astro-ph
null
To date, two planetary systems have been discovered with close-in, terrestrial-mass planets (< 5-10 Earth masses). Many more such discoveries are anticipated in the coming years with radial velocity and transit searches. Here we investigate the different mechanisms that could form "hot Earths" and their observable predictions. Models include: 1) in situ accretion; 2) formation at larger orbital distance followed by inward "type 1" migration; 3) formation from material being "shepherded" inward by a migrating gas giant planet; 4) formation from material being shepherded by moving secular resonances during dispersal of the protoplanetary disk; 5) tidal circularization of eccentric terrestrial planets with close-in perihelion distances; and 6) photo-evaporative mass loss of a close-in giant planet. Models 1-4 have been validated in previous work. We show that tidal circularization can form hot Earths, but only for relatively massive planets (> 5 Earth masses) with very close-in perihelion distances (< 0.025 AU), and even then the net inward movement in orbital distance is at most only 0.1-0.15 AU. For planets of less than about 70 Earth masses, photo-evaporation can remove the planet's envelope and leave behind the solid core on a Gyr timescale, but only for planets inside 0.025-0.05 AU. Using two quantities that are observable by current and upcoming missions, we show that these models each produce unique signatures, and can be observationally distinguished. These observables are the planetary system architecture (detectable with radial velocities, transits and transit-timing) and the bulk composition of transiting close-in terrestrial planets (measured by transits via the planet's radius).
[ { "version": "v1", "created": "Tue, 13 Nov 2007 16:02:05 GMT" } ]
2009-11-13T00:00:00
[ [ "Raymond", "Sean N.", "" ], [ "Barnes", "Rory", "" ], [ "Mandell", "Avi M.", "" ] ]
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711.2016
Michele Bellazzini
M. Bellazzini (INAF-Oabo)
The Tip of the Red Giant Branch
8 pages, 6 greyscale figures. Invited review. Proceedings of the workshop "XXI Century challenges for stellar evolution", held in Cefalu' (Sicily, Italy), August 29 - September 2, 2007; S. Cassisi and M. Salaris Eds. To be published in Mem. SAIt Vol. 79 No. 2
null
null
null
astro-ph
null
I review the latest results on the calibration of the Tip of the Red Giant Branch as a standard candle, in the optical and in the near infrared. The agreement among different and independent empirical calibrations is rather good, if all the uncertainties are taken into account. The possible extension of the calibration to SDSS photometric bands (i,z) is also discussed.
[ { "version": "v1", "created": "Tue, 13 Nov 2007 16:02:35 GMT" } ]
2007-11-14T00:00:00
[ [ "Bellazzini", "M.", "", "INAF-Oabo" ] ]
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711.2017
Jan Forbrich
Jan Forbrich (1,2), Karl M. Menten (1), and Mark J. Reid (2), ((1) Max-Planck-Institut f\"ur Radioastronomie, Bonn, Germany (2) Harvard-Smithsonian Center for Astrophysics, Cambridge, USA)
A 1.3 cm wavelength radio flare from a deeply embedded source in the Orion BN/KL region
7 pages, 5 figures, accepted for publication in A&A
null
10.1051/0004-6361:20078070
null
astro-ph
null
Aims: Our aim was to measure and characterize the short-wavelength radio emission from young stellar objects (YSOs) in the Orion Nebula Cluster and the BN/KL star-forming region. Methods: We used the NRAO Very Large Array at a wavelength of 1.3 cm and we studied archival X-ray, infrared, and radio data. Results: During our observation, a strong outburst (flux increasing >10 fold) occurred in one of the 16 sources detected at a wavelength of 1.3cm, while the others remained (nearly) constant. This source does not have an infrared counterpart, but has subsequently been observed to flare in X-rays. Curiously, a very weak variable double radio source was found at other epochs near this position, one of whose components is coincident with it. A very high extinction derived from modeling the X-ray emission and the absence of an infrared counterpart both suggest that this source is very deeply embedded.
[ { "version": "v1", "created": "Tue, 13 Nov 2007 16:02:15 GMT" } ]
2009-11-13T00:00:00
[ [ "Forbrich", "Jan", "" ], [ "Menten", "Karl M.", "" ], [ "Reid", "Mark J.", "" ] ]
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711.2018
Michele Maltoni
Michele Maltoni
Sterile neutrinos after the first MiniBooNE results
5 pages, LaTeX file using jpconf style, 3 figures included. Proceedings of "The 2007 Europhysics Conference on High Energy Physics", Manchester, England, July 19-25, 2007. Typos corrected
J.Phys.Conf.Ser.110:082011,2008
10.1088/1742-6596/110/8/082011
IFT-UAM/CSIC-07-59
hep-ph
null
In view of the recent results from the MiniBooNE experiment we revisit the global neutrino oscillation fit to short-baseline neutrino data by adding one, two or three sterile neutrinos with eV-scale masses to the three Standard Model neutrinos. We find that four-neutrino oscillations of the (3+1) type, which have been only marginally allowed before the recent MiniBooNE results, become even more disfavored with the new data. In the framework of so-called (3+2) five-neutrino mass schemes the MiniBooNE results can be nicely reconciled with the LSND appearance evidence thanks to the possibility of CP violation available in such oscillation schemes; however, the tension between appearance and disappearance experiments represents a serious problem in (3+2) schemes, so that these models are ultimately not viable. This tension remains also when a third sterile neutrino is added, and we do not find a significant improvement of the global fit in a (3+3) scheme.
[ { "version": "v1", "created": "Tue, 13 Nov 2007 16:03:42 GMT" }, { "version": "v2", "created": "Tue, 4 Dec 2007 16:13:59 GMT" } ]
2008-11-26T00:00:00
[ [ "Maltoni", "Michele", "" ] ]
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711.2019
Roberto Casadio
Corrado Appignani and Roberto Casadio
Hints of (trans-Planckian) asymptotic freedom in semiclassical cosmology
11 pages, 2 figures; replaced to match content of published version
JCAP0806:014,2008
10.1088/1475-7516/2008/06/014
null
gr-qc hep-th
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We employ the semiclassical approximation to the Wheeler-DeWitt equation in the spatially flat de Sitter Universe to investigate the dynamics of a minimally coupled scalar field near the Planck scale. We find that, contrary to naive intuition, the effects of quantum gravitational fluctuations become negligible and the scalar field states asymptotically approach plane-waves at very early times. These states can then be used as initial conditions for the quantum states of matter to show that each mode essentially originated in the minimum energy vacuum. Although the full quantum dynamics cannot be solved exactly for the case at hand, our results can be considered as supporting the general idea of asymptotic safety in quantum gravity.
[ { "version": "v1", "created": "Tue, 13 Nov 2007 16:09:29 GMT" }, { "version": "v2", "created": "Tue, 15 Apr 2008 18:58:56 GMT" }, { "version": "v3", "created": "Thu, 24 Jul 2008 09:15:28 GMT" } ]
2008-11-07T00:00:00
[ [ "Appignani", "Corrado", "" ], [ "Casadio", "Roberto", "" ] ]
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711.202
Georg Weiglein
T. Hahn, S. Heinemeyer, W. Hollik, H. Rzehak, G. Weiglein and K.E. Williams
CP-violating Loop Effects in the Higgs Sector of the MSSM
5 pages, contribution to the proceedings of LCWS/ILC 2007
ECONF C0705302:HIG19,2007
null
IPPP/07/84, DCPT/07/168
hep-ph
null
CP-violating effects in the Higgs sector of the Minimal Supersymmetric Standard Model with complex parameters (cMSSM) are induced by potentially large higher-order corrections. As a consequence, all three neutral Higgs bosons can mix with each other. Recent results for loop corrections in the Higgs sector of the cMSSM are reviewed. Results for propagator-type corrections of O(alpha_t alpha_s) and complete one-loop results for Higgs cascade decays of the kind h_a -> h_b h_c are summarised, and the proper treatment of external Higgs bosons in Higgs-boson production and decay processes is discussed.
[ { "version": "v1", "created": "Tue, 13 Nov 2007 16:13:38 GMT" } ]
2009-02-16T00:00:00
[ [ "Hahn", "T.", "" ], [ "Heinemeyer", "S.", "" ], [ "Hollik", "W.", "" ], [ "Rzehak", "H.", "" ], [ "Weiglein", "G.", "" ], [ "Williams", "K. E.", "" ] ]
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711.2021
Rigoberto Ju\'arez-Maldonado
Rigoberto Ju\'arez-Maldonado and Magdaleno Medina-Noyola
A New Theory of Dynamic Arrest in Colloidal Mixtures
1 text archive and 7 figures
null
10.1103/PhysRevE.77.051503
null
cond-mat.mtrl-sci
null
We present a new first-principles theory of dynamic arrest in colloidal mixtures based on the multi-component self-consistent generalized Langevin equation (SCGLE) theory of colloid dynamics [Phys. Rev. E {\bf 72}, 031107 (2005); ibid {\bf 76}, 039902 (2007)]. We illustrate its application with the description of dynamic arrest in two simple model colloidal mixtures, namely, the hard-sphere and the repulsive Yukawa binary mixtures. Our results include the observation of the two patterns of dynamic arrest, one in which both species become simultaneously arrested, and the other involving the sequential arrest of the two species. The latter case gives rise to mixed states in which one species is arrested while the other species remains mobile. We also derive the ("fixed point") equations for the non-ergodic parameters of the system, which takes the surprisingly simple form of a system of coupled equations for the localization length of the particles of each species. The solution of this system of equations indicates unambiguously which species is arrested (finite localization length) and which species remains ergodic (infinite localization length). As a result, we are able to draw the entire ergodic--non-ergodic phase diagram of the binary hard-sphere mixture.
[ { "version": "v1", "created": "Tue, 13 Nov 2007 16:15:19 GMT" } ]
2009-11-13T00:00:00
[ [ "Juárez-Maldonado", "Rigoberto", "" ], [ "Medina-Noyola", "Magdaleno", "" ] ]
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711.2022
Igor M. Suslov
A.A.Pogorelov and I.M.Suslov (Kapitza Institute for Physical Problems, Moscow, Russia)
On the Critical Exponents for the \Lambda-Transition in Liquid Helium
PDF, 7 pages
Pis'ma Zh.Eksp.Teor.Fiz., v.86, p.41 (2007) [JETP Letters, v.86, p.39 (2007)]
10.1134/S0021364007130097
null
cond-mat.stat-mech hep-ph hep-th
null
The use of a new method for summing divergent series makes it possible to significantly increase the accuracy of determining the critical exponents from the field theoretical renormalization group. The exponent value \nu=0.6700\pm 0.0006 for the \lambda-transition in liquid helium is in good agreement with the experiment, but contradicts the last theoretical results based on using high-temperature series, the Monte Carlo method, and their synthesis.
[ { "version": "v1", "created": "Tue, 13 Nov 2007 16:22:50 GMT" } ]
2009-11-13T00:00:00
[ [ "Pogorelov", "A. A.", "", "Kapitza Institute for Physical Problems,\n Moscow, Russia" ], [ "Suslov", "I. M.", "", "Kapitza Institute for Physical Problems,\n Moscow, Russia" ] ]
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711.2023
Peter Turney
Peter D. Turney (National Research Council of Canada)
Empirical Evaluation of Four Tensor Decomposition Algorithms
related work available at http://purl.org/peter.turney/
null
null
ERB-1152, NRC-49877
cs.LG cs.CL cs.IR
null
Higher-order tensor decompositions are analogous to the familiar Singular Value Decomposition (SVD), but they transcend the limitations of matrices (second-order tensors). SVD is a powerful tool that has achieved impressive results in information retrieval, collaborative filtering, computational linguistics, computational vision, and other fields. However, SVD is limited to two-dimensional arrays of data (two modes), and many potential applications have three or more modes, which require higher-order tensor decompositions. This paper evaluates four algorithms for higher-order tensor decomposition: Higher-Order Singular Value Decomposition (HO-SVD), Higher-Order Orthogonal Iteration (HOOI), Slice Projection (SP), and Multislice Projection (MP). We measure the time (elapsed run time), space (RAM and disk space requirements), and fit (tensor reconstruction accuracy) of the four algorithms, under a variety of conditions. We find that standard implementations of HO-SVD and HOOI do not scale up to larger tensors, due to increasing RAM requirements. We recommend HOOI for tensors that are small enough for the available RAM and MP for larger tensors.
[ { "version": "v1", "created": "Tue, 13 Nov 2007 16:28:47 GMT" } ]
2007-11-14T00:00:00
[ [ "Turney", "Peter D.", "", "National Research Council of Canada" ] ]
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711.2024
Junfeng Wang
Junfeng Wang, Leisa K. Townsley, Eric D. Feigelson, Patrick S. Broos, Konstantin V. Getman (1), Carlos Roman-Zuniga (2,3), and Elizabeth Lada (3) ((1) Penn State (2) Harvard-Smithsonian Center for Astrophysics (3) University of Florida)
A Chandra Study of the Rosette Star-Forming Complex. I. The Stellar Population and Structure of the Young Open Cluster NGC 2244
Accepted for publication in ApJ (March 1, 2008 v675 issue). 61 pages, 20 figures, 7 tables. Updated a statement on NGC 2244-334 and added a reference
null
10.1086/526406
null
astro-ph
null
We present the first high spatial resolution Chandra X-ray study of NGC 2244, the 2 Myr old stellar cluster immersed in the Rosette Nebula. Over 900 X-ray sources are detected; 77% have optical or FLAMINGOS near-infrared (NIR) stellar counterparts and are mostly previously uncatalogued young stellar cluster members. All known OB stars with spectral type earlier than B1 are detected and the X-ray selected stellar population is estimated to be nearly complete between 0.5 and 3 Msun. The X-ray luminosity function (XLF) ranges from 29.4<logLx<32 ergs/s in the hard (2-8keV) band. By comparing the NGC 2244 and Orion Nebula Cluster XLFs, we estimate a total population of 2000 stars in NGC 2244. A number of further results emerge from our analysis: The XLF and the associated K-band luminosity function indicate a normal Salpeter initial mass function (IMF) for NGC 2244. This is inconsistent with the top-heavy IMF reported from earlier optical studies that lacked a good census of <4Msun stars. The spatial distribution of X-ray stars is strongly concentrated around the central O5 star, HD 46150. The other early O star, HD 46223, has few companions. The cluster's stellar radial density profile shows two distinctive structures. This double structure, combined with the absence of mass segregation, indicates that this cluster is not in dynamical equilibrium. The spatial distribution of X-ray selected K-excess disk stars and embedded stars is asymmetric with an apparent deficit towards the north. The fraction of X-ray-selected cluster members with K-band excesses caused by inner protoplanetary disks is 6%, slightly lower than the 10% disk fraction estimated from the FLAMINGOS study based on the NIR-selected sample. This is due to the high efficiency of X-ray surveys in locating disk-free T Tauri stars.[Abridged]
[ { "version": "v1", "created": "Tue, 13 Nov 2007 16:48:36 GMT" }, { "version": "v2", "created": "Wed, 14 Nov 2007 18:27:34 GMT" } ]
2009-11-13T00:00:00
[ [ "Wang", "Junfeng", "" ], [ "Townsley", "Leisa K.", "" ], [ "Feigelson", "Eric D.", "" ], [ "Broos", "Patrick S.", "" ], [ "Getman", "Konstantin V.", "" ], [ "Roman-Zuniga", "Carlos", "" ], [ "Lada", "Elizabeth", "" ] ]
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711.2025
Jan Perina Jr.
Jan Perina Jr
Quantum properties of counter-propagating two-photon states generated in a planar waveguide
14 pages, 9 figures
Phys. Rev. A 77 (2008) 013803
10.1103/PhysRevA.77.013803
null
quant-ph
null
A nonlinear planar waveguide pumped by a beam orthogonal to its surface may serve as a versatile source of photon pairs. Changing pump-pulse duration, pump-beam transverse width, and angular decomposition of pump-beam frequencies characteristics of a photon pair including spectral widths of signal and idler fields, their time durations as well as degree of entanglement of two fields can be changed significantly. Using the measured spectral widths of the down-converted fields and width of a coincidence-count dip in a Hong-Ou-Mandel interferometer entropy of entanglement can be determined.
[ { "version": "v1", "created": "Tue, 13 Nov 2007 16:35:34 GMT" } ]
2009-11-13T00:00:00
[ [ "Perina", "Jan", "Jr" ] ]
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711.2026
David Shupe
David L. Shupe, Michael Rowan-Robinson, Carol J. Lonsdale, Frank Masci, Tracey Evans, Fan Fang, Sebastian Oliver, Mattia Vaccari, Giulia Rodighiero, Deborah Padgett, Jason A. Surace, C. Kevin Xu, Stefano Berta, Francesca Pozzi, Alberto Franceschini, Thomas Babbedge, Eduardo Gonzales-Solares, Brian D. Siana, Duncan Farrah, David T. Frayer, H. E. Smith, Maria Polletta, Frazer Owen, and Ismael Perez-Fournon
Galaxy Counts at 24 Microns in the SWIRE Fields
10 pages, 8 figures, accepted 3 November 2007 for publication in The Astronomical Journal, formatted with emulateapj style
null
10.1088/0004-6256/135/3/1050
null
astro-ph
null
This paper presents galaxy source counts at 24 microns in the six Spitzer Wide-field InfraRed Extragalactic (SWIRE) fields. The source counts are compared to counts in other fields, and to model predictions that have been updated since the launch of Spitzer. This analysis confirms a very steep rise in the Euclidean-normalized differential number counts between 2 mJy and 0.3 mJy. Variations in the counts between fields show the effects of sample variance in the flux range 0.5-10 mJy, up to 100% larger than Poisson errors. Nonetheless, a "shoulder" in the normalized counts persists at around 3 mJy. The peak of the normalized counts at 0.3 mJy is higher and narrower than most models predict. In the ELAIS N1 field, the 24 micron data are combined with Spitzer-IRAC data and five-band optical imaging, and these bandmerged data are fit with photometric redshift templates. Above 1 mJy the counts are dominated by galaxies at z less than 0.3. By 300 microJy, about 25% are between z ~ 0.3-0.8, and a significant fraction are at z ~ 1.3-2. At low redshifts the counts are dominated by spirals, and starbursts rise in number density to outnumber the spirals' contribution to the counts below 1 mJy.
[ { "version": "v1", "created": "Tue, 13 Nov 2007 18:34:23 GMT" } ]
2009-11-13T00:00:00
[ [ "Shupe", "David L.", "" ], [ "Rowan-Robinson", "Michael", "" ], [ "Lonsdale", "Carol J.", "" ], [ "Masci", "Frank", "" ], [ "Evans", "Tracey", "" ], [ "Fang", "Fan", "" ], [ "Oliver", "Sebastian", "" ], [ "Vaccari", "Mattia", "" ], [ "Rodighiero", "Giulia", "" ], [ "Padgett", "Deborah", "" ], [ "Surace", "Jason A.", "" ], [ "Xu", "C. Kevin", "" ], [ "Berta", "Stefano", "" ], [ "Pozzi", "Francesca", "" ], [ "Franceschini", "Alberto", "" ], [ "Babbedge", "Thomas", "" ], [ "Gonzales-Solares", "Eduardo", "" ], [ "Siana", "Brian D.", "" ], [ "Farrah", "Duncan", "" ], [ "Frayer", "David T.", "" ], [ "Smith", "H. E.", "" ], [ "Polletta", "Maria", "" ], [ "Owen", "Frazer", "" ], [ "Perez-Fournon", "Ismael", "" ] ]
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711.2027
Luigi Iapichino
L. Iapichino, M. Br\"uggen, W. Hillebrandt, J. C. Niemeyer
The ignition process in type Ia supernovae: numerical simulations of core temperature perturbations
4 pages, 2 figures, proceedings of the Catania Workshop on Nuclear and Neutrino Astrophysics (WNNA 2007)
null
null
null
astro-ph
null
The onset of the thermonuclear runaway in a Chandrasekhar-mass white dwarf, leading to the explosion as a type Ia supernova, is studied with hydrodynamical simulations. We investigate the evolution of temperature fluctuations (``bubbles'') in the WD's convective core by means of 2D numerical simulations. We show how the occurrence of the thermonuclear runaway depends on various bubble parameters. The relevance of the progenitor's composition for the ignition process is also discussed.
[ { "version": "v1", "created": "Tue, 13 Nov 2007 16:46:20 GMT" } ]
2007-11-14T00:00:00
[ [ "Iapichino", "L.", "" ], [ "Brüggen", "M.", "" ], [ "Hillebrandt", "W.", "" ], [ "Niemeyer", "J. C.", "" ] ]
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711.2028
Paulo C. Freire
Paulo C. C. Freire, Scott M. Ransom, Steve Begin, Ingrid H. Stairs, Jason W. T. Hessels, Lucille H. Frey, Fernando Camilo
Eight new MSPs in NGC 6440 and NGC 6441
3 pages, 3 figures. To appear in the proceedings of "40 Years of Pulsars: Millisecond Pulsars, Magnetars, and More", August 12-17, 2007, McGill University, Montreal, Canada
AIPConf.Proc.983:604-606,2008
10.1063/1.2900307
null
astro-ph
null
We report the discovery of five new millisecond pulsars in the globular cluster NGC 6440 and three new ones in NGC 6441; each cluster has one previously known pulsar. Four of the new pulsars are found in binary systems. One of the new pulsars, PSR J1748-2021B in NGC 6440, is notable for its eccentric (e = 0.57) and wide (P_b = 20.5 days) orbit. If the rate of advance of periastron is due solely to general relativity, we can estimate of the total mass of this binary system: 2.92 +/- 0.20 solar masses. This would imply an anomalously large mass for this pulsar, which could introduce important constraints in the study of the equation of state for cold neutron matter.
[ { "version": "v1", "created": "Tue, 13 Nov 2007 18:14:11 GMT" } ]
2008-11-26T00:00:00
[ [ "Freire", "Paulo C. C.", "" ], [ "Ransom", "Scott M.", "" ], [ "Begin", "Steve", "" ], [ "Stairs", "Ingrid H.", "" ], [ "Hessels", "Jason W. T.", "" ], [ "Frey", "Lucille H.", "" ], [ "Camilo", "Fernando", "" ] ]
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711.2029
Bertrand Georgeot
J. Martin, O. Giraud and B. Georgeot
Multifractality and intermediate statistics in quantum maps
4 pages, 4 figures
Phys. Rev. E 77, 035201(R) (2008)
10.1103/PhysRevE.77.035201
null
nlin.CD cond-mat.mes-hall
null
We study multifractal properties of wave functions for a one-parameter family of quantum maps displaying the whole range of spectral statistics intermediate between integrable and chaotic statistics. We perform extensive numerical computations and provide analytical arguments showing that the generalized fractal dimensions are directly related to the parameter of the underlying classical map, and thus to other properties such as spectral statistics. Our results could be relevant for Anderson and quantum Hall transitions, where wave functions also show multifractality.
[ { "version": "v1", "created": "Tue, 13 Nov 2007 16:56:06 GMT" } ]
2008-03-18T00:00:00
[ [ "Martin", "J.", "" ], [ "Giraud", "O.", "" ], [ "Georgeot", "B.", "" ] ]
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711.203
Bernhard Urbaszek
Thierry Amand, Xavier Marie
Exciton Spin Dynamics in Semiconductor Quantum Wells
55 pages, 27 figures
null
10.1007/978-3-540-78820-1_3
null
cond-mat.other
null
In this paper we will review Exciton Spin Dynamics in Semiconductor Quantum Wells. The spin properties of excitons in nanostructures are determined by their fine structure. We will mainly focus in this review on GaAs and InGaAs quantum wells which are model systems.
[ { "version": "v1", "created": "Tue, 13 Nov 2007 16:26:16 GMT" } ]
2009-11-13T00:00:00
[ [ "Amand", "Thierry", "" ], [ "Marie", "Xavier", "" ] ]
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711.2031
Artur Ankowski
Artur M. Ankowski, Jan T. Sobczyk
Construction of spectral functions for medium nuclei
16 pages, 16 figures, 4 tables; real part of the optical potential included in description of final-state interactions
Phys.Rev.C77:044311,2008
10.1103/PhysRevC.77.044311
null
nucl-th
null
This article is aimed at improving the description of lepton-nucleus interactions in the sub-GeV energy range. Approximate spectral functions for oxygen, calcium, and argon are constructed and used to obtain the electron cross sections in a given scattering angle. Comparison with a sample of available experimental data shows satisfactory agreement. Discrepancy between the presented model and the systematic computations available for oxygen [O. Benhar et al., Phys. Rev. D 72, 053005 (2005)] is also found to be very small. Analysis of appropriate kinematical regions leads to the conclusion that the obtained argon spectral function should describe well neutrino scattering in the 800-MeV energy region. Several approximations used in the model are critically reviewed. All the details needed to implement the presented approach in Monte Carlo simulations are given.
[ { "version": "v1", "created": "Tue, 13 Nov 2007 17:02:30 GMT" }, { "version": "v2", "created": "Wed, 16 Apr 2008 09:21:58 GMT" } ]
2008-11-26T00:00:00
[ [ "Ankowski", "Artur M.", "" ], [ "Sobczyk", "Jan T.", "" ] ]
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711.2032
Vern Paulsen
Kenneth R. Davidson, Vern I. Paulsen, Mrinal Raghupathi, Dinesh Singh
A Constrained Nevanlinna-Pick Interpolation Problem
null
null
null
null
math.OA
null
We obtain necessary and sufficient conditions for Nevanlinna-Pick interpolation on the unit disk with the additional restriction that all analytic interpolating functions satisfy $f'(0)=0.$ Alternatively, these results can be interpreted as interpolation results for $H^{\infty}(V),$ where $V$ is the intersection of the bidisk with an algebraic variety. We use an analysis of C*-envelopes to show that these same conditions do not suffice for matrix interpolation.
[ { "version": "v1", "created": "Tue, 13 Nov 2007 17:04:25 GMT" } ]
2007-11-14T00:00:00
[ [ "Davidson", "Kenneth R.", "" ], [ "Paulsen", "Vern I.", "" ], [ "Raghupathi", "Mrinal", "" ], [ "Singh", "Dinesh", "" ] ]
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711.2033
David Delphenich
David Delphenich
Transverse geometry and physical observers
23 pages, no figures
null
null
null
gr-qc
null
It is proposed that the mathematical formalism that is most appropriate for the study of spatially non-integrable cosmological models is the transverse geometry of a one-dimensional foliation (congruence) defined by a physical observer. By that means, one can discuss the geometry of space, as viewed by that observer, without the necessity of introducing a complementary sub-bundle to the line bundle of the observer or a codimension-one foliation transverse to the foliation of the observer. The concept of groups of transverse isometries acting on such a spacetime and the relationship of transverse geometry to spacetime threadings (1+3 decompositions) is also discussed.
[ { "version": "v1", "created": "Tue, 13 Nov 2007 17:16:11 GMT" } ]
2007-11-14T00:00:00
[ [ "Delphenich", "David", "" ] ]
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711.2034
Adam D. Myers
Volodymyr V. Kindratenko (UIUC and NCSA), Robert J. Brunner (UIUC and NCSA), Adam D. Myers (UIUC)
Dynamic load-balancing on multi-FPGA systems: a case study
On speeding up 2PCF calculations using field-programmable gate arrays, appeared in Proc. 3rd Annual Reconfigurable Systems Summer Institute - RSSI'07, 2007, 8 pages
null
null
null
astro-ph
null
In this case study, we investigate the impact of workload balance on the performance of multi-FPGA codes. We start with an application in which two distinct kernels run in parallel on two SRC-6 MAP processors. We observe that one of the MAP processors is idle 18% of the time while the other processor is fully utilized. We investigate a task redistribution schema which serializes the execution of the two kernels, yet parallelizes execution of each individual kernel by spreading the workload between two MAP processors. This implementation results in a near 100% utilization of both MAP processors and the overall application performance is improved by 9%.
[ { "version": "v1", "created": "Tue, 13 Nov 2007 17:16:13 GMT" } ]
2007-11-14T00:00:00
[ [ "Kindratenko", "Volodymyr V.", "", "UIUC and NCSA" ], [ "Brunner", "Robert J.", "", "UIUC and\n NCSA" ], [ "Myers", "Adam D.", "", "UIUC" ] ]
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711.2035
Teake Nutma
Eric Bergshoeff, Joaquim Gomis, Teake Nutma, Diederik Roest
Kac-Moody Spectrum of (Half-)Maximal Supergravities
Added references, published version
JHEP0802:069,2008
10.1088/1126-6708/2008/02/069
UG-07-06, UB-ECM-PF-07/24, CERN-PH-TH/2007-165
hep-th
null
We establish the correspondence between, on one side, the possible gaugings and massive deformations of half-maximal supergravity coupled to vector multiplets and, on the other side, certain generators of the associated very extended Kac-Moody algebras. The difference between generators associated to gaugings and to massive deformations is pointed out. Furthermore, we argue that another set of generators are related to the so-called quadratic constraints of the embedding tensor. Special emphasis is placed on a truncation of the Kac-Moody algebra that is related to the bosonic gauge transformations of supergravity. We give a separate discussion of this truncation when non-zero deformations are present. The new insights are also illustrated in the context of maximal supergravity.
[ { "version": "v1", "created": "Tue, 13 Nov 2007 17:20:46 GMT" }, { "version": "v2", "created": "Tue, 4 Mar 2008 10:35:43 GMT" } ]
2008-11-26T00:00:00
[ [ "Bergshoeff", "Eric", "" ], [ "Gomis", "Joaquim", "" ], [ "Nutma", "Teake", "" ], [ "Roest", "Diederik", "" ] ]
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711.2036
Matilde Marcolli
Matilde Marcolli (MPI)
Solvmanifolds and noncommutative tori with real multiplication
40 pages, LaTeX
null
null
null
math.QA
null
We prove that the Shimizu L-function of a real quadratic field is obtained from a (Lorentzian) spectral triple on a noncommutative torus with real multiplication, as an adiabatic limit of the Dirac operator on a 3-dimensional solvmanifold. The Dirac operator on this 3-dimensional geometry gives, via the Connes-Landi isospectral deformations, a spectral triple for the noncommutative tori obtained by deforming the fiber tori to noncommutative spaces. The 3-dimensional solvmanifold is the homotopy quotient in the sense of Baum--Connes of the noncommutative space obtained as the crossed product of the noncommutative torus by the action of the units of the real quadratic field. This noncommutative space is identified with the twisted group C*-algebra of the fundamental group of the 3-manifold. The twisting can be interpreted as the cocycle arising from a magnetic field, as in the theory of the quantum Hall effect. We prove a twisted index theorem that computes the range of the trace on the K-theory of this noncommutative space and gives an estimate on the gaps in the spectrum of the associated Harper operator.
[ { "version": "v1", "created": "Tue, 13 Nov 2007 17:21:12 GMT" } ]
2007-11-14T00:00:00
[ [ "Marcolli", "Matilde", "", "MPI" ] ]
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711.2037
Thomas Dean
Thomas Dean and Paul Dupuis
Splitting for Rare Event Simulation: A Large Deviation Approach to Design and Analysis
Submitted to Stochastic Processes and their Applications
null
null
null
math.PR
null
Particle splitting methods are considered for the estimation of rare events. The probability of interest is that a Markov process first enters a set $B$ before another set $A$, and it is assumed that this probability satisfies a large deviation scaling. A notion of subsolution is defined for the related calculus of variations problem, and two main results are proved under mild conditions. The first is that the number of particles generated by the algorithm grows subexponentially if and only if a certain scalar multiple of the importance function is a subsolution. The second is that, under the same condition, the variance of the algorithm is characterized (asymptotically) in terms of the subsolution. The design of asymptotically optimal schemes is discussed, and numerical examples are presented.
[ { "version": "v1", "created": "Tue, 13 Nov 2007 17:27:10 GMT" } ]
2007-11-14T00:00:00
[ [ "Dean", "Thomas", "" ], [ "Dupuis", "Paul", "" ] ]
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711.2038
Brett D. Altschul
Brett Altschul
Astrophysical Bounds on the Photon Charge and Magnetic Moment
17 pages
Astropart.Phys.29:290-298,2008
10.1016/j.astropartphys.2008.02.006
null
hep-th
null
If the photon possessed an electric charge or a magnetic moment, light waves propagating through magnetic fields would acquire new quantum mechanical phases. For a charged photon, this is an Aharonov-Bohm phase, and the fact that we can resolve distant galaxies using radio interferometry indicates that this phase must be small. This in turn constrains the photon charge to be smaller that 10^(-32) e if all photons have the same charge and smaller than 10^(-46) e if there are both positively and negatively charged photons. The best bound on the magnetic moment comes from the observed absence of wavelength-independent photon birefringence. Birefringence measurements, which compare the relative phases of right- and left-circularly polarized waves, restrict the magnetic moment to be less than 10^(-24) e cm. This is just a few orders of magnetude weaker than the experimental bounds on the electron and neutron electric dipole moments.
[ { "version": "v1", "created": "Tue, 13 Nov 2007 17:31:59 GMT" } ]
2008-11-26T00:00:00
[ [ "Altschul", "Brett", "" ] ]
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711.2039
Agnes Kim
A. Bischoff-Kim, M.H. Montgomery, D.E. Winget
Fine Grid Asteroseismology of R548 and G117-B15A
The first author would love to hear from you if you found this paper interesting. email [email protected]
null
10.1086/527287
null
astro-ph
null
We now have a good measurement of the cooling rate of G117-B15A. In the near future, we will have equally well determined cooling rates for other pulsating white dwarfs, including R548. The ability to measure their cooling rates offers us a unique way to study weakly interacting particles that would contribute to their cooling. Working toward that goal, we perform a careful asteroseismological analysis of G117-B15A and R548. We study them side by side because they have similar observed properties. We carry out a systematic, fine grid search for best fit models to the observed period spectra of those stars. We freely vary 4 parameters: the effective temperature, the stellar mass, the helium layer mass, and the hydrogen layer mass. We identify and quantify a number of uncertainties associated with our models. Based on the results of that analysis and fits to the periods observed in R548 and G117-B15A, we clearly define the regions of the 4 dimensional parameter space ocuppied by the best fit models.
[ { "version": "v1", "created": "Tue, 13 Nov 2007 17:32:38 GMT" } ]
2009-11-13T00:00:00
[ [ "Bischoff-Kim", "A.", "" ], [ "Montgomery", "M. H.", "" ], [ "Winget", "D. E.", "" ] ]
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711.204
Alexey Yamilov
Alexey G. Yamilov, Mark R. Herrera and Massimo F. Bertino
Slow-light effect in dual-periodic photonic lattice
10 pages, 6 figures
null
10.1364/JOSAB.25.000599
null
physics.optics
null
We present analytical and numerical study of photonic lattice with short- and long-range harmonic modulations of the refractive index. Such structures can be prepared experimentally with holographic photolithography. In the spectral region of photonic bandgap of the underlying single-periodic crystal, we observe a series of bands with anomalously small dispersion. The related slow-light effect is attributed to the long-range modulation in the photonic lattice, that leads to formation of an array of evanescently-coupled high-$Q$ cavities. The band structure of the lattice is studied with several techniques: (i) transfer matrix approach; (ii) analysis of resonant coupling in process of band folding; (iii) effective medium approach based on coupled-mode theory; and (iv) Bogolyubov-Mitropolsky approach. The latter method, commonly used in the studies of nonlinear oscillators, was employed to investigate the behavior of the eigen-function envelopes and the band structure of our dual-periodic photonic lattice. We show that reliable results can be obtained even in the case of large refractive index modulation.
[ { "version": "v1", "created": "Tue, 13 Nov 2007 20:51:49 GMT" } ]
2009-11-13T00:00:00
[ [ "Yamilov", "Alexey G.", "" ], [ "Herrera", "Mark R.", "" ], [ "Bertino", "Massimo F.", "" ] ]
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711.2041
Agnes Kim
A. Bischoff-Kim, M.H. Montgomery, D.E. Winget
Strong limits on the DFSZ axion mass with G117-B15A
The first author would love to hear from you if you found this paper interesting. email [email protected]
null
10.1086/526398
null
astro-ph
null
We compute rates of period change (Pdots) for the 215s mode in G117-B15A and the 213s mode in R548, first for models without axions, and then for models with axions of increasing mass. We use the asteroseismological models for G117-B15A and R548 we derived in an earlier publication . For G117-B15A, we consider two families of solutions, one with relatively thick hydrogen layers and one with thin hydrogen layers. Given the region of parameter space occupied by our models, we estimate error bars on the calculated Pdots using Monte Carlo simulations. Together with the observed Pdot for G117-B15A, our analysis yields strong limits on the DFSZ axion mass. Our thin hydrogen solutions place an upper limit of 13.5 meV on the axion, while our thick hydrogen solutions relaxes that limit to 26.5 meV.
[ { "version": "v1", "created": "Tue, 13 Nov 2007 17:52:20 GMT" } ]
2009-11-13T00:00:00
[ [ "Bischoff-Kim", "A.", "" ], [ "Montgomery", "M. H.", "" ], [ "Winget", "D. E.", "" ] ]
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711.2042
Eckhard Sutorius
Eckhard Sutorius (1), Johann Bryant (1), Ross Collins (1), Nicholas Cross (1), Nigel Hambly (1), Mike Read (1) ((1) Scottish Universities Physics Alliance (SUPA), Institute for Astronomy, School of Physics, University of Edinburgh, UK)
A pseudo-parallel Python environment for database curation
4 pages, 2 figures, ADASS XVII conference proceeding. ASP conference series
null
null
null
astro-ph
null
One of the major challenges providing large databases like the WFCAM Science Archive (WSA) is to minimize ingest times for pixel/image metadata and catalogue data. In this article we describe how the pipeline processed data are ingested into the database as the first stage in building a release database which will be succeeded by advanced processing (source merging, seaming, detection quality flagging etc.). To accomplish the ingestion procedure as fast as possible we use a mixed Python/C++ environment and run the required tasks in a simple parallel modus operandi where the data are split into daily chunks and then processed on different computers. The created data files can be ingested into the database immediately as they are available. This flexible way of handling the data allows the most usage of the available CPUs as the comparison with sequential processing shows.
[ { "version": "v1", "created": "Tue, 13 Nov 2007 18:22:18 GMT" } ]
2007-11-14T00:00:00
[ [ "Sutorius", "Eckhard", "" ], [ "Bryant", "Johann", "" ], [ "Collins", "Ross", "" ], [ "Cross", "Nicholas", "" ], [ "Hambly", "Nigel", "" ], [ "Read", "Mike", "" ] ]
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711.2043
Yvette Kosmann-Schwarzbach
Yvette Kosmann-Schwarzbach
Poisson and symplectic functions in Lie algebroid theory
Dedicated to Murray Gerstenhaber and Jim Stasheff, 27 pages, to appear in Progress in Math.; editorial changes, one reference added; v4: change of convention for bidegree
Higher Structures in Geometry and Physics, Cattaneo, Giaquinto and P. Xu, eds., 2011, 243-268
null
null
math.SG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Emphasizing the role of Gerstenhaber algebras and of higher derived brackets in the theory of Lie algebroids, we show that the several Lie algebroid brackets which have been introduced in the recent literature can all be defined in terms of Poisson and pre-symplectic functions in the sense of Roytenberg and Terashima. We prove that in this very general framework there exists a one-to-one correspondence between non-degenerate Poisson functions and symplectic functions. We determine the differential associated to a Lie algebroid structure obtained by twisting a structure with background by both a Lie bialgebra action and a Poisson bivector.
[ { "version": "v1", "created": "Tue, 13 Nov 2007 17:56:53 GMT" }, { "version": "v2", "created": "Tue, 15 Apr 2008 14:45:56 GMT" }, { "version": "v3", "created": "Sun, 29 Jun 2008 21:35:00 GMT" }, { "version": "v4", "created": "Sun, 28 Dec 2008 19:44:40 GMT" } ]
2012-12-05T00:00:00
[ [ "Kosmann-Schwarzbach", "Yvette", "" ] ]
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711.2044
Maria Vittoria Garzelli
G. Battistoni, F. Cerutti, A. Fass\`o, A. Ferrari, M.V. Garzelli, M. Lantz, S. Muraro, L.S. Pinsky, J. Ranft, S. Roesler, P.R. Sala
Secondary Cosmic Ray particles due to GCR interactions in the Earth's atmosphere
7 pages, 3 figures. Proceedings of an invited talk presented by M.V. Garzelli at CSSP07, Carpathian Summer School of Physics - Exotic Nuclei & Nuclear/Particle Astrophysics, Sinaia, Romania, August 20 - 31 2007
AIP Conf.Proc.972:449-454,2008
10.1063/1.2870386
null
astro-ph
null
Primary GCR interact with the Earth's atmosphere originating atmospheric showers, thus giving rise to fluxes of secondary particles in the atmosphere. Electromagnetic and hadronic interactions interplay in the production of these particles, whose detection is performed by means of complementary techniques in different energy ranges and at different depths in the atmosphere, down to the Earth's surface. Monte Carlo codes are essential calculation tools which can describe the complexity of the physics of these phenomena, thus allowing the analysis of experimental data. However, these codes are affected by important uncertainties, concerning, in particular, hadronic physics at high energy. In this paper we shall report some results concerning inclusive particle fluxes and atmospheric shower properties as obtained using the FLUKA transport and interaction code. Some emphasis will also be given to the validation of the physics models of FLUKA involved in these calculations.
[ { "version": "v1", "created": "Tue, 13 Nov 2007 18:30:24 GMT" } ]
2009-07-14T00:00:00
[ [ "Battistoni", "G.", "" ], [ "Cerutti", "F.", "" ], [ "Fassò", "A.", "" ], [ "Ferrari", "A.", "" ], [ "Garzelli", "M. V.", "" ], [ "Lantz", "M.", "" ], [ "Muraro", "S.", "" ], [ "Pinsky", "L. S.", "" ], [ "Ranft", "J.", "" ], [ "Roesler", "S.", "" ], [ "Sala", "P. R.", "" ] ]
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711.2045
Paulina Lira
P.Lira (UChile), V.Gonzalez-Corvalan (UChile/USCS), M.Ward (Durham), S.Hoyer (UChile)
An infrared study of the double nucleus in NGC3256
Accepted for publication (MNRAS)
null
10.1111/j.1365-2966.2007.12705.x
null
astro-ph
null
We present new resolved near and mid-IR imaging and N-band spectroscopy of the two nuclei in the merger system NGCA3256, the most IR luminous galaxy in the nearby universe. The results from the SED fit to the data are consistent with previous estimates of the amount of obscuration towards the nuclei and the nuclear star formation rates. However, we also find substantial differences in the infrared emission from the two nuclei which cannot be explained by obscuration alone. We conclude that the northern nucleus requires an additional component of warm dust in order to explain its properties. This suggests that local starforming conditions can vary significantly within the environment of a single system.
[ { "version": "v1", "created": "Tue, 13 Nov 2007 18:41:56 GMT" } ]
2009-11-13T00:00:00
[ [ "Lira", "P.", "", "UChile" ], [ "Gonzalez-Corvalan", "V.", "", "UChile/USCS" ], [ "Ward", "M.", "", "Durham" ], [ "Hoyer", "S.", "", "UChile" ] ]
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711.2046
Kaushik Bhattacharya
Alberto Bravo Garcia, Kaushik Bhattacharya, Sarira Sahu
Neutrino self-energy in a magnetized charge-symmetric medium
6 pages, 1 figure. To appear in the conference proceedings of the XI Mexican workshop on particles and fields 2007
AIPConf.Proc.1026:121-126,2008
10.1063/1.2965033
null
hep-ph
null
In this talk we present the calculation of the neutrino self-energy in presence of a magnetized medium. The magnetized medium consists of electrons, positrons, neutrinos and a uniform classical magnetic field. The background magnetic field is assumed to be weak compared to the $W$-Boson mass as a consequence of which only linear order corrections in the field are included in the $W$ boson propagator. The electron propagator consists all order corrections in the background field. Our calculation is specifically suited for situations where the background plasma may be CP symmetric.
[ { "version": "v1", "created": "Tue, 13 Nov 2007 18:43:10 GMT" }, { "version": "v2", "created": "Fri, 21 Dec 2007 20:07:37 GMT" } ]
2008-11-26T00:00:00
[ [ "Garcia", "Alberto Bravo", "" ], [ "Bhattacharya", "Kaushik", "" ], [ "Sahu", "Sarira", "" ] ]
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711.2047
Arafat Gabareen Mokhtar
The BABAR Collaboration: B. Aubert, et al
Observation of Y(3940) -> J/psi omega in B -> J/psi omega K at BABAR
Published: Phys. Rev. Lett. 101, 082001 (2008)
Phys.Rev.Lett.101:082001,2008
10.1103/PhysRevLett.101.082001
null
hep-ex
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We present a study of the decays $B^{0,+}\to J/\psi\omega K^{0,+}$ using $383\times 10^{6}$ $B\bar{B}$ events obtained with the \babar detector at PEP-II. We observe $Y(3940) \to J/\psi \omega$, with mass $3914.6 ^{+3.8}_{-3.4} (stat) \pm{2.0} (syst)$ \mevcc, and width $34^{+12}_{-8}(stat)\pm{5}(syst)$ \mev. The ratio of $B^0$ and $B^+$ decay to $YK$ is $0.27^{+0.28}_{-0.23}(stat)^{+0.04}_{-0.01}(syst)$, and the relevant $B^0$ and $B^+$ branching fractions are reported.
[ { "version": "v1", "created": "Tue, 13 Nov 2007 18:48:40 GMT" }, { "version": "v2", "created": "Wed, 16 Apr 2008 17:47:20 GMT" }, { "version": "v3", "created": "Mon, 22 Sep 2008 19:10:14 GMT" } ]
2010-04-12T00:00:00
[ [ "The BABAR Collaboration", "", "" ], [ "Aubert", "B.", "" ] ]
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711.2048
David Richards
David Richards
Nucleon Structure from Lattice QCD
6 pages, invited plenary talk at NSTAR 2007, 5-8 September 2007, Bonn, Germany
null
10.1007/978-3-540-85144-8_8
JLAB-THY-07-748
nucl-th hep-lat
null
Recent advances in lattice field theory, in computer technology and in chiral perturbation theory have enabled lattice QCD to emerge as a powerful quantitative tool in understanding hadron structure. I describe recent progress in the computation of the nucleon form factors and moments of parton distribution functions, before proceeding to describe lattice studies of the Generalized Parton Distributions (GPDs). In particular, I show how lattice studies of GPDs contribute to building a three-dimensional picture of the proton. I conclude by describing the prospects for studying the structure of resonances from lattice QCD.
[ { "version": "v1", "created": "Tue, 13 Nov 2007 20:01:42 GMT" } ]
2015-05-13T00:00:00
[ [ "Richards", "David", "" ] ]
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711.2049
Denis Gonta
D. Gonta, and S. Fritzsche
The role of the atom-cavity detuning in bimodal cavity experiments
IOP file, 6 figures, J. Phys. B accepted
J. Phys. B: At. Mol. Opt. Phys. 41 (2008) 095503.
10.1088/0953-4075/41/9/095503
null
quant-ph
null
The coherent evolution of the atom-cavity state in bimodal (cavity) experiments has been analyzed for a realistic time-dependence in detuning the atomic transition frequency. Apart from a `smooth switch' of the atomic resonance from one to the second mode of a bimodal cavity, we considered also an additional (effective) interaction between the field modes of the cavity, known as `communication channel'. Comparison of our model computations has been made especially with the measurements by Rauschenbeutel et al., [2001 Phys. Rev. A 64 050301] who demonstrated for the first time the entanglement of the field modes in a bimodal cavity. It is shown that the agreement between the (theoretically) predicted and experimental phase shifts can be improved by allowing a `communication' between the two field modes during a short but finite switch of the atomic transition frequency from one mode to the other. We therefore suggest that the details of the atom-cavity detuning should be taken into account for the future interpretation of bimodal cavity experiments.
[ { "version": "v1", "created": "Tue, 13 Nov 2007 19:02:39 GMT" }, { "version": "v2", "created": "Tue, 1 Apr 2008 06:48:51 GMT" } ]
2009-11-13T00:00:00
[ [ "Gonta", "D.", "" ], [ "Fritzsche", "S.", "" ] ]
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711.205
Hacene Belbachir
Kenza Guenda
Two Families of Quantum Codes Derived from Cyclic Codes
null
null
null
null
cs.IT math.IT
null
We characterize the affine-invariant maximal extended cyclic codes. Then by the CSS construction, we derive from these codes a family of pure quantum codes. Also for ordnq even, a new family of degenerate quantum stabilizer codes is derived from the classical duadic codes. This answer an open problem asked by Aly et al.
[ { "version": "v1", "created": "Tue, 13 Nov 2007 19:06:43 GMT" } ]
2007-11-14T00:00:00
[ [ "Guenda", "Kenza", "" ] ]
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711.2051
S. M. Iftiquar
S. M. Iftiquar
Comment on`` Angular dependence of Dicke-narrowed electromagnetically induced transparency resonances''
1 page, no figure,
null
null
null
physics.optics physics.atom-ph
null
We demonstrate that the experimental results reported by M. Shuker, O. Firstenberg, R. Pugatch, A. Ben-Kish,1 A. Ron, and N. Davidson, Phys. Rev. A {\bf 76}, 023813 (2007) as Dicke narrowing of electromagnetically induced transparency, does not match with theory.
[ { "version": "v1", "created": "Tue, 13 Nov 2007 19:55:32 GMT" } ]
2007-11-14T00:00:00
[ [ "Iftiquar", "S. M.", "" ] ]
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711.2052
Alejandro Rodriguez
Alejandro W. Rodriguez, Alexander P. McCauley, Yehuda Avniel, and Steven G. Johnson
Computation and visualization of photonic quasicrystal spectra via Blochs theorem
Published in Physical Review B, 77 104201, 2008
Physical Review B, 77 104201, 2008
10.1103/PhysRevB.77.104201
null
physics.optics
null
Previous methods for determining photonic quasicrystal (PQC) spectra have relied on the use of large supercells to compute the eigenfrequencies and/or local density of states (LDOS). In this manuscript, we present a method by which the energy spectrum and the eigenstates of a PQC can be obtained by solving Maxwells equations in higher dimensions for any PQC defined by the standard cut-and-project construction, to which a generalization of Blochs theorem applies. In addition, we demonstrate how one can compute band structures with defect states in the higher-dimensional superspace with no additional computational cost. As a proof of concept, these general ideas are demonstrated for the simple case of one-dimensional quasicrystals, which can also be solved by simple transfer-matrix techniques.
[ { "version": "v1", "created": "Tue, 13 Nov 2007 19:17:27 GMT" }, { "version": "v2", "created": "Fri, 7 Mar 2008 21:55:52 GMT" } ]
2009-11-13T00:00:00
[ [ "Rodriguez", "Alejandro W.", "" ], [ "McCauley", "Alexander P.", "" ], [ "Avniel", "Yehuda", "" ], [ "Johnson", "Steven G.", "" ] ]
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711.2053
Federico Marulli
Federico Marulli, Silvia Bonoli, Enzo Branchini, Lauro Moscardini, Volker Springel
Modeling the cosmological co-evolution of supermassive black holes and galaxies: I. BH scaling relations and the AGN luminosity function
15 pages, 7 figures, MNRAS submitted
null
10.1111/j.1365-2966.2008.12988.x
null
astro-ph
null
We model the cosmological co-evolution of galaxies and their central supermassive black holes (BHs) within a semi-analytical framework developed on the outputs of the Millennium Simulation. This model, described in detail in Croton et al. (2006) and De Lucia & Blaizot (2007), introduces a `radio mode' feedback from Active Galactic Nuclei (AGN) at the centre of X-ray emitting atmospheres in galaxy groups and clusters. Thanks to this mechanism, the model can simultaneously explain: (i) the low observed mass drop-out rate in cooling flows; (ii) the exponential cut-off in the bright end of the galaxy luminosity function; and (iii) the bulge-dominated morphologies and old stellar ages of the most massive galaxies in clusters. This paper is the first of a series in which we investigate how well this model can also reproduce the physical properties of BHs and AGN. Here we analyze the scaling relations, the fundamental plane and the mass function of BHs, and compare them with the most recent observational data. Moreover, we extend the semi-analytic model to follow the evolution of the BH mass accretion and its conversion into radiation, and compare the derived AGN bolometric luminosity function with the observed one. While we find for the most part a very good agreement between predicted and observed BH properties, the semi-analytic model underestimates the number density of luminous AGN at high redshifts, independently of the adopted Eddington factor and accretion efficiency. However, an agreement with the observations is possible within the framework of our model, provided it is assumed that the cold gas fraction accreted by BHs at high redshifts is larger than at low redshifts.
[ { "version": "v1", "created": "Tue, 13 Nov 2007 19:20:21 GMT" } ]
2009-11-13T00:00:00
[ [ "Marulli", "Federico", "" ], [ "Bonoli", "Silvia", "" ], [ "Branchini", "Enzo", "" ], [ "Moscardini", "Lauro", "" ], [ "Springel", "Volker", "" ] ]
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711.2054
Horst Winkelnkemper E.
H. E. Winkelnkemper
AP Theory II:Intrinsic 4D Quantum YM Theory with Mass Gap
14 pages. See also http://www.math.umd.edu/~hew
null
null
null
math.GM
null
We describe a sub-theory of Artin Presentation Theory (AP Theory), which has many genuine,discrete,group-theoretic,non-infinitesimal, qualitative analogues (including with the mass gap) of the main desiderata of the hypothetical quantitative infinitesimal '4D Quantum YM Theory' for the so-called Clay Millenium 'YM Existence and Mass Gap' problem. Our entirely mathematically rigorous theory is not a model, no new axioms or measures are introduced,does not rely on SUSY,is free of smooth 4D singularities,moduli spaces,path integrals, graph/lattice combinatorics and probabilistic,category,twistor or topos arguments and is intimately related to the theory of pure framed braids. Despite being based on a rigorous, radical,universal Holographic Principle,the theory still contains an analogue of Donaldson/Seiberg-Witten Theory, an infinitely generated, at each stage, graded group of topology-changing transitions and interactions and more. Our main contention is: the radical,universal AP-holography, with its strong topology changing interactions, which reach all the way to the 'vacuum' of discrete group theory, may destroy any infinitesimal, PDE based Field Theory,required for solving the actual Clay YM problem in its present quantitative form as a problem of so-called 'constructive' 3+1 QFT. More generally,due to the fact that AP Theory is not a model,e.g., does not introduce any new axioms,any rigorous axiomatic 3+1 QFT has to align itself with it in a mathematically rigorous fashion.
[ { "version": "v1", "created": "Tue, 13 Nov 2007 19:31:54 GMT" }, { "version": "v2", "created": "Fri, 22 Feb 2008 16:19:36 GMT" } ]
2010-10-25T00:00:00
[ [ "Winkelnkemper", "H. E.", "" ] ]
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711.2055
Ronald Snell
J. Franklin, R. L. Snell, M. J. Kaufman, G. J. Melnick, D. A. Neufeld, D. J. Hollenbach, and E. A. Bergin
SWAS Observations of Water in Molecular Outflows
Accepted for publication in Ap.J., 51 pages including 4 pages of figures
null
10.1086/524924
null
astro-ph
null
We present SWAS detections of the ground-state 1(10)-1(01) transition of o-H2O at 557 GHz in 18 molecular outflows. These results are combined with ground-based observations of the J=1-0 transitions of 12CO and 13CO obtained at the FCRAO and, for a subset of the outflows, data from ISO. Assuming the SWAS water line emission originates from the same gas traced by CO emission, we find that the outflowing gas in most outflows has an o-H2O abundance relative to H2 of between 10(-7) and 10(-6). Analysis of the water abundance as a function of outflow velocity reveals a strong dependence. The water abundance increases with velocity, and at the highest outflow velocities some outflows have relative o-H2O abundances of order 10(-4). However the mass of gas with such elevated water abundances represents less that 1% of the total outflow gas mass. The ISO LWS observations of high-J rotational lines of CO and the 179.5 micron transition of o-H2O provide evidence for a warmer outflow component than required to produce either the SWAS or FCRAO lines. The mass associated with the ISO emission is similar to that responsible for the highest velocity water emission detected by SWAS. The bulk of the outflowing gas has an abundance of o-H2O well below what would be expected if the gas has passed through a C-shock with shock velocities greater than 10 km/s. Gas-phase water can be depleted in the post-shock gas due to freeze-out onto grain mantles, however the rate of freeze-out is too slow to explain our results. Therefore we believe that only a small fraction of the outflowing molecular gas has passed through shocks strong enough to fully convert the gas-phase oxygen to water. This result has implications for the acceleration mechanism of the molecular gas in these outflows.
[ { "version": "v1", "created": "Tue, 13 Nov 2007 19:49:18 GMT" } ]
2009-11-13T00:00:00
[ [ "Franklin", "J.", "" ], [ "Snell", "R. L.", "" ], [ "Kaufman", "M. J.", "" ], [ "Melnick", "G. J.", "" ], [ "Neufeld", "D. A.", "" ], [ "Hollenbach", "D. J.", "" ], [ "Bergin", "E. A.", "" ] ]
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711.2056
Sharon Toolan
Howard E. Bond (Space Telescope Science Institute)
Transient Mass-Loss Events in the PG 1159 Central Star of Longmore 4
4 pages, 2 figures; to appear in the proceedings of the Conference on Hydrogen-Deficient Stars, held in Tuebingen, Germany, Sept 17-21, 2007
null
null
STScI E-print #1786
astro-ph
null
A spectacular, transient mass-loss event in the hydrogen-deficient central star of the planetary nebula Longmore 4 was discovered in 1992 by Werner et al. During that event, the star temporarily changed from its normal PG 1159 spectrum to that of an emission-line [WCE] star. I have been monitoring the spectrum of Lo 4 since 2003. Out of 31 spectra, two of them reveal mass-loss outbursts similar to the one seen in 1992, showing that the phenomenon recurs. I speculate on possible mechanisms for these unique outbursts, but emphasize that we still have no fully convincing explanation.
[ { "version": "v1", "created": "Tue, 13 Nov 2007 19:53:16 GMT" } ]
2007-11-14T00:00:00
[ [ "Bond", "Howard E.", "", "Space Telescope Science Institute" ] ]
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711.2057
Volker Runde
Matthias Neufang, Volker Runde
Column and row operator spaces over QSL_p-spaces and their use in abstract harmonic analysis
21 pages; some nip 'n tuck
J. Math. Anal. Appl. 349 (2009), 21-29
null
null
math.FA
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The notions of column and row operator space were extended by A. Lambert from Hilbert spaces to general Banach spaces. In this paper, we use column and row spaces over quotients of subspaces of general $L_p$-spaces to equip several Banach algebras occurring naturally in abstract harmonic analysis with canonical, yet not obvious operator space structures that turn them into completely bounded Banach algebras. We use these operator space structures to gain new insights on those algebras.
[ { "version": "v1", "created": "Tue, 13 Nov 2007 19:55:12 GMT" }, { "version": "v2", "created": "Fri, 8 Aug 2008 18:03:07 GMT" }, { "version": "v3", "created": "Sun, 31 Aug 2008 02:00:20 GMT" } ]
2008-11-23T00:00:00
[ [ "Neufang", "Matthias", "" ], [ "Runde", "Volker", "" ] ]
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711.2058
Igor M. Suslov
I. M. Suslov (P.L.Kapitza Institute for Physical Problems, Moscow, Russia)
Computer Model of a "Sense of Humour". I. General Algorithm
10 pages, 3 figures included; continuation of this series to appear
Biofizika SSSR 37, 318 (1992) [Biophysics 37, 242 (1992)]
null
null
q-bio.NC cs.AI
null
A computer model of a "sense of humour" is proposed. The humorous effect is interpreted as a specific malfunction in the course of information processing due to the need for the rapid deletion of the false version transmitted into consciousness. The biological function of a sense of humour consists in speeding up the bringing of information into consciousness and in fuller use of the resources of the brain.
[ { "version": "v1", "created": "Tue, 13 Nov 2007 19:00:32 GMT" } ]
2007-11-27T00:00:00
[ [ "Suslov", "I. M.", "", "P.L.Kapitza Institute for Physical Problems, Moscow,\n Russia" ] ]
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711.2059
Moshe Moshe
Kirone Mallick, Moshe Moshe, Henri Orland
Supersymmetry and Nonequilibrium Work Relations
minor changes prior to submission for publication, references added
null
null
null
cond-mat.stat-mech
null
We give a field-theoretic proof of the nonequilibrium work relations for a space dependent field with stochastic dynamics. The path integral representation and its symmetries allow us to derive Jarzynski's equality. In addition, we derive a set of exact identities that generalize the fluctuation-dissipation relations to far-from equilibrium situations. These identities are prone to experimental verification. Furthermore, we show that supersymmetry invariance of the Langevin equation, which is broken when the external potential is time-dependent, is partially restored by adding to the action a term which is precisely Jarzynski's work. Jarzynski's equality can also be deduced from this supersymmetry
[ { "version": "v1", "created": "Tue, 13 Nov 2007 20:08:11 GMT" }, { "version": "v2", "created": "Fri, 1 Feb 2008 01:17:53 GMT" } ]
2008-02-01T00:00:00
[ [ "Mallick", "Kirone", "" ], [ "Moshe", "Moshe", "" ], [ "Orland", "Henri", "" ] ]
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711.206
Gang Cao
G. Cao, V. Durairaj, S. Chikara, L.E. DeLong, and P. Schlottmann
Ca3(Ru1-xCrx)2O7: A new paradigm for spin valves
5 figures. to be published in Physical Review Letters
null
10.1142/S0217984908016480
null
cond-mat.str-el
null
The spin valve effect is a quantum phenomenon so far only realized in multilayer thin films or heterostructures. Here we report a strong spin valve effect existing in bulk single crystals of Ca3(Ru1-xCrx)2O7 having an anisotropic, bilayered crystal structure. This discovery opens new avenues to understand the underlying physics of spin valves, and fully realize its potential in practical devices.
[ { "version": "v1", "created": "Tue, 13 Nov 2007 20:14:54 GMT" } ]
2009-11-13T00:00:00
[ [ "Cao", "G.", "" ], [ "Durairaj", "V.", "" ], [ "Chikara", "S.", "" ], [ "DeLong", "L. E.", "" ], [ "Schlottmann", "P.", "" ] ]
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711.2061
Igor M. Suslov
I. M. Suslov (P.L.Kapitza Institute for Physical Problems, Moscow, Russia)
Computer Model of a "Sense of Humour". II. Realization in Neural Networks
13 pages, 5 figures included; continuation of this series to appear
Biofizika SSSR 37, 325 (1992) [Biophysics 37, 249 (1992)]
null
null
q-bio.NC cs.AI
null
The computer realization of a "sense of humour" requires the creation of an algorithm for solving the "linguistic problem", i.e. the problem of recognizing a continuous sequence of polysemantic images. Such algorithm may be realized in the Hopfield model of a neural network after its proper modification.
[ { "version": "v1", "created": "Tue, 13 Nov 2007 20:15:10 GMT" } ]
2007-11-27T00:00:00
[ [ "Suslov", "I. M.", "", "P.L.Kapitza Institute for Physical Problems, Moscow,\n Russia" ] ]
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711.2062
Thomas Sandholm
Thomas Sandholm
Autoregressive Time Series Forecasting of Computational Demand
null
null
null
null
cs.DC
null
We study the predictive power of autoregressive moving average models when forecasting demand in two shared computational networks, PlanetLab and Tycoon. Demand in these networks is very volatile, and predictive techniques to plan usage in advance can improve the performance obtained drastically. Our key finding is that a random walk predictor performs best for one-step-ahead forecasts, whereas ARIMA(1,1,0) and adaptive exponential smoothing models perform better for two and three-step-ahead forecasts. A Monte Carlo bootstrap test is proposed to evaluate the continuous prediction performance of different models with arbitrary confidence and statistical significance levels. Although the prediction results differ between the Tycoon and PlanetLab networks, we observe very similar overall statistical properties, such as volatility dynamics.
[ { "version": "v1", "created": "Wed, 14 Nov 2007 00:57:13 GMT" } ]
2007-11-15T00:00:00
[ [ "Sandholm", "Thomas", "" ] ]
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711.2063
James Rossmanith
James A. Rossmanith
A class of residual distribution schemes and their relation to relaxation systems
46 pages, 14 figures
null
10.1016/j.jcp.2008.07.007
null
math.NA
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Residual distributions (RD) schemes are a class of of high-resolution finite volume methods for unstructured grids. A key feature of these schemes is that they make use of genuinely multidimensional (approximate) Riemann solvers as opposed to the piecemeal 1D Riemann solvers usually employed by finite volume methods. In 1D, LeVeque and Pelanti [J. Comp. Phys. 172, 572 (2001)] showed that many of the standard approximate Riemann solver methods (e.g., the Roe solver, HLL, Lax-Friedrichs) can be obtained from applying an exact Riemann solver to relaxation systems of the type introduced by Jin and Xin [Comm. Pure Appl. Math. 48, 235 (1995)]. In this work we extend LeVeque and Pelanti's results and obtain a multidimensional relaxation system from which multidimensional approximate Riemann solvers can be obtained. In particular, we show that with one choice of parameters the relaxation system yields the standard N-scheme. With another choice, the relaxation system yields a new Riemann solver, which can be viewed as a genuinely multidimensional extension of the local Lax-Friedrichs scheme. This new Riemann solver does not require the use Roe-Struijs-Deconinck averages, nor does it require the inversion of an m-by-m matrix in each computational grid cell, where $m$ is the number of conserved variables. Once this new scheme is established, we apply it on a few standard cases for the 2D compressible Euler equations of gas dynamics. We show that through the use of linear-preserving limiters, the new approach produces numerical solutions that are comparable in accuracy to the N-scheme, despite being computationally less expensive.
[ { "version": "v1", "created": "Tue, 13 Nov 2007 21:47:38 GMT" }, { "version": "v2", "created": "Mon, 14 Jul 2008 16:21:56 GMT" } ]
2009-11-13T00:00:00
[ [ "Rossmanith", "James A.", "" ] ]
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711.2064
James Bolton
J.S. Bolton (MPA), M. Viel (INAF/INFN, Trieste), T.-S. Kim (Potsdam), M.G. Haehnelt (IoA), R.F. Carswell (IoA)
Possible evidence for an inverted temperature-density relation in the intergalactic medium from the flux distribution of the Lyman-alpha forest
16 pages, 6 figures, accepted for publication in MNRAS following minor revision. The accepted version includes an expanded discussion of the flux power spectrum
Mon.Not.Roy.Astron.Soc. 386 (2008) 1131-1144
10.1111/j.1365-2966.2008.13114.x
null
astro-ph
null
We compare the improved measurement of the Lya forest flux probability distribution at 1.7<z<3.2 presented by Kim et al. (2007) to a large set of hydrodynamical simulations of the Lya forest with different cosmological parameters and thermal histories. The simulations are in good agreement with the observational data if the temperature-density relation for the low density intergalactic medium (IGM), T=T_0 Delta^{gamma-1}, is either close to isothermal or inverted (gamma<1). Our results suggest that the voids in the IGM may be significantly hotter and the thermal state of the low density IGM may be substantially more complex than is usually assumed at these redshifts. We discuss radiative transfer effects which alter the spectral shape of ionising radiation during the epoch of HeII reionisation as a possible physical mechanism for achieving an inverted temperature-density relation at z~3.
[ { "version": "v1", "created": "Wed, 14 Nov 2007 11:40:22 GMT" }, { "version": "v2", "created": "Tue, 19 Feb 2008 19:20:43 GMT" } ]
2009-11-13T00:00:00
[ [ "Bolton", "J. S.", "", "MPA" ], [ "Viel", "M.", "", "INAF/INFN, Trieste" ], [ "Kim", "T. -S.", "", "Potsdam" ], [ "Haehnelt", "M. G.", "", "IoA" ], [ "Carswell", "R. F.", "", "IoA" ] ]
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711.2065
Xiangyu Wang
Xiang-Yu Wang, Soebur Razzaque and Peter Meszaros
On the Origin and Survival of UHE Cosmic-Ray Nuclei in GRBs and Hypernovae
accepted by ApJ, references added, 12 pages, 4 figures, emulateapj style
Astrophys.J.677:432-440,2008
10.1086/529018
null
astro-ph hep-ph
null
The chemical composition of the ultra-high-energy (UHE) cosmic rays serves as an important clue for their origin. Recent measurements of the elongation rates by the Pierre Auger Observatory hint at the possible presence of heavy or intermediate mass nuclei in the UHE cosmic rays. Gamma-ray bursts (GRBs) and hypernovae have been suggested as possible sources of the UHE cosmic rays. Here we derive the constraints on the physical conditions under which UHE heavy nuclei, if they are accelerated in these sources, can survive in their intense photon fields. We find that in the GRB external shock and in the hypernova scenarios, UHE nuclei can easily survive photo-disintegration. In the GRB internal shock scenario, UHE nuclei can also survive, provided the dissipation radius and/or the bulk Lorentz factor of the relativistic outflow are relatively large, or if the low-energy self-absorption break in the photon spectrum of the prompt emission occurs above several KeV. In internal shocks and in the other scenarios, intermediate-mass UHE nuclei have a higher probability of survival against photo-disintegration than UHE heavy nuclei such as Fe.
[ { "version": "v1", "created": "Wed, 14 Nov 2007 19:38:38 GMT" }, { "version": "v2", "created": "Sat, 22 Dec 2007 14:20:27 GMT" }, { "version": "v3", "created": "Tue, 8 Jan 2008 01:38:53 GMT" } ]
2010-11-11T00:00:00
[ [ "Wang", "Xiang-Yu", "" ], [ "Razzaque", "Soebur", "" ], [ "Meszaros", "Peter", "" ] ]
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711.2066
Chris Fassnacht
C. D. Fassnacht (1), D. D. Kocevski (1), M. W. Auger (1), L. M. Lubin (1), J. L. Neureuther (1), T. E. Jeltema (2), J. S. Mulchaey (3), J. P. McKean (4) ((1) UC Davis, (2) UCO/Lick Observatories, (3) OCIW, (4) MPIfR, Bonn)
The X-ray Properties of Moderate-redshift Galaxy Groups Selected by Association with Gravitational Lenses
Accepted for publication in ApJ (July 10, 2008 issue). New smoothing technique reveals that one system (B2108) has a multiple-peak brightness distribution. Changed discussion and figures accordingly. Corrected some values in Table 2
null
10.1086/588087
null
astro-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We present results from a systematic investigation of the X-ray properties of a sample of moderate redshift (0.3<z<0.6) galaxy groups. These groups were selected not by traditional X-ray or optical search methods, but rather by an association, either physical or along the line of sight, with a strong gravitational lens. We calculate the properties of seven galaxy groups in the fields of six lens systems. Diffuse X-ray emission from the intragroup medium is detected in four of the groups. All of the detected groups have X-ray luminosities greater than 10^{42} h^{-2} erg/s, and lie on the L_X-sigma_v relations defined by local groups and clusters. The upper limits for the non-detections are also consistent with the local L_X-sigma_v relationships. Although the sample size is small and deeper optical and X-ray data are needed, these results suggest that lens-selected groups are similar to X-ray selected samples and, thus, are more massive than the typical poor-group environments of local galaxies.
[ { "version": "v1", "created": "Tue, 13 Nov 2007 21:00:25 GMT" }, { "version": "v2", "created": "Fri, 13 Jun 2008 21:34:13 GMT" } ]
2009-11-13T00:00:00
[ [ "Fassnacht", "C. D.", "" ], [ "Kocevski", "D. D.", "" ], [ "Auger", "M. W.", "" ], [ "Lubin", "L. M.", "" ], [ "Neureuther", "J. L.", "" ], [ "Jeltema", "T. E.", "" ], [ "Mulchaey", "J. S.", "" ], [ "McKean", "J. P.", "" ] ]
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711.2067
Gianluigi Catelani
G. Catelani, M. G. Vavilov
Effect of Coulomb interaction on current noise in open quantum dots
4.5 pages, 2 figures
Phys. Rev. B 76, 201303(R) (2007)
10.1103/PhysRevB.76.201303
null
cond-mat.mes-hall
null
We analyze the effect of Coulomb interaction on the noise of electric current through an open quantum dot. We demonstrate that the ensemble average value of the noise power acquires an interaction correction even for a dot coupled to the leads by reflectionless point contacts, when the ensemble average conductance is known to have no interaction corrections. To leading order, the correction to the noise originates from the formation of a nonequilibrium state of the Coulomb field describing the interaction between electrons. We find the dependence of the current noise power on the electron temperature, the applied voltage bias, and the strength of the Coulomb interaction.
[ { "version": "v1", "created": "Tue, 13 Nov 2007 21:12:55 GMT" } ]
2007-11-15T00:00:00
[ [ "Catelani", "G.", "" ], [ "Vavilov", "M. G.", "" ] ]
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711.2068
Michael Wood-Vasey
W. Michael Wood-Vasey, Andrew S. Friedman, Joshua S. Bloom, Malcolm Hicken, Maryam Modjaz, Robert P. Kirshner, Dan L. Starr, Cullen H. Blake, Emilio E. Falco, Andrew H. Szentgyorgyi, Peter Challis, Stephane Blondin, Kaisey S. Mandel, Armin Rest
Type Ia Supernovae are Good Standard Candles in the Near Infrared: Evidence from PAIRITEL
37 pages. 8 Figures. 3 Tables. Revised to ApJ-accepted version
Astrophys.J.689:377-390,2008
10.1086/592374
null
astro-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We have obtained 1087 NIR (JHKs) measurements of 21 SNe Ia using PAIRITEL, nearly doubling the number of well-sampled NIR SN Ia light curves. These data strengthen the evidence that SNe Ia are excellent standard candles in the NIR, even without correction for optical light-curve shape. We construct fiducial NIR templates for normal SNe Ia from our sample, excluding only the three known peculiar SNe Ia: SN 2005bl, SN 2005hk, and SN 2005ke. The H-band absolute magnitudes in this sample of 18 SNe Ia have an intrinsic rms of only 0.15 mag with no correction for light-curve shape. We found a relationship between the H-band extinction and optical color excess of AH=0.2E(B-V). This variation is as small as the scatter in distance modulus measurements currently used for cosmology based on optical light curves after corrections for light-curve shape. Combining the homogeneous PAIRITEL measurements with 23 SNe Ia from the literature, these 41 SNe Ia have standard H-band magnitudes with an rms scatter of 0.16 mag. The good match of our sample with the literature sample suggests there are few systematic problems with the photometry. We present a nearby NIR Hubble diagram that shows no correlation of the residuals from the Hubble line with light-curve properties. Future samples that account for optical and NIR light-curve shapes, absorption, spectroscopic variation, or host-galaxy properties may reveal effective ways to improve the use of SNe Ia as distance indicators. Since systematic errors due to dust absorption in optical bands remain the leading difficulty in the cosmological use of supernovae, the good behavior of SN Ia NIR light curves and their relative insensitivity to reddening make these objects attractive candidates for future cosmological work.
[ { "version": "v1", "created": "Tue, 13 Nov 2007 21:01:06 GMT" }, { "version": "v2", "created": "Thu, 5 Feb 2009 16:54:01 GMT" } ]
2009-02-24T00:00:00
[ [ "Wood-Vasey", "W. Michael", "" ], [ "Friedman", "Andrew S.", "" ], [ "Bloom", "Joshua S.", "" ], [ "Hicken", "Malcolm", "" ], [ "Modjaz", "Maryam", "" ], [ "Kirshner", "Robert P.", "" ], [ "Starr", "Dan L.", "" ], [ "Blake", "Cullen H.", "" ], [ "Falco", "Emilio E.", "" ], [ "Szentgyorgyi", "Andrew H.", "" ], [ "Challis", "Peter", "" ], [ "Blondin", "Stephane", "" ], [ "Mandel", "Kaisey S.", "" ], [ "Rest", "Armin", "" ] ]
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711.2069
Deepak Parashar
Florin F. Nichita, Deepak Parashar
New constructions of Yang-Baxter systems
8 pages, LaTeX
AMS Contemporary Math. 442 (2007) 193-200
null
null
math.QA math.RA
null
The quantum Yang-Baxter equation admits generalisations to systems of Yang-Baxter type equations called Yang-Baxter systems. Starting from algebra structures, we propose new constructions of some constant as well as the spectral-parameter dependent Yang-Baxter systems. Besides, we also present explicitly the commutation algebra structure associated to the constant type in dimension two.
[ { "version": "v1", "created": "Tue, 13 Nov 2007 21:02:03 GMT" } ]
2007-11-15T00:00:00
[ [ "Nichita", "Florin F.", "" ], [ "Parashar", "Deepak", "" ] ]
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711.207
Gil Refael
Ehud Altman, Yariv Kafri, Anatoli Polkovnikov, Gil Refael
The insulating phases and superfluid-insulator transition of disordered boson chains
4.2 pages, 1 figure, submitted to PRL
null
10.1103/PhysRevLett.100.170402
null
cond-mat.dis-nn cond-mat.supr-con
null
Using a strong disorder real-space renormalization group (RG), we study the phase diagram of a fully disordered chain of interacting bosons. Since this approach does not suffer from run-away flows, it allows a direct study of the insulating phases, which are not accessible in a weak disorder perturbative treatment. We find that the universal properties of the insulating phase are determined by the details and symmetries of the onsite chemical-potential disorder. Three insulating phases are possible: (i) an incompressible Mott glass with a finite superfluid susceptibility, (ii) a random-singlet glass with diverging compressibility and superfluid susceptibility, (iii) a Bose glass with a finite compressibility but diverging superfluid susceptibility. In addition to characterizing the insulating phases, we show that the superfluid-insulator transition is always of the Kosterlitz-Thouless universality class.
[ { "version": "v1", "created": "Tue, 13 Nov 2007 21:03:50 GMT" } ]
2009-11-13T00:00:00
[ [ "Altman", "Ehud", "" ], [ "Kafri", "Yariv", "" ], [ "Polkovnikov", "Anatoli", "" ], [ "Refael", "Gil", "" ] ]
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711.2071
Dennis Zaritsky
Dennis Zaritsky, Ann I. Zabludoff, and Anthony H. Gonzalez
Toward Equations of Galactic Structure
submitted to ApJ
null
10.1086/529577
null
astro-ph
null
We find that all classes of galaxies, ranging from disks to spheroids and from dwarf spheroidals to brightest cluster galaxies, lie on a two dimensional surface within the space defined by the logarithms of the half-light radius, r_e, mean surface brightness within r_e, I_e, and internal velocity, V^2 = (1/2)v_c^2 + sigma^2, where v_c is the rotational velocity and sigma is the velocity dispersion. If these quantities are expressed in terms of kpc, L_solar/pc^2, and km/s, then log r_e - log V^2 + log I_e + log Upsilon_e + 0.8 = 0, where we provide a fitting function for Upsilon_e, the mass-to-light ratio within r_e in units of M_solar/L_solar, that depends only on V and I_e. The scatter about this surface for our heterogeneous sample of 1925 galaxies is small (< 0.1 dex) and could be as low as ~ 0.05 dex, or 10%. This small scatter has three possible implications for how gross galactic structure is affected by internal factors, such as stellar orbital structure, and by external factors, such as environment. These factors either 1) play no role beyond generating some of the observed scatter, 2) move galaxies along the surface, or 3) balance each other to maintain this surface as the locus of galactic structure equilibria. We cast the behavior of Upsilon_e in terms of the fraction of baryons converted to stars, eta, and the concentration of those stars within the dark matter halo, xi = R_{200}/r_e. We derive eta = 1.9 x 10^{-5} (L/L^*) Upsilon_* V^{-3} and xi = 1.4 V/r_e. Finally, we present and discuss the distributions of eta and xi for the full range of galaxies. For systems with internal velocities comparable to that of the Milky Way (149 < V < 163 km/s), eta = 0.14 +- 0.05, and xi is, on average, ~ 5 times greater for spheroids than for disks. (Abridged)
[ { "version": "v1", "created": "Tue, 13 Nov 2007 21:04:06 GMT" } ]
2009-11-13T00:00:00
[ [ "Zaritsky", "Dennis", "" ], [ "Zabludoff", "Ann I.", "" ], [ "Gonzalez", "Anthony H.", "" ] ]
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711.2072
Oriol Pujolas
Claudia de Rham, Gia Dvali, Stefan Hofmann, Justin Khoury, Oriol Pujolas, Michele Redi and Andrew J. Tolley
Cascading DGP
4 pages; one reference added and a typo corrected
Phys.Rev.Lett.100:251603,2008
10.1103/PhysRevLett.100.251603
null
hep-th astro-ph hep-ph
null
We present a higher codimension generalization of the DGP scenario which, unlike previous attempts, is free of ghost instabilities. The 4D propagator is made regular by embedding our visible 3-brane within a 4-brane, each with their own induced gravity terms, in a flat 6D bulk. The model is ghost-free if the tension on the 3-brane is larger than a certain critical value, while the induced metric remains flat. The gravitational force law `cascades' from a 6D behavior at the largest distances followed by a 5D and finally a 4D regime at the shortest scales.
[ { "version": "v1", "created": "Tue, 13 Nov 2007 21:06:54 GMT" }, { "version": "v2", "created": "Fri, 14 Dec 2007 22:46:30 GMT" } ]
2008-11-26T00:00:00
[ [ "de Rham", "Claudia", "" ], [ "Dvali", "Gia", "" ], [ "Hofmann", "Stefan", "" ], [ "Khoury", "Justin", "" ], [ "Pujolas", "Oriol", "" ], [ "Redi", "Michele", "" ], [ "Tolley", "Andrew J.", "" ] ]
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711.2073
Elena Gallo
Elena Gallo, Tommaso Treu, Jeremy Jacob, Jong-Hak Woo, Phil Marshall, Robert Antonucci (UCSB)
AMUSE-Virgo I. Super-massive black holes in low-mass spheroids
Revised version, accepted by ApJ
null
10.1086/588012
null
astro-ph
null
We present the first results from the AGN Multiwavelength Survey of Early-type galaxies in the Virgo cluster (AMUSE-Virgo). This large program targets 100 early-type galaxies with the Advanced CCD Imaging Spectrometer on board the Chandra X-ray Observatory and the Multi-band Imaging Photometer on board the Spitzer Space Telescope, with the aim of providing an unbiased census of low-level super-massive black hole (SMBH) activity in the local universe. Here we report on the Chandra observations of the first 16 targets, and combine them with results from archival data of another, typically more massive, 16 targets. Point-like X-ray emission from a position coincident with the optical nucleus is detected in 50% of the galaxies (down to our completeness limit of ~4E+38 erg/sec). Two of the X-ray nuclei are hosted by galaxies (VCC1178=N4464 and VCC1297=N4486B) with absolute B magnitudes fainter than -18, where nuclear star clusters are known to become increasingly common. After carefully accounting for possible contamination from low mass X-ray binaries, we argue that the detected nuclear X-ray sources are most likely powered by low-level accretion on to a SMBH, with a <11% chance contamination in VCC1178, where a star cluster is barely resolvable in archival Hubble Space Telescope images. Based on black hole mass estimates from the global properties of the host galaxies, all the detected nuclei are highly sub-Eddington, with luminosities in the range -8.4<log(L_0.3-10keV/L_Edd)<-5.9. The incidence of nuclear X-ray activity increases with the stellar mass M_star of the host galaxy: only between 3-44% of the galaxies with M_star<1E+10 M_Sun harbor an X-ray active SMBH. The fraction rises to between 49-87% in galaxies with stellar mass above 1E+10 M_Sun (at the 95% confidence level).
[ { "version": "v1", "created": "Tue, 13 Nov 2007 21:08:15 GMT" }, { "version": "v2", "created": "Tue, 4 Mar 2008 00:58:20 GMT" } ]
2009-11-13T00:00:00
[ [ "Gallo", "Elena", "", "UCSB" ], [ "Treu", "Tommaso", "", "UCSB" ], [ "Jacob", "Jeremy", "", "UCSB" ], [ "Woo", "Jong-Hak", "", "UCSB" ], [ "Marshall", "Phil", "", "UCSB" ], [ "Antonucci", "Robert", "", "UCSB" ] ]
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711.2074
Silvia Viola Kusminskiy
S. Viola Kusminskiy, K. S. D. Beach, A. H. Castro Neto, David K. Campbell
Mean Field study of the heavy fermion metamagnetic transition
9+ pages, 5 figures. Final version
Phys. Rev. B 77, 094419 (2008)
10.1103/PhysRevB.77.094419
null
cond-mat.str-el
null
We investigate the evolution of the heavy fermion ground state under application of a strong external magnetic field. We present a richer version of the usual hybridization mean field theory that allows for hybridization in both the singlet and triplet channels and incorporates a self-consistent Weiss field. We show that for a magnetic field strength B*, a filling-dependent fraction of the zero-field hybridization gap, the spin up quasiparticle band becomes fully polarized--an event marked by a sudden jump in the magnetic susceptibility. The system exhibits a kind of quantum rigidity in which the susceptibility (and several other physical observables) are insensitive to further increases in field strength. This behavior ends abruptly with the collapse of the hybridization order parameter in a first-order transition to the normal metallic state. We argue that the feature at B* corresponds to the "metamagnetic transition" in YbRh2Si2. Our results are in good agreement with recent experimental measurements.
[ { "version": "v1", "created": "Tue, 13 Nov 2007 21:10:45 GMT" }, { "version": "v2", "created": "Mon, 31 Mar 2008 23:53:58 GMT" } ]
2008-04-01T00:00:00
[ [ "Kusminskiy", "S. Viola", "" ], [ "Beach", "K. S. D.", "" ], [ "Neto", "A. H. Castro", "" ], [ "Campbell", "David K.", "" ] ]
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711.2075
Alain Destexhe
R. Brette, Z. Piwkowska, M. Rudolph-Lilith, T. Bal, A. Destexhe
High-resolution intracellular recordings using a real-time computational model of the electrode
null
null
null
null
q-bio.NC
null
Intracellular recordings of neuronal membrane potential are a central tool in neurophysiology. In many situations, especially in vivo, the traditional limitation of such recordings is the high electrode resistance, which may cause significant measurement errors. We introduce a computer-aided technique, Active Electrode Compensation (AEC), based on a digital model of the electrode interfaced in real time with the electrophysiological setup. The characteristics of this model are first estimated using white noise current injection. The electrode and membrane contribution are digitally separated, and the recording is then made by online subtraction of the electrode contribution. Tests comparing AEC to other techniques demonstrate that it yields recordings with improved accuracy. It enables high-frequency recordings in demanding conditions, such as injection of conductance noise in dynamic-clamp mode, not feasible with a single high resistance electrode until now. AEC should be particularly useful to characterize fast phenomena in neurons, in vivo and in vitro.
[ { "version": "v1", "created": "Tue, 13 Nov 2007 21:51:26 GMT" } ]
2007-11-15T00:00:00
[ [ "Brette", "R.", "" ], [ "Piwkowska", "Z.", "" ], [ "Rudolph-Lilith", "M.", "" ], [ "Bal", "T.", "" ], [ "Destexhe", "A.", "" ] ]
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711.2076
Shravan Hanasoge
S. M. Hanasoge, A. C. Birch, T. J. Bogdan, L. Gizon
{\it f}-mode interactions with thin flux tubes: the scattering matrix
Accepted, ApJ; 15 pages, 4 figures
null
10.1086/587455
null
astro-ph
null
We calculate the scattering effects associated with the interaction of a surface gravity or {\it f} mode with a thin magnetic flux tube embedded in a realistically stratified medium. We find that the dominant scattered wave is an $f$ mode with amplitude and phase of 1.17% and around $49^\circ$ relative to the incident wave, compared to the values of 0.13% and $40^\circ$ estimated from observations. The extent of scattering into high-order acoustic $p$ modes is too weak to be accurately characterized. We recover the result that the degree of scattering is enhanced as (a) the frequency of the incident wave increases and (b) the flux tube becomes magnetically dominated.
[ { "version": "v1", "created": "Tue, 13 Nov 2007 21:14:56 GMT" }, { "version": "v2", "created": "Thu, 21 Feb 2008 00:01:48 GMT" }, { "version": "v3", "created": "Wed, 27 Feb 2008 18:49:50 GMT" } ]
2009-11-13T00:00:00
[ [ "Hanasoge", "S. M.", "" ], [ "Birch", "A. C.", "" ], [ "Bogdan", "T. J.", "" ], [ "Gizon", "L.", "" ] ]
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711.2077
Jean Pradines
Jean Pradines
Lie Groupoids as generalized atlases
34 pages, lecture delivered at the 5th Conference on Geometry ans Topology of Manifolds, Krynica (Poland), April 2003
CEJM 2(5) 2004 624-662
null
null
math.DG math.CT
null
Starting with some motivating examples (classical atlases for a manifold, space of leaves of a foliation, group orbits), we propose to view a Lie groupoid as a generalized atlas for the "virtual structure" of its orbit space, the equivalence between atlases being here the smooth Morita equivalence. This "structure" keeps memory of the isotropy groups and of the smoothness as well. To take the smoothness into account, we claim that we can go very far by retaining just a few formal properties of embeddings and surmersions, yielding a very polymorphous unifying theory. We suggest further developments.
[ { "version": "v1", "created": "Tue, 13 Nov 2007 21:15:48 GMT" } ]
2007-11-15T00:00:00
[ [ "Pradines", "Jean", "" ] ]
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711.2078
Pasquale Tricarico
Pasquale Tricarico
Figure-Figure Interaction Between Bodies Having Arbitrary Shapes and Mass Distributions: A Power Series Expansion Approach
13 pages, accepted by Celestial Mechanics and Dynamical Astronomy
null
10.1007/s10569-008-9128-7
null
astro-ph
null
We derive an expression for the mutual gravitational force and torque of two bodies having arbitrary shapes and mass distributions, as an expansion in power series of their products of inertia and of the relative coordinates of their centres of mass. The absolute convergence of all the power series developed is rigorously demonstrated. The absence of transcendental functions makes this formalism suitable for fast numerical applications. The products of inertia used here are directly related to the spherical harmonics coefficients, and we provide a detailed analysis of this relationship.
[ { "version": "v1", "created": "Tue, 13 Nov 2007 21:19:13 GMT" }, { "version": "v2", "created": "Thu, 31 Jan 2008 06:50:04 GMT" }, { "version": "v3", "created": "Thu, 28 Feb 2008 01:50:58 GMT" } ]
2009-11-13T00:00:00
[ [ "Tricarico", "Pasquale", "" ] ]
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711.2079
Iain W. Stewart
Sean Fleming, Andre H. Hoang, Sonny Mantry, Iain W. Stewart
Top Jets in the Peak Region: Factorization Analysis with NLL Resummation
92 pages, 22 figs, typos corrected, journal version
Phys.Rev.D77:114003,2008
10.1103/PhysRevD.77.114003
MIT-CTP 3868, CALT-68-2625, MPP-2007-103
hep-ph nucl-th
null
We consider top-quarks produced at large energy in e+e- collisions, and address the question of what top-mass can be measured from reconstruction. The production process is characterized by well separated scales: the center-of-mass energy, Q, the top mass, m, the top decay width, Gamma_t, and also LambdaQCD; scales which can be disentangled with effective theory methods. In particular we show how the mass measurement depends on the way in which soft radiation is treated, and that this can shift the mass peak by an amount of order Q LambdaQCD/m. We sum large logs for Q >> m >> Gamma_t > LambdaQCD and demonstrate that the renormalization group ties together the jet and soft interactions below the scale m. Necessary conditions for the invariant mass spectrum to be protected from large logs are formulated. Results for the cross-section are presented at next-to-leading order with next-to-leading-log resummation, for invariant masses in the peak region and the tail region. Using our results we also predict the thrust distribution for massive quark jets at NLL order for large thrust. We demonstrate that soft radiation can be precisely controlled using data on massless jet production, and that in principle, a short distance mass parameter can be measured using jets with precision better than LambdaQCD.
[ { "version": "v1", "created": "Wed, 14 Nov 2007 20:52:46 GMT" }, { "version": "v2", "created": "Sat, 31 May 2008 18:27:31 GMT" } ]
2008-11-26T00:00:00
[ [ "Fleming", "Sean", "" ], [ "Hoang", "Andre H.", "" ], [ "Mantry", "Sonny", "" ], [ "Stewart", "Iain W.", "" ] ]
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711.208
Eric S. Swanson
T. Barnes and E.S. Swanson
Hadron Loops: General Theorems and Application to Charmonium
10 pages, 1 ps figure. Typos corrected; discussion of psi-eta_c mass splitting added, published version
Phys.Rev.C77:055206,2008
10.1103/PhysRevC.77.055206
null
hep-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper we develop a formalism for incorporating hadron loops in the quark model. We derive expressions for mass shifts, continuum components and mixing amplitudes of "quenched" quark model states due to hadron loops, as perturbation series in the valence-continuum coupling Hamiltonian. We prove three general theorems regarding the effects of hadron loops, which show that given certain constraints on the external "bare" quark model states, the valence-continuum coupling, and the hadrons summed in the loops, the following results hold: (1) The loop mass shifts are identical for all states within a given N,L multiplet. (2) These states have the same total open-flavor decay widths. (3) Loop-induced valence configuration mixing vanishes provided that ${\L}_i \neq \L_f$ or $\S_i \neq \S_f$. The charmonium system is used as a numerical case study, with the $^3\P_0$ decay model providing the valence-continuum coupling. We evaluate the mass shifts and continuum mixing numerically for all 1S, 1P and 2S charmonium valence states due to loops of D, D$^*$, D$_s$ and D$_s^*$ meson pairs. We find that the mass shifts are quite large, but are numerically similar for all the low-lying charmonium states, as suggested by the first theorem. Thus, loop mass shifts may have been "hidden" in the valence quark model by a change of parameters. The two-meson continuum components of the physical charmonium states are also found to be large, creating challenges for the interpretation of the constituent quark model.
[ { "version": "v1", "created": "Tue, 13 Nov 2007 21:26:40 GMT" }, { "version": "v2", "created": "Fri, 7 Dec 2007 05:50:14 GMT" }, { "version": "v3", "created": "Thu, 5 Mar 2009 18:29:11 GMT" } ]
2009-03-05T00:00:00
[ [ "Barnes", "T.", "" ], [ "Swanson", "E. S.", "" ] ]
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711.2081
Pawe{\l} Klimas
Pawel Klimas
Perturbations of the signum-Gordon model
22 pages, 8 figures
J. Phys. A: Math. Theor. 41 (2008) 095403
10.1088/1751-8113/41/9/095403
null
hep-th
null
We investigate a perturbation of a scalar field model (called here the signum-Gordon model) with the potential $V(f)=|f|$. The perturbation generalizes the signum-Gordon model to the signum-Klein-Gordon model i.e. to the case $V(f)=|f|-{1/2}\lambda f^2$, where $\lambda$ is a small parameter. Such a generalization breaks the scaling symmetry of the signum-Gordon model. In this paper we concentrate on solutions for self-similar initial data. Such data are particulary useful for identification of the effects caused by the term that breaks the scaling symmetry. We have found that the behaviour of the solutions is quite interesting - they escape and return periodically to the self-similar initial data.
[ { "version": "v1", "created": "Tue, 13 Nov 2007 21:31:06 GMT" }, { "version": "v2", "created": "Fri, 8 Feb 2008 09:47:20 GMT" } ]
2008-02-19T00:00:00
[ [ "Klimas", "Pawel", "" ] ]
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711.2082
Christian Heiliger
Christian Heiliger, Michael Czerner, Bogdan Yu. Yavorsky, Ingrid Mertig, Mark D. Stiles
Implementation of a non-equilibrium Green's function method to calculate spin transfer torque
4 pages, 4 figures
J. Appl. Phys. 103, 07A709 (2008)
10.1063/1.2835071
null
cond-mat.mes-hall
null
We present an implementation of the steady state Keldysh approach in a Green's function multiple scattering scheme to calculate the non-equilibrium spin density. This density is used to obtain the spin transfer torque in junctions showing the magnetoresistance effect. We use our implementation to study the spin transfer torque in metallic Co/Cu/Co junctions.
[ { "version": "v1", "created": "Tue, 13 Nov 2007 21:31:48 GMT" }, { "version": "v2", "created": "Wed, 13 Feb 2008 20:51:15 GMT" } ]
2008-02-13T00:00:00
[ [ "Heiliger", "Christian", "" ], [ "Czerner", "Michael", "" ], [ "Yavorsky", "Bogdan Yu.", "" ], [ "Mertig", "Ingrid", "" ], [ "Stiles", "Mark D.", "" ] ]
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711.2083
Alexander Braverman
Alexander Braverman and Michael Finkelberg
Pursuing the double affine Grassmannian I: transversal slices via instantons on A_k-singularities
Section 7 has been rewritten to correct previous mistakes
Duke Math. J. 152, no. 2 (2010), 175-206
10.1215/00127094-2010-011
null
math.AG hep-th math.RT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This paper is the first in a series that describe a conjectural analog of the geometric Satake isomorphism for an affine Kac-Moody group. In this paper we construct a model for the singularities of some would-be Schubert varieties in the affine Grassmannian for an affine Kac-Moody group. We formulate a conjecture describing the (local) intersection cohomology of these varieties in terms of integrable representations of the Langlands dual affine Kac-Moody group and check this conjecture in a number of cases. Roughly speaking the above singularities are constructed by looking at the Uhlenbeck space of instantons on the quotient of the affine plane by a finite cyclic subgroup of SL(2).
[ { "version": "v1", "created": "Tue, 13 Nov 2007 21:42:39 GMT" }, { "version": "v2", "created": "Sun, 25 Nov 2007 19:00:27 GMT" }, { "version": "v3", "created": "Mon, 5 May 2008 16:02:01 GMT" }, { "version": "v4", "created": "Tue, 3 Mar 2009 19:54:41 GMT" }, { "version": "v5", "created": "Fri, 13 Nov 2009 20:00:30 GMT" } ]
2019-12-19T00:00:00
[ [ "Braverman", "Alexander", "" ], [ "Finkelberg", "Michael", "" ] ]
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711.2084
Lee Lindblom
Lee Lindblom, Keith D. Matthews, Oliver Rinne, and Mark A. Scheel
Gauge Drivers for the Generalized Harmonic Einstein Equations
17 pages, 9 figures
Phys.Rev.D77:084001,2008
10.1103/PhysRevD.77.084001
null
gr-qc
null
The generalized harmonic representation of Einstein's equation is manifestly hyperbolic for a large class of gauge conditions. Unfortunately most of the useful gauges developed over the past several decades by the numerical relativity community are incompatible with the hyperbolicity of the equations in this form. This paper presents a new method of imposing gauge conditions that preserves hyperbolicity for a much wider class of conditions, including as special cases many of the standard ones used in numerical relativity: e.g., K-freezing, Gamma-freezing, Bona-Masso slicing, conformal Gamma-drivers, etc. Analytical and numerical results are presented which test the stability and the effectiveness of this new gauge driver evolution system.
[ { "version": "v1", "created": "Tue, 13 Nov 2007 23:33:36 GMT" } ]
2008-11-26T00:00:00
[ [ "Lindblom", "Lee", "" ], [ "Matthews", "Keith D.", "" ], [ "Rinne", "Oliver", "" ], [ "Scheel", "Mark A.", "" ] ]
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711.2085
Markus Sch\"oller
S. Hubrig, R.V. Yudin, M. Pogodin, M. Schoeller, G.J. Peters
Evidence for weak magnetic fields in early-type emission stars
4 pages, 3 figures, 1 table, accepted for publication in AN
null
10.1002/asna.200710877
null
astro-ph
null
We report the results of our study of magnetic fields in a sample of 15 Be stars using spectropolarimetric data obtained at the European Southern Observatory with the multi-mode instrument FORS1 installed at the 8m Kueyen telescope. We detect weak photospheric magnetic fields in four stars, HD56014, HD148184, HD155806, and HD181615. We note that for HD181615 the evolutionary status is not obvious due to the fact that it is a binary system currently observed in the initial rapid phase of mass exchange between the two components. Further, we notify the possible presence of distinct circular polarisation features in the circumstellar components of Ca II H&K in three stars, HD58011, HD117357, and HD181615, hinting at a probable presence of magnetic fields in the circumstellar mass loss disks of these stars. We emphasize the need for future spectropolarimetric observations of Be stars with detected magnetic fields to study the temporal evolution of their magnetic fields and the correlation of magnetic field properties with dynamical phenomena taking place in the gaseous circumstellar disks of these stars.
[ { "version": "v1", "created": "Tue, 13 Nov 2007 22:17:26 GMT" } ]
2009-11-13T00:00:00
[ [ "Hubrig", "S.", "" ], [ "Yudin", "R. V.", "" ], [ "Pogodin", "M.", "" ], [ "Schoeller", "M.", "" ], [ "Peters", "G. J.", "" ] ]
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711.2086
Gaurav Khanna
Subir Sabharwal and Gaurav Khanna
Numerical solutions to lattice-refined models in loop quantum cosmology
null
Class.Quant.Grav.25:085009,2008
10.1088/0264-9381/25/8/085009
null
gr-qc
null
In this article, we develop an intuitive and efficient, numerical technique to solve the quantum evolution equation of generic lattice-refined models in loop quantum cosmology. As an application of this method, we extensively study the solutions of the recently introduced, lattice-refined anisotropic model of the Schwarzschild interior geometry. Our calculations suggest that the results obtained from the approach are accurate, robust and are in complete agreement with the expectations from the von Neumann stability analysis of the model.
[ { "version": "v1", "created": "Tue, 13 Nov 2007 22:15:10 GMT" } ]
2008-11-26T00:00:00
[ [ "Sabharwal", "Subir", "" ], [ "Khanna", "Gaurav", "" ] ]
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711.2087
Edna Ruckhaus
Edna Ruckhaus, Eduardo Ruiz, Maria-Esther Vidal
Query Evaluation and Optimization in the Semantic Web
18 pages, 8 figures, 7 tables. Presented at the ALPSWS2006 First International Workshop on Applications of Logic Programming in the Semantic Web and Semantic Web Services where it got a "Best Paper Award". To appear in Theory and Practice of Logic Programming (TPLP)
null
null
null
cs.DB cs.LO
null
We address the problem of answering Web ontology queries efficiently. An ontology is formalized as a Deductive Ontology Base (DOB), a deductive database that comprises the ontology's inference axioms and facts. A cost-based query optimization technique for DOB is presented. A hybrid cost model is proposed to estimate the cost and cardinality of basic and inferred facts. Cardinality and cost of inferred facts are estimated using an adaptive sampling technique, while techniques of traditional relational cost models are used for estimating the cost of basic facts and conjunctive ontology queries. Finally, we implement a dynamic-programming optimization algorithm to identify query evaluation plans that minimize the number of intermediate inferred facts. We modeled a subset of the Web ontology language OWL Lite as a DOB, and performed an experimental study to analyze the predictive capacity of our cost model and the benefits of the query optimization technique. Our study has been conducted over synthetic and real-world OWL ontologies, and shows that the techniques are accurate and improve query performance. To appear in Theory and Practice of Logic Programming (TPLP).
[ { "version": "v1", "created": "Tue, 13 Nov 2007 22:31:09 GMT" } ]
2007-11-15T00:00:00
[ [ "Ruckhaus", "Edna", "" ], [ "Ruiz", "Eduardo", "" ], [ "Vidal", "Maria-Esther", "" ] ]
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711.2088
Sumanta Das
Sumanta Das and G.S. Agarwal
Photon-Photon Correlations as a Probe of Vacuum Induced Coherence Effects
7 pages, 6 figures, submitted to Physical Review A
PHYSICAL REVIEW A 77, 033850 (2008)
10.1103/PhysRevA.77.033850
null
quant-ph
null
We present new experimental implications of the effects of vacuum induced coherence on the photon -photon correlation in the pi-polarized fluorescence in j = 1/2 to j = 1/2 transition. These effects should be thus observable in measurements of photon statistics in for example Hg and Ba ion traps.
[ { "version": "v1", "created": "Tue, 13 Nov 2007 22:39:24 GMT" } ]
2009-11-23T00:00:00
[ [ "Das", "Sumanta", "" ], [ "Agarwal", "G. S.", "" ] ]
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711.2089
Justin Finke
J. D. Finke, J. C. Shields, M. Boettcher, S. Basu
Redshift Limits of BL Lacertae Objects from Optical Spectroscopy
4 pages, 2 figures. Accepted by A&A Research Notes
null
10.1051/0004-6361:20078492
null
astro-ph
null
Context: BL Lacertae objects have been the targets for numerous recent multiwavelength campaigns, continuum spectral variability studies, and theoretical spectral and variability modeling. A meaningful interpretation of the results of such studies requires a reliable knowledge of the objects' redshifts; however, the redshifts for many are still unknown or uncertain. Aims: Therefore, we hope to determine or constrain the redshifts of six BL Lac objects with unknown or poorly known redshifts. Methods: Observations were made of these objects with the MDM 2.4 m Hiltner telescope. Although no spectral features were detected, and thus no redshifts could be measured, lower redshift limits were assigned to the objects based on the expected equivalent widths of absorption features in their host galaxies. Redshifts were also estimated for some objects by assuming the host galaxies are standard candles and using host galaxy apparent magnitudes taken from the literature. Results: The commonly used redshift of $z=0.102$ for 1219+285 is almost certainly wrong, while the redshifts of the other objects studied remain undetermined.
[ { "version": "v1", "created": "Tue, 13 Nov 2007 22:41:44 GMT" } ]
2009-11-13T00:00:00
[ [ "Finke", "J. D.", "" ], [ "Shields", "J. C.", "" ], [ "Boettcher", "M.", "" ], [ "Basu", "S.", "" ] ]
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711.209
Mohsen Shadmehri
Mohsen Shadmehri
Dynamics of charged dust particles in protoplanetary discs
Accepted for publication in Astrophysics & Space Science
Astrophys.SpaceSci.314:217-223,2008
10.1007/s10509-008-9762-2
null
astro-ph
null
We study the effect of an imposed magnetic field on the motion of charged dust particles in magnetically active regions of a protoplanetary disc. Assuming a power law structure for the vertical and the toroidal components of the magnetic field for the regions beyond magnetically dead region of the disc, the radial and the vertical velocities of the charged particles, in the asymptotic case of small particles, are calculated analytically. While grains with radii smaller than a critical radius significantly are affected by the magnetic force, motion of the particles with larger radii is independent of the magnetic field. The critical radius depends on the magnetic geometry and the charge of the grains. Assuming that a grain particle has one elementary charge and the physical properties of the disc correspond to a minimum-mass solar nebula, we show that only micron-sized grains are affected by the magnetic force. Also, charge polarity determines direction of the radial velocity. For such small particles, both the radial and the vertical velocities increase due to the magnetic force.
[ { "version": "v1", "created": "Tue, 13 Nov 2007 23:03:11 GMT" }, { "version": "v2", "created": "Wed, 13 Feb 2008 11:43:41 GMT" } ]
2008-11-26T00:00:00
[ [ "Shadmehri", "Mohsen", "" ] ]
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711.2091
Falk Herwig
Paul Woodward (1), Falk Herwig (2), David Porter (1), Tyler Fuchs (1), Anthony Nowatzki (1) and Marco Pignatari (2) ((1) Laboratory for Computational Science and Engineering, University of Minnesota, USA, (2) Astrophysics Group, School of Physical and Geographical Sciences, Keele University, UK)
Nuclear burning and mixing in the first stars: entrainment at a convective boundary using the PPB advection scheme
Proceedings paper of First Stars III, 2006, Santa Fe, contributions by Falk Herwig and Paul Woodward, to appear in AIP Conf. Ser., ed. T. Abel, A. Heger and B. O'Shea
AIP Conf.Proc.990:300-308,2008
10.1063/1.2905567
LAUR 07-7598
astro-ph
null
The evolution of the first generations of stars at zero or extremly low metallicity, and especially some crucial properties like the primary N14 production, is charactarized by convective-reactive mixing events that are mostly absent from similar evolution phases at solar-like metallicity. These episodes occur when unprocessed H-rich material is mixed accross a convective boundary into C12 rich He-burning material, as for example in He-shell flashes of extremely-low metallicity AGB stars. In this paper we describe the astrophysical context of such convective-reactive events, including the difficulty of current one-dimensional stellar evolution models to correctly simulate these evolutionary phases. We then describe the requirements and current state of modeling convective-reactive processes in the first stars environment. We demonstrate some of the new concepts that we are applying to this problem, i.e. the highly accurate PPB advection scheme in the framework of PPM hydrodynamic simulations of mixing accross a very stiff convective boundary. We show initial results of such simulations that address the first non-reactive step of this problem, which is the entrainment of H at the top boundary of the He-shell flash convection zone.
[ { "version": "v1", "created": "Tue, 13 Nov 2007 23:20:49 GMT" } ]
2009-06-23T00:00:00
[ [ "Woodward", "Paul", "" ], [ "Herwig", "Falk", "" ], [ "Porter", "David", "" ], [ "Fuchs", "Tyler", "" ], [ "Nowatzki", "Anthony", "" ], [ "Pignatari", "Marco", "" ] ]
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711.2092
Binhai Zhu
Binhai Zhu
On the 1-density of Unit Ball Covering
11 pages, 4 figures
null
null
null
math.GM
null
Motivated by modern applications like image processing and wireless sensor networks, we consider a variation of the famous Kepler Conjecture. Given any infinite set of unit balls covering the whole space, we want to know the optimal (lim sup) density of the volume which is covered by exactly one ball (i.e., the maximum such density over all unit ball covers, called the {\em optimal 1-density} and denoted as $\delta_d$, where $d$ is the dimension of the Euclidean space). We prove that in 2D the optimal 1-density $\delta_2=(3\sqrt(3)-\pi)/\pi \approx 0.6539$, which is achieved through a regular hexagonal covering. In 3D, the problem is widely open and we present a Dodecehadral Cover Conjecture which states that the optimal 1-density in 3D, $\delta_3$, is bounded from above by the 1-density of a unit ball whose Voronoi polyhedron is a regular dodecahedron of circum-radius one (determined by 12 extra unit balls). We show numerically that this 1-density $\delta_3(dc)\approx 0.315$.
[ { "version": "v1", "created": "Tue, 13 Nov 2007 23:08:28 GMT" }, { "version": "v2", "created": "Sat, 24 Nov 2007 22:44:08 GMT" }, { "version": "v3", "created": "Fri, 30 Nov 2007 18:19:46 GMT" }, { "version": "v4", "created": "Thu, 20 Dec 2007 18:01:54 GMT" } ]
2007-12-20T00:00:00
[ [ "Zhu", "Binhai", "" ] ]
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711.2093
Romain Tessera
Xiaoman Chen, Romain Tessera, Xianjin Wang, Guoliang Yu
Metric sparsification and operator norm localization
null
null
null
null
math.MG math.KT
null
We study an operator norm localization property and its applications to the coarse Novikov conjecture in operator K-theory. A metric space X is said to have operator norm localization property if there exists a positive number c such that for every r>0, there is R>0 for which, if m is a positive locally finite Borel measure on X, H is a separable infinite dimensional Hilbert space and T is a bounded linear operator acting on L^2(X,m) with propagation r, then there exists an unit vector v satisfying with support of diameter at most R and such that |Tv| is larger or equal than c|T|. If X has finite asymptotic dimension, then X has operator norm localization property. In this paper, we introduce a sufficient geometric condition for the operator norm localization property. This is used to give many examples of finitely generated groups with infinite asymptotic dimension and the operator norm localization property. We also show that any sequence of expanding graphs does not possess the operator norm localization property.
[ { "version": "v1", "created": "Tue, 13 Nov 2007 23:20:05 GMT" } ]
2007-11-15T00:00:00
[ [ "Chen", "Xiaoman", "" ], [ "Tessera", "Romain", "" ], [ "Wang", "Xianjin", "" ], [ "Yu", "Guoliang", "" ] ]
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711.2094
Shaul Mukamel
Christoph A. Marx, Upendra Harbola and Shaul Mukamel
Nonlinear optical spectroscopy of single, few, and many molecules; nonequilibrium Green's function QED approach
article: 33 pages (preprint format!) ''paper.tex'' figures: 17 figures (.eps) in folder ``figures''
null
10.1103/PhysRevA.77.022110
null
quant-ph
null
Nonlinear optical signals from an assembly of N noninteracting particles consist of an incoherent and a coherent component, whose magnitudes scale \sim N and \sim N(N-1), respectively. A unified microscopic description of both types of signals is developed using a quantum electrodynamical (QED) treatment of the optical fields. Closed nonequilibrium Green's function expressions are derived that incorporate both stimulated and spontaneous processes. General (n+1)-wave mixing experiments are discussed as an example of spontaneously generated signals. When performed on a single particle, such signals cannot be expressed in terms of the nth order polarization, as predicted by the semiclassical theory. Stimulated processes are shown to be purely incoherent in nature. Within the QED framework, heterodyne-detected wave mixing signals are simply viewed as incoherent stimulated emission, whereas homodyne signals are generated by coherent spontaneous emission.
[ { "version": "v1", "created": "Tue, 13 Nov 2007 23:29:57 GMT" } ]
2009-11-13T00:00:00
[ [ "Marx", "Christoph A.", "" ], [ "Harbola", "Upendra", "" ], [ "Mukamel", "Shaul", "" ] ]
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711.2095
M\'arton Hidas
M. G. Hidas (1 and 2), A. A. Christou (3), T. M. Brown (1 and 2) ((1) Las Cumbres Observatory Global Telescope, (2) University of California, Santa Barbara, (3) Armagh Observatory)
An observation of a mutual event between two satellites of Uranus
4 pages, 3 figures, accepted for publication in MNRAS Letters
null
10.1111/j.1745-3933.2007.00418.x
null
astro-ph
null
We present observations of the occultation of Umbriel by Oberon on 4 May, 2007. We believe this is the first observed mutual event between satellites of Uranus. Fitting a simple geometric model to the lightcurve, we measure the mid-event time with a precision of 4 seconds. We assume previously measured values for the albedos of the two satellites (Karkoschka 2001), and measure the impact parameter to be 500 +/- 80 km. These measurements are more precise than estimates based on current ephemerides for these satellites. Therefore observations of additional mutual events during the 2007-2008 Uranian equinox will provide improved estimates of their orbital and physical parameters.
[ { "version": "v1", "created": "Tue, 13 Nov 2007 23:43:04 GMT" } ]
2009-11-13T00:00:00
[ [ "Hidas", "M. G.", "", "1 and 2" ], [ "Christou", "A. A.", "", "1 and 2" ], [ "Brown", "T. M.", "", "1 and 2" ] ]
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711.2096
Eduardo Candelario-Jalil
Eduardo Candelario-Jalil, Saeid Taheri, Yi Yang, Rohit Sood, Mark Grossetete, Eduardo Y. Estrada, Bernd L. Fiebich, Gary A. Rosenberg
Cyclooxygenase Inhibition Limits Blood-Brain Barrier Disruption following Intracerebral Injection of Tumor Necrosis Factor-alpha in the Rat
null
Journal of Pharmacology and Experimental Therapeutics 323(2): 488-498 (2007)
null
null
q-bio.TO q-bio.BM
null
Increased permeability of the blood-brain barrier (BBB) is important in neurological disorders. Neuroinflammation is associated with increased BBB breakdown and brain injury. Tumor necrosis factor-a (TNF-a) is involved in BBB injury and edema formation through a mechanism involving matrix metalloproteinase (MMP) upregulation. There is emerging evidence indicating that cyclooxygenase (COX) inhibition limits BBB disruption following ischemic stroke and bacterial meningitis, but the mechanisms involved are not known. We used intracerebral injection of TNF-a to study the effect of COX inhibition on TNF-a-induced BBB breakdown, MMP expression/activity and oxidative stress. BBB disruption was evaluated by the uptake of 14C-sucrose into the brain and by magnetic resonance imaging (MRI) utilizing Gd-DTPA as a paramagnetic contrast agent. Using selective inhibitors of each COX isoform, we found that COX-1 activity is more important than COX-2 in BBB opening. TNF-a induced a significant upregulation of gelatinase B (MMP-9), stromelysin-1 (MMP-3) and COX-2. In addition, TNF-a significantly depleted glutathione as compared to saline. Indomethacin (10 mg/kg; i.p.), an inhibitor of COX-1 and COX-2, reduced BBB damage at 24 h. Indomethacin significantly attenuated MMP-9 and MMP-3 expression and activation, and prevented the loss of endogenous radical scavenging capacity following intracerebral injection of TNF-a. Our results show for the first time that BBB disruption during neuroinflammation can be significantly reduced by administration of COX inhibitors. Modulation of COX in brain injury by COX inhibitors or agents modulating prostaglandin E2 formation/signaling may be useful in clinical settings associated with BBB disruption.
[ { "version": "v1", "created": "Tue, 13 Nov 2007 23:54:39 GMT" } ]
2007-11-15T00:00:00
[ [ "Candelario-Jalil", "Eduardo", "" ], [ "Taheri", "Saeid", "" ], [ "Yang", "Yi", "" ], [ "Sood", "Rohit", "" ], [ "Grossetete", "Mark", "" ], [ "Estrada", "Eduardo Y.", "" ], [ "Fiebich", "Bernd L.", "" ], [ "Rosenberg", "Gary A.", "" ] ]
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711.2097
Igor Ivanov
I. P. Ivanov
Production of spin-3 mesons in diffractive DIS
4 pages, talk given at the 12th Workshop on High Energy Spin Physics (DSPIN-07), Dubna, Russia, September 3-7, 2007
null
null
null
hep-ph
null
Non-trivial spin effects do not die out with energy growth. Here, we discuss one example of such effects -- production of spin-3 mesons in diffractive DIS. Using both explicit k_t-factorization calculations and their vector-dominance-model interpretation, we argue that diffractive production of rho_3(1690) is a unique probe of several novel aspects of diffraction.
[ { "version": "v1", "created": "Wed, 14 Nov 2007 00:01:38 GMT" } ]
2007-11-15T00:00:00
[ [ "Ivanov", "I. P.", "" ] ]
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711.2098
Alexander Isaev
A. V. Isaev and N. G. Kruzhilin
Proper actions of Lie groups of dimension $n^2+1$ on $n$-dimensional complex manifolds
60 pages
null
10.1016/j.jmaa.2007.12.050
null
math.CV math.DG
null
In this paper we continue to study actions of high-dimensional Lie groups on complex manifolds. We give a complete explicit description of all pairs $(M,G)$, where $M$ is a connected complex manifold $M$ of dimension $n\ge 2$, and $G$ is a connected Lie group of dimension $n^2+1$ acting effectively and properly on $M$ by holomorphic transformations. This result complements a classification obtained earlier by the first author for $n^2+2\le\hbox{dim} G<n^2+2n$ and a classical result due to W. Kaup for the maximal group dimension $n^2+2n$.
[ { "version": "v1", "created": "Wed, 14 Nov 2007 00:14:06 GMT" } ]
2015-05-13T00:00:00
[ [ "Isaev", "A. V.", "" ], [ "Kruzhilin", "N. G.", "" ] ]
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711.2099
Hiroshi Suzuki
Issaku Kanamori, Fumihiko Sugino and Hiroshi Suzuki
Euclidean lattice simulation for the dynamical supersymmetry breaking
5 pages, 4 figures, the final version to appear in Phys. Rev. D
Phys.Rev.D77:091502,2008
10.1103/PhysRevD.77.091502
RIKEN-TH-121, OIQP-07-15
hep-lat hep-th
null
The global supersymmetry is spontaneously broken if and only if the ground-state energy is strictly positive. We propose to use this fact to observe the spontaneous supersymmetry breaking in euclidean lattice simulations. For lattice formulations that possess a manifest fermionic symmetry, there exists a natural choice of a hamiltonian operator that is consistent with a topological property of the Witten index. We confirm validity of our idea in models of the supersymmetric quantum mechanics. We then examine a possibility of a dynamical supersymmetry breaking in the two-dimensional $\mathcal{N}=(2,2)$ super Yang-Mills theory with the gauge group $\SU(2)$, for which the Witten index is unknown. Differently from a recent conjectural claim, our numerical result tempts us to conclude that supersymmetry is not spontaneously broken in this system.
[ { "version": "v1", "created": "Wed, 14 Nov 2007 00:40:12 GMT" }, { "version": "v2", "created": "Tue, 4 Dec 2007 00:53:00 GMT" }, { "version": "v3", "created": "Fri, 23 May 2008 00:38:39 GMT" } ]
2008-11-26T00:00:00
[ [ "Kanamori", "Issaku", "" ], [ "Sugino", "Fumihiko", "" ], [ "Suzuki", "Hiroshi", "" ] ]
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711.21
Igor Chilingarian
Igor Chilingarian, Olga Sil'chenko, Victor Afanasiev, Philippe Prugniel
Low-Luminosity Early-Type Galaxies in the NGC 128 Group
2 pages, 1 figure, submitted to the proceedings of ``Pathways through an eclectic Universe''. The original PDF-version of the poster is attached as well
null
null
null
astro-ph
null
We present spatially resolved kinematics and stellar population parameters for three low-luminosity galaxies in the NGC128 group obtained by means of 3D spectroscopy. We briefly discuss their evolutionary scenarii.
[ { "version": "v1", "created": "Wed, 14 Nov 2007 00:45:58 GMT" } ]
2007-11-15T00:00:00
[ [ "Chilingarian", "Igor", "" ], [ "Sil'chenko", "Olga", "" ], [ "Afanasiev", "Victor", "" ], [ "Prugniel", "Philippe", "" ] ]
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711.2101
Nario Kuno
Nario Kuno, Kouichiro Nakanishi, Kazuo Sorai and Toshihito Shibatsuka
Central Spiral Structure of Molecular Gas in Maffei 2
7 pages, 10 figures, Publication of Astronomical Society of Japan, in press
null
10.1093/pasj/60.3.475
null
astro-ph
null
Distribution and kinematics of molecular gas in the central region of the barred spiral galaxy Maffei 2 were investigated using a data set of 12CO(1-0), 12CO(2-1), CS(2-1) lines and 103 GHz continuum. We found that the offset ridges along the kpc-scale bar continue to the central spiral structure embedded in the weak oval structure which is regarded as x2 orbit in the bar potential. The spiral structure continues toward the center diverging from the oval structure. The size of these structures is less than R ~ 100 pc. The mass concentration within R = 35 pc is estimated to be 2 X 10^8 Mo. The high mass concentration is consistent with theoretical predictions concerning the creation of such a nuclear spiral structure. A comparison with the tracers of dense gas and star-forming region suggests that the dense molecular gas traced by CS(2-1) line is formed at the crossing points of x1 and x2 orbits and the star-forming region appears after 2 X 10^5 yr which is comparable with the free-fall time of the dense gas traced by the CS line (~ 10^5 cm^-3).
[ { "version": "v1", "created": "Wed, 14 Nov 2007 01:36:27 GMT" } ]
2015-05-13T00:00:00
[ [ "Kuno", "Nario", "" ], [ "Nakanishi", "Kouichiro", "" ], [ "Sorai", "Kazuo", "" ], [ "Shibatsuka", "Toshihito", "" ] ]
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711.2102
Gil Shamir
Gil I. Shamir
Patterns of i.i.d. Sequences and Their Entropy - Part II: Bounds for Some Distributions
null
null
null
null
cs.IT math.IT
null
A pattern of a sequence is a sequence of integer indices with each index describing the order of first occurrence of the respective symbol in the original sequence. In a recent paper, tight general bounds on the block entropy of patterns of sequences generated by independent and identically distributed (i.i.d.) sources were derived. In this paper, precise approximations are provided for the pattern block entropies for patterns of sequences generated by i.i.d. uniform and monotonic distributions, including distributions over the integers, and the geometric distribution. Numerical bounds on the pattern block entropies of these distributions are provided even for very short blocks. Tight bounds are obtained even for distributions that have infinite i.i.d. entropy rates. The approximations are obtained using general bounds and their derivation techniques. Conditional index entropy is also studied for distributions over smaller alphabets.
[ { "version": "v1", "created": "Wed, 14 Nov 2007 02:13:15 GMT" } ]
2007-11-15T00:00:00
[ [ "Shamir", "Gil I.", "" ] ]
[ 0.0525755733, -0.0762975141, 0.0987123325, 0.0059214085, 0.0670992136, 0.0361154489, 0.1424284875, -0.0243997127, -0.043909803, 0.0501549654, 0.0599826276, 0.0040877992, -0.0567874275, 0.0190622751, 0.0570294894, 0.0206840821, 0.0520430394, -0.0039788717, -0.0953234807, 0.0710205957, -0.0253195446, 0.0193406455, -0.0234314706, 0.0448780432, 0.0411745161, -0.0497192554, 0.0578524955, 0.0632262379, 0.1515299678, -0.0309837628, 0.0626452938, 0.0209987611, 0.0833656862, -0.1080558747, 0.073199138, 0.129260391, -0.0508811474, 0.0284663327, 0.041416578, 0.0699555278, 0.0036490643, -0.0265540536, -0.0446117781, 0.0328234248, 0.0236372221, -0.0651143119, 0.0935322344, -0.1274207234, -0.0546088815, 0.0632262379, -0.0812355503, 0.113381207, -0.0090530682, -0.0774594098, 0.0578040816, 0.0148625234, -0.0844791681, 0.0525755733, 0.0010196805, -0.148528412, 0.0997289866, -0.0274012648, 0.0488720462, 0.0087323375, -0.0807030201, 0.065501608, -0.144752264, 0.0303544048, 0.117351003, 0.0618222877, -0.0047141309, 0.0245449487, 0.0754745081, 0.022523744, 0.035026174, 0.0236372221, -0.0343726128, -0.0470323823, -0.0009659732, 0.0667603239, 0.0911600366, 0.0727634281, 0.0701975897, 0.0294345748, -0.0982766226, 0.1206430271, 0.0095977047, 0.0276191197, -0.0411261022, 0.0023464754, -0.0732959658, -0.0151772024, -0.1050543189, -0.0472986512, 0.0224511251, -0.0858347043, 0.0789601803, 0.0731507242, -0.0114252623, -0.019352749, -0.0638071895, 0.019183306, 0.0025688687, -0.0602246895, 0.0687936395, 0.016956348, -0.1193843111, -0.0220638271, -0.0969694927, -0.0627905354, 0.0170894824, 0.0207809061, 0.0020590285, -0.0029319597, 0.1051511467, -0.0028109292, 0.0137369419, 0.0779919401, 0.0018774829, 0.0772173479, -0.0527692214, -0.1181255952, 0.0260215197, 0.0630325899, -0.0564969555, -0.0698102936, 0.0143299904, -0.0719888359, -0.0231167916, -0.040690396, 0.0918862224, 0.0674865097, 0.0066566677, -0.0117036318, 0.0252711307, -0.0562064834, 0.0502033792, -0.0068503162, -0.0040908251, 0.018941246, -0.0027428498, 0.0602246895, -0.0377372541, 0.1425253153, 0.0471292064, 0.0571263134, -0.1018591225, -0.0343968198, 0.0607088096, 0.0236856341, -0.0479522124, -0.070923768, 0.0704396516, 0.0641460717, 0.0316131189, -0.082833156, -0.0749903917, -0.0068261102, 0.0344694369, 0.0279337987, 0.0162059609, 0.117544651, -0.0427963212, 0.0500097312, 0.0139184874, 0.0202604756, -0.0805577859, -0.038584467, -0.0881584883, -0.038293995, 0.0961949006, -0.0677285716, -0.0232257191, -0.1432999074, 0.0663730279, -0.0010537202, -0.1244191751, -0.0004863906, -0.1093145907, -0.0322908908, 0.0273286477, 0.1247096434, 0.0027231823, -0.0265540536, 0.082203798, 0.0137490444, 0.0839950442, 0.0273770597, 0.0480490401, -0.0432562381, -0.0507359132, 0.1402983516, 0.0899981484, 0.0481216572, -0.0362606831, -0.1244191751, 0.0284663327, 0.0934838206, -0.0158307664, -0.018578155, 0.0149714509, 0.0227415971, -0.0441276543, 0.0700523481, -0.0660825595, 0.0037943006, -0.0354376771, -0.0305722598, -0.0794443041, -0.0121030323, 0.0050832736, -0.0536890514, -0.019183306, -0.039843183, -0.009131738, 0.0579009056, -0.0590143874, 0.0600310415, -0.0142210629, 0.1516267955, -0.006042439, -0.0127686989, -0.070488058, 0.068212688, 0.0519462153, -0.0143541964, 0.069229342, -0.041198723, 0.0250774827, -0.0102754747, 0.0769268721, 0.0362364799, -0.0264572296, -0.0953718945, -0.0323635079, 0.0522366874, -0.0345904678, 0.0185418464, -0.1111542508, 0.0060696709, 0.0195342936, 0.1105733067, -0.0247628037, 0.0646301955, 0.0613865815, -0.0280064177, -0.0524303354, 0.0350745879, -0.0786212981, -0.0315647088, -0.0650659055, -0.080315724, 0.0056158071, 0.0075522922, -0.0116128596, -0.0628873557 ]
711.2103
Simon Johnston
Simon Johnston (ATNF, CSIRO), et al
Science With The Australian Square Kilometre Array Pathfinder
Accepted for publication in PASA. 14 pages, 6 figures
PoSMRU:006,2007
10.1071/AS07033
null
astro-ph
null
The future of cm and m-wave astronomy lies with the Square Kilometre Array (SKA), a telescope under development by a consortium of 17 countries that will be 50 times more sensitive than any existing radio facility. Most of the key science for the SKA will be addressed through large-area imaging of the Universe at frequencies from a few hundred MHz to a few GHz. The Australian SKA Pathfinder (ASKAP) is a technology demonstrator aimed in the mid-frequency range, and achieves instantaneous wide-area imaging through the development and deployment of phased-array feed systems on parabolic reflectors. The large field-of-view makes ASKAP an unprecedented synoptic telescope that will make substantial advances in SKA key science. ASKAP will be located at the Murchison Radio Observatory in inland Western Australia, one of the most radio-quiet locations on the Earth and one of two sites selected by the international community as a potential location for the SKA. In this paper, we outline an ambitious science program for ASKAP, examining key science such as understanding the evolution, formation and population of galaxies including our own, understanding the magnetic Universe, revealing the transient radio sky and searching for gravitational waves.
[ { "version": "v1", "created": "Wed, 14 Nov 2007 02:50:33 GMT" } ]
2009-11-13T00:00:00
[ [ "Johnston", "Simon", "", "ATNF, CSIRO" ] ]
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711.2104
Arthur Cunha
Arthur Cunha, Minh Do, and Martin Vetterli
On the Information Rates of the Plenoptic Function
submitted to IEEE Transactions in Information Theory
null
null
null
cs.IT cs.CV math.IT math.PR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The {\it plenoptic function} (Adelson and Bergen, 91) describes the visual information available to an observer at any point in space and time. Samples of the plenoptic function (POF) are seen in video and in general visual content, and represent large amounts of information. In this paper we propose a stochastic model to study the compression limits of the plenoptic function. In the proposed framework, we isolate the two fundamental sources of information in the POF: the one representing the camera motion and the other representing the information complexity of the "reality" being acquired and transmitted. The sources of information are combined, generating a stochastic process that we study in detail. We first propose a model for ensembles of realities that do not change over time. The proposed model is simple in that it enables us to derive precise coding bounds in the information-theoretic sense that are sharp in a number of cases of practical interest. For this simple case of static realities and camera motion, our results indicate that coding practice is in accordance with optimal coding from an information-theoretic standpoint. The model is further extended to account for visual realities that change over time. We derive bounds on the lossless and lossy information rates for this dynamic reality model, stating conditions under which the bounds are tight. Examples with synthetic sources suggest that in the presence of scene dynamics, simple hybrid coding using motion/displacement estimation with DPCM performs considerably suboptimally relative to the true rate-distortion bound.
[ { "version": "v1", "created": "Wed, 14 Nov 2007 02:54:22 GMT" }, { "version": "v2", "created": "Mon, 19 Nov 2007 02:53:30 GMT" }, { "version": "v3", "created": "Fri, 7 Aug 2009 18:11:32 GMT" } ]
2009-08-08T00:00:00
[ [ "Cunha", "Arthur", "" ], [ "Do", "Minh", "" ], [ "Vetterli", "Martin", "" ] ]
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711.2105
Kyle Dawson
Kyle Dawson, Chris Bebek, John Emes, Steve Holland, Sharon Jelinsky, Armin Karcher, William Kolbe, Nick Palaio, Natalie Roe, Juhi Saha, Koki Takasaki, and Guobin Wang
Radiation Tolerance of Fully-Depleted P-Channel CCDs Designed for the SNAP Satellite
11 pages, 10 figures, submitted to IEEE Transactions
IEEE Trans.Nucl.Sci.55:1725-1735,2008
10.1109/TNS.2008.919262
null
astro-ph
null
Thick, fully depleted p-channel charge-coupled devices (CCDs) have been developed at the Lawrence Berkeley National Laboratory (LBNL). These CCDs have several advantages over conventional thin, n-channel CCDs, including enhanced quantum efficiency and reduced fringing at near-infrared wavelengths and improved radiation tolerance. Here we report results from the irradiation of CCDs with 12.5 and 55 MeV protons at the LBNL 88-Inch Cyclotron and with 0.1-1 MeV electrons at the LBNL Co60 source. These studies indicate that the LBNL CCDs perform well after irradiation, even in the parameters in which significant degradation is observed in other CCDs: charge transfer efficiency, dark current, and isolated hot pixels. Modeling the radiation exposure over a six-year mission lifetime with no annealing, we expect an increase in dark current of 20 e/pixel/hr, and a degradation of charge transfer efficiency in the parallel direction of 3e-6 and 1e-6 in the serial direction. The dark current is observed to improve with an annealing cycle, while the parallel CTE is relatively unaffected and the serial CTE is somewhat degraded. As expected, the radiation tolerance of the p-channel LBNL CCDs is significantly improved over the conventional n-channel CCDs that are currently employed in space-based telescopes such as the Hubble Space Telescope.
[ { "version": "v1", "created": "Wed, 14 Nov 2007 04:06:30 GMT" } ]
2014-11-18T00:00:00
[ [ "Dawson", "Kyle", "" ], [ "Bebek", "Chris", "" ], [ "Emes", "John", "" ], [ "Holland", "Steve", "" ], [ "Jelinsky", "Sharon", "" ], [ "Karcher", "Armin", "" ], [ "Kolbe", "William", "" ], [ "Palaio", "Nick", "" ], [ "Roe", "Natalie", "" ], [ "Saha", "Juhi", "" ], [ "Takasaki", "Koki", "" ], [ "Wang", "Guobin", "" ] ]
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711.2106
Jonathan Langton
Jonathan Langton and Gregory Laughlin
Hydrodynamic Simulations of Unevenly Irradiated Jovian Planets
24 pages, 5 figures, 3 tables
null
10.1086/523957
null
astro-ph
null
We employ a two-dimensional grid-based hydrodynamic model to simulate upper atmospheric dynamics on extrasolar giant planets. Our model is well-suited to simulate the dynamics of the atmospheres of planets with high orbital eccentricity that are subject to widely-varying irradiation conditions. We identify six such planets, with eccentricities between $e=0.28$ and $e=0.93$ and semimajor axes ranging from $a=0.0508$ A.U. to $a=0.432$ A.U., as particularly interesting objects for study. For each of these planets, we determine the temperature profile and resulting infrared light curves in the 8-$\mu$m Spitzer bands. Especially notable are the results for HD 80606b, which has the largest eccentricity ($e=0.9321$) of any known planet, and HAT-P-2b, which transits its parent star, so that its physical properties are well-constrained. Despite the variety of orbital parameters, the atmospheric dynamics of these eccentric planets display a number of interesting common properties. In all cases, the atmospheric response is primarily driven by the intense irradiation at periastron. The resulting expansion of heated air produces high-velocity turbulent flow, including long-lived circumpolar vortices. Additionally, a superrotating acoustic front develops on some planets; the strength of this disturbance depends on both the eccentricity and the temperature gradient resulting from uneven heating. The specifics of the resulting infrared light curves depend strongly on the orbital geometry. We show, however, that the variations on HD 80606 b and HAT-P-2b should be readily detectable at 4.5 and 8 $\mu$m using the Spitzer Space Telescope. Indeed, these two objects present the most attractive observational targets of all known high-$e$ exoplanets.
[ { "version": "v1", "created": "Wed, 14 Nov 2007 04:31:18 GMT" } ]
2009-11-13T00:00:00
[ [ "Langton", "Jonathan", "" ], [ "Laughlin", "Gregory", "" ] ]
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711.2107
David London
Alakabha Datta, Yanyan Gao, Andrei V. Gritsan, David London, Makiko Nagashima, Alejandro Szynkman
Study of Polarization in B -> VT Decays
15 pages, latex, 3 figures (enclosed), several changes made, conclusions unchanged, publication info added
Phys.Rev.D77:114025,2008
10.1103/PhysRevD.77.114025
UMISS-HEP-2007-04, UdeM-GPP-TH-07-162
hep-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper, we examine B -> VT decays (V is a vector and T is a tensor meson), whose final-state particles can have transverse or longitudinal polarization. Measurements have been made of B -> \phi K_2^*, and it is found that fT/fL is small, where fT (fL) is the fraction of transverse (longitudinal) decays. We find that the standard model (SM) naively predicts that fT/fL << 1. The two extensions of the naive SM which have been proposed to explain the large fT/fL in B -> \phi K^* -- penguin annihilation and rescattering -- make no firm predictions for the polarization in B -> \phi K_2^*. The two new-physics scenarios, which explain the data in B -> \pi K and the \phi (\rho) K^* polarization measurements, can reproduce the fT/fL data in B -> \phi K_2^* only if the B -> T form factors obey a certain hierarchy. Finally, we present the general angular analysis which can be used to get helicity information using two- and three-body decays.
[ { "version": "v1", "created": "Wed, 14 Nov 2007 04:36:50 GMT" }, { "version": "v2", "created": "Sat, 28 Jun 2008 04:39:32 GMT" } ]
2008-11-26T00:00:00
[ [ "Datta", "Alakabha", "" ], [ "Gao", "Yanyan", "" ], [ "Gritsan", "Andrei V.", "" ], [ "London", "David", "" ], [ "Nagashima", "Makiko", "" ], [ "Szynkman", "Alejandro", "" ] ]
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