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712.0579
Henrik Beuther
H. Beuther and A. Walsh
Kinematics of a hot massive accretion disk candidate
5 pages, 3 figures, accepted for Astrophysical Journal Letters, a high-resolution version of the draft can be found at http://www.mpia.de/homes/beuther/papers.html
null
10.1086/527434
null
astro-ph
null
Characterizing rotation, infall and accretion disks around high-mass protostars is an important topic in massive star formation research. With the Australia Telescope Compact Array and the Very Large Array we studied a massive disk candidate at high angular resolution in ammonia (NH3(4,4) & (5,5)) tracing the warm disk but not the envelope. The observations resolved at ~0.4'' resolution (corresponding to ~1400AU) a velocity gradient indicative of rotation perpendicular to the molecular outflow. Assuming a Keplerian accretion disk, the estimated protostar-disk mass would be high, similar to the protostellar mass. Furthermore, the position-velocity diagram exhibits additional deviation from a Keplerian rotation profile which may be caused by infalling gas and/or a self-gravitating disk. Moreover, a large fraction of the rotating gas is at temperatures >100K, markedly different to typical low-mass accretion disks. In addition, we resolve a central double-lobe cm continuum structure perpendicular to the rotation. We identify this with an ionized, optically thick jet.
[ { "version": "v1", "created": "Tue, 4 Dec 2007 17:10:36 GMT" } ]
2009-11-13T00:00:00
[ [ "Beuther", "H.", "" ], [ "Walsh", "A.", "" ] ]
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712.058
Carlo Marinelli
Stefano Bonaccorsi, Carlo Marinelli, Giacomo Ziglio
Stochastic FitzHugh-Nagumo equations on networks with impulsive noise
18 pages. Minor revision
null
null
null
math.AP math.PR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We consider a system of nonlinear partial differential equations with stochastic dynamical boundary conditions that arises in models of neurophysiology for the diffusion of electrical potentials through a finite network of neurons. Motivated by the discussion in the biological literature, we impose a general diffusion equation on each edge through a generalized version of the FitzHugh-Nagumo model, while the noise acting on the boundary is described by a generalized stochastic Kirchhoff law on the nodes. In the abstract framework of matrix operators theory, we rewrite this stochastic boundary value problem as a stochastic evolution equation in infinite dimensions with a power-type nonlinearity, driven by an additive L\'evy noise. We prove global well-posedness in the mild sense for such stochastic partial differential equation by monotonicity methods.
[ { "version": "v1", "created": "Tue, 4 Dec 2007 17:13:22 GMT" }, { "version": "v2", "created": "Sat, 9 Aug 2008 21:06:00 GMT" } ]
2008-08-10T00:00:00
[ [ "Bonaccorsi", "Stefano", "" ], [ "Marinelli", "Carlo", "" ], [ "Ziglio", "Giacomo", "" ] ]
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712.0581
Rachel Scherr
Rachel E. Scherr
Gesture analysis for physics education researchers
14 pages
null
10.1103/PhysRevSTPER.4.010101
null
physics.ed-ph
null
Systematic observations of student gestures can not only fill in gaps in students' verbal expressions, but can also offer valuable information about student ideas, including their source, their novelty to the speaker, and their construction in real time. This paper provides a review of the research in gesture analysis that is most relevant to physics education researchers and illustrates gesture analysis for the purpose of better understanding student thinking about physics.
[ { "version": "v1", "created": "Tue, 4 Dec 2007 18:07:46 GMT" } ]
2009-11-13T00:00:00
[ [ "Scherr", "Rachel E.", "" ] ]
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712.0582
Javier Graci\'a-Carpio
J. Gracia-Carpio (1 and 2), S. Garcia-Burillo (2), P. Planesas (2), A. Fuente (2) and A. Usero (2 and 3) ((1) FRACTAL S.L.N.E., (2) Observatorio Astronomico Nacional, (3) Centre for Astrophysics Research, University of Hertfordshire)
Evidence of enhanced star formation efficiency in luminous and ultraluminous infrared galaxies
15 pages, 9 figures. Accepted for publication in A&A
null
10.1051/0004-6361:20078223
null
astro-ph
null
We present new observations made with the IRAM 30m telescope of the J=1-0 and 3-2 lines of HCN and HCO^+ used to probe the dense molecular gas content in a sample of 17 local luminous and ultraluminous infrared galaxies (LIRGs and ULIRGs). These observations have allowed us to derive an updated version of the power law describing the correlation between the FIR luminosity (L_FIR) and the HCN(1-0) luminosity (L'_HCN(1-0)) of local and high-redshift galaxies. We present the first clear observational evidence that the star formation efficiency of the dense gas (SFE_dense), measured as the L_FIR/L'_HCN(1-0) ratio, is significantly higher in LIRGs and ULIRGs than in normal galaxies, a result that has also been found recently in high-redshift galaxies. This may imply a statistically significant turn upward in the Kennicutt-Schmidt law derived for the dense gas at L_FIR >= 10^11 L_sun. We have used a one-phase Large Velocity Gradient (LVG) radiative transfer code to fit the three independent line ratios derived from our observations. The results of this analysis indicate that the [HCN]/[HCO^+] abundance ratios could be up to one order of magnitude higher than normal in a significant number of LIRGs and ULIRGs of our sample. An overabundance of HCN at high L_FIR implies that the reported trend in the L_FIR/L'_HCN ratio as a function of L_FIR would be underestimating a potentially more dramatic change of the SFE_dense. Results obtained with two-phase LVG models corroborate that the L'_HCN(1-0)-to-M_dense conversion factor must be lowered at high L_FIR. We discuss the implications of these findings for the use of HCN as a tracer of the dense molecular gas in local and high-redshift luminous infrared galaxies.
[ { "version": "v1", "created": "Tue, 4 Dec 2007 18:33:01 GMT" } ]
2009-11-13T00:00:00
[ [ "Gracia-Carpio", "J.", "", "1 and 2" ], [ "Garcia-Burillo", "S.", "", "2 and 3" ], [ "Planesas", "P.", "", "2 and 3" ], [ "Fuente", "A.", "", "2 and 3" ], [ "Usero", "A.", "", "2 and 3" ] ]
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712.0583
Jean-Pierre Francoise
J.-P. Francoise, C. Piquet and A. Vidal
Enhanced delay to Bifurcation
7 pages
null
null
null
math.DS math.CA
null
This article provides an example of fast-slow system such that most orbits remain as close as possible to the unstable manifold of the fast dynamics for an arbitrarily long time.
[ { "version": "v1", "created": "Tue, 4 Dec 2007 18:18:35 GMT" } ]
2009-02-19T00:00:00
[ [ "Francoise", "J. -P.", "" ], [ "Piquet", "C.", "" ], [ "Vidal", "A.", "" ] ]
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712.0584
Lajos Soukup
Juan Carlos Martinez, Lajos Soukup
Cardinal sequences of LCS spaces under GCH
null
null
null
null
math.LO math.GN
null
We give full characterization of the sequences of regular cardinals that may arise as cardinal sequences of locally compact scattered spaces under GCH. The proofs are based on constructions of universal locally compact scattered spaces.
[ { "version": "v1", "created": "Tue, 4 Dec 2007 18:19:30 GMT" } ]
2007-12-05T00:00:00
[ [ "Martinez", "Juan Carlos", "" ], [ "Soukup", "Lajos", "" ] ]
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712.0585
Dmitri Nikshych
Dmitri Nikshych
Non group-theoretical semisimple Hopf algebras from group actions on fusion categories
LaTeX, 15 pages
Selecta Math. 14 (2008), 145-161.
null
null
math.QA
null
Given an action of a finite group G on a fusion category C we give a criterion for the category of G-equivariant objects in C to be group-theoretical, i.e., to be categorically Morita equivalent to a category of group-graded vector spaces. We use this criterion to answer affirmatively the question about existence of non group-theoretical semisimple Hopf algebras asked by P. Etingof, V. Ostrik, and the author in math/0203060. Namely, we show that certain Z/2Z-equivariantizations of fusion categories constructed by D. Tambara and S. Yamagami are equivalent to representation categories of non group-theoretical semisimple Hopf algebras. We describe these Hopf algebras as extensions and show that they are upper and lower semisolvable.
[ { "version": "v1", "created": "Tue, 4 Dec 2007 18:35:19 GMT" } ]
2009-05-19T00:00:00
[ [ "Nikshych", "Dmitri", "" ] ]
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712.0586
Dieter Bauer
S.V. Popruzhenko, M. Kundu, D.F. Zaretsky, D. Bauer
Harmonic emission from cluster nanoplasmas subject to intense short laser pulses
12 pages, 7 figures, RevTeX
null
10.1103/PhysRevA.77.063201
null
physics.plasm-ph physics.atm-clus
null
Harmonic emission from cluster nanoplasmas subject to short intense infrared laser pulses is studied. In a previous publication [M. Kundu et al., Phys. Rev. A 76, 033201 (2007)] we reported particle-in-cell simulation results showing resonant enhancements of low-order harmonics when the Mie plasma frequency of the ionizing and expanding cluster resonates with the respective harmonic frequency. Simultaneously we found that high-order harmonics were barely present in the spectrum, even at high intensities. The current paper is focused on the analytical modeling of the process. We show that dynamical stochasticity owing to nonlinear resonance inhibits the emission of high order harmonics.
[ { "version": "v1", "created": "Tue, 4 Dec 2007 18:26:24 GMT" }, { "version": "v2", "created": "Wed, 7 May 2008 18:28:25 GMT" } ]
2009-11-13T00:00:00
[ [ "Popruzhenko", "S. V.", "" ], [ "Kundu", "M.", "" ], [ "Zaretsky", "D. F.", "" ], [ "Bauer", "D.", "" ] ]
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712.0587
Alexander K. Hartmann
Martin Zumsande, Mikko J. Alava and Alexander K. Hartmann
First excitations in two- and three-dimensional random-field Ising systems
17 pages, 12 figures
null
10.1088/1742-5468/2008/02/P02012
null
cond-mat.dis-nn cond-mat.stat-mech
null
We present results on the first excited states for the random-field Ising model. These are based on an exact algorithm, with which we study the excitation energies and the excitation sizes for two- and three-dimensional random-field Ising systems with a Gaussian distribution of the random fields. Our algorithm is based on an approach of Frontera and Vives which, in some cases, does not yield the true first excited states. Using the corrected algorithm, we find that the order-disorder phase transition for three dimensions is visible via crossings of the excitations-energy curves for different system sizes, while in two-dimensions these crossings converge to zero disorder. Furthermore, we obtain in three dimensions a fractal dimension of the excitations cluster of d_s=2.42(2). We also provide analytical droplet arguments to understand the behavior of the excitation energies for small and large disorder as well as close to the critical point.
[ { "version": "v1", "created": "Tue, 4 Dec 2007 18:27:53 GMT" } ]
2009-11-13T00:00:00
[ [ "Zumsande", "Martin", "" ], [ "Alava", "Mikko J.", "" ], [ "Hartmann", "Alexander K.", "" ] ]
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712.0588
Jerome Bobin
J. Bobin, Y. Moudden, J.-L. Starck, J. Fadili, N. Aghanim
SZ and CMB reconstruction using Generalized Morphological Component Analysis
11 pages - Statistical Methodology - Special Issue on Astrostatistics - in press
null
10.1016/j.stamet.2007.10.003
null
astro-ph
null
In the last decade, the study of cosmic microwave background (CMB) data has become one of the most powerful tools to study and understand the Universe. More precisely, measuring the CMB power spectrum leads to the estimation of most cosmological parameters. Nevertheless, accessing such precious physical information requires extracting several different astrophysical components from the data. Recovering those astrophysical sources (CMB, Sunyaev-Zel'dovich clusters, galactic dust) thus amounts to a component separation problem which has already led to an intense activity in the field of CMB studies. In this paper, we introduce a new sparsity-based component separation method coined Generalized Morphological Component Analysis (GMCA). The GMCA approach is formulated in a Bayesian maximum a posteriori (MAP) framework. Numerical results show that this new source recovery technique performs well compared to state-of-the-art component separation methods already applied to CMB data.
[ { "version": "v1", "created": "Tue, 4 Dec 2007 18:41:50 GMT" } ]
2009-11-13T00:00:00
[ [ "Bobin", "J.", "" ], [ "Moudden", "Y.", "" ], [ "Starck", "J. -L.", "" ], [ "Fadili", "J.", "" ], [ "Aghanim", "N.", "" ] ]
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712.0589
Peter Lunkenheimer
P. Lunkenheimer, L. C. Pardo, M. K\"ohler, and A. Loidl
Broadband dielectric spectroscopy on benzophenone: alpha relaxation, beta relaxation, and mode coupling theory
11 pages, 7 figures; revised version with new Fig. 5 and some smaller changes according to referees' demands
Phys. Rev. E 77, 031506 (2008)
10.1103/PhysRevE.77.031506
null
cond-mat.dis-nn cond-mat.soft
null
We have performed a detailed dielectric investigation of the relaxational dynamics of glass-forming benzophenone. Our measurements cover a broad frequency range of 0.1 Hz to 120 GHz and temperatures from far below the glass temperature well up into the region of the small-viscosity liquid. With respect to the alpha relaxation this material can be characterized as a typical molecular glass former with rather high fragility. A good agreement of the alpha relaxation behavior with the predictions of the mode coupling theory of the glass transition is stated. In addition, at temperatures below and in the vicinity of Tg we detect a well-pronounced beta relaxation of Johari-Goldstein type, which with increasing temperature develops into an excess wing. We compare our results to literature data from optical Kerr effect and depolarized light scattering experiments, where an excess-wing like feature was observed in the 1 - 100 GHz region. We address the question if the Cole-Cole peak, which was invoked to describe the optical Kerr effect data within the framework of the mode coupling theory, has any relation to the canonical beta relaxation detected by dielectric spectroscopy.
[ { "version": "v1", "created": "Tue, 4 Dec 2007 19:02:10 GMT" }, { "version": "v2", "created": "Fri, 8 Feb 2008 13:04:03 GMT" } ]
2008-04-15T00:00:00
[ [ "Lunkenheimer", "P.", "" ], [ "Pardo", "L. C.", "" ], [ "Köhler", "M.", "" ], [ "Loidl", "A.", "" ] ]
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712.059
Thomas Faulkner
Qudsia J. Ejaz, Thomas Faulkner, Hong Liu, Krishna Rajagopal and Urs Achim Wiedemann
A limiting velocity for quarkonium propagation in a strongly coupled plasma via AdS/CFT
57 pages, 12 figures; references added
JHEP0804:089,2008
10.1088/1126-6708/2008/04/089
MIT-CTP-3912, CERN-PH-TH/2007-232, CAS-KITPC/ITP-024
hep-th hep-ph nucl-th
null
We study the dispersion relations of mesons in a particular hot strongly coupled supersymmetric gauge theory plasma. We find that at large momentum k the dispersion relations become omega = v_0 k + a + b/k + ..., where the limiting velocity v_0 is the same for mesons with any quantum numbers and depends only on the ratio of the temperature to the quark mass T/m_q. We compute a and b in terms of the meson quantum numbers and T/m_q. The limiting meson velocity v_0 becomes much smaller than the speed of light at temperatures below but close to T_diss, the temperature above which no meson bound states at rest in the plasma are found. From our result for v_0, we find that the temperature above which no meson bound states with velocity v exist is T_diss(v) \simeq (1-v^2)^(1/4) T_diss, up to few percent corrections.We thus confirm by direct calculation of meson dispersion relations a result inferred indirectly in previous work via analysis of the screening length between a static quark and antiquark in a moving plasma. Although we do not do our calculations in QCD, we argue that the qualitative features of the dispersion relation we compute, including in particular the relation between dissociation temperature and meson velocity, may apply to bottomonium and charmonium mesons propagating in the strongly coupled plasma of QCD. We discuss how our results can contribute to understanding quarkonium physics in heavy ion collisions.
[ { "version": "v1", "created": "Tue, 4 Dec 2007 19:10:26 GMT" }, { "version": "v2", "created": "Tue, 8 Jan 2008 03:47:35 GMT" } ]
2008-11-26T00:00:00
[ [ "Ejaz", "Qudsia J.", "" ], [ "Faulkner", "Thomas", "" ], [ "Liu", "Hong", "" ], [ "Rajagopal", "Krishna", "" ], [ "Wiedemann", "Urs Achim", "" ] ]
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712.0591
Janak Ramakrishnan
Janak Ramakrishnan
Maximal small extensions of o-minimal structures
6 pages. To appear in Mathematical Logic Quarterly
null
10.1002/malq.200910102
null
math.LO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A proper elementary extension of a model is called small if it realizes no new types over any finite set in the base model. We answer a question of Marker, and show that it is possible to have an o-minimal structure with a maximal small extension. Our construction yields such a structure for any cardinality. We show that in some cases, notably when the base structure is countable, the maximal small extension has maximal possible cardinality.
[ { "version": "v1", "created": "Tue, 4 Dec 2007 19:24:32 GMT" }, { "version": "v2", "created": "Sun, 6 Sep 2009 13:39:40 GMT" }, { "version": "v3", "created": "Tue, 30 Mar 2010 12:56:05 GMT" } ]
2011-04-22T00:00:00
[ [ "Ramakrishnan", "Janak", "" ] ]
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712.0592
Miguel S\'anchez
Jos\'e Luis Flores, Miguel S\'anchez
The causal boundary of wave-type spacetimes
41 pages, 1 table. Included 4 new figures, and some small modifications. To appear in JHEP
JHEP0803:036,2008
10.1088/1126-6708/2008/03/036
null
gr-qc hep-th math-ph math.MP
null
A complete and systematic approach to compute the causal boundary of wave-type spacetimes is carried out. The case of a 1-dimensional boundary is specially analyzed and its critical appearance in pp-wave type spacetimes is emphasized. In particular, the corresponding results obtained in the framework of the AdS/CFT correspondence for holography on the boundary, are reinterpreted and very widely generalized. Technically, a recent new definition of causal boundary is used and stressed. Moreover, a set of mathematical tools is introduced (analytical functional approach, Sturm-Liouville theory, Fermat-type arrival time, Busemann-type functions).
[ { "version": "v1", "created": "Tue, 4 Dec 2007 19:26:46 GMT" }, { "version": "v2", "created": "Fri, 29 Feb 2008 18:38:08 GMT" } ]
2008-11-26T00:00:00
[ [ "Flores", "José Luis", "" ], [ "Sánchez", "Miguel", "" ] ]
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712.0593
Jean-Francois Marckert
Marie Albenque (LIAFA), Jean-Fran\c{c}ois Marckert (LaBRI)
Some families of increasing planar maps
null
null
null
null
math.PR math.CO
null
Stack-triangulations appear as natural objects when one wants to define some increasing families of triangulations by successive additions of faces. We investigate the asymptotic behavior of rooted stack-triangulations with $2n$ faces under two different distributions. We show that the uniform distribution on this set of maps converges, for a topology of local convergence, to a distribution on the set of infinite maps. In the other hand, we show that rescaled by $n^{1/2}$, they converge for the Gromov-Hausdorff topology on metric spaces to the continuum random tree introduced by Aldous. Under a distribution induced by a natural random construction, the distance between random points rescaled by $(6/11)\log n$ converge to 1 in probability. We obtain similar asymptotic results for a family of increasing quadrangulations.
[ { "version": "v1", "created": "Tue, 4 Dec 2007 19:29:04 GMT" } ]
2007-12-05T00:00:00
[ [ "Albenque", "Marie", "", "LIAFA" ], [ "Marckert", "Jean-François", "", "LaBRI" ] ]
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712.0594
John Orrell
R. Suarez, J. L. Orrell, C. E. Aalseth, T. W. Hossbach, and H. S. Miley
Real-time digital signal processor implementation of self-calibrating pulse-shape discriminator for high purity germanium
Accepted by NIM A
Nucl.Instrum.Meth.A586:276-285,2008
10.1016/j.nima.2007.11.075
PNNL-SA-55360
nucl-ex
null
Pulse-shape analysis of the ionization signals from germanium gamma-ray spectrometers is a method for obtaining information that can characterize an event beyond just the total energy deposited in the crystal. However, as typically employed, this method is data-intensive requiring the digitization, transfer, and recording of electronic signals from the spectrometer. A hardware realization of a real-time digital signal processor for implementing a parametric pulse shape is presented. Specifically, a previously developed method for distinguishing between single-site and multi-site gamma-ray interactions is demonstrated in an on-line digital signal processor, compared with the original off-line pulse-shape analysis routine, and shown to have no significant difference. Reduction of the amount of the recorded information per event is shown to translate into higher duty-cycle data acquisition rates while retaining the benefits of additional event characterization from pulse-shape analysis.
[ { "version": "v1", "created": "Tue, 4 Dec 2007 19:30:50 GMT" } ]
2008-11-26T00:00:00
[ [ "Suarez", "R.", "" ], [ "Orrell", "J. L.", "" ], [ "Aalseth", "C. E.", "" ], [ "Hossbach", "T. W.", "" ], [ "Miley", "H. S.", "" ] ]
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712.0595
David J. E. Floyd
David J. E. Floyd, David Axon, Stefi Baum, Alessandro Capetti, Marco Chiaberge, Duccio Macchetto, Juan Madrid, George Miley, Christopher P. O'Dea, Eric Perlman, Alice Quillen, William Sparks, Grant Tremblay
HST NIR Snapshot Survey of 3CR Radio Source Counterparts II: An Atlas and Inventory of the Host Galaxies, Mergers and Companions
ApJS, 177, 148: Final version; includes revised figures 1, 15b, and section 7.5 (and other minor changes from editing process. 65 pages, inc. 17 figures
null
10.1086/587622
STScI e-print #1789
astro-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We present the second part of an H-band (1.6 microns) atlas of z<0.3 3CR radio galaxies, using the Hubble Space Telescope Near Infrared Camera and Multi-Object Spectrometer (HST NICMOS2). We present new imaging for 21 recently acquired sources, and host galaxy modeling for the full sample of 101 (including 11 archival) -- an 87% completion rate. Two different modeling techniques are applied, following those adopted by the galaxy morphology and the quasar host galaxy communities. Results are compared, and found to be in excellent agreement, although the former breaks down in the case of strongly nucleated sources. Companion sources are tabulated, and the presence of mergers, tidal features, dust disks and jets are catalogued. The tables form a catalogue for those interested in the structural and morphological dust-free host galaxy properties of the 3CR sample, and for comparison with morphological studies of quiescent galaxies and quasar host galaxies. Host galaxy masses are estimated, and found to typically lie at around 2*10^11 solar masses. In general, the population is found to be consistent with the local population of quiescent elliptical galaxies, but with a longer tail to low Sersic index, mainly consisting of low-redshift (z<0.1) and low-radio-power (FR I) sources. A few unusually disky FR II host galaxies are picked out for further discussion. Nearby external sources are identified in the majority of our images, many of which we argue are likely to be companion galaxies or merger remnants. The reduced NICMOS data are now publicly available from our website (http://archive.stsci.edu/prepds/3cr/)
[ { "version": "v1", "created": "Tue, 4 Dec 2007 20:15:48 GMT" }, { "version": "v2", "created": "Fri, 11 Jul 2008 20:51:42 GMT" } ]
2008-07-11T00:00:00
[ [ "Floyd", "David J. E.", "" ], [ "Axon", "David", "" ], [ "Baum", "Stefi", "" ], [ "Capetti", "Alessandro", "" ], [ "Chiaberge", "Marco", "" ], [ "Macchetto", "Duccio", "" ], [ "Madrid", "Juan", "" ], [ "Miley", "George", "" ], [ "O'Dea", "Christopher P.", "" ], [ "Perlman", "Eric", "" ], [ "Quillen", "Alice", "" ], [ "Sparks", "William", "" ], [ "Tremblay", "Grant", "" ] ]
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712.0596
Dana P. Williams
Marius Ionescu (Cornell University) and Dana P. Williams (Dartmouth College)
Irreducible Representations of Groupoid $C^*$-algebras
10 Pages. Added examples and additional references
null
null
null
math.OA math.FA
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
If $G$ is a second countable locally compact Hausdorff groupoid with Haar system, we show that every representation induced from an irreducible representation of a stability group is irreducible.
[ { "version": "v1", "created": "Tue, 4 Dec 2007 19:41:16 GMT" }, { "version": "v2", "created": "Thu, 5 Jun 2008 12:47:33 GMT" } ]
2008-06-05T00:00:00
[ [ "Ionescu", "Marius", "", "Cornell University" ], [ "Williams", "Dana P.", "", "Dartmouth\n College" ] ]
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712.0597
Pavel Ostrovsky
P. M. Ostrovsky, I. V. Gornyi, A. D. Mirlin
Theory of Anomalous Quantum Hall Effects in Graphene
13 pages (article + supplementary material), 5 figures
Phys. Rev. B 77, 195430 (2008)
10.1103/PhysRevB.77.195430
null
cond-mat.mes-hall cond-mat.dis-nn
null
Recent successes in manufacturing of atomically thin graphite samples (graphene) have stimulated intense experimental and theoretical activity. The key feature of graphene is the massless Dirac type of low-energy electron excitations. This gives rise to a number of unusual physical properties of this system distinguishing it from conventional two-dimensional metals. One of the most remarkable properties of graphene is the anomalous quantum Hall effect. It is extremely sensitive to the structure of the system; in particular, it clearly distinguishes single- and double-layer samples. In spite of the impressive experimental progress, the theory of quantum Hall effect in graphene has not been established. This theory is a subject of the present paper. We demonstrate that the Landau level structure by itself is not sufficient to determine the form of the quantum Hall effect. The Hall quantization is due to Anderson localization which, in graphene, is very peculiar and depends strongly on the character of disorder. It is only a special symmetry of disorder that may give rise to anomalous quantum Hall effects in graphene. We analyze the symmetries of disordered single- and double-layer graphene in magnetic field and identify the conditions for anomalous Hall quantization.
[ { "version": "v1", "created": "Tue, 4 Dec 2007 19:49:07 GMT" } ]
2008-05-23T00:00:00
[ [ "Ostrovsky", "P. M.", "" ], [ "Gornyi", "I. V.", "" ], [ "Mirlin", "A. D.", "" ] ]
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712.0598
Gregorio Bernardi
D0 Collaboration: V. M. Abazov, et al
A combined search for the standard model Higgs boson at sqrt{s}=1.96 TeV
Submitted to Physics Letters B
Phys.Lett.B663:26-36,2008
10.1016/j.physletb.2008.02.069
FERMILAB-PUB-07/640-E
hep-ex
null
We present new results of the search for WH to lepton neutrino b b production in ppbar collisions at a center of mass energy of sqrt{s}=1.96 TeV, based on a dataset with integrated luminosity of 0.44 fb-1. We combine these new results with previously published searches by the D0 collaboration, for WH and ZH production analyzed in the MET b b final state, for ZH (to l+l- b b) production, for WH (to WWW) production, and for H (to WW) direct production. No signal-like excess is observed either in the WH analysis or in the combination of all D0 Higgs boson analyses. We set 95% C.L. (expected) upper limits on to 1.9 (3.3) pb for Higgs boson masses between 105 and 145 GeV, to be compared to the theoretical prediction of 0.13 pb for a standard model (SM) Higgs boson with mass m_H=115 GeV. After combination with the other D0 Higgs boson searches, we obtain for m_H=115 GeV an observed (expected) limit 8.5 (12.1) times higher than the SM predicted Higgs boson production cross section. For m_H=160 GeV, the corresponding observed (expected) ratio is 10.2 (9.0).
[ { "version": "v1", "created": "Tue, 4 Dec 2007 19:49:22 GMT" } ]
2008-11-26T00:00:00
[ [ "D0 Collaboration", "", "" ], [ "Abazov", "V. M.", "" ] ]
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712.0599
Chad Jarvis Dr.
D0 Collaboration, V. Abazov, et al
Search for ZZ and Z\gamma^* production in p-barp collisions at sqrt(s) = 1.96 TeV and limits on anomalous ZZZ and ZZ\gamma^* couplings
submitted to Phys. Rev. Lett
Phys.Rev.Lett.100:131801,2008
10.1103/PhysRevLett.100.131801
FERMILAB-PUB-07-641-E
hep-ex
null
We present a study of four muon, four electron, and two muon two electron events using 1 fb^(-1) of data collected with the D0 detector at the Fermilab Tevatron p-barp Collider at sqrt(s) = 1.96 TeV. Requiring the lepton pair masses to be greater than 30 GeV, we observe one event, consistent with the expected background of 0.13 +- 0.03 events and with the predicted standard model ZZ and Z\gamma^* production of 1.71 +-0.15 events. We set an upper limit on the ZZ and Z\gamma^* cross section of 4.4 pb at the 95% C.L. We also derive limits on anomalous neutral trilinear ZZZ and ZZ\gamma^* gauge couplings. The one-parameter 95%$ C.L. coupling limits with a form factor scale Lambda = 1.2 TeV are -0.28 < f_(40)^Z < 0.28, -0.31 < f_(50)^Z < 0.29, -0.26 < f_(40)^\gamma < 0.26, and -0.30 < f_(5 0)^\gamma < 0.28.
[ { "version": "v1", "created": "Tue, 4 Dec 2007 20:25:26 GMT" } ]
2008-11-26T00:00:00
[ [ "D0 Collaboration", "", "" ], [ "Abazov", "V.", "" ] ]
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712.06
Miguel S\'anchez
Miguel Sanchez
Some remarks on Causality Theory and Variational Methods in Lorentzian manifolds
12 pages, no figures, latex; published conference
Conf.Semin.Mat.Univ.BariNo.265(1997)
null
null
gr-qc
null
In this conference published in 1997 some problems on the geodesics of a Lorentzian manifold concerning causality and infinite-dimensional variational methods, are pointed out. Even though a big progress on many of these questions have been carried out since then, some computations in this paper may be useful and have not been published elsewhere. Among them, for example, the following one (Section 3). Consider a spacetime which can be written globally as a product $R x M$, such that the natural vector field associated to the coordinate $t$ in $R$ is timelike. When is this spacetime globally hyperbolic with Cauchy hypersurfaces the slices $t=$ constant?
[ { "version": "v1", "created": "Tue, 4 Dec 2007 20:04:49 GMT" }, { "version": "v2", "created": "Fri, 29 Feb 2008 18:23:06 GMT" } ]
2008-11-26T00:00:00
[ [ "Sanchez", "Miguel", "" ] ]
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712.0601
Tae-Hun Lee
Tae-Hun Lee
One-loop effective brane action
12 pages, no figure
JHEP 0808:039,2008
10.1088/1126-6708/2008/08/039
null
hep-th
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The one-loop effective action for a $p$ brane embedded in a $D=p+2$ Minkowski spacetime in the static gauge is calculated. Rescaling the quantum fluctuation by $\sqrt{-g_0}$ evaluated on the background brane leads to the one-loop effective action expressed only in terms of infrared and ultraviolet divergent geometric scalars. After the infrared divergences are absorbed into the quantum fluctuation, there remains the finite number of ultraviolet divergences. This implies that the $D=p+2$ Poincar\'{e} symmetry and the $D=p+1$ general coordinate invariance are preserved in one-loop order.
[ { "version": "v1", "created": "Tue, 4 Dec 2007 20:13:27 GMT" }, { "version": "v2", "created": "Fri, 11 Jan 2008 00:32:48 GMT" }, { "version": "v3", "created": "Fri, 18 Jan 2008 16:39:42 GMT" }, { "version": "v4", "created": "Tue, 12 Feb 2008 20:57:14 GMT" }, { "version": "v5", "created": "Sat, 23 Feb 2008 21:28:00 GMT" }, { "version": "v6", "created": "Mon, 7 Jul 2008 01:56:20 GMT" }, { "version": "v7", "created": "Fri, 8 Aug 2008 15:32:28 GMT" } ]
2010-02-03T00:00:00
[ [ "Lee", "Tae-Hun", "" ] ]
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712.0602
Annalisa Calamida
A. Calamida, C.E. Corsi, G. Bono (OAR/INAF), P.B. Stetson (HIA/NRC), P.G. Prada Moroni, S. Degl'Innocenti (Univ. Pisa), I. Ferraro, G. Iannicola (OAR/INAF), D. Koester (Univ. Kiel), L. Pulone (OAR/INAF), M. Monelli (IAC), P. Amico (ESO), R. Buonanno (Univ. Rome), L.M. Freyhammer (Univ. Lancashire), E. Marchetti (ESO), M. Nonino (OAT/INAF), M. Romaniello (ESO)
On the radial distribution of white dwarfs in the Galactic globular cluster Omega Cen
5 pages, 2 figures, to appear in Mem. Soc. Astr. Italiana, Vol. 79/2 (proceeding Cefalu' Workshop "XXI Century Challenges for Stellar Evolution", ed. S. Cassisi & M. Salaris)
null
null
null
astro-ph
null
We present deep and accurate photometry (F435W, F625W, F658N) of the Galactic Globular Cluster Omega Cen collected with the Advanced Camera for Surveys (ACS) on board the Hubble Space Telescope (HST). We identified ~ 6,500 white dwarf (WD)candidates and compared their radial distribution with that of Main Sequence (MS) stars. We found a mild evidence that young WDs (0.1 < t < 0.6 Gyr) are less centrally concentrated when compared to MS stars in the magnitude range 25 < F435W < 26.5.
[ { "version": "v1", "created": "Tue, 4 Dec 2007 20:23:36 GMT" } ]
2007-12-05T00:00:00
[ [ "Calamida", "A.", "", "OAR/INAF" ], [ "Corsi", "C. E.", "", "OAR/INAF" ], [ "Bono", "G.", "", "OAR/INAF" ], [ "Stetson", "P. B.", "", "HIA/NRC" ], [ "Moroni", "P. G. Prada", "", "Univ. Pisa" ], [ "Degl'Innocenti", "S.", "", "Univ. Pisa" ], [ "Ferraro", "I.", "", "OAR/INAF" ], [ "Iannicola", "G.", "", "OAR/INAF" ], [ "Koester", "D.", "", "Univ. Kiel" ], [ "Pulone", "L.", "", "OAR/INAF" ], [ "Monelli", "M.", "", "IAC" ], [ "Amico", "P.", "", "ESO" ], [ "Buonanno", "R.", "", "Univ. Rome" ], [ "Freyhammer", "L. M.", "", "Univ. Lancashire" ], [ "Marchetti", "E.", "", "ESO" ], [ "Nonino", "M.", "", "OAT/INAF" ], [ "Romaniello", "M.", "", "ESO" ] ]
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712.0603
Annalisa Calamida
A. Calamida, C.E. Corsi, G. Bono (OAR/INAF), P.B. Stetson (HIA/NRC), P.G. Prada Moroni, S. Degl'Innocenti (Univ. Pisa), I. Ferraro, G. Iannicola (OAR/INAF), D. Koester (Univ. Kiel), L. Pulone (OAR/INAF), M. Monelli (IAC), P. Amico (ESO), R. Buonanno (Univ. Rome), F. Caputo (OAR/INAF), S. D'Odorico (ESO), L.M. Freyhammer (Univ. Lancashire), E. Marchetti (ESO), M. Nonino (OAT/INAF), M. Romaniello (ESO)
On the white dwarf cooling sequence of the globular cluster Omega Centauri
14 pages, 3 figures, accepted for publication to ApJ
null
10.1086/527436
null
astro-ph
null
We present deep and precise photometry (F435, F625W, F658N) of Omega Cen collected with the Advanced Camera for Surveys (ACS) on board the Hubble Space Telescope (HST). We have identified ~ 6,500 white dwarf (WD) candidates, and the ratio of WD and Main Sequence (MS) star counts is found to be at least a factor of two larger than the ratio of CO-core WD cooling and MS lifetimes. This discrepancy is not explained by the possible occurrence of a He-enhanced stellar population, since the MS lifetime changes by only 15% when changing from a canonical (Y=0.25) to a He-enhanced composition (Y=0.42). The presence of some He-core WDs seems able to explain the observed star counts. The fraction of He WDs required ranges from 10% to 80% depending on their mean mass and it is at least five times larger than for field WDs. The comparison in the Color Magnitude Diagram between theory and observations also supports the presence of He WDs. Empirical evidence indicates that He WDs have been detected in stellar systems hosting a large sample of extreme horizontal branch stars, thus suggesting that a fraction of red giants might avoid the He-core flash.
[ { "version": "v1", "created": "Tue, 4 Dec 2007 20:34:27 GMT" } ]
2009-11-13T00:00:00
[ [ "Calamida", "A.", "", "OAR/INAF" ], [ "Corsi", "C. E.", "", "OAR/INAF" ], [ "Bono", "G.", "", "OAR/INAF" ], [ "Stetson", "P. B.", "", "HIA/NRC" ], [ "Moroni", "P. G. Prada", "", "Univ. Pisa" ], [ "Degl'Innocenti", "S.", "", "Univ. Pisa" ], [ "Ferraro", "I.", "", "OAR/INAF" ], [ "Iannicola", "G.", "", "OAR/INAF" ], [ "Koester", "D.", "", "Univ. Kiel" ], [ "Pulone", "L.", "", "OAR/INAF" ], [ "Monelli", "M.", "", "IAC" ], [ "Amico", "P.", "", "ESO" ], [ "Buonanno", "R.", "", "Univ. Rome" ], [ "Caputo", "F.", "", "OAR/INAF" ], [ "D'Odorico", "S.", "", "ESO" ], [ "Freyhammer", "L. M.", "", "Univ. Lancashire" ], [ "Marchetti", "E.", "", "ESO" ], [ "Nonino", "M.", "", "OAT/INAF" ], [ "Romaniello", "M.", "", "ESO" ] ]
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712.0604
Koji Terashi
CDF Collaboration: T. Aaltonen, et al
Observation of Exclusive Dijet Production at the Fermilab Tevatron p-pbar Collider
Submitted to Phys. Rev. D Updated with PRD referee's comments
Phys.Rev.D77:052004,2008
10.1103/PhysRevD.77.052004
FERMILAB-PUB-07-647-E
hep-ex
null
We present the first observation and cross section measurement of exclusive dijet production in pbar-p interactions, pbar + p --> pbar + dijet + p. Using a data sample of 310 pb-1 collected by the Run II Collider Detector at Fermilab at sqrt{s}=1.96 TeV, exclusive cross sections for events with two jets of transverse energy ET >= 10 GeV have been measured as a function of minimum ET(jet). The exclusive signal is extracted from fits to data distributions based on Monte Carlo simulations of expected dijet signal and background shapes. The simulated background distribution shapes are checked in a study of a largely independent data sample of 200 pb-1 of b-tagged jet events, where exclusive dijet production is expected to be suppressed by the Jz=0 total angular momentum selection rule. Results obtained are compared with theoretical expectations, and implications for exclusive Higgs boson production at the pp Large Hadron Collider at sqrt{s}=14 TeV are discussed.
[ { "version": "v1", "created": "Tue, 4 Dec 2007 20:36:40 GMT" }, { "version": "v2", "created": "Wed, 5 Dec 2007 09:29:35 GMT" }, { "version": "v3", "created": "Fri, 18 Jan 2008 02:25:35 GMT" } ]
2010-05-12T00:00:00
[ [ "CDF Collaboration", "", "" ], [ "Aaltonen", "T.", "" ] ]
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712.0605
Vadim Markel
Vadim A. Markel
Correct Definition of the Poynting Vector in Electrically and Magnetically Polarizable Medium Reveals that Negative Refraction is Impossible
12 pages, 2 figures. Significantly expanded and notations changed for improved clarity
Optics Express 16(23), 19152-19168 (2008)
10.1364/OE.16.019152
null
physics.optics
null
I compute from first principles the local heating rate $q$ (the amount of electromagnetic energy converted to heat per unit time per unit volume) for electromagnetic waves propagating in magnetically and electrically polarizable media. I find that, in magnetic media, this rate has two separate contributions, $q^{(V)}$ and $q^{(S)}$, the first coming from the volume of the medium and the second from its surface. I argue that the second law of thermodynamics requires that the volume contribution be positive and that this requirement, in turn, prohibits negative refraction. This result holds for active or passive media and in the presence of anisotropy and spatial dispersion.
[ { "version": "v1", "created": "Tue, 4 Dec 2007 20:37:12 GMT" }, { "version": "v2", "created": "Thu, 3 Apr 2008 14:51:28 GMT" } ]
2008-11-07T00:00:00
[ [ "Markel", "Vadim A.", "" ] ]
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712.0606
J. P. Wittmer
H. Meyer, J.P. Wittmer, T. Kreer, P. Beckrich, A. Johner, J. Farago, J. Baschnagel
Static Rouse Modes and Related Quantities: Corrections to Chain Ideality in Polymer Melts
9 pages, 7 figures, accepted for publication in EPJE
null
10.1140/epje/i2007-10250-0
null
cond-mat.soft cond-mat.stat-mech
null
Following the Flory ideality hypothesis intrachain and interchain excluded volume interactions are supposed to compensate each other in dense polymer systems. Multi-chain effects should thus be neglected and polymer conformations may be understood from simple phantom chain models. Here we provide evidence against this phantom chain, mean-field picture. We analyze numerically and theoretically the static correlation function of the Rouse modes. Our numerical results are obtained from computer simulations of two coarse-grained polymer models for which the strength of the monomer repulsion can be varied, from full excluded volume (`hard monomers') to no excluded volume (`phantom chains'). For nonvanishing excluded volume we find the simulated correlation function of the Rouse modes to deviate markedly from the predictions of phantom chain models. This demonstrates that there are nonnegligible correlations along the chains in a melt. These correlations can be taken into account by perturbation theory. Our simulation results are in good agreement with these new theoretical predictions.
[ { "version": "v1", "created": "Tue, 4 Dec 2007 20:57:53 GMT" } ]
2009-11-13T00:00:00
[ [ "Meyer", "H.", "" ], [ "Wittmer", "J. P.", "" ], [ "Kreer", "T.", "" ], [ "Beckrich", "P.", "" ], [ "Johner", "A.", "" ], [ "Farago", "J.", "" ], [ "Baschnagel", "J.", "" ] ]
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712.0607
Stephan Schlamminger
S. Schlamminger, K.-Y. Choi, T. A. Wagner, J. H. Gundlach, E. G. Adelberger
Test of the Equivalence Principle Using a Rotating Torsion Balance
4 pages, 4 figures; accepted for publication in PRL
Phys.Rev.Lett.100:041101,2008
10.1103/PhysRevLett.100.041101
null
gr-qc
null
We used a continuously rotating torsion balance instrument to measure the acceleration difference of beryllium and titanium test bodies towards sources at a variety of distances. Our result Delta a=(0.6+/-3.1)x10^-15 m/s^2 improves limits on equivalence-principle violations with ranges from 1 m to infinity by an order of magnitude. The Eoetvoes parameter is eta=(0.3+/-1.8)x10^-13. By analyzing our data for accelerations towards the center of the Milky Way we find equal attractions of Be and Ti towards galactic dark matter, yielding eta=(-4 +/- 7)x10^-5. Space-fixed differential accelerations in any direction are limited to less than 8.8x10^-15 m/s^2 with 95% confidence.
[ { "version": "v1", "created": "Tue, 4 Dec 2007 20:50:21 GMT" } ]
2008-11-26T00:00:00
[ [ "Schlamminger", "S.", "" ], [ "Choi", "K. -Y.", "" ], [ "Wagner", "T. A.", "" ], [ "Gundlach", "J. H.", "" ], [ "Adelberger", "E. G.", "" ] ]
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712.0608
Mats Ehrnstr\"om
Mats Ehrnstrom and Gabriele Villari
Linear water waves with vorticity: rotational features and particle paths
null
null
null
null
math-ph math.AP math.MP
null
Steady linear gravity waves of small amplitude travelling on a current of constant vorticity are found. For negative vorticity we show the appearance of internal waves and vortices, wherein the particle trajectories are not any more closed ellipses. For positive vorticity the situation resembles that of Stokes waves, but for large vorticity the trajectories are affected.
[ { "version": "v1", "created": "Tue, 4 Dec 2007 20:53:39 GMT" } ]
2007-12-05T00:00:00
[ [ "Ehrnstrom", "Mats", "" ], [ "Villari", "Gabriele", "" ] ]
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712.0609
Ethan Neil
Thomas Appelquist, George T. Fleming and Ethan T. Neil
Lattice Study of the Conformal Window in QCD-like Theories
4 pages, 2 figures. v2: assorted edits for style and length
Phys.Rev.Lett.100:171607,2008; Erratum-ibid.102:149902,2009
10.1103/PhysRevLett.100.171607
null
hep-ph hep-lat
null
Using lattice simulations, we study the extent of the conformal window for an $\text{SU}(3)$ gauge theory with $N_f$ Dirac fermions in the fundamental representation. We present evidence that the infrared behavior is conformal for $12 \leq N_f \leq 16$, governed by an infrared fixed point, while confinement and chiral symmetry breaking are present for $N_f \leq 8$.
[ { "version": "v1", "created": "Tue, 4 Dec 2007 20:54:52 GMT" }, { "version": "v2", "created": "Mon, 5 May 2008 17:46:40 GMT" } ]
2009-12-15T00:00:00
[ [ "Appelquist", "Thomas", "" ], [ "Fleming", "George T.", "" ], [ "Neil", "Ethan T.", "" ] ]
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712.061
Brad Spitzbart
Owen W. Westbrook, Nancy Remage Evans, Scott J. Wolk, Vinay L. Kashyap, Joy S. Nichols, Peter J. Mendygral, Jonathan D. Slavin, Bradley Spitzbart, Wayne L. Waldron
X-Atlas: An Online Archive of Chandra's Stellar High Energy Transmission Gratings Observations
null
null
10.1086/527477
null
astro-ph
null
The high-resolution X-ray spectroscopy made possible by the 1999 deployment of the Chandra X-ray Observatory has revolutionized our understanding of stellar X-ray emission. Many puzzles remain, though, particularly regarding the mechanisms of X-ray emission from OB stars. Although numerous individual stars have been observed in high-resolution, realizing the full scientific potential of these observations will necessitate studying the high-resolution Chandra dataset as a whole. To facilitate the rapid comparison and characterization of stellar spectra, we have compiled a uniformly processed database of all stars observed with the Chandra High Energy Transmission Grating (HETG). This database, known as X-Atlas, is accessible through a web interface with searching, data retrieval, and interactive plotting capabilities. For each target, X-Atlas also features predictions of the low-resolution ACIS spectra convolved from the HETG data for comparison with stellar sources in archival ACIS images. Preliminary analyses of the hardness ratios, quantiles, and spectral fits derived from the predicted ACIS spectra reveal systematic differences between the high-mass and low-mass stars in the atlas and offer evidence for at least two distinct classes of high-mass stars. A high degree of X-ray variability is also seen in both high and low-mass stars, including Capella, long thought to exhibit minimal variability. X-Atlas contains over 130 observations of approximately 25 high-mass stars and 40 low-mass stars and will be updated as additional stellar HETG observations become public. The atlas has recently expanded to non-stellar point sources, and Low Energy Transmission Grating (LETG) observations are currently being added as well.
[ { "version": "v1", "created": "Tue, 4 Dec 2007 23:16:56 GMT" } ]
2009-11-13T00:00:00
[ [ "Westbrook", "Owen W.", "" ], [ "Evans", "Nancy Remage", "" ], [ "Wolk", "Scott J.", "" ], [ "Kashyap", "Vinay L.", "" ], [ "Nichols", "Joy S.", "" ], [ "Mendygral", "Peter J.", "" ], [ "Slavin", "Jonathan D.", "" ], [ "Spitzbart", "Bradley", "" ], [ "Waldron", "Wayne L.", "" ] ]
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712.0611
Alberto Iglesias
Jose J. Blanco-Pillado, Roberto Emparan and Alberto Iglesias
Fundamental Plasmid Strings and Black Rings
27 pages, 2 figures, references added, JHEP version
JHEP0801:014,2008
10.1088/1126-6708/2008/01/014
null
hep-th
null
We construct excited states of fundamental strings that admit a semiclassical description as rotating circular loops of string. We identify them with the supergravity solutions for rotating dipole rings. The identification involves a precise match of the mass, radius and angular momentum of the two systems. Moreover, the degeneracy of the string state reproduces the parametric dependence of the entropy in the supergravity description. When the solutions possess two macroscopic angular momenta, they are better described as toroidal configurations (tubular loops) instead of loops of string. We argue that the decay of the string state can be interpreted as superradiant emission of quanta from the ergoregion of the rotating ring.
[ { "version": "v1", "created": "Wed, 5 Dec 2007 19:07:34 GMT" }, { "version": "v2", "created": "Wed, 19 Dec 2007 20:24:48 GMT" }, { "version": "v3", "created": "Wed, 9 Jan 2008 20:22:26 GMT" } ]
2008-11-26T00:00:00
[ [ "Blanco-Pillado", "Jose J.", "" ], [ "Emparan", "Roberto", "" ], [ "Iglesias", "Alberto", "" ] ]
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712.0612
Christopher Thom
C. Thom, J.E.G. Peek, M.E. Putman, Carl Heiles, K.M.G. Peek, R. Wilhelm
An Accurate Distance to High-Velocity Cloud Complex C
Resubmitted to ApJ. 8 figures
null
10.1086/589960
null
astro-ph
null
We report an accurate distance of d = 10+/-2.5kpc to the high-velocity cloud Complex C. Using high signal-to-noise Keck/HIRES spectra of two horizontal-branch stars, we have detected CaII K absorption lines from the cloud. Significant non-detections toward a further 3 stars yield robust lower distance limits. The resulting HI mass of Complex C is 4.9^{+2.8}_{-2.2} x 10^6 Msun; a total mass of 8.2^{+4.6}_{-2.6} x 10^6 Msun is implied, after corrections for helium and ionization. At 10kpc, Complex C has physical dimensions 3x15 kpc, and if it is as thick as it is wide, then the average density is log<n> ~ -2.5. We estimate the contribution of Complex C to the mass influx may be as high as ~0.14 Msun/yr.
[ { "version": "v1", "created": "Tue, 4 Dec 2007 21:13:23 GMT" }, { "version": "v2", "created": "Wed, 23 Apr 2008 00:05:12 GMT" } ]
2009-11-13T00:00:00
[ [ "Thom", "C.", "" ], [ "Peek", "J. E. G.", "" ], [ "Putman", "M. E.", "" ], [ "Heiles", "Carl", "" ], [ "Peek", "K. M. G.", "" ], [ "Wilhelm", "R.", "" ] ]
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712.0613
Michael Plank
A. James and M. J. Plank
On fitting power laws to ecological data
null
null
null
null
q-bio.QM
null
Heavy-tailed or power-law distributions are becoming increasingly common in biological literature. A wide range of biological data has been fitted to distributions with heavy tails. Many of these studies use simple fitting methods to find the parameters in the distribution, which can give highly misleading results. The potential pitfalls that can occur when using these methods are pointed out, and a step-by-step guide to fitting power-law distributions and assessing their goodness-of-fit is offered.
[ { "version": "v1", "created": "Tue, 4 Dec 2007 21:09:59 GMT" } ]
2007-12-06T00:00:00
[ [ "James", "A.", "" ], [ "Plank", "M. J.", "" ] ]
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712.0614
Petja Salmi
Mark Hindmarsh and Petja Salmi
Oscillons and Domain Walls
11 pages, 28 eps figures
Phys.Rev.D77:105025,2008
10.1103/PhysRevD.77.105025
null
hep-th hep-ph nlin.PS
null
Oscillons, extremely long-lived localized oscillations of a scalar field, are shown to be produced by evolving domain wall networks in quartic theory in two spatial dimensions. We study the oscillons in frequency space using the classical spectral function at zero momentum, and obtain approximate information of their velocity distribution. In order to gain some insight onto the dilute oscillon 'gas' produced by the domain walls, we prepare a denser gas by filling the simulation volume with oscillons boosted in random directions. We finish the study by revisiting collisions between oscillons and between an oscillon and a domain wall, showing that in the latter case they can pass straight through with minimal distortion.
[ { "version": "v1", "created": "Wed, 5 Dec 2007 18:39:39 GMT" } ]
2008-11-26T00:00:00
[ [ "Hindmarsh", "Mark", "" ], [ "Salmi", "Petja", "" ] ]
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712.0615
Christopher Pope
M.J. Perry, H. Lu and C.N. Pope
Infinite-Dimensional Symmetries of Two-Dimensional Coset Models Coupled to Gravity
27 pages
Nucl.Phys.B806:656-683,2009
10.1016/j.nuclphysb.2008.07.035
DAMTP-2007-115 MIFP-07-31
hep-th
null
In an earlier paper we studied the infinite-dimensional symmetries of symmetric-space sigma models (SSMs) in a flat two-dimensional spacetime. Here, we extend our investigation to the case of two-dimensional SSMs coupled to gravity. These theories arise from the toroidal reduction of higher-dimensional gravity and supergravities to two dimensions. We construct explicit expressions for the symmetry transformations under the affine Kac-Moody extension $\hat G$ that arises when starting from a G/H coset model. We also construct further explicit symmetry transformations that correspond to the modes L_n of a Virasoro subalgebra with $n\ge -1$.
[ { "version": "v1", "created": "Tue, 4 Dec 2007 21:20:27 GMT" } ]
2008-11-26T00:00:00
[ [ "Perry", "M. J.", "" ], [ "Lu", "H.", "" ], [ "Pope", "C. N.", "" ] ]
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712.0616
Jinshan Zhang
Jinshan Zhang
Upper Bounds for the Number of Hamiltonian Cycles
8 pages
null
null
null
cs.DM
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
An upper bound for the number of Hamiltonian cycles of symmetric diagraphs is established first in this paper, which is tighter than the famous Minc's bound and the Br$\acute{e}$gman's bound. A transformation on graphs is proposed, so that counting the number of Hamiltonian cycles of an undirected graph can be done by counting the number of Hamiltonian cycles of its corresponding symmetric directed graph. In this way, an upper bound for the number of Hamiltonian cycles of undirected graphs is also obtained.
[ { "version": "v1", "created": "Tue, 4 Dec 2007 21:16:11 GMT" }, { "version": "v2", "created": "Sun, 20 Jan 2008 19:29:44 GMT" }, { "version": "v3", "created": "Tue, 22 Jan 2008 11:17:29 GMT" }, { "version": "v4", "created": "Fri, 25 Jan 2008 05:37:57 GMT" }, { "version": "v5", "created": "Sat, 6 Dec 2008 02:23:55 GMT" } ]
2008-12-06T00:00:00
[ [ "Zhang", "Jinshan", "" ] ]
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712.0617
Francois Metayer
Yves Lafont, Francois Metayer and Krzysztof Worytkiewicz
A folk model structure on omega-cat
33 pages, expanded version of the original 17 pages synopsis, new sections added
null
null
null
math.CT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We establish a model structure on the category of strict omega-categories. The constructions leading to the model structure in question are expressed entirely within the scope of omega-categories, building on a set of generating cofibrations and a class of weak equivalences as basic items. All object are fibrant while cofibrant objects are exactly the free ones. Our model structure transfers to n-categories along right-adjoints, for each n, thus recovering the known cases n = 1 and n = 2.
[ { "version": "v1", "created": "Tue, 4 Dec 2007 21:45:09 GMT" }, { "version": "v2", "created": "Wed, 17 Jun 2009 08:20:47 GMT" } ]
2009-06-17T00:00:00
[ [ "Lafont", "Yves", "" ], [ "Metayer", "Francois", "" ], [ "Worytkiewicz", "Krzysztof", "" ] ]
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712.0618
Chelsea MacLeod
Chelsea L. MacLeod, Craig J. Hogan
Precision of Hubble constant derived using black hole binary absolute distances and statistical redshift information
9 pages, 4 figures, submitted to Phys. Rev. D; new references added
Phys.Rev.D77:043512,2008
10.1103/PhysRevD.77.043512
null
astro-ph
null
Measured gravitational waveforms from black hole binary inspiral events directly determine absolute luminosity distances. To use these data for cosmology, it is necessary to independently obtain redshifts for the events, which may be difficult for those without electromagnetic counterparts. Here it is demonstrated that certainly in principle, and possibly in practice, clustering of galaxies allows extraction of the redshift information from a sample statistically for the purpose of estimating mean cosmological parameters, without identification of host galaxies for individual events. We extract mock galaxy samples from the 6th Data Release of the Sloan Digital Sky Survey resembling those that would be associated with inspiral events of stellar mass black holes falling into massive black holes at redshift z ~ 0.1 to 0.5. A simple statistical procedure is described to estimate a likelihood function for the Hubble constant H_0: each galaxy in a LISA error volume contributes linearly to the log likelihood for the source redshift, and the log likelihood for each source contributes linearly to that of H_0. This procedure is shown to provide an accurate and unbiased estimator of H_0. It is estimated that a precision better than one percent in H_0 may be possible if the rate of such events is sufficiently high, on the order of 20 to z = 0.5.
[ { "version": "v1", "created": "Tue, 4 Dec 2007 21:46:01 GMT" }, { "version": "v2", "created": "Thu, 6 Dec 2007 21:28:11 GMT" }, { "version": "v3", "created": "Fri, 4 Jan 2008 23:43:03 GMT" } ]
2008-11-26T00:00:00
[ [ "MacLeod", "Chelsea L.", "" ], [ "Hogan", "Craig J.", "" ] ]
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712.0619
Yu Nakayama
Yu Nakayama
Stable SUSY Breaking Model with O(10) eV Gravitino from Combined D-term Gauge Mediation and U(1)' Mediation
14 pages, v2: refereces added
JHEP0802:013,2008
10.1088/1126-6708/2008/02/013
UCB-PTH-07/23
hep-ph hep-th
null
We show a calculable example of stable supersymmetry (SUSY) breaking models with O(10) eV gravitino mass based on the combination of D-term gauge mediation and U(1)' mediation. A potential problem of the negative mass squared for the SUSY standard model (SSM) sfermions in the D-term gauge mediation is solved by the contribution from the U(1)' mediation. On the other hand, the splitting between the SSM gauginos and sfermions in the U(1)' mediation is circumvented by the contributions from the D-term gauge mediation. Since the U(1)' mediation does not introduce any new SUSY vacua, we achieve a completely stable model under thermal effects. Our model, therefore, has no cosmological difficulty.
[ { "version": "v1", "created": "Tue, 4 Dec 2007 22:04:18 GMT" }, { "version": "v2", "created": "Fri, 4 Jan 2008 17:15:39 GMT" } ]
2008-11-26T00:00:00
[ [ "Nakayama", "Yu", "" ] ]
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712.062
Alexander K. Motovilov
Alexander K. Motovilov
Progress in methods to solve the Faddeev and Yakubovsky differential equations
A review article based on a talk given at the 20th European Conference on Few-Body Problems in Physics
Few-Body Systems 43 (2008), 121-127
10.1007/s00601-008-0219-5
null
quant-ph math-ph math.MP nucl-th
null
We shortly recall the derivation of the Faddeev-Yakubovsky differential equations and point out their main advantages. Then we give a review of the numerical approaches used to solve the bound-state and scattering problems for the three- and four-body systems based on these equations. A particular attention is payed to the latest developments.
[ { "version": "v1", "created": "Tue, 4 Dec 2007 21:52:19 GMT" } ]
2009-04-03T00:00:00
[ [ "Motovilov", "Alexander K.", "" ] ]
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712.0621
Jean-Rene Cudell
O. V. Selyugin, J.-R. Cudell, E. Predazzi
Analytic properties of different unitarization schemes
Presented at the Advanced Studies Institute "SYMMETRIES AND SPIN", Prague, Czech Republic, July 8 - July 14, 2007. In version 2 figures are updated, a few typos are fixed, and a brief discussion on the real part is included
Eur.Phys.J.ST162:37-42,2008
10.1140/epjst/e2008-00773-0
null
hep-ph
null
The analytic properties of the eikonal and U-matrix unitarization schemes are examined. It is shown that the basic properties of these schemes are identical. Both can fill the full circle of unitarity, and both can lead to standard and non-standard asymptotic relations for the ratio of the elastic cross section to the total cross section. The relation between the phases of the unitarized amplitudes in each scheme is examined, and it is shown that demanding equivalence of the two schemes leads to a bound on the phase in the U-matrix scheme.
[ { "version": "v1", "created": "Tue, 4 Dec 2007 21:56:57 GMT" }, { "version": "v2", "created": "Mon, 7 Jan 2008 13:57:59 GMT" } ]
2008-12-18T00:00:00
[ [ "Selyugin", "O. V.", "" ], [ "Cudell", "J. -R.", "" ], [ "Predazzi", "E.", "" ] ]
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712.0622
Ashkan Nikeghbali
Delia Coculescu and Ashkan Nikeghbali
Filtrations
Short article on filtrations for the encyclopaedia of quantitative finance, Wiley
null
null
null
math.PR
null
In this article, we define the notion of a filtration and then give the basic theorems on initial and progressive enlargements of filtrations.
[ { "version": "v1", "created": "Tue, 4 Dec 2007 21:57:21 GMT" } ]
2007-12-06T00:00:00
[ [ "Coculescu", "Delia", "" ], [ "Nikeghbali", "Ashkan", "" ] ]
[ 0.0367600806, -0.0790611058, 0.01927788, -0.0331687257, 0.0398896895, 0.0666965842, 0.0222792253, 0.064541772, -0.0957352594, 0.0802411288, 0.1048675552, -0.0533572696, -0.1119476557, -0.0266786348, 0.1301096529, 0.0470467471, -0.0083242469, -0.0351439714, 0.079112418, 0.1084589139, 0.1660231948, -0.0025844928, 0.0745462626, -0.0058519845, -0.0431219079, -0.165304929, 0.0528442189, 0.0490732975, -0.0279099569, -0.0253831819, 0.0382992327, -0.0216892175, -0.0793176368, 0.0212659501, -0.0663374513, 0.0531007461, 0.0110370023, 0.1071249843, -0.0779836997, 0.1539151967, 0.0084653357, 0.0582825579, -0.084755972, 0.0115692932, 0.093529135, 0.0014365419, 0.0162380543, 0.0118899494, -0.0197396241, 0.0398640372, -0.0812159255, 0.0478419773, 0.0115436399, -0.0372987837, 0.0235618521, 0.0558199137, -0.0997883603, 0.018123515, -0.0792663321, -0.0832681283, 0.0107035199, -0.1028666571, 0.0938369706, -0.0452767238, -0.1156416237, 0.0420445018, -0.1189251468, 0.0983005092, 0.0988648683, 0.0610017255, -0.022099657, 0.0017171165, 0.0195344053, -0.0126531124, 0.0403514355, -0.0339126512, 0.0559225231, 0.0279869139, 0.0080484822, 0.0206887685, 0.0412236229, -0.0264990684, 0.0433784351, 0.0989674777, 0.0733662471, -0.0495350435, -0.0426601656, 0.0714679584, -0.0800359026, -0.140370667, -0.0353235379, -0.0300647691, -0.0692105368, 0.1028666571, 0.0334509052, 0.0391457677, 0.1294939965, 0.1015840322, -0.0767010748, 0.0204065908, 0.0130892051, -0.0352978855, 0.025165135, -0.0332969874, 0.0898864791, -0.0071827094, -0.0272942968, -0.0436606109, 0.0377605297, -0.001165587, 0.0320656672, -0.1501186341, 0.1207721308, -0.0505867973, 0.0325530656, 0.0434553921, -0.1581222117, 0.0500737466, -0.0761367232, -0.0037741291, -0.0132238809, -0.0943500176, -0.0277816933, 0.0259347111, 0.0525876954, -0.1091771871, 0.0098826382, -0.0084460964, -0.0720836222, -0.0346822254, 0.123850435, -0.1009170711, 0.082908988, -0.0422240719, -0.0237285942, -0.0513820238, 0.0129032247, -0.0270634238, 0.0446867123, -0.0722375363, 0.0266273301, -0.0148015125, 0.0479445867, 0.0741871297, -0.0454562902, -0.045584552, -0.0563329645, 0.0229974966, 0.0517411605, -0.0849611908, -0.0439171381, 0.0072276015, 0.0754697546, -0.0455588996, -0.0807541758, -0.0719297081, 0.0045661512, 0.126210466, 0.0528955236, 0.0033701016, -0.0242929496, 0.1030205786, -0.0862951204, -0.0919386819, -0.0225870553, 0.047431536, 0.0319630578, -0.0242672972, -0.007073686, -0.017212851, -0.0387866311, 0.020034628, -0.0516642034, 0.0418905877, 0.0260373224, 0.0141217196, -0.08383248, -0.1049188599, -0.0075931498, -0.1129737571, 0.0275251679, 0.077008903, 0.0427884273, 0.019123964, -0.0614121668, 0.0851151049, 0.0352209285, 0.0498685241, 0.0141217196, -0.0739819109, -0.040992748, 0.0392740294, -0.055306863, -0.0247162171, -0.0272173379, 0.0114923352, 0.015455652, 0.0330917686, 0.012544089, -0.0153402155, 0.0353235379, 0.0176874213, 0.0147502068, 0.1436541826, 0.0456871614, -0.0455075949, 0.029526066, 0.0591034368, -0.0130827921, -0.0660296232, 0.0541781522, 0.0111267865, 0.0304752104, -0.0374270454, -0.0359135456, 0.0933752209, -0.0554607771, -0.0108895004, -0.0084204441, 0.0894760415, -0.0020057075, -0.0804463476, 0.0711088255, 0.0346822254, 0.0201757178, 0.0574103706, -0.0186493918, -0.007112165, -0.0772141293, -0.0907073617, 0.0038799457, -0.0748540908, -0.0909638852, -0.0091836071, -0.0399922989, -0.0404540449, -0.0527416095, -0.0823446363, 0.0194830988, -0.0492272116, -0.0591034368, 0.035426151, -0.1090745702, 0.0345283113, -0.0734175518, 0.0479958914, -0.0523824729, 0.0677226856, 0.0367087759, 0.0683383495, 0.0118258176, 0.0544859804, 0.0585390814, -0.0354774557, 0.0533059649, -0.0732636377 ]
712.0623
Victor A. Gopar
Victor A. Gopar and Diego Frustaglia
Statistics of orbital entanglement production in quantum-chaotic dots
Added a reference and minor changes
Phys. Rev. B 77, 153403 (2008)
10.1103/PhysRevB.77.153403
null
cond-mat.mes-hall quant-ph
null
The production of orbitally entangled electrons in quantum-chaotic dots is investigated from a statistical point of view. The degree of entanglement is quantified through the concurrence and the entanglement of formation. We calculate the complete statistical distributions of the entanglement measures by using random matrix theory. Simple analytical expressions are provided for the concurrence distributions. We identify clear signatures of time-reversal invariance in the production of entanglement at the level of the entanglement-measure distributions, such as the ability of producing maximally entangled (Bell) states, which passed unnoticed in previous works where only the first two moments of the distributions were studied.
[ { "version": "v1", "created": "Tue, 4 Dec 2007 21:58:27 GMT" }, { "version": "v2", "created": "Wed, 16 Apr 2008 18:57:09 GMT" } ]
2008-04-16T00:00:00
[ [ "Gopar", "Victor A.", "" ], [ "Frustaglia", "Diego", "" ] ]
[ 0.0145352883, -0.0332723744, -0.0057255602, 0.0461709164, 0.0223892312, 0.0822770596, 0.0475878008, 0.0350801237, -0.0919509679, -0.0028856823, 0.0929281339, 0.0613657907, -0.0116831968, 0.0687922239, 0.0892637745, 0.0573105663, -0.060632918, 0.021717431, 0.0418714024, 0.0677173436, -0.0780752674, -0.0771469623, 0.0534996353, 0.0231587458, -0.0790524259, -0.0260413736, 0.1278128177, 0.0092708273, 0.0442165919, -0.0053499634, -0.0109747536, -0.0137657737, 0.0548676625, -0.078661561, -0.05071472, 0.1991456747, 0.0064675929, 0.0059393146, -0.0842313841, 0.0251619276, -0.0361061469, -0.002314653, -0.0069195302, 0.0949313119, 0.0285087097, -0.1151097119, 0.015048299, -0.0950290337, 0.0847199708, -0.0632712543, -0.0614146478, 0.0517896004, 0.1051426604, -0.0954687521, -0.0924884081, -0.0672287643, -0.0219128635, 0.0781241208, 0.0370100215, -0.0857459903, 0.0948824584, -0.0748506263, 0.1225361452, 0.1753029078, -0.0759743676, -0.0351045541, -0.027507117, 0.0379383266, 0.0831076503, 0.1004522815, -0.0343472548, 0.0385734811, 0.0340785347, 0.0142177111, 0.0399903655, 0.0089288205, -0.0385979079, -0.0468793586, 0.0008908972, 0.0660073087, 0.0413095355, -0.0249909256, 0.1146211326, 0.0277025495, -0.0177354943, -0.0068401359, 0.0109075736, -0.1029928997, -0.0655187294, -0.0073470389, 0.0232320335, 0.033565525, -0.0558448248, -0.0263100937, 0.0762675181, -0.0671310499, 0.0847199708, -0.0048522213, -0.0640529841, -0.0272383988, -0.064101845, 0.0233053192, -0.0004767483, -0.0323684998, 0.0874071643, -0.044094447, -0.0709908381, -0.048564963, -0.0085135261, -0.0282888468, 0.1240996048, -0.0798341557, -0.0790035725, 0.0486382507, 0.0212654937, -0.1220475659, -0.0693785176, -0.0485405363, 0.0093318997, 0.0351045541, -0.110419333, -0.1057289541, 0.0035025161, 0.1048495099, 0.074020043, -0.0035666423, -0.0313424803, -0.1332849264, 0.0717725679, 0.038207043, 0.0540370718, 0.0243801977, -0.0227556657, -0.084622249, -0.1343598068, -0.0655675903, 0.0366924442, 0.0362527184, -0.0112740099, -0.0160987489, 0.0349824093, -0.0493222661, 0.0671799034, 0.0984490961, -0.0019329491, 0.0471969359, -0.0073103951, 0.0459999144, 0.0907783732, -0.046415206, -0.0790035725, -0.0595091805, 0.0276536923, 0.011799234, 0.1485286653, -0.0676684901, -0.0474900864, 0.0607794933, -0.0029864521, -0.0299744532, 0.0462686345, 0.0109014669, -0.0389887728, -0.1007454321, 0.1344575286, 0.0381093286, -0.050372716, 0.0699648187, -0.0460243411, -0.0250642113, 0.0910226628, -0.0651278645, -0.0118358778, -0.0787104219, 0.0918043926, 0.0242458396, -0.0798830166, -0.0331502296, -0.0337120965, -0.0441433042, 0.047954239, -0.0212899223, -0.0076707238, -0.1010385752, -0.0141932815, 0.0467083566, 0.0267253872, 0.0057133455, 0.0480519533, 0.0298523065, -0.0275804047, 0.0320997797, 0.0668867603, 0.0538905002, 0.051203303, -0.0970810726, 0.0626849607, 0.0497864187, -0.0256016515, -0.0847199708, -0.0286797117, -0.0012474087, -0.0030689002, -0.0798341557, -0.0299500227, -0.0276048332, 0.1488218158, -0.152046442, -0.0604863428, 0.0480763838, 0.0649812892, -0.0248443503, -0.0038078793, 0.0264810976, -0.0632712543, -0.027287256, -0.1155005768, 0.0747040585, -0.0420179777, 0.0318554901, -0.025137499, 0.0953221768, -0.0106632831, 0.1123736575, 0.0185782984, 0.052864477, 0.0325150751, -0.0208502002, 0.1107124835, -0.0121168122, -0.0645415708, 0.0100403419, 0.0058568665, -0.0228411686, -0.0258703716, 0.0224380884, -0.0098632313, -0.0166850463, -0.0348602645, 0.0192745253, -0.044485312, -0.0168438349, 0.0523758978, 0.0406988077, 0.0208746288, 0.0123855313, -0.0684502199, 0.1144257039, -0.0783684105, -0.0720657185, -0.040845383, 0.0659584552, -0.0525713302, -0.0018016429, -0.0036155004, -0.0145963617 ]
712.0624
Fernando Delgado Acosta
F. Delgado (Quantum Theory Group, Institute for Microstructural Sciences, National Research Council, Ottawa, Ontario, Canada) P. Hawrylak (Quantum Theory Group, Institute for Microstructural Sciences, National Research Council, Ottawa, Ontario, Canada)
Theory of electronic transport through a triple quantum dot in the presence of magnetic field
null
J. Phys.: Condens. Matter 20, 315207 (2008)
10.1088/0953-8984/20/31/315207
null
cond-mat.str-el cond-mat.mes-hall
null
Theory of electronic transport through a triangular triple quantum dot subject to a perpendicular magnetic field is developed using a tight binding model. We show that magnetic field allows to engineer degeneracies in the triple quantum dot energy spectrum. The degeneracies lead to zero electronic transmission and sharp dips in the current whenever a pair of degenerate states lies between the chemical potential of the two leads. These dips can occur with a periodicity of one flux quantum if only two levels contribute to the current or with half flux quantum if the three levels of the triple dot contribute. The effect of strong bias voltage and different lead-to-dot connections on Aharonov-Bohm oscillations in the conductance is also discussed.
[ { "version": "v1", "created": "Wed, 5 Dec 2007 14:29:07 GMT" } ]
2010-03-11T00:00:00
[ [ "Delgado", "F.", "", "Quantum Theory Group, Institute for Microstructural\n Sciences, National Research Council, Ottawa, Ontario, Canada" ], [ "Hawrylak", "P.", "", "Quantum Theory Group, Institute for Microstructural Sciences, National\n Research Council, Ottawa, Ontario, Canada" ] ]
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712.0625
Franklin Marquezino
F.L. Marquezino, R. Portugal, G. Abal and R. Donangelo
Mixing Times in Quantum Walks on the Hypercube
REVTeX, 9 pages, with small corrections
Phys. Rev. A 77, 042312 (2008)
10.1103/PhysRevA.77.042312
null
quant-ph
null
The mixing time of a discrete-time quantum walk on the hypercube is considered. The mean probability distribution of a Markov chain on a hypercube is known to mix to a uniform distribution in time O(n log n). We show that the mean probability distribution of a discrete-time quantum walk on a hypercube mixes to a (generally non-uniform) distribution pi(x) in time O(n) and the stationary distribution is determined by the initial state of the walk. An explicit expression for pi(x) is derived for the particular case of a symmetric walk. These results are consistent with those obtained previously for a continuous-time quantum walk. The effect of decoherence due to randomly breaking links between connected sites in the hypercube is also considered. We find that the probability distribution mixes to the uniform distribution as expected. However, the mixing time has a minimum at a critical decoherence rate $p \approx 0.1$. A similar effect was previously reported for the QW on the N-cycle with decoherence from repeated measurements of position. A controlled amount of decoherence helps to obtain--and preserve--a uniform distribution over the $2^n$ sites of the hypercube in the shortest possible time.
[ { "version": "v1", "created": "Tue, 4 Dec 2007 22:24:50 GMT" }, { "version": "v2", "created": "Wed, 19 Dec 2007 17:34:26 GMT" } ]
2008-04-17T00:00:00
[ [ "Marquezino", "F. L.", "" ], [ "Portugal", "R.", "" ], [ "Abal", "G.", "" ], [ "Donangelo", "R.", "" ] ]
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712.0626
Henrik Aratyn
H. Aratyn, J.F. Gomes, L.H. Ymai and A.H. Zimerman
A Class of Soliton Solutions for the N=2 Super mKdV/Sinh-Gordon Hierarchy
8 pages
J.Phys.A41:312001,2008
10.1088/1751-8113/41/31/312001
null
nlin.SI hep-th math-ph math.MP
null
Employing the Hirota's method, a class of soliton solutions for the N=2 super mKdV equations is proposed in terms of a single Grassmann parameter. Such solutions are shown to satisfy two copies of N=1 supersymmetric mKdV equations connected by nontrivial algebraic identities. Using the super Miura transformation, we obtain solutions of the N=2 super KdV equations. These are shown to generalize solutions derived previously. By using the mKdV/sinh-Gordon hierarchy properties we generate the solutions of the N=2 super sinh-Gordon as well.
[ { "version": "v1", "created": "Tue, 4 Dec 2007 22:27:56 GMT" } ]
2008-11-26T00:00:00
[ [ "Aratyn", "H.", "" ], [ "Gomes", "J. F.", "" ], [ "Ymai", "L. H.", "" ], [ "Zimerman", "A. H.", "" ] ]
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712.0627
Michael Kiermaier
Michael Kiermaier, Ashoke Sen, Barton Zwiebach
Linear b-Gauges for Open String Fields
LaTeX file, 50 pages
JHEP 0803:050,2008
10.1088/1126-6708/2008/03/050
MIT-CTP-3917
hep-th
null
Motivated by Schnabl's gauge choice, we explore open string perturbation theory in gauges where a linear combination of antighost oscillators annihilates the string field. We find that in these linear b-gauges different gauge conditions are needed at different ghost numbers. We derive the full propagator and prove the formal properties which guarantee that the Feynman diagrams reproduce the correct on-shell amplitudes. We find that these properties can fail due to the need to regularize the propagator, and identify a large class of linear b-gauges for which they hold rigorously. In these gauges the propagator has a non-anomalous Schwinger representation and builds Riemann surfaces by adding strip-like domains. Projector-based gauges, like Schnabl's, are not in this class of gauges but we construct a family of regular linear b-gauges which interpolate between Siegel gauge and Schnabl gauge.
[ { "version": "v1", "created": "Wed, 5 Dec 2007 05:23:58 GMT" } ]
2010-12-09T00:00:00
[ [ "Kiermaier", "Michael", "" ], [ "Sen", "Ashoke", "" ], [ "Zwiebach", "Barton", "" ] ]
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712.0628
Michael P. Tuite
Geoffrey Mason and Michael P. Tuite
The Genus Two Partition Function for Free Bosonic and Lattice Vertex Operator Algebras
85 pages
null
null
null
math.QA hep-th math.NT
null
We define the $n$-point function for a vertex operator algebra on a genus two Riemann surface in two separate sewing schemes where either two tori are sewn together or a handle is sewn to one torus. We explicitly obtain closed formulas for the genus two partition function for the Heisenberg free bosonic string and lattice vertex operator algebras in both sewing schemes. We prove that the partition functions are holomorphic in the sewing parameters on given suitable domains and describe their modular properties. Finally, we show that the partition functions cannot be equal in the neighborhood of a two-tori degeneration point where they can be explicitly compared.
[ { "version": "v1", "created": "Tue, 4 Dec 2007 23:04:04 GMT" } ]
2007-12-06T00:00:00
[ [ "Mason", "Geoffrey", "" ], [ "Tuite", "Michael P.", "" ] ]
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712.0629
Yifan Yang
Yifan Yang
Modular unit and cuspidal divisor class groups of X_1(N)
43 pages
null
null
null
math.NT math.AG
null
In this article, we consider the group $F_1^\infty(N)$ of modular units on $X_1(N)$ that have divisors supported on the cusps lying over $\infty$ of $X_0(N)$, called the $\infty$-cusps. For each positive integer $N$, we will give an explicit basis for the group $F_1^\infty(N)$. This enables us to compute the group structure of the rational torsion subgroup $C_1^\infty(N)$ of the Jacobian $J_1(N)$ of $X_1(N)$ generated by the differences of the $\infty$-cusps. In addition, based on our numerical computation, we make a conjecture on the structure of the $p$-primary part of $C_1^\infty(p^n)$ for a regular prime $p$.
[ { "version": "v1", "created": "Wed, 5 Dec 2007 20:55:32 GMT" } ]
2007-12-06T00:00:00
[ [ "Yang", "Yifan", "" ] ]
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712.063
Ioan Valeriu Grossu
I. V. Grossu, C. Besliu
On The Leptons Masses
null
null
null
null
nucl-th
null
In this paper we present a connection between the results obtained from a semiclassical study of a relativistic, two-body system, and the leptons masses. Some possible consequences are also discussed.
[ { "version": "v1", "created": "Wed, 5 Dec 2007 17:59:13 GMT" }, { "version": "v2", "created": "Tue, 15 Jan 2008 23:15:40 GMT" }, { "version": "v3", "created": "Tue, 22 Jan 2008 09:35:39 GMT" } ]
2008-10-06T00:00:00
[ [ "Grossu", "I. V.", "" ], [ "Besliu", "C.", "" ] ]
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712.0631
Kathrin Bringmann
Kathrin Bringmann and Jeremy Lovejoy
Overpartitions and class numbers of binary quadratic forms
9 pages
null
null
null
math.NT math.CO
null
We show that the Zagier-Eisenstein series shares its non-holomorphic part with certain weak Maass forms whose holomorphic parts are generating functions for overpartition rank differences. This has a number of consequences, including exact formulas, asymptotics, and congruences for the rank differences as well as $q$-series identities of the mock theta type.
[ { "version": "v1", "created": "Tue, 4 Dec 2007 23:01:47 GMT" } ]
2007-12-06T00:00:00
[ [ "Bringmann", "Kathrin", "" ], [ "Lovejoy", "Jeremy", "" ] ]
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712.0632
Aaron Wootton
S. A. Broughton, A. Wootton
Topologically unique maximal elementary Abelian group actions on compact oriented surfaces
26 Pages
null
null
null
math.AT math.AG
null
We determine all finite maximal elementary abelian group actions on compact oriented surfaces of genus $\sigma\geq 2$ which are unique up to topological equivalence. For certain special classes of such actions, we determine group extensions which also define unique actions. In addition, we explore in detail one of the families of such surfaces considered as compact Riemann surfaces and tackle the classical problem of constructing defining equations.
[ { "version": "v1", "created": "Tue, 4 Dec 2007 23:36:04 GMT" } ]
2007-12-06T00:00:00
[ [ "Broughton", "S. A.", "" ], [ "Wootton", "A.", "" ] ]
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712.0633
Craig Roberts
C. D. Roberts
Hadron Properties and Dyson-Schwinger Equations
18 pages, 2 figures. Contribution to the Proceedings of the International School of Nuclear Physics, Erice-Sicily -- 29th Course: Quarks in Hadrons and Nuclei, 16-24 September, 2007
Prog.Part.Nucl.Phys.61:50-65,2008
10.1016/j.ppnp.2007.12.034
null
nucl-th hep-lat hep-ph nucl-ex
null
An overview of the theory and phenomenology of hadrons and QCD is provided from a Dyson-Schwinger equation viewpoint. Following a discussion of the definition and realisation of light-quark confinement, the nonperturbative nature of the running mass in QCD and inferences from the gap equation relating to the radius of convergence for expansions of observables in the current-quark mass are described. Some exact results for pseudoscalar mesons are also highlighted, with details relating to the U_A(1) problem, and calculated masses of the lightest J=0,1 states are discussed. Studies of nucleon properties are recapitulated upon and illustrated: through a comparison of the ln-weighted ratios of Pauli and Dirac form factors for the neutron and proton; and a perspective on the contribution of quark orbital angular momentum to the spin of a nucleon at rest. Comments on prospects for the future of the study of quarks in hadrons and nuclei round out the contribution.
[ { "version": "v1", "created": "Tue, 4 Dec 2007 23:41:29 GMT" }, { "version": "v2", "created": "Thu, 6 Dec 2007 17:51:18 GMT" } ]
2008-11-26T00:00:00
[ [ "Roberts", "C. D.", "" ] ]
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712.0634
Alfred Stadler
Franz Gross and Alfred Stadler
High-precision covariant one-boson-exchange potentials for np scattering below 350 MeV
3 pages, 1 figure. To appear in the proceedings of the 20th European Conference on Few-Body Problems in Physics, Pisa, September 10-14, 2007
Few Body Syst.44:295-298,2008
10.1007/s00601-008-0312-9
JLAB-THY-07-759
nucl-th
null
Using the Covariant Spectator Theory (CST), we have found One-Boson-Exchange (OBE) potentials that fit the 2006 world np data below 350 MeV with a \chi^2/N_data very close to 1, for a total of 3788 data. Our potentials have significantly fewer adjustable parameters than previous high-precision potentials, and they also reproduce the experimental triton binding energy without introducing additional irreducible three-nucleon forces.
[ { "version": "v1", "created": "Wed, 5 Dec 2007 00:06:05 GMT" } ]
2009-01-16T00:00:00
[ [ "Gross", "Franz", "" ], [ "Stadler", "Alfred", "" ] ]
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712.0635
Elena Bratkovskaya
E.L. Bratkovskaya (FIAS, Uni. Frankfurt), W. Cassing (Uni. Giessen)
Dilepton production and off-shell transport dynamics at SIS energies
43 pages, 22 figures; to be published to Nucl. Phys. A
Nucl.Phys.A807:214-250,2008
10.1016/j.nuclphysa.2008.04.004
null
nucl-th
null
Dilepton production in nucleus-nucleus collisions at 1-2 A GeV as well as in elementary pp and pd reactions is studied within the microscopic HSD transport approach which includes the off-shell dynamics of vector mesons explicitly. The study addresses additionally the production of $\pi^0$ and $\eta$ mesons since their Dalitz decays provide a sizeable contribution to the dilepton invariant mass spectra up to about 0.5 GeV. Our transport results agree with the TAPS experimental data on $\pi$ and $\eta$ multiplicities in C+C collisions from 0.8 to 2 A GeV. We find that the 'DLS-puzzle' - which addresses an underestimation of the $e^+e^-$ yield in the mass range from 0.2 to 0.5 GeV in C+C and Ca+Ca collisions - may be solved when incorporating a stronger bremsstrahlung contribution in line with recent OBE calculations. Moreover, the HSD results with 'enhanced' bremsstrahlung cross sections agree very well with the HADES experimental data for the dilepton mass spectra for C+C at 1 and 2 A GeV, especially when including a collisional broadening in the vector-meson spectral functions. Detailed predictions for dilepton spectra from pp and pn/pd reactions at 1.25 GeV, 2.2 GeV and 3.5 GeV are presented which will allow to verify/falsify the larger bremsstrahlung contributions from the experimental side in the near future.
[ { "version": "v1", "created": "Tue, 4 Dec 2007 23:52:09 GMT" }, { "version": "v2", "created": "Tue, 15 Apr 2008 13:28:51 GMT" } ]
2008-11-26T00:00:00
[ [ "Bratkovskaya", "E. L.", "", "FIAS, Uni. Frankfurt" ], [ "Cassing", "W.", "", "Uni. Giessen" ] ]
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712.0636
Boris Andrievsky
Alexander L. Fradkov, Boris Andrievsky, Robin J. Evans
Controlled Synchronization of One Class of Nonlinear Systems under Information Constraints
8 pages, 2 figures
null
10.1063/1.2977459
null
math.OC
null
Output feedback controlled synchronization problems for a class of nonlinear unstable systems under information constraints imposed by limited capacity of the communication channel are analyzed. A binary time-varying coder-decoder scheme is described and a theoretical analysis for multi-dimensional master-slave systems represented in Lurie form (linear part plus nonlinearity depending only on measurable outputs) is provided. An output feedback control law is proposed based on the Passification Theorem. It is shown that the synchronization error exponentially tends to zero for sufficiantly high transmission rate (channel capacity). The results obtained for synchronization problem can be extended to tracking problems in a straightforward manner, if the reference signal is described by an {external} ({exogenious}) state space model. The results are applied to controlled synchronization of two chaotic Chua systems via a communication channel with limited capacity.
[ { "version": "v1", "created": "Wed, 5 Dec 2007 00:40:57 GMT" } ]
2009-11-13T00:00:00
[ [ "Fradkov", "Alexander L.", "" ], [ "Andrievsky", "Boris", "" ], [ "Evans", "Robin J.", "" ] ]
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712.0637
Andrew Becker
Andrew C. Becker, Nicole M. Silvestri, Russell E. Owen, Zeljko Ivezic, Robert H. Lupton
In Pursuit of LSST Science Requirements: A Comparison of Photometry Algorithms
Accepted for publication in PASP. Appendix is included only here in this eprint. 11 figures, 18 tables
Publ.Astron.Soc.Pac.119:1462-1482,2007
10.1086/524710
null
astro-ph
null
We have developed an end-to-end photometric data processing pipeline to compare current photometric algorithms commonly used on ground-based imaging data. This testbed is exceedingly adaptable, and enables us to perform many research and development tasks, including image subtraction and co-addition, object detection and measurements, the production of photometric catalogs, and the creation and stocking of database tables with time-series information. This testing has been undertaken to evaluate existing photometry algorithms for consideration by a next-generation image processing pipeline for the Large Synoptic Survey Telescope (LSST). We outline the results of our tests for four packages: The Sloan Digital Sky Survey's (SDSS) Photo package, Daophot and Allframe, DoPhot, and two versions of Source Extractor (SExtractor). The ability of these algorithms to perform point-source photometry, astrometry, shape measurements, star-galaxy separation, and to measure objects at low signal-to-noise is quantified. We also perform a detailed crowded field comparison of Daophot and Allframe, and profile the speed and memory requirements in detail for SExtractor. We find that both Daophot and Photo are able to perform aperture photometry to high enough precision to meet LSST's science requirements, and less adequately at PSF-fitting photometry. Photo performs the best at simultaneous point and extended-source shape and brightness measurements. SExtractor is the fastest algorithm, and recent upgrades in the software yield high-quality centroid and shape measurements with little bias towards faint magnitudes. Allframe yields the best photometric results in crowded fields.
[ { "version": "v1", "created": "Wed, 5 Dec 2007 00:38:03 GMT" } ]
2009-02-02T00:00:00
[ [ "Becker", "Andrew C.", "" ], [ "Silvestri", "Nicole M.", "" ], [ "Owen", "Russell E.", "" ], [ "Ivezic", "Zeljko", "" ], [ "Lupton", "Robert H.", "" ] ]
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712.0638
Andrea Morello
Andrea Morello
Quantum nanomagnets and nuclear spins: an overview
14 pages, 3 figures. Chapter in the Proceedings of the 2006 Les Houches summer school "Quantum Magnetism", ed. B. Barbara & Y. Imry, Springer (2007)
null
10.1007/978-1-4020-8512-3_9
null
cond-mat.mes-hall
null
This mini-review presents a simple and accessible summary on the fascinating physics of quantum nanomagnets coupled to a nuclear spin bath. These chemically synthesized systems are an ideal test ground for the theories of decoherence in mesoscopic quantum degrees of freedom, when the coupling to the environment is local and not small. We shall focus here on the most striking quantum phenomenon that occurs in such nanomagnets, namely the tunneling of their giant spin through a high anisotropy barrier. It will be shown that perturbative treatments must be discarded, and replaced by a more sophisticated formalism where the dynamics of the nanomagnet and the nuclei that couple to it are treated together from the beginning. After a critical review of the theoretical predictions and their experimental verification, we continue with a set of experimental results that challenge our present understanding, and outline the importance of filling also this last gap in the theory.
[ { "version": "v1", "created": "Wed, 5 Dec 2007 00:51:59 GMT" } ]
2015-05-13T00:00:00
[ [ "Morello", "Andrea", "" ] ]
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712.0639
Robert Singleton Jr. Dr.
Robert L. Singleton Jr
BPS Explained II: Calculating the Equilibration Rate in the Extreme Quantum Limit
37 pages, 8 figures
null
null
LA-UR-06-2173
physics.plasm-ph
null
This is the second in a series of two lectures on the technique of dimensional continuation, a new method for analytically calculating certain energy transport quantities in a weakly to moderately coupled plasma. Recently, this method was employed by Brown, Preston, and Singleton (BPS) to calculate the electron-ion temperature equilibration rate and the charged particle stopping power to leading and next-to-leading order in the plasma coupling. In this lecture, I develop the framework further, and then explicitly calculate the electron-ion temperature equilibration rate in the high temperature limit. This method captures all short and long distance physics to second order in the plasma coupling. This analytic perturbative technique is applicable for ignition in inertial confinement fusion and for other processes in hot a weakly coupled plasma.
[ { "version": "v1", "created": "Wed, 5 Dec 2007 00:55:03 GMT" } ]
2007-12-06T00:00:00
[ [ "Singleton", "Robert L.", "Jr" ] ]
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712.064
Rafael Garcia
R. Garcia, K. Osborne, E. Subashi
Validity of the "sharp-kink approximation" for water and other fluids
5 figures
null
null
null
cond-mat.soft
null
The contact angle of a liquid droplet on a solid surface is a direct measure of fundamental atomic-scale forces acting between liquid molecules and the solid surface. In this work, the validity is assessed of a simple equation, which approximately relates the contact angle of a liquid on a surface to its density, its surface tension, and the effective molecule-surface potential. This equation is derived in the sharp-kink approximation, where the density profile of the liquid is assumed to drop precipitously within one molecular diameter of the substrate. It is found that this equation satisfactorily reproduces the temperature-dependence of the contact angle for helium on alkali metal surfaces. The equation also seems be applicable to liquids such as water on solid surfaces such as gold and graphite, based on a comparison of predicted and measured contact angles near room-temperature. Nevertheless, we conclude that, to fully test the equation's applicability to fluids such as water, it remains necessary to measure the contact angle's temperature-dependence. We hypothesize that the effects of electrostatic forces can increase with temperature, potentially driving the wetting temperature much higher and closer to the critical point, or lower, closer to room temperature, than predicted using current theories.
[ { "version": "v1", "created": "Wed, 5 Dec 2007 00:59:03 GMT" }, { "version": "v2", "created": "Mon, 31 Dec 2007 18:19:53 GMT" }, { "version": "v3", "created": "Tue, 18 Mar 2008 20:32:32 GMT" } ]
2008-03-18T00:00:00
[ [ "Garcia", "R.", "" ], [ "Osborne", "K.", "" ], [ "Subashi", "E.", "" ] ]
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712.0641
Grenville Croll
Grenville J. Croll
The Natural Philosophy of Kazuo Kondo
23 pages, 8 Colour & B&W Figures. Revised to include new biographic materials. Includes reference to extensive external supplementary materials
Proc. ANPA, Cambridge 2006
null
null
math.HO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Kazuo Kondo (1911-2001) was Chair of the Department of Mathematical Engineering at the University of Tokyo, Japan. Over a period of 50 years, he and a few colleagues wrote and published a voluminous series of papers and monographs on the applications of analytical geometry within a diverse range of subjects in the natural sciences. Inspired by Otto Fischer's attempt at a quaternionic unified theory in the late 1950's he adopted the mathematics of the revered Akitsugu Kawaguchi to produce his own speculative unified theory. The theory appears to successfully apply Kawaguchi's mathematics to the full range of natural phenomena, from the structure of fundamental particles to the geometry of living beings. The theories are testable and falsifiable. Kondo and his theories are now almost completely unknown and this paper serves as the barest introduction to his work
[ { "version": "v1", "created": "Wed, 5 Dec 2007 19:24:19 GMT" }, { "version": "v2", "created": "Tue, 2 Jun 2020 23:25:19 GMT" } ]
2020-06-04T00:00:00
[ [ "Croll", "Grenville J.", "" ] ]
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712.0642
Archil Kobakhidze
Archil Kobakhidze
Noncommutative corrections to classical black holes
5 pages
Phys.Rev.D79:047701,2009
10.1103/PhysRevD.79.047701
null
gr-qc hep-ph hep-th
null
We calculate leading long-distance noncommutative corrections to the classical Schwarzschild black hole which is sourced by a massive noncommutative scalar field. The energy-momentum tensor is taken up to ${\cal O}(\ell^4)$ in noncommutative parameter, and is treated in semiclassical (tree level) approximation. These noncommutative corrections can dominate classical post-post-Newtonian corrections providing $\ell > 1/M_P$, however, they are still too small to be observable in present-day experiments.
[ { "version": "v1", "created": "Wed, 5 Dec 2007 01:09:00 GMT" } ]
2009-09-02T00:00:00
[ [ "Kobakhidze", "Archil", "" ] ]
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712.0643
Andres Koropecki
Alejandro Kocsard and Andres Koropecki
Free curves and periodic points for torus homeomorphisms
to appear in Ergodic Theory and Dynamical Systems
null
null
null
math.DS
null
We study the relationship between free curves and periodic points for torus homeomorphisms in the homotopy class of the identity. By free curve we mean a homotopically nontrivial simple closed curve that is disjoint from its image. We prove that every rational point in the rotation set is realized by a periodic point provided that there is no free curve and the rotation set has empty interior. This gives a topological version of a theorem of Franks. Using this result, and inspired by a theorem of Guillou, we prove a version of the Poincar\'e-Birkhoff Theorem for torus homeomorphisms: in the absence of free curves, either there is a fixed point or the rotation set has nonempty interior.
[ { "version": "v1", "created": "Wed, 5 Dec 2007 01:15:15 GMT" } ]
2007-12-06T00:00:00
[ [ "Kocsard", "Alejandro", "" ], [ "Koropecki", "Andres", "" ] ]
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712.0644
Luis Molinuevo Balicas Dr
L. Balicas, Y. J. Jo, G. J. Shu, F. C. Chou, and P. A. Lee
Local moment, itinerancy and deviation from Fermi liquid behavior in Na$_x$CoO$_2$ for $0.71 \leq x \leq 0.84$
4 pages, 4 figures
null
10.1103/PhysRevLett.100.126405
null
cond-mat.str-el
null
Here we report the observation of Fermi surface (FS) pockets via the Shubnikov de Haas effect in Na$_x$CoO$_2$ for $x = 0.71$ and 0.84, respectively. Our observations indicate that the FS expected for each compound intersects their corresponding Brillouin zones, as defined by the previously reported superlattice structures, leading to small reconstructed FS pockets, but only if a precise number of holes per unit cell is \emph{localized}. For $0.71 \leq x < 0.75$ the coexistence of itinerant carriers and localized $S =1/2$ spins on a paramagnetic triangular superlattice leads at low temperatures to the observation of a deviation from standard Fermi-liquid behavior in the electrical transport and heat capacity properties, suggesting the formation of some kind of quantum spin-liquid ground state.
[ { "version": "v1", "created": "Wed, 5 Dec 2007 20:41:07 GMT" }, { "version": "v2", "created": "Wed, 5 Dec 2007 22:04:46 GMT" } ]
2009-11-13T00:00:00
[ [ "Balicas", "L.", "" ], [ "Jo", "Y. J.", "" ], [ "Shu", "G. J.", "" ], [ "Chou", "F. C.", "" ], [ "Lee", "P. A.", "" ] ]
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712.0645
Bin Wang
Xiaoping Rao, Bin Wang, Guohong Yang
Quasinormal modes and phase Transition of black holes
6 pages
Phys.Lett.B649:472-477,2007
10.1016/j.physletb.2007.04.049
null
gr-qc
null
We have studied the scalar field as well as the fermonic field perturbations in the background of the massless BTZ black holes. Comparing with the perturbation results in the generic nonrotating BTZ black hole background, we found that the massless BTZ hole contains only normal modes in the perturbations. We argued that this special property reflects that the massless BTZ black hole is a different phase from that of the generic nonrotating BTZ hole.
[ { "version": "v1", "created": "Wed, 5 Dec 2007 03:20:48 GMT" } ]
2008-11-26T00:00:00
[ [ "Rao", "Xiaoping", "" ], [ "Wang", "Bin", "" ], [ "Yang", "Guohong", "" ] ]
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712.0646
Takehiro Azuma
Takehiro Azuma (Tata Inst.), Subrata Bal (DIAS), Jun Nishimura (KEK and SOKENDAI)
The instability of intersecting fuzzy spheres
13 pages, (v3) reference added and some arguments refined
JHEP 0803:035,2008
10.1088/1126-6708/2008/03/035
TIFR/TH/07-33, DIAS-STP-07-20, KEK-TH-1104
hep-th
null
We discuss the classical and quantum stability of general configurations representing many fuzzy spheres in dimensionally reduced Yang-Mills-Chern-Simons models with and without supersymmetry. By performing one-loop perturbative calculations around such configurations, we find that intersecting fuzzy spheres are classically unstable in the class of models studied in this paper. We also discuss the large-N limit of the one-loop effective action as a function of the distance of fuzzy spheres. This shows, in particular, that concentric fuzzy spheres with different radii, which are identified with the 't Hooft-Polyakov monopoles, are perturbatively stable in the bosonic model and in the D=10 supersymmetric model.
[ { "version": "v1", "created": "Wed, 5 Dec 2007 03:24:50 GMT" }, { "version": "v2", "created": "Wed, 12 Dec 2007 08:45:12 GMT" }, { "version": "v3", "created": "Fri, 15 Feb 2008 14:11:16 GMT" } ]
2011-07-19T00:00:00
[ [ "Azuma", "Takehiro", "", "Tata Inst." ], [ "Bal", "Subrata", "", "DIAS" ], [ "Nishimura", "Jun", "", "KEK\n and SOKENDAI" ] ]
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712.0647
Maxim Pospelov
Maxim Pospelov
Bridging the primordial A=8 divide with Catalyzed Big Bang Nucleosynthesis
4 pages, 3 figures
null
null
UVIC-TH-07/15
hep-ph astro-ph nucl-th
null
Catalysis of nuclear reactions by metastable charged particles X^- opens the possibility for primordial production of elements with A>7. We calculate the abundance of ^9Be, where synthesis is mediated by the formation of (^8Be X^-) bound states, finding a dramatic enhancement over the standard BBN prediction: ^9Be/^1H = 10^{-13}\times(Y_X/10^{-5}). Thus observations of ^9Be abundances at low metallicity offers a uniquely sensitive probe of many particle physics models that predict X^-, including variants of supersymmetric models. Comparing the catalytically-enhanced abundances of primordial ^6Li and ^9Be, we find the relation ^9Be/^6Li = (2-5)\times 10^{-3} that holds over a wide range of X^- abundances and lifetimes.
[ { "version": "v1", "created": "Wed, 5 Dec 2007 14:22:07 GMT" } ]
2007-12-06T00:00:00
[ [ "Pospelov", "Maxim", "" ] ]
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712.0648
Nobuo Yoshida
Nobuo Yoshida
Central Limit Theorem for Branching Random Walks in Random Environment
15 pages
null
null
null
math.PR math-ph math.MP
null
We consider branching random walks in $d$-dimensional integer lattice with time-space i.i.d. offspring distributions. When $d \ge 3$ and the fluctuation of the environment is well moderated by the random walk, we prove a central limit theorem for the density of the population, together with upper bounds for the density of the most populated site and the replica overlap. We also discuss the phase transition of this model in connection with directed polymers in random environment.
[ { "version": "v1", "created": "Wed, 5 Dec 2007 04:32:31 GMT" } ]
2007-12-06T00:00:00
[ [ "Yoshida", "Nobuo", "" ] ]
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712.0649
Nobuo Yoshida
Yueyun Hu and Nobuo Yoshida
Localization for Branching Random Walks in Random Environment
17 pages
null
null
null
math.PR math-ph math.MP
null
We consider branching random walks in $d$-dimensional integer lattice with time-space i.i.d. offspring distributions. This model is known to exhibit a phase transition: If $d \ge 3$ and the environment is "not too random", then, the total population grows as fast as its expectation with strictly positive probability. If,on the other hand, $d \le 2$, or the environment is ``random enough", then the total population grows strictly slower than its expectation almost surely. We show the equivalence between the slow population growth and a natural localization property in terms of "replica overlap". We also prove a certain stronger localization property, whenever the total population grows strictly slower than its expectation almost surely.
[ { "version": "v1", "created": "Wed, 5 Dec 2007 04:40:20 GMT" } ]
2007-12-06T00:00:00
[ [ "Hu", "Yueyun", "" ], [ "Yoshida", "Nobuo", "" ] ]
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712.065
Evgeny Kalashnikov G.
A. V. Fedorov, E. G. Kalashnikov
Extended symmetrical classical electrodynamics
null
Phys. Rev. E77, 036610 (2008)
10.1103/PhysRevE.77.036610
null
physics.class-ph
null
In the present article, we discuss a modification of classical electrodynamics in which ``ordinary'' point charges are absent. The modified equations contain additional terms describing the induced charges and currents. The densities of the induced charges and currents depend on the vector k and the vectors of the electromagnetic field E and B. It is shown that the vectors E and B can be defined in terms of two 4-potentials and the components of k are the components of the 4-tensor of the third rank. The Lagrangian of modified electrodynamics is defined. The conditions are derived at which only one 4-potential determines the behavior of the electromagnetic field. It is also shown that static modified electrodynamics can describe the electromagnetic field in the inner region of the electric monopole. In the outer region of the electric monopole the electric field is governed by the Maxwell equations. It follows from boundary conditions at the interface between the inner and outer regions of the monopole that the vector k has a discrete spectrum. The electric and magnetic fields, energy and angular momentum of the monopole are found for different eigenvalues of k.
[ { "version": "v1", "created": "Wed, 5 Dec 2007 04:58:06 GMT" } ]
2009-11-13T00:00:00
[ [ "Fedorov", "A. V.", "" ], [ "Kalashnikov", "E. G.", "" ] ]
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712.0651
Jeffrey E. Mandula
Jeffrey E. Mandula
Note on the Lattice Fermion Chiral Symmetry Group
20 pages, pdf format only. All conclusions are unchanged. Material has been added and rearranged to clarify the logic of the arguments. References added
null
null
null
hep-lat
null
The group structure of the variant chiral symmetry discovered by Luscher in the Ginsparg-Wilson description of lattice chiral fermions is analyzed. It is shown that the group contains an infinite number of linearly independent symmetry generators, and the Lie algebra is given explicitly. CP is an automorphism of the chiral group, and the CP transformation properties of the symmetry generators is found. Features of the currents associated with these symmetries are discussed, including the fact that some different, non-commuting symmetry generators lead to the same Noether current. These strange features occur in all implementations of lattice fermions based on the Ginsparg-Wilson relation, including overlap, domain-wall, and perfect-action chiral fermions. The conclusions are illustrated in a solvable example, free overlap fermions.
[ { "version": "v1", "created": "Wed, 5 Dec 2007 04:58:28 GMT" }, { "version": "v2", "created": "Fri, 18 Jan 2008 18:01:50 GMT" } ]
2011-11-10T00:00:00
[ [ "Mandula", "Jeffrey E.", "" ] ]
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712.0652
Eugene Loginov
E.K. Loginov, A.N. Grishkov
On a construction of self-dual gauge fields in seven dimensions
10 pages, LaTeX, no figures
J.Nonlin.Math.Phys.14:562-569,2007
10.2991/jnmp.2007.14.4.5
null
hep-th
null
We consider gauge fields associated with a semisimple Malcev algebra. We construct a gauge-invariant Lagrangian and found a solution of modified Yang-Mills equations in seven dimensions.
[ { "version": "v1", "created": "Wed, 5 Dec 2007 05:20:11 GMT" } ]
2015-05-13T00:00:00
[ [ "Loginov", "E. K.", "" ], [ "Grishkov", "A. N.", "" ] ]
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712.0653
Sumio Watanabe
Sumio Watanabe
Equations of States in Singular Statistical Estimation
null
null
null
null
cs.LG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Learning machines which have hierarchical structures or hidden variables are singular statistical models because they are nonidentifiable and their Fisher information matrices are singular. In singular statistical models, neither the Bayes a posteriori distribution converges to the normal distribution nor the maximum likelihood estimator satisfies asymptotic normality. This is the main reason why it has been difficult to predict their generalization performances from trained states. In this paper, we study four errors, (1) Bayes generalization error, (2) Bayes training error, (3) Gibbs generalization error, and (4) Gibbs training error, and prove that there are mathematical relations among these errors. The formulas proved in this paper are equations of states in statistical estimation because they hold for any true distribution, any parametric model, and any a priori distribution. Also we show that Bayes and Gibbs generalization errors are estimated by Bayes and Gibbs training errors, and propose widely applicable information criteria which can be applied to both regular and singular statistical models.
[ { "version": "v1", "created": "Wed, 5 Dec 2007 05:39:07 GMT" }, { "version": "v2", "created": "Mon, 11 May 2009 05:49:09 GMT" } ]
2009-05-11T00:00:00
[ [ "Watanabe", "Sumio", "" ] ]
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712.0654
Muhammad Sharif
M. Sharif and Umber Sheikh
Complex Wave Numbers in the Vicinity of the Schwarzschild Event Horizon
21 pages, 9 figures, accepted for publication Int. J. Mod. Phys. A
Int.J.Mod.Phys.A23:1417-1433,2008
10.1142/S0217751X0803855X
null
gr-qc astro-ph
null
This paper is devoted to investigate the cold plasma wave properties outside the event horizon of the Schwarzschild planar analogue. The dispersion relations are obtained from the corresponding Fourier analyzed equations for non-rotating and rotating, non-magnetized and magnetized backgrounds. These dispersion relations provide complex wave numbers. The wave numbers are shown in graphs to discuss the nature and behavior of waves and the properties of plasma lying in the vicinity of the Schwarzschild event horizon.
[ { "version": "v1", "created": "Wed, 5 Dec 2007 05:43:40 GMT" } ]
2008-11-26T00:00:00
[ [ "Sharif", "M.", "" ], [ "Sheikh", "Umber", "" ] ]
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712.0655
Muhammad Sharif
M. Sharif and Umber Sheikh
Effects of Schwarzschild Geometry on Isothermal Plasma Wave Dispersion
17 pages, 3 figures accepted for publication in J. Korean Physical Society
J.Korean Phys.Soc.52:152-159,2008
10.3938/jkps.52.152
null
gr-qc astro-ph
null
The behavior of isothermal plasma waves has been analyzed near the Schwarzschild horizon. We consider a non-rotating background with non-magnetized and magnetized plasmas. The general relativistic magnetohydrodynamical equations for the Schwarzschild planar analogue spacetime with an isothermal state of the plasma are formulated. The perturbed form of these equations is linearized and Fourier analyzed by introducing simple harmonic waves. The determinant of these equations in each case leads to a complex dispersion relation, which gives complex values of the wave number. This has been used to discuss the nature of the waves and their characteristics near the horizon.
[ { "version": "v1", "created": "Wed, 5 Dec 2007 05:55:45 GMT" } ]
2011-08-31T00:00:00
[ [ "Sharif", "M.", "" ], [ "Sheikh", "Umber", "" ] ]
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712.0656
Fedor Gubarev V.
P.Yu.Boyko, F.V.Gubarev, S.M.Morozov
On the structure of QCD confining string
This paper has been withdrawn
PoSLAT2007:307,2007
null
ITEP-LAT/2007-24
hep-lat
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This paper had been withdrawn because the prime reported effect had not been confirmed in further investigations (see arXiv:0812.4488 [hep-lat]).
[ { "version": "v1", "created": "Wed, 5 Dec 2007 06:48:48 GMT" }, { "version": "v2", "created": "Wed, 24 Dec 2008 05:58:19 GMT" } ]
2008-12-24T00:00:00
[ [ "Boyko", "P. Yu.", "" ], [ "Gubarev", "F. V.", "" ], [ "Morozov", "S. M.", "" ] ]
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712.0657
Kyo Tsukada
K.Tsukada, T.Takahashi, T.Watanabe, Y.Fujii, K.Futatsukawa, O.Hashimoto, K.Hirose, K.Ito, S.Kameoka, H.Kanda, K.Maeda, A.Matsumura, Y.Miura, H.Miyase, S.N.Nakamura, H.Nomura, K.Nonaka, T.Osaka, Y.Okayasu, H.Tamura, H.Tsubota, M.Ukai, H.Yamauchi, M.Wakamatsu, T.Ishikawa, T.Kinoshita, F.Miyahara, T.Nakabayashi, H.Shimizu, T.Tamae, H.Yamazaki, A.Sasaki, O.Konno, P.Bydzovsky, M.Sotona
Photoproduction of neutral kaons on the liquid deuterium target in the threshold region
11 pages, 13 figures
Phys.Rev.C78:014001,2008; Erratum-ibid.C83:039904,2011
10.1103/PhysRevC.83.039904
null
nucl-ex
null
The photoproduction process of neutral kaons on a liquid deuterium target is investigated near the threshold region, Egamma = 0.8-1.1 GeV. K0 events are reconstructed from positive and negative pions, and differential cross sections are derived. Experimental momentum spectra are compared with those calculated in the spectator model using a realistic deuteron wave function. Elementary amplitudes as given by recent isobar models and a simple phenomenological model are used to study the effect of the new data on the angular behavior of the elementary cross section. The data favor a backward-peaked angular distribution of the elementary n(gamma,K0)Lambda process, which provides additional constraints on current models of kaon photoproduction. The present study demonstrates that the n(gamma,K0)Lambda reaction can provide key information on the mechanism of the photoproduction of strangeness.
[ { "version": "v1", "created": "Wed, 5 Dec 2007 07:03:01 GMT" } ]
2011-04-05T00:00:00
[ [ "Tsukada", "K.", "" ], [ "Takahashi", "T.", "" ], [ "Watanabe", "T.", "" ], [ "Fujii", "Y.", "" ], [ "Futatsukawa", "K.", "" ], [ "Hashimoto", "O.", "" ], [ "Hirose", "K.", "" ], [ "Ito", "K.", "" ], [ "Kameoka", "S.", "" ], [ "Kanda", "H.", "" ], [ "Maeda", "K.", "" ], [ "Matsumura", "A.", "" ], [ "Miura", "Y.", "" ], [ "Miyase", "H.", "" ], [ "Nakamura", "S. N.", "" ], [ "Nomura", "H.", "" ], [ "Nonaka", "K.", "" ], [ "Osaka", "T.", "" ], [ "Okayasu", "Y.", "" ], [ "Tamura", "H.", "" ], [ "Tsubota", "H.", "" ], [ "Ukai", "M.", "" ], [ "Yamauchi", "H.", "" ], [ "Wakamatsu", "M.", "" ], [ "Ishikawa", "T.", "" ], [ "Kinoshita", "T.", "" ], [ "Miyahara", "F.", "" ], [ "Nakabayashi", "T.", "" ], [ "Shimizu", "H.", "" ], [ "Tamae", "T.", "" ], [ "Yamazaki", "H.", "" ], [ "Sasaki", "A.", "" ], [ "Konno", "O.", "" ], [ "Bydzovsky", "P.", "" ], [ "Sotona", "M.", "" ] ]
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712.0658
Tomohito Maeda
Tomohito Maeda (Nihon Univ.), Kenji Yamada (Nihon Univ.), Masuho Oda (Kokushikan Univ.), and Shin Ishida (Nihon Univ.)
The qqbar S-wave axial-vector mesons in the covariant U~(12)-scheme
8 pages; Talk presented at the XII International Conference on Hadron Spectroscpy(Hadron 07), Frascati (Rome), 8-13 October 2007; Some typos were removed
null
null
null
hep-ph
null
We study the properties of axial vector mesons a1 and b1 as relativistic S-wave states which are predicted in the U~(12)-scheme, through the analyses of their radiative and pionic decays. Specifically, partial widths of the strong a1 (b1) -> rho(omega) pi processes, their D/S-wave amplitude ratios, and radiative transition widths of a1(b1) -> pi gamma processes are calculated by using a simple decay interaction model, and made a comparison with the respective experimental values.
[ { "version": "v1", "created": "Wed, 5 Dec 2007 07:11:23 GMT" }, { "version": "v2", "created": "Mon, 17 Mar 2008 07:39:25 GMT" } ]
2008-03-17T00:00:00
[ [ "Maeda", "Tomohito", "", "Nihon Univ." ], [ "Yamada", "Kenji", "", "Nihon Univ." ], [ "Oda", "Masuho", "", "Kokushikan Univ." ], [ "Ishida", "Shin", "", "Nihon Univ." ] ]
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712.0659
Shengrong Zou
Sheng-Rong Zou, Yu-Jing Peng, Zhong-Wei Guo, Ta Zhou, Chang-gui Gu, Da-Ren He
An Empirical Study of Immune System Based On Bipartite Network
6 pages, 5 figures
null
null
null
nlin.AO q-bio.CB
null
Immune system is the most important defense system to resist human pathogens. In this paper we present an immune model with bipartite graphs theory. We collect data through COPE database and construct an immune cell- mediators network. The act degree distribution of this network is proved to be power-law, with index of 1.8. From our analysis, we found that some mediators with high degree are very important mediators in the process of regulating immune activity, such as TNF-alpha, IL-8, TNF-alpha receptors, CCL5, IL-6, IL-2 receptors, TNF-beta receptors, TNF-beta, IL-4 receptors, IL-1 beta, CD54 and so on. These mediators are important in immune system to regulate their activity. We also found that the assortative of the immune system is -0.27. It reveals that our immune system is non-social network. Finally we found similarity of the network is 0.13. Each two cells are similar to small extent. It reveals that many cells have its unique features. The results show that this model could describe the immune system comprehensive.
[ { "version": "v1", "created": "Wed, 5 Dec 2007 07:18:16 GMT" } ]
2007-12-06T00:00:00
[ [ "Zou", "Sheng-Rong", "" ], [ "Peng", "Yu-Jing", "" ], [ "Guo", "Zhong-Wei", "" ], [ "Zhou", "Ta", "" ], [ "Gu", "Chang-gui", "" ], [ "He", "Da-Ren", "" ] ]
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712.066
Oliver Bembom
Oliver Bembom, Mark J. van der Laan
A practical illustration of the importance of realistic individualized treatment rules in causal inference
Published in at http://dx.doi.org/10.1214/07-EJS105 the Electronic Journal of Statistics (http://www.i-journals.org/ejs/) by the Institute of Mathematical Statistics (http://www.imstat.org)
Electronic Journal of Statistics 2007, Vol. 1, 574-596
10.1214/07-EJS105
IMS-EJS-EJS_2007_105
stat.AP
null
The effect of vigorous physical activity on mortality in the elderly is difficult to estimate using conventional approaches to causal inference that define this effect by comparing the mortality risks corresponding to hypothetical scenarios in which all subjects in the target population engage in a given level of vigorous physical activity. A causal effect defined on the basis of such a static treatment intervention can only be identified from observed data if all subjects in the target population have a positive probability of selecting each of the candidate treatment options, an assumption that is highly unrealistic in this case since subjects with serious health problems will not be able to engage in higher levels of vigorous physical activity. This problem can be addressed by focusing instead on causal effects that are defined on the basis of realistic individualized treatment rules and intention-to-treat rules that explicitly take into account the set of treatment options that are available to each subject. We present a data analysis to illustrate that estimators of static causal effects in fact tend to overestimate the beneficial impact of high levels of vigorous physical activity while corresponding estimators based on realistic individualized treatment rules and intention-to-treat rules can yield unbiased estimates. We emphasize that the problems encountered in estimating static causal effects are not restricted to the IPTW estimator, but are also observed with the $G$-computation estimator, the DR-IPTW estimator, and the targeted MLE. Our analyses based on realistic individualized treatment rules and intention-to-treat rules suggest that high levels of vigorous physical activity may confer reductions in mortality risk on the order of 15-30%, although in most cases the evidence for such an effect does not quite reach the 0.05 level of significance.
[ { "version": "v1", "created": "Wed, 5 Dec 2007 07:18:54 GMT" } ]
2007-12-18T00:00:00
[ [ "Bembom", "Oliver", "" ], [ "van der Laan", "Mark J.", "" ] ]
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712.0661
Shengrong Zou
Sheng-Rong Zou, Ta Zhou, Yu-Jing Peng, Zhong-Wei Guo, Chang-gui Gu, Da-Ren He
A Collaboration Network Model Of Cytokine-Protein Network
10 pages, 3 figures
null
null
null
nlin.AO q-bio.MN
null
Complex networks provide us a new view for investigation of immune systems. In this paper we collect data through STRING database and present a model with cooperation network theory. The cytokine-protein network model we consider is constituted by two kinds of nodes, one is immune cytokine types which can act as acts, other one is protein type which can act as actors. From act degree distribution that can be well described by typical SPL -shifted power law functions, we find that HRAS.TNFRSF13C.S100A8.S100A1.MAPK8.S100A7.LIF.CCL4.CXCL13 are highly collaborated with other proteins. It reveals that these mediators are important in cytokine-protein network to regulate immune activity. Dyad act degree distribution is another important property to generalized collaboration network. Dyad is two proteins and they appear in one cytokine collaboration relationship. The dyad act degree distribution can be well described by typical SPL functions. The length of the average shortest path is 1.29. These results show that this model could describe the cytokine-protein collaboration preferably
[ { "version": "v1", "created": "Wed, 5 Dec 2007 07:23:07 GMT" } ]
2007-12-06T00:00:00
[ [ "Zou", "Sheng-Rong", "" ], [ "Zhou", "Ta", "" ], [ "Peng", "Yu-Jing", "" ], [ "Guo", "Zhong-Wei", "" ], [ "Gu", "Chang-gui", "" ], [ "He", "Da-Ren", "" ] ]
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712.0662
Baris Coskunuzer
Baris Coskunuzer
Least Area Planes in Hyperbolic 3-Space are Properly Embedded
11 pages
Indiana Univ. Math. J. 58 (2009) 379-390.
10.1512/iumj.2009.58.3447
null
math.GT math.DG
null
We show that if P is an embedded least area (area minimizing) plane in hyperbolic 3-space whose asymptotic boundary is a simple closed curve with at least one smooth point, then P is properly embedded.
[ { "version": "v1", "created": "Wed, 5 Dec 2007 07:27:20 GMT" } ]
2009-03-14T00:00:00
[ [ "Coskunuzer", "Baris", "" ] ]
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712.0663
Lajos Soukup
Peter L. Erdos, Lajos Soukup
Quasi-kernels and quasi-sinks in infinite graphs
null
null
null
null
math.CO
null
Given a directed graph G=(V,E) an independent set A of the vertices V is called quasi-kernel (quasi-sink) iff for each point v there is a path of length at most 2 from some point of A to v (from v to some point of A). Every finite directed graph has a quasi-kernel. The plain generalization for infinite graphs fails, even for tournaments. We investigate the following conjecture here: for any digraph G=(V,E) there is a a partition (V_0,V_1) of the vertex set such that the induced subgraph G[V_0] has a quasi-kernel and the induced subgraph G[V_1] has a quasi-sink.
[ { "version": "v1", "created": "Wed, 5 Dec 2007 08:08:31 GMT" } ]
2007-12-06T00:00:00
[ [ "Erdos", "Peter L.", "" ], [ "Soukup", "Lajos", "" ] ]
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712.0664
Kenji Yamada
Kenji Yamada, Tomohito Maeda
On the Existence of Light-Scalar Mesons kappa(800) and kappa'(1150): The U~(12) Scheme and BES II Data
8 pages, 1 figure, talk given at the XII Conference on Hadron Spectroscopy (HADRON 07), Frascati, Italy, 8-13 October 2007
null
null
null
hep-ph
null
We present that there should exist a light strange-scalar meson kappa', in addition to the kappa(800), which has a mass around 1.1-1.2 GeV, a rather narrow width, and couples strongly to kappa(800)sigma(600) (Kpipipi) but weakly to Kpi, based upon the U~(12)-classification scheme of hadrons and BES II data on J/psi -> barK*(892)0K+pi- decay.
[ { "version": "v1", "created": "Wed, 5 Dec 2007 08:06:52 GMT" } ]
2007-12-06T00:00:00
[ [ "Yamada", "Kenji", "" ], [ "Maeda", "Tomohito", "" ] ]
[ 0.0642255917, 0.0408414416, -0.0280448161, -0.0324630179, -0.0208248254, 0.0731697604, -0.060507834, 0.0119278021, 0.0555508249, -0.0116045186, -0.1161664203, 0.0074287779, -0.0310890656, 0.0456637479, 0.0714994594, 0.0667040944, -0.0438587517, 0.0509979203, 0.0467144176, 0.0191679988, -0.1239252165, -0.0864782482, 0.1169207469, 0.0613160431, 0.0964461491, -0.0239229556, -0.0267786235, -0.0271961968, 0.0329479426, -0.024771573, -0.0041016554, -0.055281423, -0.0711222962, -0.1163819432, -0.0460947938, 0.0920279473, -0.0433468856, 0.0654109642, -0.1078149378, -0.0806591511, -0.0931055546, 0.0095705288, -0.027667651, 0.0754327402, -0.0004958693, 0.0607772358, -0.0530184396, -0.0410569645, 0.0325169004, 0.0196933337, 0.0031705324, -0.0408145003, 0.0084659783, 0.0800125897, -0.1036661416, 0.0303616785, 0.0211211666, -0.0339447334, 0.0429697223, -0.0270749666, 0.0313045867, -0.1091619506, -0.082329452, 0.000432728, -0.1553914398, 0.0209595263, -0.0117526902, 0.0511056818, -0.0017342796, 0.0643872321, 0.0579754487, 0.074409008, -0.0128774466, -0.0090182535, -0.0158004649, -0.0031065494, 0.0382012948, -0.0335136876, -0.0062400387, 0.0773185566, -0.0008233619, 0.0473609865, -0.0926206335, -0.071068421, -0.0082976017, -0.0719843879, -0.0586758964, 0.0270480253, -0.0716611072, 0.0809285566, 0.0405181572, -0.0093617421, -0.0620164908, 0.0366118215, 0.1410592198, 0.019895386, 0.0446130782, -0.0546887368, -0.0226432923, 0.0028708219, -0.0903576463, -0.010574054, 0.0728464723, 0.0328671224, 0.104312703, -0.0276945923, -0.0244887006, 0.0441281535, -0.0120490333, 0.0022848712, 0.0241250079, 0.0419998728, -0.0401948765, 0.0508632213, -0.0898727253, -0.1056597158, -0.0436162874, 0.049408447, -0.0463372543, 0.0970388353, -0.0006743485, 0.1199380606, 0.0806052685, -0.0499203093, -0.0111936796, -0.024771573, 0.0090788696, -0.0871786997, 0.0032850285, -0.0210807566, 0.0755943805, -0.1251105964, 0.0338639133, -0.0080349343, -0.0733314008, 0.063902311, 0.0247850437, -0.0475495681, 0.1146577671, 0.0179018062, 0.0370159224, -0.0046236231, 0.0459331498, 0.0799587071, -0.0125878388, 0.0904654115, -0.0570594817, -0.0109444829, 0.0850773528, -0.0953146592, -0.0779651254, 0.0109040719, 0.0705296099, -0.0264418703, -0.1159508973, -0.1123947874, -0.0670273751, 0.0400062948, -0.0190871768, -0.029176306, 0.0629863366, 0.0508901589, 0.0806591511, 0.0843230262, 0.0535572469, 0.0145612126, -0.1188604459, -0.0445053168, -0.0985474885, -0.1507577151, 0.0389286838, -0.0350492857, 0.0004592473, -0.0499741919, -0.0443975553, 0.033836972, 0.0529645607, -0.0966077894, -0.1043665856, -0.0282603372, 0.0629863366, 0.0349415243, 0.0520755313, 0.0507285185, -0.0462294929, -0.0628785789, 0.039575249, 0.1491413116, -0.0032547207, 0.0104124127, -0.0293648876, 0.1201535836, 0.0810363144, 0.1126103029, 0.0614776835, -0.0593224615, -0.0057584816, 0.1008643508, 0.029688172, -0.0070583494, 0.0267651528, -0.074624531, 0.1299598366, -0.08373034, -0.0100621888, -0.0913274959, 0.0754866228, -0.0493815057, -0.0536380671, -0.0541229919, 0.0579215698, -0.0010481447, 0.0608311184, 0.1275890917, -0.0781267658, -0.0042498265, -0.1108861268, 0.0317895114, -0.0064286208, 0.0142244594, -0.1386884898, 0.0520216525, 0.0560357496, 0.0613160431, 0.0021131269, -0.0034651915, 0.0956918225, -0.0173091199, -0.0160294566, 0.0467952415, 0.0256201923, -0.0274521299, -0.0463103168, 0.0073008118, 0.0017048137, -0.0622320101, -0.0787733346, -0.0096042044, -0.0195855722, -0.0016071552, -0.0313045867, -0.0804975107, -0.0023387517, 0.118644923, 0.0073210169, 0.0358574912, -0.0774263218, 0.1108861268, 0.0060447217, -0.0675661862, 0.0444244966, 0.1142267212, 0.0073008118, -0.060507834, -0.0368004031, -0.0198415052 ]
712.0665
Mohammad T. Dibaei
Mohammad T. Dibaei and Raheleh Jafari
Modules with Finite Cousin Cohomologies Have Uniform Local Cohomological Annihilators
9 pages, to appear in Journal of Algebra
null
null
null
math.AC
null
Let A be a Noetherian ring. It is shown that any finite A--module M of finite Krull dimension with finite Cousin complex cohomologies has a uniform local cohomological annihilator. The converse is also true for a finite module M satisfying (S_2) which is over a local ring with Cohen--Macaulay formal fibres.
[ { "version": "v1", "created": "Wed, 5 Dec 2007 08:38:15 GMT" } ]
2007-12-06T00:00:00
[ [ "Dibaei", "Mohammad T.", "" ], [ "Jafari", "Raheleh", "" ] ]
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712.0666
Lin-Tian Luh
Lin-Tian Luh
An Improved Error Bound for Multiquadric and Inverse Multiquadric Interpolation
12 pages
null
null
null
math.NA
null
A new error bound which is better than the current exponential-type error bound is presented in this paper.
[ { "version": "v1", "created": "Wed, 5 Dec 2007 08:50:46 GMT" } ]
2007-12-06T00:00:00
[ [ "Luh", "Lin-Tian", "" ] ]
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712.0667
Christopher Deninger
Christopher Deninger
Determinants on von Neumann algebras, Mahler measures and Ljapunov exponents
Final version
null
null
null
math.OA math.DS
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
For an ergodic measure preserving action on a probability space, consider the corresponding crossed product von Neumann algebra. We calculate the Fuglede-Kadison determinant for a class of operators in this von Neumann algebra in terms of the Ljapunov exponents of an associated measurable cocycle. The proof is based on recent work of Dykema and Schultz. As an application one obtains formulas for the Fuglede-Kadison determinant of noncommutative polynomials in the von Neumann algebra of the discrete Heisenberg group. These had been previously obtained by Lind and Schmidt via entropy considerations.
[ { "version": "v1", "created": "Wed, 5 Dec 2007 08:57:16 GMT" }, { "version": "v2", "created": "Tue, 1 Sep 2009 10:25:52 GMT" } ]
2009-09-01T00:00:00
[ [ "Deninger", "Christopher", "" ] ]
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712.0668
Miriam Giorgini
C. Ciocca, M. Cuffiani, G. Giacomelli (Dip. di Fisica of the University of Bologna and INFN Sezione di Bologna)
Bose-Einstein Correlations in Multihadron Events at LEP
8 pages, 10 eps figures. Invited paper at the ``Ninth Workshop on Non Perturbative QCD'', Institut d'Astrophysique de Paris, Paris, France, 4-8 June 2007
ECONFC0706044:13,2007
null
null
hep-ex
null
Bose-Einstein correlations in pairs of identical particles were analyzed in e+ e- multihadron annihilations at ~91.2 GeV at LEP. The first studies involved identical charged pions and the emitting source size was determined. Then the study of charged kaons suggested that the radius depends on the mass of the emitted particles. Subsequenty the dependence of the source radius on the event multiplicity was analyzed. The study of the correlations in neutral pions and neutral kaons extended these concepts to neutral particles. The shape of the source was analyzed in 3 dimensions and was found not to be spherically symmetric. In recent studies at LEP the correlations were analyzed in intervals of the average pair transverse momentum and of the pair rapidity to study the correlations between the pion production points and their momenta (position-momentum correlations). The latest e+ e- data are consistent with an expanding source.
[ { "version": "v1", "created": "Wed, 5 Dec 2007 09:01:48 GMT" } ]
2008-11-26T00:00:00
[ [ "Ciocca", "C.", "", "Dip. di Fisica of the\n University of Bologna and INFN Sezione di Bologna" ], [ "Cuffiani", "M.", "", "Dip. di Fisica of the\n University of Bologna and INFN Sezione di Bologna" ], [ "Giacomelli", "G.", "", "Dip. di Fisica of the\n University of Bologna and INFN Sezione di Bologna" ] ]
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712.0669
Khaled Qazaqzeh Dr
Khaled Qazaqzeh
Integral Lattices of the SU(2)-TQFT-Modules
10 pages This version has been just accepted at Kobe Journal of Mathematics
null
null
null
math.GT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We find bases for naturally defined lattices over certain rings of integers in the SU(2)-TQFT-theory modules of surfaces. We consider the TQFT where the Kauffman's A variable is a root of unity of order four times an odd prime. As an application, we show that the Frohman Kania-Bartoszynska ideal invariant for 3-manifolds with boundary using the SU(2)-TQFT-theory is equal to the product of the ideals using the 2^{'}-theory and the SO(3)-TQFT-theory under a certain change of coefficients.
[ { "version": "v1", "created": "Wed, 5 Dec 2007 09:08:22 GMT" }, { "version": "v2", "created": "Mon, 11 Jul 2011 02:40:04 GMT" } ]
2011-07-12T00:00:00
[ [ "Qazaqzeh", "Khaled", "" ] ]
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712.067
Adolfo del Campo
J. Echanobe, A. del Campo, J. G. Muga
Disclosing hidden information in the quantum Zeno effect: Pulsed measurement of the quantum time of arrival
5 pages, 4 figures, minor changes
Phys. Rev. A 77, 032112 (2008)
10.1103/PhysRevA.77.032112
null
quant-ph cond-mat.other
null
Repeated measurements of a quantum particle to check its presence in a region of space was proposed long ago [G. R. Allcock, Ann. Phys. {\bf 53}, 286 (1969)] as a natural way to determine the distribution of times of arrival at the orthogonal subspace, but the method was discarded because of the quantum Zeno effect: in the limit of very frequent measurements the wave function is reflected and remains in the original subspace. We show that by normalizing the small bits of arriving (removed) norm, an ideal time distribution emerges in correspondence with a classical local-kinetic-energy distribution.
[ { "version": "v1", "created": "Wed, 5 Dec 2007 09:22:03 GMT" }, { "version": "v2", "created": "Thu, 24 Jan 2008 14:00:44 GMT" } ]
2009-11-13T00:00:00
[ [ "Echanobe", "J.", "" ], [ "del Campo", "A.", "" ], [ "Muga", "J. G.", "" ] ]
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712.0671
Elke Roediger
E. Roediger, M. Brueggen (Jacobs University Bremen)
Ram pressure stripping of disc galaxies orbiting in clusters. II. Galactic wakes
23 pages, 23 figures, accepted by MNRAS. Additions to method, result and discussion section, references added. Results and conclusions essentially unchanged. high resolution pdf available at http://www.faculty.iu-bremen.de/eroediger/PAPERS/eroediger_wakes.pdf
null
10.1111/j.1365-2966.2008.13415.x
null
astro-ph
null
We present 3D hydrodynamical simulations of ram pressure stripping of a disc galaxy orbiting in a galaxy cluster. In this paper, we focus on the properties of the galaxies' tails of stripped gas. The galactic wakes show a flaring width, where the flaring angle depends on the gas disc's cross-section with respect to the galaxy's direction of motion. The velocity in the wakes shows a significant turbulent component of a few 100 km/s. The stripped gas is deposited in the cluster rather locally, i.e. within ~150 kpc from where it was stripped. We demonstrate that the most important quantity governing the tail density, length and gas mass distribution along the orbit is the galaxy's mass loss per orbital length. This in turn depends on the ram pressure as well as the galaxy's orbital velocity. For a sensitivity limit of ~10^19 cm^-2 in projected gas density, we find typical tail lengths of 40 kpc. Such long tails are seen even at large distances (0.5 to 1 Mpc) from the cluster centre. At this sensitivity limit, the tails show little flaring, but a width similar to the gas disc's size. Morphologically, we find good agreement with the HI tails observed in the Virgo cluster by Chung et al. (2007). However, the observed tails show a much smaller velocity width than predicted from the simulation. The few known X-ray and H$\alpha$ tails are generally much narrower and much straighter than the tails in our simulations. Thus, additional physics like a viscous ICM, the influence of cooling and tidal effects may be needed to explain the details of the observations. We discuss the hydrodynamical drag as a heat source for the ICM but conclude that it is not likely to play an important role, especially not in stopping cooling flows.
[ { "version": "v1", "created": "Wed, 5 Dec 2007 09:37:56 GMT" }, { "version": "v2", "created": "Tue, 6 May 2008 08:11:43 GMT" } ]
2009-11-13T00:00:00
[ [ "Roediger", "E.", "", "Jacobs University Bremen" ], [ "Brueggen", "M.", "", "Jacobs University Bremen" ] ]
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712.0672
Adi Armoni
Adi Armoni, Mikhail Shifman, Mithat Unsal
Planar Limit of Orientifold Field Theories and Emergent Center Symmetry
28 pages, 1 figure. v2: typos corrected, refs. added
Phys.Rev.D77:045012,2008
10.1103/PhysRevD.77.045012
UMN-TH-2624/07, FTPI-MINN-07/33, SLAC-PUB-13032
hep-th hep-lat hep-ph
null
We consider orientifold field theories (i.e. SU(N) Yang--Mills theories with fermions in the two-index symmetric or antisymmetric representations) on R3xS1 where the compact dimension can be either temporal or spatial. These theories are planar equivalent to supersymmetric Yang--Mills. The latter has Z_N center symmetry. The famous Polyakov criterion establishing confinement-deconfinement phase transition as that from Z_N symmetric to Z_N broken phase applies. At the Lagrangian level the orientifold theories have at most a Z_2 center. We discuss how the full Z_N center symmetry dynamically emerges in the orientifold theories in the limit N-->infinity. In the confining phase the manifestation of this enhancement is the existence of stable k-strings in the large-N limit of the orientifold theories. These strings are identical to those of supersymmetric Yang--Mills theories. We argue that critical temperatures (and other features) of the confinement-deconfinement phase transition are the same in the orientifold daughters and their supersymmetric parent up to 1/N corrections. We also discuss the Abelian and non-Abelian confining regimes of four-dimensional QCD-like theories.
[ { "version": "v1", "created": "Wed, 5 Dec 2007 09:24:54 GMT" }, { "version": "v2", "created": "Mon, 10 Dec 2007 09:42:42 GMT" } ]
2008-11-26T00:00:00
[ [ "Armoni", "Adi", "" ], [ "Shifman", "Mikhail", "" ], [ "Unsal", "Mithat", "" ] ]
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712.0673
Vincent Mathieu
Bernard Silvestre-Brac, Vincent Mathieu
Spin dependent operators in correlated gaussian bases
16 pages
null
10.1103/PhysRevE.77.036706
null
physics.comp-ph hep-ph
null
In their textbook, Suzuki and Varga [Y. Suzuki and K. Varga, {\em Stochastic Variational Approach to Quantum-Mechanical Few-Body Problems} (Springer, Berlin, 1998)] present the stochastic variational method with the correlated Gaussian basis in a very exhaustive way. The matrix elements for central potentials are put under a pleasant form but the elements for spin dependent operators, when treated, are given as very cumbersome expressions. In this paper, we find a lot of new formulae for those elements. Their expressions are given in terms of the same geometrical functions that appear in the case of central potentials. These functions get therefore a universal status; this property is very useful for numerical applications.
[ { "version": "v1", "created": "Wed, 5 Dec 2007 09:35:16 GMT" } ]
2009-11-13T00:00:00
[ [ "Silvestre-Brac", "Bernard", "" ], [ "Mathieu", "Vincent", "" ] ]
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712.0674
Christopher Gorham Lester
Jonathan L. Feng, Christopher G. Lester, Yosef Nir and Yael Shadmi
The Standard Model and Supersymmetric Flavor Puzzles at the Large Hadron Collider
v1: 18 pages
Phys.Rev.D77:076002,2008
10.1103/PhysRevD.77.076002
null
hep-ph
null
Can the Large Hadron Collider explain the masses and mixings of the known fermions? A promising possibility is that these masses and mixings are determined by flavor symmetries that also govern new particles that will appear at the LHC. We consider well-motivated examples in supersymmetry with both gravity- and gauge-mediation. Contrary to spreading belief, new physics need not be minimally flavor violating. We build non-minimally flavor violating models that successfully explain all known lepton masses and mixings, but span a wide range in their predictions for slepton flavor violation. In natural and favorable cases, these models have metastable sleptons and are characterized by fully reconstructible events. We outline many flavor measurements that are then possible and describe their prospects for resolving both the standard model and new physics flavor puzzles at the Large Hadron Collider.
[ { "version": "v1", "created": "Wed, 5 Dec 2007 15:38:42 GMT" } ]
2008-11-26T00:00:00
[ [ "Feng", "Jonathan L.", "" ], [ "Lester", "Christopher G.", "" ], [ "Nir", "Yosef", "" ], [ "Shadmi", "Yael", "" ] ]
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712.0675
Nikolaos Lazarides
N. Lazarides
Mobile $\pi-$kinks and half-integer zero-field-like steps in highly discrete alternating $0-\pi$ Josephson junction arrays
7 pages, 8 figures, submitted to Supercond. Sci. Technol
Supercond. Sci. Technol. 21, 045003 (2008)
10.1088/0953-2048/21/4/045003
null
cond-mat.supr-con
null
The dynamics of a one-dimensional, highly discrete, linear array of alternating $0-$ and $\pi-$ Josephson junctions is studied numerically, under constant bias current at zero magnetic field. The calculated current - voltage characteristics exhibit half-integer and integer zero-field-like steps for even and odd total number of junctions, respectively. Inspection of the instantaneous phases reveals that, in the former case, single $\pi-$kink excitations (discrete semi-fluxons) are supported, whose propagation in the array gives rise to the $1/2-$step, while in the latter case, a pair of $\pi-$kink -- $\pi-$antikink appears, whose propagation gives rise to the $1-$step. When additional $2\pi-$kinks are inserted in the array, they are subjected to fractionalization, transforming themselves into two closely spaced $\pi-$kinks. As they propagate in the array along with the single $\pi-$kink or the $\pi-$kink - $\pi-$antikink pair, they give rise to higher half-integer or integer zero-field-like steps, respectively.
[ { "version": "v1", "created": "Wed, 5 Dec 2007 09:58:18 GMT" } ]
2010-03-09T00:00:00
[ [ "Lazarides", "N.", "" ] ]
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712.0676
Felix Finster
Felix Finster and W\"atzold Plaum
A Lattice Model for the Fermionic Projector in a Static and Isotropic Space-Time
16 pages, LaTeX, 3 figures, minor improvements (published version)
Math. Nachr.281:803-816, 2008
10.1002/mana.200710642
null
math-ph hep-lat math.MP
null
We introduce a lattice model for a static and isotropic system of relativistic fermions. An action principle is formulated, which describes a particle-particle interaction of all fermions. The model is designed specifically for a numerical analysis of the nonlinear interaction, which is expected to lead to the formation of a Dirac sea structure. We discuss basic properties of the system. It is proved that the minimum of the variational principle is attained. First numerical results reveal an effect of spontaneous symmetry breaking.
[ { "version": "v1", "created": "Wed, 5 Dec 2007 11:04:38 GMT" }, { "version": "v2", "created": "Sun, 16 Mar 2008 21:06:43 GMT" } ]
2014-11-18T00:00:00
[ [ "Finster", "Felix", "" ], [ "Plaum", "Wätzold", "" ] ]
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712.0677
Julien Lavalle
Julien Lavalle
Anti-proton and positron Cosmic Rays from Dark Matter annihilation around Intermediate Mass Black Holes
Proceeding of the RICAP07 conference (Roma, Italy, June 2007)
Nucl.Instrum.Meth.A588:247-249,2008
10.1016/j.nima.2008.01.047
null
astro-ph
null
Intermediate Mass Black Holes (IMBHs) are candidates to seed the Supermassive Black Holes (SMBHs), and some could still wander in the Galaxy. In the context of annihilating dark matter (DM), they are expected to drive huge annihilation rates, and could therefore significantly enhance the primary cosmic rays (CRs) expected from annihilation of the DM of the Galactic halo. In this proceeding (the original paper is Brun et al. 2007), we briefly explain the method to derive estimates of such exotic contributions to the anti-proton and positron CR spectra, and the associated statistical uncertainties connected to the properties of IMBHs. We find boost factors of order $10^4$ to the exotic fluxes, but associated with very large statistical uncertainties.
[ { "version": "v1", "created": "Wed, 5 Dec 2007 10:07:52 GMT" } ]
2008-11-26T00:00:00
[ [ "Lavalle", "Julien", "" ] ]
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712.0678
Felix Finster
Felix Finster and Stefan Hoch
An Action Principle for the Masses of Dirac Particles
43 pages, LaTeX, 8 figures, minor corrections (published version)
Adv.Theor.Math.Phys. 13:1653-1711,2009
10.4310/ATMP.2009.v13.n6.a2
null
math-ph hep-th math.MP
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A variational principle is introduced which minimizes an action formulated for configurations of vacuum Dirac seas. The action is analyzed in position and momentum space. We relate the corresponding Euler-Lagrange equations to the notion of state stability. Examples of numerical minimizers are constructed and discussed.
[ { "version": "v1", "created": "Wed, 5 Dec 2007 11:09:17 GMT" }, { "version": "v2", "created": "Mon, 17 Nov 2008 18:44:34 GMT" }, { "version": "v3", "created": "Sun, 20 Sep 2009 20:12:15 GMT" } ]
2014-01-28T00:00:00
[ [ "Finster", "Felix", "" ], [ "Hoch", "Stefan", "" ] ]
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