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711.4608
Dan Ralph
D. C. Ralph and M. D. Stiles
Spin Transfer Torques
27 pages, 11 figures; Corrected errors in the discussion about one of the toy models for spin transfer torques
J. Magn. Magn. Mater. 320, 1190-1216 (2008)
10.1016/j.jmmm.2007.12.019
null
cond-mat.other
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This tutorial article introduces the physics of spin transfer torques in magnetic devices. We provide an elementary discussion of the mechanism of spin transfer torque, and review the theoretical and experimental progress in this field. Our intention is to be accessible to beginning graduate students. This is the introductory paper for a cluster of "Current Perspectives" articles on spin transfer torques published in volume 320 of the Journal of Magnetism and Magnetic Materials. This article is meant to set the stage for the others which follow it in this cluster; they focus in more depth on particularly interesting aspects of spin-torque physics and highlight unanswered questions that might be productive topics for future research.
[ { "version": "v1", "created": "Wed, 28 Nov 2007 22:08:51 GMT" }, { "version": "v2", "created": "Fri, 21 Mar 2008 20:22:53 GMT" }, { "version": "v3", "created": "Sat, 28 Feb 2009 18:10:00 GMT" } ]
2009-11-13T00:00:00
[ [ "Ralph", "D. C.", "" ], [ "Stiles", "M. D.", "" ] ]
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711.4609
Abbie Mclaughlin Dr
A. C. Mclaughlin, F. Sher, S. A. J. Kimber and J. P. Attfield
Induced antiferromagnetism and large magnetoresistances in RuSr2(Nd,Y,Ce)2Cu2O10-d ruthenocuprates
22 pages, 11 figures
Physical Review B, 76, 094514 (2007)
10.1103/PhysRevB.76.094514
null
cond-mat.supr-con cond-mat.str-el
null
RuSr2(Nd,Y,Ce)2Cu2O10-d ruthenocuprates have been studied by neutron diffraction, magnetotransport and magnetisation measurements and the electronic phase diagram is reported. Separate Ru and Cu spin ordering transitions are observed, with spontaneous Cu antiferromagnetic order for low hole doping levels p, and a distinct, induced-antiferromagnetic Cu spin phase in the 0.02 < p < 0.06 pseudogap region. This ordering gives rise to large negative magnetoresistances which vary systematically with p in the RuSr2Nd1.8-xY0.2CexCu2O10-d series. A collapse of the magnetoresistance (MR) and magnetisation in the pre-superconducting region may signify the onset of superconducting fluctuations.
[ { "version": "v1", "created": "Wed, 28 Nov 2007 22:09:31 GMT" } ]
2007-11-30T00:00:00
[ [ "Mclaughlin", "A. C.", "" ], [ "Sher", "F.", "" ], [ "Kimber", "S. A. J.", "" ], [ "Attfield", "J. P.", "" ] ]
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711.461
Jacopo De Simoi
Jacopo De Simoi
Potts models on hierarchical lattices and Renormalization Group dynamics II: examples and numerical results
16 pages, 13 figures
null
null
null
cond-mat.stat-mech math.DS
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We obtain the exact renormalization map and plots of Lee-Yang and Fisher zeros distributions for Potts models on a number of hierarchical lattices: the diamond hierarchical lattice, a lattice we call spider web, the Sierpinski gasket and cylinders. Such models are only examples among the ones we can study in the general framework of hierarchical lattices, developed in a previous paper.
[ { "version": "v1", "created": "Wed, 28 Nov 2007 22:40:38 GMT" }, { "version": "v2", "created": "Sun, 3 Aug 2008 19:42:10 GMT" } ]
2008-08-03T00:00:00
[ [ "De Simoi", "Jacopo", "" ] ]
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711.4611
Abbie Mclaughlin Dr
A. C. Mclaughlin, L. Begg, C. Harrow, S. A. J. Kimber, F. Sher and J. P. Attfield
Chemical Tuning of Positive and Negative Magnetoresistances, and Superconductivity in 1222-type Ruthenocuprates
null
JACS, 128, 12364 (2006)
10.1021/JA064778h
null
cond-mat.supr-con cond-mat.str-el
null
High critical-temperature superconductivity and large (colossal) magnetoresistances are two important electronic conducting phenomena found in transition metal oxides. High-Tc materials have applications such as superconducting magnets for MRI and NMR, and magnetoresistive materials may find use in magnetic sensors and spintronic devices. Here we report chemical doping studies of RuSr2(R2-xCex)Cu2O10-d ruthenocuprates which show that a single oxide system can be tuned between superconductivity at high hole dopings and varied magnetoresistive properties at low doping levels. A robust variation of negative magnetoresistance with hole concentration is found in the RuSr2R1.8-xY0.2CexCu2O10-d series, while RuSr2R1.1Ce0.9Cu2O10-d materials show an unprecedented crossover from negative to positive magnetoresistance with rare earth (R) ion radius.
[ { "version": "v1", "created": "Wed, 28 Nov 2007 22:12:53 GMT" } ]
2007-11-30T00:00:00
[ [ "Mclaughlin", "A. C.", "" ], [ "Begg", "L.", "" ], [ "Harrow", "C.", "" ], [ "Kimber", "S. A. J.", "" ], [ "Sher", "F.", "" ], [ "Attfield", "J. P.", "" ] ]
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711.4612
Sebastian Szybka
Sebastian J. Szybka, Tadeusz Chmaj
Fractal Threshold Behavior in Vacuum Gravitational Collapse
4 pages, 6 figures, minor changes
Phys.Rev.Lett.100:101102,2008
10.1103/PhysRevLett.100.101102
null
gr-qc
null
We present the numerical evidence for fractal threshold behavior in the five dimensional vacuum Einstein equations satisfying the cohomogeneity-two triaxial Bianchi type-IX ansatz. In other words, we show that a flip of the wings of a butterfly may influence the process of the black hole formation.
[ { "version": "v1", "created": "Wed, 28 Nov 2007 22:12:48 GMT" }, { "version": "v2", "created": "Wed, 2 Apr 2008 10:41:42 GMT" } ]
2008-11-26T00:00:00
[ [ "Szybka", "Sebastian J.", "" ], [ "Chmaj", "Tadeusz", "" ] ]
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711.4613
Grenville Croll
D. Price
Spreadsheet Risk - A New Direction for HMRC?
5 Pages
Proc. European Spreadsheet Risks Int. Grp. 2006 1-7 ISBN:1-905617-08-9
null
null
cs.CY
null
Her Majestys Revenue & Customs (HMRC) was born out of the need to create a UK tax authority by merging both the Inland Revenue and HM Customs & Excise into one department. HMRC encounters spreadsheets in tax-payers systems on a very regular basis as well as being a heavy user of spreadsheets internally. The approach to spreadsheet risk assessment and spreadsheet audit is by the use of trained computer auditors and data handlers. This, by definition, limits the use of our specialist spreadsheet audit tool to such trained staff. In order to tackle the growing use of spreadsheets, a new way of approaching the problem has been piloted. The aim is to issue all staff who come across spreadsheets with a simple to use analysis and risk assessment tool, based on the departmental software SpACE (Spreadsheet Audit & Compliance Examination).
[ { "version": "v1", "created": "Wed, 28 Nov 2007 22:15:53 GMT" } ]
2008-03-10T00:00:00
[ [ "Price", "D.", "" ] ]
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711.4614
Alikram Aliev
Alikram N. Aliev
Rotating Spacetimes with Asymptotic Non-Flat Structure and the Gyromagnetic Ratio
11 pages, twocolumn REVTeX; minor changes, references added; To the memory of Erdal Inonu
Phys.Rev.D77:044038,2008
10.1103/PhysRevD.77.044038
null
hep-th astro-ph gr-qc
null
In general relativity, the gyromagnetic ratio for all stationary, axisymmetric and asymptotically flat Einstein-Maxwell fields is known to be g=2. In this paper, we continue our previous works of examination this result for rotating charged spacetimes with asymptotic non-flat structure. We first consider two instructive examples of these spacetimes: The spacetime of a Kerr-Newman black hole with a straight cosmic string on its axis of symmetry and the Kerr-Newman Taub-NUT spacetime. We show that for both spacetimes the gyromagnetic ratio g=2 independent of their asymptotic structure. We also extend this result to a general class of metrics which admit separation of variables for the Hamilton-Jacobi and wave equations. We proceed with the study of the gyromagnetic ratio in higher dimensions by considering the general solution for rotating charged black holes in minimal five-dimensional gauged supergravity. We obtain the analytic expressions for two distinct gyromagnetic ratios of these black holes that are associated with their two independent rotation parameters. These expressions reveal the dependence of the gyromagnetic ratio on both the curvature radius of the AdS background and the parameters of the black holes: The mass, electric charge and two rotation parameters. We explore some special cases of interest and show that when the two rotation parameters are equal to each other and the rotation occurs at the maximum angular velocity, the gyromagnetic ratio g=4 regardless of the value of the electric charge. This agrees precisely with our earlier result obtained for general Kerr-AdS black holes with a test electric charge. We also show that in the BPS limit the gyromagnetic ratio for a supersymmetric black hole with equal rotation parameters ranges between 2 and 4.
[ { "version": "v1", "created": "Wed, 28 Nov 2007 22:26:22 GMT" }, { "version": "v2", "created": "Thu, 6 Mar 2008 10:01:48 GMT" } ]
2008-11-26T00:00:00
[ [ "Aliev", "Alikram N.", "" ] ]
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711.4615
Chang Soon Yong
S. Y. Chang
Equation of State and Phases of Polarized Unitary Fermi Gas
4 pages,4 figures
Phys. Rev. A 77, 051602 (R), 2008
10.1103/PhysRevA.77.051602
null
physics.atom-ph physics.atm-clus
null
The equation of state of the partially polarized two component Fermi gas at zero temperature in the unitary limit is computed by {\it ab initio} auxiliary field Monte Carlo method. We obtain the critical ratio of the chemical potentials $\mu_\downarrow/\mu_\uparrow$ at the phase transitions. The value of $\mu_\downarrow/\mu_\uparrow$ at the transition between the fully paired superfluid and the partially polarized phase is 0.11 while the critical value for the phase transition between the partially polarized phase and the fully polarized normal fluid is -0.59. We also determine the radial boundaries of the phase transitions of the Fermi gas in the harmonic trap as function of the total polarization. We find that beyond the critical polarization 0.65, the fully paired superfluid core disappears in the trapped Fermi gas.
[ { "version": "v1", "created": "Wed, 28 Nov 2007 22:46:17 GMT" }, { "version": "v2", "created": "Mon, 2 Jun 2008 20:40:34 GMT" } ]
2009-11-13T00:00:00
[ [ "Chang", "S. Y.", "" ] ]
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711.4616
Klaus Martin Pontoppidan
Klaus M. Pontoppidan, A. C. A. Boogert, Helen J. Fraser, Ewine F. van Dishoeck, Geoffrey A. Blake, Fred Lahuis, Karin I. Oberg, Neal J. Evans II, and Colette Salyk
The c2d Spitzer spectroscopic survey of ices around low-mass young stellar objects II: CO2
Accepted for ApJ
null
10.1086/533431
null
astro-ph
null
This paper presents Spitzer-IRS spectroscopy of the CO2 15.2 micron bending mode toward a sample of 50 embedded low-mass stars in nearby star-forming clouds, taken mostly from the ``Cores to Disks (c2d)'' Legacy program. The average abundance of solid CO2 relative to water in low-mass protostellar envelopes is 0.32 +/- 0.02, significantly higher than that found in quiescent molecular clouds and in massive star forming regions. It is found that a decomposition of all the observed CO2 bending mode profiles requires a minimum of five unique components. Roughly 2/3 of the CO2 ice is found in a water-rich environment, while most of the remaining 1/3 is found in a CO environment. Ground-based observations of solid CO toward a large subset of the c2d sample are used to further constrain the CO2:CO component and suggest a model in which low-density clouds form the CO2:H2O component and higher density clouds form the CO2:CO ice during and after the freeze-out of gas-phase CO. It is suggested that the subsequent evolution of the CO2 and CO profiles toward low-mass protostars, in particular the appearance of the splitting of the CO2 bending mode due to pure, crystalline CO2, is first caused by distillation of the CO2:CO component through evaporation of CO due to thermal processing to ~20-30 K in the inner regions of infalling envelopes. The formation of pure CO2 via segregation from the H2O rich mantle may contribute to the band splitting at higher levels of thermal processing (>50 K), but is harder to reconcile with the physical structure of protostellar envelopes around low-luminosity objects.
[ { "version": "v1", "created": "Wed, 28 Nov 2007 22:43:30 GMT" } ]
2009-11-13T00:00:00
[ [ "Pontoppidan", "Klaus M.", "" ], [ "Boogert", "A. C. A.", "" ], [ "Fraser", "Helen J.", "" ], [ "van Dishoeck", "Ewine F.", "" ], [ "Blake", "Geoffrey A.", "" ], [ "Lahuis", "Fred", "" ], [ "Oberg", "Karin I.", "" ], [ "Evans", "Neal J.", "II" ], [ "Salyk", "Colette", "" ] ]
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711.4617
C. Q. Geng
C.Q. Geng, S.H. Ho and J.N. Ng
Cosmological birefringence induced by neutrino current
8 pages, talk presented at ``Theory CANADA 3'', Edmonton, June 13 - 16, 2007
Can.J.Phys.86:587-590,2008
10.1139/P07-178
null
astro-ph
null
We review our recent work on the cosmological birefringence. We propose a new type of effective interactions in terms of the $CPT$-even dimension-six Chern-Simons-like term to generate the cosmological birefringence. We use the neutrino number asymmetry to induce a non-zero rotation polarization angle in the data of the cosmic microwave background radiation polarization.
[ { "version": "v1", "created": "Thu, 29 Nov 2007 18:53:01 GMT" } ]
2009-06-23T00:00:00
[ [ "Geng", "C. Q.", "" ], [ "Ho", "S. H.", "" ], [ "Ng", "J. N.", "" ] ]
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711.4618
Sergey Gevorkyan
S.R. Gevorkyan, A.N. Sissakian, A.V. Tarasov, H.T. Torosyan, O.O. Voskresenskaya
The electromagnetic effects in $K_{e4}$ decay
8 pages,1 figure
Phys.Atom.Nucl.73:937,2010
10.1134/S1063778810060049
null
hep-ph
null
The final state interaction of pions in $K_{e4}$ decay allows one to obtain the value of the isospin and angular momentum zero $\pi\pi$ scattering length $a_0^0$.We take into account the electromagnetic interaction of pions and isospin symmetry breaking effects caused by different masses of neutral and charged pions and estimate the impact of these effects on the procedure of scattering length extraction from $K_{e4}$ decay.
[ { "version": "v1", "created": "Wed, 28 Nov 2007 23:39:18 GMT" }, { "version": "v2", "created": "Thu, 6 Dec 2007 21:47:36 GMT" }, { "version": "v3", "created": "Fri, 16 May 2008 20:25:04 GMT" } ]
2011-04-07T00:00:00
[ [ "Gevorkyan", "S. R.", "" ], [ "Sissakian", "A. N.", "" ], [ "Tarasov", "A. V.", "" ], [ "Torosyan", "H. T.", "" ], [ "Voskresenskaya", "O. O.", "" ] ]
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711.4619
Adam Gamsa
Benjamin Doyon and Adam Gamsa
Integral equations and large-time asymptotics for finite-temperature Ising chain correlation functions
null
null
10.1088/1742-5468/2008/03/P03012
null
math-ph cond-mat.stat-mech hep-th math.MP
null
This work concerns the dynamical two-point spin correlation functions of the transverse Ising quantum chain at finite (non-zero) temperature, in the universal region near the quantum critical point. They are correlation functions of twist fields in the massive Majorana fermion quantum field theory. At finite temperature, these are known to satisfy a set of integrable partial differential equations, including the sinh-Gordon equation. We apply the classical inverse scattering method to study them, finding that the ``initial scattering data'' corresponding to the correlation functions are simply related to the one-particle finite-temperature form factors calculated recently by one of the authors. The set of linear integral equations (Gelfand-Levitan-Marchenko equations) associated to the inverse scattering problem then gives, in principle, the two-point functions at all space and time separations, and all temperatures. From them, we evaluate the large-time asymptotic expansion ``near the light cone'', in the region where the difference between the space and time separations is of the order of the correlation length.
[ { "version": "v1", "created": "Wed, 28 Nov 2007 23:16:45 GMT" } ]
2009-11-13T00:00:00
[ [ "Doyon", "Benjamin", "" ], [ "Gamsa", "Adam", "" ] ]
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711.462
Jose M. Martin-Garcia
Carsten Gundlach, Jose M. Martin-Garcia
Critical phenomena in gravitational collapse
51 pages, 5 figures. Major update of Living Rev. Rel. 2 (1999) 4
LivingRev.Rel.10:5,2007
10.12942/lrr-2007-5
null
gr-qc
null
As first discovered by Choptuik, the black hole threshold in the space of initial data for general relativity shows both surprising structure and surprising simplicity. Universality, power-law scaling of the black hole mass, and scale echoing have given rise to the term "critical phenomena". They are explained by the existence of exact solutions which are attractors within the black hole threshold, that is, attractors of codimension one in phase space, and which are typically self-similar. Critical phenomena give a natural route from smooth initial data to arbitrarily large curvatures visible from infinity, and are therefore likely to be relevant for cosmic censorship, quantum gravity, astrophysics, and our general understanding of the dynamics of general relativity.
[ { "version": "v1", "created": "Wed, 28 Nov 2007 23:27:15 GMT" } ]
2015-05-13T00:00:00
[ [ "Gundlach", "Carsten", "" ], [ "Martin-Garcia", "Jose M.", "" ] ]
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711.4621
Dan Hooper
Scott Dodelson, Dan Hooper and Pasquale D. Serpico
Extracting the Gamma Ray Signal from Dark Matter Annihilation in the Galactic Center Region
8 pages, 5 figures. Minor changes, note added. Matches published version
Phys.Rev.D77:063512,2008
10.1103/PhysRevD.77.063512
FERMILAB-PUB-07-632-A
astro-ph hep-ph
null
The GLAST satellite mission will study the gamma ray sky with considerably greater exposure than its predecessor EGRET. In addition, it will be capable of measuring the arrival directions of gamma rays with much greater precision. These features each significantly enhance GLAST's potential for identifying gamma rays produced in the annihilations of dark matter particles. The combined use of spectral and angular information, however, is essential if the full sensitivity of GLAST to dark matter is to be exploited. In this paper, we discuss the separation of dark matter annihilation products from astrophysical backgrounds, focusing on the Galactic Center region, and perform a forecast for such an analysis. We consider both point-like and diffuse astrophysical backgrounds and model them using a point-spread-function for GLAST. While the results of our study depend on the specific characteristics of the dark matter signal and astrophysical backgrounds, we find that in many scenarios it is possible to successfully identify dark matter annihilation radiation, even in the presence of significant astrophysical backgrounds.
[ { "version": "v1", "created": "Wed, 28 Nov 2007 23:31:49 GMT" }, { "version": "v2", "created": "Thu, 13 Mar 2008 15:30:21 GMT" } ]
2008-11-26T00:00:00
[ [ "Dodelson", "Scott", "" ], [ "Hooper", "Dan", "" ], [ "Serpico", "Pasquale D.", "" ] ]
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711.4622
Jarrett Johnson
Jarrett L. Johnson, Thomas H. Greif, Volker Bromm
Occurrence of Metal-free Galaxies in the Early Universe
13 pages, 5 figures; now accepted to MNRAS
null
10.1111/j.1365-2966.2008.13381.x
null
astro-ph
null
The character of the first galaxies at redshifts z > 10 strongly depends on their level of pre-enrichment, which is in turn determined by the rate of primordial star formation prior to their assembly. In order for the first galaxies to remain metal-free, star formation in minihaloes must be highly suppressed, most likely by H2-dissociating Lyman-Werner (LW) radiation. We show that the build-up of such a strong LW background is hindered by two effects. Firstly, the level of the LW background is self-regulated, being produced by the Population III (Pop III) star formation which it, in turn, suppresses. Secondly, the high opacity to LW photons which is built up in the relic H II regions left by the first stars acts to diminish the global LW background. Accounting for a self-regulated LW background, we estimate a lower limit for the rate of Pop III star formation in minihaloes at z > 15. Further, we simulate the formation of a 'first galaxy' with virial temperature T > 10^4 K and total mass > 10^8 M_Sun at z > 10, and find that complete suppression of previous Pop III star formation is unlikely, with stars of > 100 M_Sun (Pop III.1) and > 10 M_Sun (Pop III.2) likely forming. Finally, we discuss the implications of these results for the nature of the first galaxies, which may be observed by future missions such as the James Webb Space Telescope.
[ { "version": "v1", "created": "Wed, 28 Nov 2007 23:35:53 GMT" }, { "version": "v2", "created": "Wed, 23 Apr 2008 19:11:53 GMT" } ]
2009-11-13T00:00:00
[ [ "Johnson", "Jarrett L.", "" ], [ "Greif", "Thomas H.", "" ], [ "Bromm", "Volker", "" ] ]
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711.4623
Pavel Krtous
Artur Sergyeyev, Pavel Krtous
Complete Set of Commuting Symmetry Operators for the Klein-Gordon Equation in Generalized Higher-Dimensional Kerr-NUT-(A)dS Spacetimes
6 pages, no figures; typos in eq.(6) fixed; one reference added
Phys.Rev.D77:044033,2008
10.1103/PhysRevD.77.044033
null
hep-th gr-qc math-ph math.MP
null
We consider the Klein-Gordon equation in generalized higher-dimensional Kerr-NUT-(A)dS spacetime without imposing any restrictions on the functional parameters characterizing the metric. We establish commutativity of the second-order operators constructed from the Killing tensors found in arXiv:hep-th/0612029 and show that these operators, along with the first-order operators originating from the Killing vectors, form a complete set of commuting symmetry operators (i.e., integrals of motion) for the Klein-Gordon equation. Moreover, we demonstrate that the separated solutions of the Klein-Gordon equation obtained in arXiv:hep-th/0611245 are joint eigenfunctions for all of these operators. We also present explicit form of the zero mode for the Klein-Gordon equation with zero mass. In the semiclassical approximation we find that the separated solutions of the Hamilton-Jacobi equation for geodesic motion are also solutions for a set of Hamilton-Jacobi-type equations which correspond to the quadratic conserved quantities arising from the above Killing tensors.
[ { "version": "v1", "created": "Thu, 29 Nov 2007 00:37:40 GMT" }, { "version": "v2", "created": "Tue, 8 Jan 2008 23:49:06 GMT" } ]
2008-11-26T00:00:00
[ [ "Sergyeyev", "Artur", "" ], [ "Krtous", "Pavel", "" ] ]
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711.4624
Chongying Dong
W. Zhang and C. Dong
W-algebra W(2,2) and the vertex operator algebra L(1/2,0)\otimes L(1/2,0)
15 pages
null
null
null
math.QA math.RT
null
In this paper the W-algebra W(2,2) and its representation theory are studied. It is proved that a simple vertex operator algebra generated by two weight 2 vectors is either a vertex operator algebra associated to a highest irreducible W(2,2)-module or a tensor product of two irreducible Virasoro vertex operator algebras. Furthermore, any rational, C_2-cofinite simple vertex operator algebra whose weight 1 subspace is zero and weight 2 subspace is 2-dimensional, and with central charge c=1 is isomorphic to L(1/2,0)\otimes L(1/2,0).
[ { "version": "v1", "created": "Wed, 28 Nov 2007 23:42:00 GMT" } ]
2007-11-30T00:00:00
[ [ "Zhang", "W.", "" ], [ "Dong", "C.", "" ] ]
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711.4625
Chongying Dong
C. Dong and W. Zhang
Toward classfication of rational vertex operator algebras with central charges less than 1
9 pages
null
null
null
math.QA math.RT
null
The rational and C_2-cofinite simple vertex operator algebras whose effective central charges and the central charges c are equal and less than 1 are classified. Such a vertex operator algebra is zero if c<0 and C if c=0. If c>0, it is an extension of discrete Virasoro vertex operator algebra L(c_{p,q},0) by its irreducible modules. It is also proved that for any rational and C_2-cofinite simple vertex operator algebra whose effective central charge and central charge are equal, the vertex operator subalgebra generated by the Virasoro vector is simple.
[ { "version": "v1", "created": "Wed, 28 Nov 2007 23:52:01 GMT" } ]
2007-11-30T00:00:00
[ [ "Dong", "C.", "" ], [ "Zhang", "W.", "" ] ]
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711.4626
Erin Jollley Mrs
Erin J.D. Jolley and Zdenka Kuncic
Constraints on jet-driven disk accretion in Sagittarius A*
null
null
10.1086/527312
null
astro-ph
null
We revisit theoretical and observational constraints on geometrically-thin disk accretion in Sagittarius A* (Sgr A*). We show that the combined effects of mass outflows and electron energization in the hot part of the accretion flow can deflate the inflowing gas from a geometrically-thick structure. This allows the gas to cool and even thermalize on an inflow timescale. As a result, a compact, relatively cool disk may form at small radii. We show that magnetic coupling between the relativistic disk and a steady-state jet results in a disk that is less luminous than a standard relativistic disk accreting at the same rate. This relaxes the observational constraints on thin-disk accretion in Sgr A* (and by implication, other Low-Luminosity Active Galactic Nulcei, LLAGN). We find typical cold gas accretion rates of a few * 10^{-9} solar masses / yr. We also find that the predicted modified disk emission is compatible with existing near-infrared (NIR) observations of Sgr A* in its quiescent state provided that the disk inclination angle is > 87 degrees and that the jet extracts more than 75% of the accretion power.
[ { "version": "v1", "created": "Wed, 28 Nov 2007 23:53:56 GMT" } ]
2009-11-13T00:00:00
[ [ "Jolley", "Erin J. D.", "" ], [ "Kuncic", "Zdenka", "" ] ]
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711.4627
Said Sidki
Ricardo N. Oliveira, Said N. Sidki
On Commutativity and Finiteness in Groups
22 pages
null
null
null
math.GR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The second author introduced notions of weak permutability and commutativity between groups and proved the finiteness of a group generated by two weakly permutable finite groups. Two groups H,K weakly commute provided there exists a bijection f: H -> K which fixes the identity element and such that h commutes with its image h^f for all h in H. The present paper gives support to conjectures about the nilpotency of groups generated by two weakly commuting finite abelian groups H,K.
[ { "version": "v1", "created": "Thu, 29 Nov 2007 00:03:36 GMT" }, { "version": "v2", "created": "Thu, 13 Mar 2008 16:46:45 GMT" }, { "version": "v3", "created": "Sun, 28 Jun 2009 22:00:38 GMT" } ]
2009-06-29T00:00:00
[ [ "Oliveira", "Ricardo N.", "" ], [ "Sidki", "Said N.", "" ] ]
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711.4628
Noboru Nakanishi
Noboru Nakanishi
An Attempt to Remove Quadratic Divergences in the Standard Theory
6 pages
null
null
null
hep-th
null
The quadratic divergences caused by Yukawa interactions in the standard theory of elementary particle physics is shown to be removed by introducing finite-mass complex-ghost regulator fields. In this modification of the standard theory, its manifest covariance, renormalizability, gauge invariance and unitarity are retained, and no new observable particles are introduced.
[ { "version": "v1", "created": "Thu, 29 Nov 2007 00:12:40 GMT" } ]
2007-11-30T00:00:00
[ [ "Nakanishi", "Noboru", "" ] ]
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711.4629
Alan R. Denton
Alan R. Denton
Effective Interactions in Soft Materials
Chapter contributed to Nanostructured Soft Matter: Experiment, Theory, Simulation and Perspectives, edited by A. V. Zvelindovsky; 39 pages, 4 figures
Nanostructured Soft Matter: Experiment, Theory, Simulation and Perspectives, edited by A. V. Zvelindovsky, pp. 395-433 (Springer, Dordrecht, 2007)
10.1007/978-1-4020-6330-5_13
null
cond-mat.soft cond-mat.stat-mech
null
Soft materials, such as colloidal suspensions, polymer solutions, and biological systems, are typically multicomponent mixtures of macromolecules and simpler components (e.g., microions, monomers, solvent) that can assemble into complex structures spanning broad length and time scales. Many characteristic traits of soft matter, e.g., mechanical fragility, sensitivity to external influence, and tunable thermal and optical properties, emerge from a mingling of microscopic and mesoscopic constituents. Large asymmetries in size and charge between macromolecules and microscopic components often make impractical the explicit modeling of all degrees of freedom over physically significant length and time scales. The complexity often can be reduced, however, by pre-averaging (coarse-graining) the degrees of freedom of some microscopic components, thus mapping the real system onto a simpler model of fewer components, but governed by effective interparticle interactions. This chapter reviews the statistical mechanical foundations of effective interactions in soft materials and discusses illustrative applications to charged colloids, polyelectrolytes, and colloid-polymer mixtures
[ { "version": "v1", "created": "Thu, 29 Nov 2007 00:21:43 GMT" } ]
2015-05-13T00:00:00
[ [ "Denton", "Alan R.", "" ] ]
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711.463
James B. Hartle
James B. Hartle, S.W. Hawking, Thomas Hertog
The No-Boundary Measure of the Universe
4 pages, revtex4, minor corrections to accord with published version
Phys.Rev.Lett.100:201301,2008
10.1103/PhysRevLett.100.201301
null
hep-th astro-ph gr-qc
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We consider the no-boundary proposal for homogeneous isotropic closed universes with a cosmological constant and a scalar field with a quadratic potential. In the semi-classical limit, it predicts classical behavior at late times if the initial scalar field is more than a certain minimum. If the classical late time histories are extended back, they may be singular or bounce at a finite radius. The no-boundary proposal provides a probability measure on the classical solutions which selects inflationary histories but is heavily biased towards small amounts of inflation. This would not be compatible with observations. However we argue that the probability for a homogeneous universe should be multiplied by exp(3N) where N is the number of e-foldings of slow roll inflation to obtain the probability for what we observe in our past light cone. This volume weighting is similar to that in eternal inflation. In a landscape potential, it would predict that the universe would have a large amount of inflation and that it would start in an approximately de Sitter state near a saddle-point of the potential. The universe would then have always been in the semi-classical regime.
[ { "version": "v1", "created": "Thu, 29 Nov 2007 00:29:59 GMT" }, { "version": "v2", "created": "Thu, 13 Dec 2007 23:54:27 GMT" }, { "version": "v3", "created": "Wed, 6 Feb 2008 22:23:45 GMT" }, { "version": "v4", "created": "Sun, 8 Jun 2008 18:33:41 GMT" } ]
2008-11-26T00:00:00
[ [ "Hartle", "James B.", "" ], [ "Hawking", "S. W.", "" ], [ "Hertog", "Thomas", "" ] ]
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711.4631
Lijian Zhang
Lijian Zhang, Christine Silberhorn, Ian A. Walmsley
On Secure Quantum Key Distribution Using Continuous Variables of Single Photons
5 pages, 2 figures
null
10.1103/PhysRevLett.100.110504
null
quant-ph
null
We analyse the distribution of secure keys using quantum cryptography based on the continuous variable degree of freedom of entangled photon pairs. We derive the information capacity of a scheme based on the spatial entanglement of photons from a realistic source, and show that the standard measures of security known for quadrature-based continuous variable quantum cryptography (CV-QKD) are inadequate. A specific simple eavesdropping attack is analysed to illuminate how secret information may be distilled well beyond the bounds of the usual CV-QKD measures.
[ { "version": "v1", "created": "Thu, 29 Nov 2007 00:32:46 GMT" } ]
2009-11-13T00:00:00
[ [ "Zhang", "Lijian", "" ], [ "Silberhorn", "Christine", "" ], [ "Walmsley", "Ian A.", "" ] ]
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711.4632
Dmitry Sergeevich Petrov
B. Marcelis, S.J.J.M.F. Kokkelmans, G.V. Shlyapnikov, D.S. Petrov
Collisional properties of weakly bound heteronuclear dimers
14 pages, 4 figures, published version
Phys. Rev. A 77, 032707 (2008)
10.1103/PhysRevA.77.032707
null
cond-mat.stat-mech
null
We consider collisional properties of weakly bound heteronuclear molecules (dimers) formed in a two-species mixture of atoms with a large mass difference. We focus on dimers containing light fermionic atoms as they manifest collisional stability due to an effective dimer-dimer repulsion originating from the exchange of the light atoms. In order to solve the dimer-dimer scattering problem we develop a theoretical approach, which provides a physically transparent and quantitative description of this four-atom system in terms of three- and two-body observables. We calculate the elastic scattering amplitude and the rates of inelastic processes such as the trimer formation and the relaxation of dimers into deeply bound molecular states. Irrespective of whether the heavy atoms are bosons or fermions, the inelastic rate can be significantly lower than the rate of elastic collisions. Moreover, the measurement of the inelastic rate which is a four-body observable, can be an efficient and precise tool for determining three-body observables such as the three-body parameter, positions of Efimov states and their lifetimes.
[ { "version": "v1", "created": "Thu, 29 Nov 2007 00:41:18 GMT" }, { "version": "v2", "created": "Sat, 15 Mar 2008 15:04:27 GMT" } ]
2008-03-15T00:00:00
[ [ "Marcelis", "B.", "" ], [ "Kokkelmans", "S. J. J. M. F.", "" ], [ "Shlyapnikov", "G. V.", "" ], [ "Petrov", "D. S.", "" ] ]
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711.4633
Peter Foldi
Peter Foldi, Mihaly G. Benedict, F. M. Peeters
Dynamics of periodic anticrossings: Decoherence, pointer states and hysteresis curves
10 pages, 9 slightly reduced quality figures, submitted to PRA; More details concerning applications to molacular nanomagnets are given
Phys. Rev. A 77, 013406 (2008)
10.1103/PhysRevA.77.013406
null
quant-ph cond-mat.mes-hall
null
We consider a strongly driven two-level (spin) system, with a periodic external field that induces a sequence of avoided level crossings. The spin system interacts with a bosonic reservoir which leads to decoherence. A Markovian dynamical equation is introduced without relying on the rotating wave approximation in the system-external field interaction. We show that the time evolution of the two-level system is directed towards an incoherent sum of periodic Floquet states regardless of the initial state and even the type of the coupling to the environment. Analyzing the time scale of approaching these time-dependent pointer states, information can be deduced concerning the nature and strength of the system-environment coupling. The inversion as a function of the external field is usually multi-valued, and the form of these hysteresis curves is qualitatively different for low and high temperatures. For moderate temperatures we found that the series of Landau-Zener-St\"{u}ckelberg-type transitions still can be used for state preparation, regardless of the decoherence rate. Possible applications include quantum information processing and molecular nanomagnets.
[ { "version": "v1", "created": "Thu, 29 Nov 2007 00:41:52 GMT" }, { "version": "v2", "created": "Tue, 5 Feb 2008 15:18:25 GMT" } ]
2008-02-05T00:00:00
[ [ "Foldi", "Peter", "" ], [ "Benedict", "Mihaly G.", "" ], [ "Peeters", "F. M.", "" ] ]
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711.4634
Grenville Croll
Brandon Weber
Strategies for Addressing Spreadsheet Compliance Challenges
16 pages including web links and references
Proc. European Spreadsheet Risks Int. Grp. 2006 17-32 ISBN:1-905617-08-09
null
null
cs.CY
null
Most organizations today use spreadsheets in some form or another to support critical business processes. However the financial resources, and developmental rigor dedicated to them are often minor in comparison to other enterprise technology. The increasing focus on achieving regulatory and other forms of compliance over key technology assets has made it clear that organizations must regard spreadsheets as an enterprise resource and account for them when developing an overall compliance strategy. This paper provides the reader with a set of practical strategies for addressing spreadsheet compliance from an organizational perspective. It then presents capabilities offered in the 2007 Microsoft Office System which can be used to help customers address compliance challenges.
[ { "version": "v1", "created": "Thu, 29 Nov 2007 00:51:28 GMT" } ]
2008-03-13T00:00:00
[ [ "Weber", "Brandon", "" ] ]
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711.4635
Aleksander Zujev
A. Zujev, A. Baldwin, R. T. Scalettar, V. G. Rousseau, P. J. H. Denteneer, M. Rigol
Superfluid and Mott Insulator phases of one-dimensional Bose-Fermi mixtures
8 pages, 12 figures
Phys. Rev. A 78, 033619 (2008)
10.1103/PhysRevA.78.033619
null
cond-mat.stat-mech
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study the ground state phases of Bose-Fermi mixtures in one-dimensional optical lattices with quantum Monte Carlo simulations using the Canonical Worm algorithm. Depending on the filling of bosons and fermions, and the on-site intra- and inter-species interaction, different kinds of incompressible and superfluid phases appear. On the compressible side, correlations between bosons and fermions can lead to a distinctive behavior of the bosonic superfluid density and the fermionic stiffness, as well as of the equal-time Green functions, which allow one to identify regions where the two species exhibit anticorrelated flow. We present here complete phase diagrams for these systems at different fillings and as a function of the interaction parameters.
[ { "version": "v1", "created": "Thu, 29 Nov 2007 20:32:17 GMT" }, { "version": "v2", "created": "Sat, 27 Sep 2008 20:35:08 GMT" } ]
2008-09-27T00:00:00
[ [ "Zujev", "A.", "" ], [ "Baldwin", "A.", "" ], [ "Scalettar", "R. T.", "" ], [ "Rousseau", "V. G.", "" ], [ "Denteneer", "P. J. H.", "" ], [ "Rigol", "M.", "" ] ]
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711.4636
Asimina Arvanitaki
Asimina Arvanitaki, Savas Dimopoulos, Andrew A. Geraci, Jason Hogan, and Mark Kasevich
Testing Atom and Neutron Neutrality with Atom Interferometry
4 pages, 2 figures, to be submitted for publication in PRL
Phys.Rev.Lett.100:120407,2008
10.1103/PhysRevLett.100.120407
null
hep-ph hep-ex hep-th physics.atom-ph
null
We propose an atom-interferometry experiment based on the scalar Aharonov-Bohm effect which detects an atom charge at the 10^{-28}e level, and improves the current laboratory limits by 8 orders of magnitude. This setup independently probes neutron charges down to 10^{-28}e, 7 orders of magnitude below current bounds.
[ { "version": "v1", "created": "Thu, 29 Nov 2007 00:57:33 GMT" } ]
2008-11-26T00:00:00
[ [ "Arvanitaki", "Asimina", "" ], [ "Dimopoulos", "Savas", "" ], [ "Geraci", "Andrew A.", "" ], [ "Hogan", "Jason", "" ], [ "Kasevich", "Mark", "" ] ]
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711.4637
Ji-Feng Yang
J.-F. Yang (ECNU)
A nonperturbative parametrization and scenario for EFT renormalization
5 pages, no figure, to appear in Europhys. Lett
Europhys. Lett. 85 (2009) 51003
10.1209/0295-5075/85/51003
null
nucl-th hep-ph hep-th
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We present a universal form of the $T$-matrices renormalized in nonperturbative regime and the ensuing notions and properties that fail conventional wisdoms. A universal scale is identified and shown to be renormalization group invariant. The effective range parameters are derived in a nonperturbative scenario with some new predictions within the realm of contact potentials. Some controversies are shown to be due to the failure of conventional wisdoms.
[ { "version": "v1", "created": "Thu, 29 Nov 2007 01:22:39 GMT" }, { "version": "v2", "created": "Mon, 3 Dec 2007 01:58:43 GMT" }, { "version": "v3", "created": "Sun, 6 Jan 2008 13:24:00 GMT" }, { "version": "v4", "created": "Sat, 15 Nov 2008 02:02:03 GMT" }, { "version": "v5", "created": "Fri, 16 Jan 2009 03:17:10 GMT" }, { "version": "v6", "created": "Thu, 12 Mar 2009 12:52:50 GMT" } ]
2009-03-17T00:00:00
[ [ "Yang", "J. -F.", "", "ECNU" ] ]
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711.4638
Hidetoshi Katori
H. Hachisu, K. Miyagishi, S.G. Porsev, A. Derevianko, V. D. Ovsiannikov, V. G. Pal'chikov, M. Takamoto, H. Katori
Trapping of Neutral Mercury Atoms and Prospects for Optical Lattice Clocks
4 pages, 3 figures
null
10.1103/PhysRevLett.100.053001
null
physics.atom-ph
null
We report a vapor-cell magneto-optical trapping of Hg isotopes on the ${}^1S_0-{}^3P_1$ intercombination transition. Six abundant isotopes, including four bosons and two fermions, were trapped. Hg is the heaviest non-radioactive atom trapped so far, which enables sensitive atomic searches for ``new physics'' beyond the standard model. We propose an accurate optical lattice clock based on Hg and evaluate its systematic accuracy to be better than $10^{-18}$. Highly accurate and stable Hg-based clocks will provide a new avenue for the research of optical lattice clocks and the time variation of the fine-structure constant.
[ { "version": "v1", "created": "Thu, 29 Nov 2007 01:21:42 GMT" } ]
2009-11-13T00:00:00
[ [ "Hachisu", "H.", "" ], [ "Miyagishi", "K.", "" ], [ "Porsev", "S. G.", "" ], [ "Derevianko", "A.", "" ], [ "Ovsiannikov", "V. D.", "" ], [ "Pal'chikov", "V. G.", "" ], [ "Takamoto", "M.", "" ], [ "Katori", "H.", "" ] ]
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711.4639
Robert Shrock
Victor Matveev and Robert Shrock
On Properties of the Ising Model for Complex Energy/Temperature and Magnetic Field
17 pages, 9 figures
J. Phys. A 41, 135002 (2008)
10.1088/1751-8113/41/13/135002
null
cond-mat.stat-mech
null
We study some properties of the Ising model in the plane of the complex (energy/temperature)-dependent variable $u=e^{-4K}$, where $K=J/(k_BT)$, for nonzero external magnetic field, $H$. Exact results are given for the phase diagram in the $u$ plane for the model in one dimension and on infinite-length quasi-one-dimensional strips. In the case of real $h=H/(k_BT)$, these results provide new insights into features of our earlier study of this case. We also consider complex $h=H/(k_BT)$ and $\mu=e^{-2h}$. Calculations of complex-$u$ zeros of the partition function on sections of the square lattice are presented. For the case of imaginary $h$, i.e., $\mu=e^{i\theta}$, we use exact results for the quasi-1D strips together with these partition function zeros for the model in 2D to infer some properties of the resultant phase diagram in the $u$ plane. We find that in this case, the phase boundary ${\cal B}_u$ contains a real line segment extending through part of the physical ferromagnetic interval $0 \le u \le 1$, with a right-hand endpoint $u_{rhe}$ at the temperature for which the Yang-Lee edge singularity occurs at $\mu=e^{\pm i\theta}$. Conformal field theory arguments are used to relate the singularities at $u_{rhe}$ and the Yang-Lee edge.
[ { "version": "v1", "created": "Thu, 29 Nov 2007 01:37:02 GMT" } ]
2009-11-13T00:00:00
[ [ "Matveev", "Victor", "" ], [ "Shrock", "Robert", "" ] ]
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711.464
Benjamin Piot A
C.R. Dean, B.A. Piot, L.N. Pfeiffer, K.W.West, and G. Gervais
Resistively Detected NMR in Quantum Hall States: Investigation of the anomalous lineshape near $\nu=1$
5 pages, 3 figures, EP2DS 17, to be published in Physica E
null
10.1016/j.physe.2007.08.101
null
cond-mat.mes-hall
null
A study of the resistively detected nuclear magnetic resonance (RDNMR) lineshape in the vicinity of $\nu=1$ was performed on a high-mobility 2D electron gas formed in GaAs/AlGaAs. In higher Landau levels, application of an RF field at the nuclear magnetic resonance frequency coincides with an observed minimum in the longitudinal resistance, as predicted by the simple hyperfine interaction picture. Near $\nu=1$ however, an anomalous dispersive lineshape is observed where a resistance peak follows the usual minimum. In an effort to understand the origin of this anomalous peak we have studied the resonance under various RF and sample conditions. Interestingly, we show that the lineshape can be completely inverted by simply applying a DC current. We interpret this as evidence that the minima and maxima in the lineshape originate from two distinct mechanisms.
[ { "version": "v1", "created": "Thu, 29 Nov 2007 01:46:03 GMT" } ]
2009-11-13T00:00:00
[ [ "Dean", "C. R.", "" ], [ "Piot", "B. A.", "" ], [ "Pfeiffer", "L. N.", "" ], [ "West", "K. W.", "" ], [ "Gervais", "G.", "" ] ]
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711.4641
Daniele Colosi
Daniele Colosi
Relational evolution of a simple quantum Hamiltonian model
9 pages, LaTex + revtex4
null
null
null
quant-ph
null
We study the quantum dynamics of a time reparametrization invariant system with a vanishing Hamiltonian. The evolution of the physical degrees of freedom of the system is described, both at the classical and at the quantum level, in relational terms by the construction of an internal time parameter. We use the Pegg-Barnett phase operator formalism in finite dimensional Hilbert space as an essential ingredient.
[ { "version": "v1", "created": "Thu, 29 Nov 2007 19:36:01 GMT" } ]
2007-11-30T00:00:00
[ [ "Colosi", "Daniele", "" ] ]
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711.4642
Carlos Pineda
Carlos Pineda
One, Two, and $n$ Qubit Decoherence
PhD thesis, Universidad Nacional Autonoma de Mexico. Compiled with pdflatex, 146 pages. All the content only in english but alternate cover and abstract also available in spanish
null
null
null
quant-ph
null
We study decoherence of one, two, and $n$ non-interacting qubits. Decoherence, measured in terms of purity, is calculated in linear response approximation, making use of the spectator configuration. The environment and its interaction with the qubits are modelled by random matrices. For two qubits, numerical studies reveal a simple one to one correspondence between its decoherence and its internal entanglement decay. Using this relation we are able to give a formula for concurrence decay. For large environments the evolution induces a unital channel in the two qubits, providing a partial explanation for the relation above. Using a kicked Ising spin network, we study the exact evolution of two non-interacting qubits in the presence of a spin bath. We find that the entanglement (as measured by concurrence) of the two qubits has a close relation to the purity of the pair, and closely follows an analytic relation derived for Werner states. As a collateral result we find that an integrable environment causes quadratic decay of concurrence as well as of purity, while a chaotic environment causes linear decay. Both quantities display recurrences in some integrable environments. Good agreement with the results found using random matrix theory is obtained. Finally, we analyze decoherence of a quantum register in the absence of non-local operations. The problem is solved in terms of a sum rule which implies linear scaling in the number of qubits. Each term involves a single qubit and its entanglement with the remaining ones. Two conditions are essential: decoherence must be small and the coupling of different qubits must be uncorrelated in the interaction picture. We apply the result to the random matrix model, and illustrate its reach considering a GHZ state coupled to a spin bath.
[ { "version": "v1", "created": "Thu, 29 Nov 2007 03:03:18 GMT" } ]
2007-11-30T00:00:00
[ [ "Pineda", "Carlos", "" ] ]
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711.4643
Hong Mao
Hong Mao, Minjie Yao, Wei-Qin Zhao
The Friedberg-Lee model at finite temperature and density
12 pages, 11 figures; version accepted for publication in Phys. Rev. C
Phys.Rev.C77:065205,2008
10.1103/PhysRevC.77.065205
null
hep-ph nucl-th
null
The Friedberg-Lee model is studied at finite temperature and density. By using the finite temperature field theory, the effective potential of the Friedberg-Lee model and the bag constant $B(T)$ and $B(T,\mu)$ have been calculated at different temperatures and densities. It is shown that there is a critical temperature $T_{C}\simeq 106.6 \mathrm{MeV}$ when $\mu=0 \mathrm{MeV}$ and a critical chemical potential $\mu \simeq 223.1 \mathrm{MeV}$ for fixing the temperature at $T=50 \mathrm{MeV}$. We also calculate the soliton solutions of the Friedberg-Lee model at finite temperature and density. It turns out that when $T\leq T_{C}$ (or $\mu \leq \mu_C$), there is a bag constant $B(T)$ (or $B(T,\mu)$) and the soliton solutions are stable. However, when $T>T_{C}$ (or $\mu>\mu_C$) the bag constant $B(T)=0 \mathrm{MeV}$ (or $B(T,\mu)=0 \mathrm{MeV}$) and there is no soliton solution anymore, therefore, the confinement of quarks disappears quickly.
[ { "version": "v1", "created": "Thu, 29 Nov 2007 02:46:46 GMT" }, { "version": "v2", "created": "Tue, 20 May 2008 02:41:48 GMT" } ]
2008-11-26T00:00:00
[ [ "Mao", "Hong", "" ], [ "Yao", "Minjie", "" ], [ "Zhao", "Wei-Qin", "" ] ]
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711.4644
Steve Drasco
Steve Drasco
Verifying black hole orbits with gravitational spectroscopy
18 pages, expanded section on detection algorithms and made minor edits. Final published version
Phys.Rev.D79:104016,2009
10.1103/PhysRevD.79.104016
null
gr-qc astro-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Gravitational waves from test masses bound to geodesic orbits of rotating black holes are simulated, using Teukolsky's black hole perturbation formalism, for about ten thousand generic orbital configurations. Each binary radiates power exclusively in modes with frequencies that are integer-linear-combinations of the orbit's three fundamental frequencies. The following general spectral properties are found with a survey of orbits: (i) 99% of the radiated power is typically carried by a few hundred modes, and at most by about a thousand modes, (ii) the dominant frequencies can be grouped into a small number of families defined by fixing two of the three integer frequency multipliers, and (iii) the specifics of these trends can be qualitatively inferred from the geometry of the orbit under consideration. Detections using triperiodic analytic templates modeled on these general properties would constitute a verification of radiation from an adiabatic sequence of black hole orbits and would recover the evolution of the fundamental orbital frequencies. In an analogy with ordinary spectroscopy, this would compare to observing the Bohr model's atomic hydrogen spectrum without being able to rule out alternative atomic theories or nuclei. The suitability of such a detection technique is demonstrated using snapshots computed at 12-hour intervals throughout the last three years before merger of a kludged inspiral. Because of circularization, the number of excited modes decreases as the binary evolves. A hypothetical detection algorithm that tracks mode families dominating the first 12 hours of the inspiral would capture 98% of the total power over the remaining three years.
[ { "version": "v1", "created": "Thu, 29 Nov 2007 02:48:55 GMT" }, { "version": "v2", "created": "Fri, 8 May 2009 04:51:14 GMT" } ]
2009-07-30T00:00:00
[ [ "Drasco", "Steve", "" ] ]
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711.4645
Xianhui Zhong
Xian-Hui Zhong and Qiang Zhao
Charmed baryon strong decays in a chiral quark model
22 pages, 16 tables; typos corrected;version to appear in PRD
Phys.Rev.D77:074008,2008
10.1103/PhysRevD.77.074008
null
hep-ph hep-ex
null
Charmed baryon strong decays are studied in a chiral quark model. The data for the decays of $\Lambda^+_c(2593)$, $\Lambda^+_c(2625)$, $\Sigma^{++,+,0}_c$ and $\Sigma^{+,0}_c(2520)$, are accounted for successfully, which allows to fix the pseudoscalar-meson-quark couplings in an effective chiral Lagrangian. Extending this framework to analyze the strong decays of the newly observed charmed baryons, we classify that both $\Lambda_c(2880)$ and $\Lambda_c(2940)$ are $D$-wave states in the N=2 shell; $\Lambda_c(2880)$ could be $|\Lambda_c ^2 D_{\lambda\lambda}{3/2}^+>$ and $\Lambda_c(2940)$ could be $|\Lambda_c ^2 D_{\lambda\lambda}{5/2}^+>$. Our calculation also suggests that $\Lambda_c(2765)$ is very likely a $\rho$-mode $P$-wave excited state in the N=1 shell, and favors a $|\Lambda_c ^4P_\rho 1/2^->$ configuration. The $\Sigma_c(2800)$ favors being a $|\Sigma_c ^2P_\lambda{1/2}^->$ state. But its being $|\Sigma^{++}_c ^4 P_\lambda{5/2}^->$ cannot be ruled out.
[ { "version": "v1", "created": "Thu, 29 Nov 2007 03:05:28 GMT" }, { "version": "v2", "created": "Fri, 7 Mar 2008 01:53:35 GMT" } ]
2008-11-26T00:00:00
[ [ "Zhong", "Xian-Hui", "" ], [ "Zhao", "Qiang", "" ] ]
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711.4646
Alexander Kusenko
Kalliopi Petraki and Alexander Kusenko
Dark-matter sterile neutrinos in models with a gauge singlet in the Higgs sector
12 pages, 7 figures
Phys.Rev.D77:065014,2008
10.1103/PhysRevD.77.065014
UCLA/07/TEP/27
hep-ph astro-ph
null
Sterile neutrino with mass of several keV can be the cosmological dark matter, can explain the observed velocities of pulsars, and can play an important role in the formation of the first stars. We describe the production of sterile neutrinos in a model with an extended Higgs sector, in which the Majorana mass term is generated by the vacuum expectation value of a gauge-singlet Higgs boson. In this model the relic abundance of sterile neutrinos does not necessarily depend on their mixing angles, the free-streaming length can be much smaller than in the case of warm dark matter produced by neutrino oscillations, and, therefore, some of the previously quoted bounds do not apply. The presence of the gauge singlet in the Higgs sector has important implications for the electroweak phase transition, baryogenesis, and the upcoming experiments at the Large Hadron Collider and a Linear Collider.
[ { "version": "v1", "created": "Thu, 29 Nov 2007 20:13:52 GMT" }, { "version": "v2", "created": "Tue, 11 Dec 2007 23:53:50 GMT" }, { "version": "v3", "created": "Wed, 5 Mar 2008 21:07:49 GMT" } ]
2008-11-26T00:00:00
[ [ "Petraki", "Kalliopi", "" ], [ "Kusenko", "Alexander", "" ] ]
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711.4647
Peter Ebenfelt
M. S. Baouendi, P. Ebenfelt, X. Huang
Super-rigidity for CR embeddings of real hypersurfaces into hyperquadrics
null
null
null
null
math.CV math.DG
null
Let $Q^N_l\subset \bC\bP^{N+1}$ denote the standard real, nondegenerate hyperquadric of signature $l$ and $M\subset \bC^{n+1}$ a real, Levi nondegenerate hypersurface of the same signature $l$. We shall assume that there is a holomorphic mapping $H_0\colon U\to \bC\bP^{N_0+1}$, where $U$ is some neighborhood of $M$ in $\bC^{n+1}$, such that $H_0(M)\subset Q^{N_0}_l$ but $H(U)\not\subset Q^{N_0}_l$. We show that if $N_0-n<l$ then, for any $N\geq N_0$, any holomorphic mapping $H\colon U\to \bC\bP^{N+1}$ with $H(M)\subset Q^{N}_l$ and $H(U)\not\subset Q^{N_0}_l$ must be the standard linear embedding of $Q^{N_0}_l$ into $Q^N_l$ up to conjugation by automorphisms of $Q^{N_0}_l$ and $Q^N_l$.
[ { "version": "v1", "created": "Thu, 29 Nov 2007 03:38:22 GMT" } ]
2007-11-30T00:00:00
[ [ "Baouendi", "M. S.", "" ], [ "Ebenfelt", "P.", "" ], [ "Huang", "X.", "" ] ]
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711.4648
Alexander Isaev
A. V. Isaev
A Remark on a Theorem by Kodama and Shimizu
6 pages
null
null
null
math.CV
null
We prove a characterization theorem for the unit polydisc $\Delta^n\subset\CC^n$ in the spirit of a recent result due to Kodama and Shimizu. We show that if $M$ is a connected $n$-dimensional complex manifold such that (i) the group $\hbox{Aut}(M)$ of holomorphic automorphisms of $M$ acts on $M$ with compact isotropy subgroups, and (ii) $\hbox{Aut}(M)$ and $\hbox{Aut}(\Delta^n)$ are isomorphic as topological groups equipped with the compact-open topology, then $M$ is holomorphically equivalent to $\Delta^n$.
[ { "version": "v1", "created": "Thu, 29 Nov 2007 03:41:22 GMT" }, { "version": "v2", "created": "Sun, 23 Mar 2008 22:26:08 GMT" } ]
2008-03-24T00:00:00
[ [ "Isaev", "A. V.", "" ] ]
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711.4649
Giambattista Giacomin
Giambattista Giacomin, Hubert Lacoin and Fabio Lucio Toninelli
Hierarchical pinning models, quadratic maps and quenched disorder
26 pages, 2 figures. v3: Theorem 1.6 improved. To appear on Probab. Theory Rel. Fields
Probab. Theory Rel. Fields 147, 185-216 (2010)
10.1007/s00440-009-0205-y
null
math.PR math-ph math.MP
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We consider a hierarchical model of polymer pinning in presence of quenched disorder, introduced by B. Derrida, V. Hakim and J. Vannimenius in 1992, which can be re-interpreted as an infinite dimensional dynamical system with random initial condition (the disorder). It is defined through a recurrence relation for the law of a random variable {R_n}_{n=1,2,...}, which in absence of disorder (i.e., when the initial condition is degenerate) reduces to a particular case of the well-known Logistic Map. The large-n limit of the sequence of random variables 2^{-n} log R_n, a non-random quantity which is naturally interpreted as a free energy, plays a central role in our analysis. The model depends on a parameter alpha>0, related to the geometry of the hierarchical lattice, and has a phase transition in the sense that the free energy is positive if the expectation of R_0 is larger than a certain threshold value, and it is zero otherwise. It was conjectured by Derrida et al. (1992) that disorder is relevant (respectively, irrelevant or marginally relevant) if 1/2<alpha<1 (respectively, alpha<1/2 or alpha=1/2), in the sense that an arbitrarily small amount of randomness in the initial condition modifies the critical point with respect to that of the pure (i.e., non-disordered) model if alpha is larger or equal to 1/2, but not if alpha is smaller than 1/2. Our main result is a proof of these conjectures for the case alpha different from 1/2. We emphasize that for alpha>1/2 we find the correct scaling form (for weak disorder) of the critical point shift.
[ { "version": "v1", "created": "Thu, 29 Nov 2007 03:55:41 GMT" }, { "version": "v2", "created": "Thu, 20 Dec 2007 14:32:37 GMT" }, { "version": "v3", "created": "Sat, 7 Feb 2009 07:11:42 GMT" } ]
2010-07-23T00:00:00
[ [ "Giacomin", "Giambattista", "" ], [ "Lacoin", "Hubert", "" ], [ "Toninelli", "Fabio Lucio", "" ] ]
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711.465
Noson S. Yanofsky
Adam Brandenburger, Noson Yanofsky
A Classification of Hidden-Variable Properties
28 pages; added references; clearer exposition. Final version
J. Phys. A: Math. Theor. 41 (2008) 425302
10.1088/1751-8113/41/42/425302
null
quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Hidden variables are extra components added to try to banish counterintuitive features of quantum mechanics. We start with a quantum-mechanical model and describe various properties that can be asked of a hidden-variable model. We present six such properties and a Venn diagram of how they are related. With two existence theorems and three no-go theorems (EPR, Bell, and Kochen-Specker), we show which properties of empirically equivalent hidden-variable models are possible and which are not. Formally, our treatment relies only on classical probability models, and physical phenomena are used only to motivate which models to choose.
[ { "version": "v1", "created": "Thu, 29 Nov 2007 03:57:21 GMT" }, { "version": "v2", "created": "Wed, 20 Aug 2008 04:36:15 GMT" }, { "version": "v3", "created": "Wed, 3 Dec 2008 16:57:36 GMT" } ]
2008-12-03T00:00:00
[ [ "Brandenburger", "Adam", "" ], [ "Yanofsky", "Noson", "" ] ]
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711.4651
Huan-Qiang Zhou
Huan-Qiang Zhou, Jian-Hui Zhao, Hong-Lei Wang, and Bo Li
Singularities in fidelity surfaces for quantum phase transitions: a geometric perspective
4+ pages, 3 figures
null
null
null
cond-mat.stat-mech cond-mat.str-el
null
The fidelity per site between two ground states of a quantum lattice system corresponding to different values of the control parameter defines a surface embedded in a Euclidean space. The Gaussian curvature naturally quantifies quantum fluctuations that destroy orders at transition points. It turns out that quantum fluctuations wildly distort the fidelity surface near the transition points, at which the Gaussian curvature is singular in the thermodynamic limit. As a concrete example, the one-dimensional quantum Ising model in a transverse field is analyzed. We also perform a finite size scaling analysis for the transverse Ising model of finite sizes. The scaling behavior for the Gaussian curvature is numerically checked and the correlation length critical exponent is extracted, which is consistent with the conformal invariance at the critical point.
[ { "version": "v1", "created": "Thu, 29 Nov 2007 06:30:25 GMT" } ]
2007-11-30T00:00:00
[ [ "Zhou", "Huan-Qiang", "" ], [ "Zhao", "Jian-Hui", "" ], [ "Wang", "Hong-Lei", "" ], [ "Li", "Bo", "" ] ]
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711.4652
Andrew Steiner
Andrew W. Steiner, Bao-An Li, Madappa Prakash
Ramifications of the Nuclear Symmetry Energy for Neutron Stars, Nuclei, and Heavy-Ion Collisions
8 pages, to appear in the proceedings of the International Symposium on Exotic States of Nuclear Matter (EXOCT 2007), Catania, Italy, 11-15 Jun 2007
null
10.1142/9789812797049_0008
null
nucl-th
null
The pervasive role of the nuclear symmetry energy in establishing some nuclear static and dynamical properties, and in governing some attributes of neutron star properties is highlighted.
[ { "version": "v1", "created": "Thu, 29 Nov 2007 04:39:21 GMT" } ]
2017-08-23T00:00:00
[ [ "Steiner", "Andrew W.", "" ], [ "Li", "Bao-An", "" ], [ "Prakash", "Madappa", "" ] ]
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711.4653
Kenichi Arai
Kazuyuki Yoshimura and Kenichi Arai
Phase reduction of stochastic limit cycle oscillators
4 pages, 2 figures
null
10.1103/PhysRevLett.101.154101
null
nlin.AO
null
We point out that the phase reduction of stochastic limit cycle oscillators has been done incorrectly in the literature. We present a correct phase reduction method for oscillators driven by weak external white Gaussian noises. Numerical evidence demonstrates that the present phase equation properly approximates the dynamics of the original full oscillator system.
[ { "version": "v1", "created": "Thu, 29 Nov 2007 04:56:43 GMT" } ]
2009-11-13T00:00:00
[ [ "Yoshimura", "Kazuyuki", "" ], [ "Arai", "Kenichi", "" ] ]
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711.4654
Yoichi Ando
Yoichi Ando (Osaka Univ.)
Comment on "Onset of Boson Mode at the Superconducting Critical Point of Underdoped YBa2Cu3Oy"
Accepted for publication in Phys. Rev. Lett
Phys. Rev. Lett. 100, 029701 (2008)
10.1103/PhysRevLett.100.029701
null
cond-mat.supr-con cond-mat.str-el
null
In a recent Letter [Phys. Rev. Lett. 97, 207001 (2006)], Doiron-Leyraud et al. reported a study of low-temperature thermal conductivity of underdoped YBa2Cu3Oy across the superconductor-insulator boundary and argued for a novel bosonic mode as well as charge-neutral fermions. In this Comment, we show that both of these claims are dubious.
[ { "version": "v1", "created": "Thu, 29 Nov 2007 05:37:17 GMT" } ]
2009-11-13T00:00:00
[ [ "Ando", "Yoichi", "", "Osaka Univ." ] ]
[ 0.068262592, -0.0655167177, -0.1591512412, 0.0289415829, -0.0118827987, 0.1297154129, -0.0725461692, 0.0039815269, -0.0005895063, -0.1159860045, 0.0212256573, -0.0137637276, -0.07391911, 0.0409136228, 0.0205803756, -0.0173676964, -0.0382775776, 0.0450049862, 0.0641986951, 0.0666150674, -0.0828157663, -0.0534348376, 0.0041428474, -0.0154867675, 0.0069745369, -0.0562356375, 0.0760608986, -0.0114709167, 0.0406115763, -0.0733150169, 0.0431927033, -0.0238479748, -0.0782026872, -0.0973689333, -0.065571636, 0.0242873151, 0.0583774261, 0.0003361559, 0.0133518456, -0.0906689838, -0.09824761, -0.0078188954, -0.0230791271, 0.0642536059, 0.0524188653, 0.0715576559, -0.0139696682, -0.0716125667, 0.017065648, 0.0102421353, -0.0257151742, 0.0260995962, 0.0567848124, -0.0523914061, -0.0700748786, -0.0568397306, 0.045361951, 0.0957214013, 0.0292985477, -0.1374038756, -0.0436869636, -0.0760608986, -0.0650773719, 0.0045581618, -0.0298477244, -0.0166949555, -0.0295731351, 0.0514852628, 0.0542860627, 0.0088280067, -0.0676035807, -0.0439066328, 0.1137892976, -0.0400898606, 0.0616724826, -0.0211570114, 0.0409136228, 0.0081278067, -0.0450873636, 0.098137781, -0.0440439284, 0.076500237, -0.0242735855, -0.0325936042, 0.0029621189, 0.0070569133, -0.0115189701, 0.0578282475, -0.0534897558, -0.0706240535, 0.0473389849, 0.0968746692, 0.0218983982, 0.0241362918, 0.0930304378, -0.0380304493, 0.0469271019, -0.0188092832, -0.0029775645, -0.0350099802, -0.0802895501, -0.0406664945, 0.0681527629, 0.0523090288, 0.1387218982, 0.0517873093, -0.0147316502, -0.0713929012, -0.0658462197, 0.0007263712, 0.1475087106, 0.0391837172, -0.0551372841, 0.0590913519, -0.0544233583, -0.0582675897, -0.0533250049, -0.1427858025, -0.0428906567, 0.0767748281, 0.0009576259, 0.0752371326, 0.0732600987, 0.0679880083, -0.0106677469, -0.0464877598, 0.1020918489, -0.0702945441, -0.1432251334, -0.066505231, 0.1029705256, -0.0023511604, -0.0350923575, -0.0490139723, -0.0674937516, 0.051540181, -0.0126653751, -0.0399800241, 0.0649126172, -0.0801248029, 0.0339116268, -0.0277745835, 0.0788067803, 0.0321542621, 0.0214178693, 0.1155466586, 0.0444283523, -0.0148277562, 0.0735896006, 0.0244108792, 0.0685921013, -0.0364378393, 0.0454992428, 0.0314677916, 0.0898452178, -0.093909122, 0.1438841522, 0.0849026293, 0.0575536601, -0.0342960507, 0.0865501612, -0.016489014, -0.0310559105, -0.0218297523, 0.1390514076, 0.0519246049, -0.0697453693, -0.053929098, -0.0863854066, -0.1459710151, -0.028172737, 0.0935247019, -0.0593659431, 0.0019324136, 0.0206215642, 0.051952064, -0.0351472721, -0.1620069593, -0.0306440294, 0.0172990486, 0.0691961944, -0.0398152694, -0.0322091803, -0.0888567045, -0.0735346898, -0.1043983847, -0.0111070881, 0.0783674344, 0.0452246554, 0.049123805, -0.0929206014, 0.0264291018, -0.003238423, 0.0344058871, -0.0336370394, -0.0978631899, 0.0269508194, 0.0715027377, 0.0032281261, -0.0432750806, -0.022378929, 0.0499750301, 0.0204018932, -0.0587069318, -0.0570594035, 0.117633529, 0.0877034292, 0.0024472661, -0.0177246612, -0.0859460682, -0.0268135257, 0.0338292494, 0.1256515086, 0.0198664479, -0.0300124772, 0.0132694691, -0.1756265312, 0.0209373403, 0.0439890102, 0.0021915562, -0.0035593479, 0.0288592074, 0.0527209118, 0.174638018, 0.0450324453, 0.078751862, 0.0377009436, 0.0324563086, 0.0675486699, 0.0719969943, 0.0796305388, -0.0291063357, 0.0285846181, 0.0731502622, -0.0183287542, 0.0174226128, 0.0577733293, -0.0291337948, 0.0039163125, -0.0219945051, -0.0538741797, 0.0045924857, -0.0024318206, 0.0696355328, 0.003198951, 0.0102764592, -0.0400349423, -0.0052411999, 0.0746879578, -0.0139216157, -0.0522541106, 0.0392935537, 0.0050730146, 0.0092536183, -0.044538185, -0.0342136733 ]
711.4655
Alexander Shirokov V
Alexander Shirokov (CITA)
GRAvitational COSmology (GRACOS) code release announcement, for version 1.0.1a9
Complete package distribution is located: at http://www.gracos.org
null
null
null
astro-ph
null
This is to announce a recent release of version 1.0.1a9 of parallel load balanced adaptive P3M cosmological N-body code named GRACOS. The code has been under development over years and is available for the download at http://www.gracos.org. GRACOS features: embedded script environment, cosmological initial conditions generator including non-gaussian initial conditions, particle data imager, mass density power spectrum estimator, particle position and velocity integrator with a choice between KDK and DKD integration schemes with Plummer force softening, file input and output with four supported serial and one dynamic distributed data format, standard installation procedure, and version specific documentation. GRACOS is released under the GNU General Public License (GPL). High efficiency is achieved with a number of implemented techniques such as timer-based load balancing using Hilbert space filling curve, adaptive P3M method for short range force computation, run-level compression in interprocessor communication, dynamic allocation for irregular domains and various sorting algorithms.
[ { "version": "v1", "created": "Thu, 29 Nov 2007 17:28:40 GMT" } ]
2007-11-30T00:00:00
[ [ "Shirokov", "Alexander", "", "CITA" ] ]
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711.4656
Gun Srijuntongsiri
Gun Srijuntongsiri, Stephen A. Vavasis
A condition number analysis of an algorithm for solving a system of polynomial equations with one degree of freedom
null
null
null
null
cs.CG cs.NA
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This article considers the problem of solving a system of $n$ real polynomial equations in $n+1$ variables. We propose an algorithm based on Newton's method and subdivision for this problem. Our algorithm is intended only for nondegenerate cases, in which case the solution is a 1-dimensional curve. Our first main contribution is a definition of a condition number measuring reciprocal distance to degeneracy that can distinguish poor and well conditioned instances of this problem. (Degenerate problems would be infinitely ill conditioned in our framework.) Our second contribution, which is the main novelty of our algorithm, is an analysis showing that its running time is bounded in terms of the condition number of the problem instance as well as $n$ and the polynomial degrees.
[ { "version": "v1", "created": "Thu, 29 Nov 2007 06:02:16 GMT" }, { "version": "v2", "created": "Mon, 21 Dec 2009 04:08:32 GMT" } ]
2009-12-21T00:00:00
[ [ "Srijuntongsiri", "Gun", "" ], [ "Vavasis", "Stephen A.", "" ] ]
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711.4657
Stephen Lack
Stephen Lack
Icons
23 pages
Applied Categorical Structures, 18(3):289-307, 2010
10.1007/s10485-008-9136-5
null
math.CT
null
Categorical orthodoxy has it that collections of ordinary mathematical structures such as groups, rings, or spaces, form categories (such as the category of groups); collections of 1-dimensional categorical structures, such as categories, monoidal categories, or categories with finite limits, form 2-categories; and collections of 2-dimensional categorical structures, such as 2-categories or bicategories, form 3-categories. We describe a useful way in which to regard bicategories as objects of a 2-category. This is a bit surprising both for technical and for conceptual reasons. The 2-cells of this 2-category are the crucial new ingredient; they are the icons of the title. These can be thought of as ``the oplax natural transformations whose components are identities'', but we shall also give a more elementary description. We describe some properties of these icons, and give applications to monoidal categories, to 2-nerves of bicategories, to 2-dimensional Lawvere theories, and to bundles of bicategories.
[ { "version": "v1", "created": "Thu, 29 Nov 2007 06:03:02 GMT" } ]
2010-09-10T00:00:00
[ [ "Lack", "Stephen", "" ] ]
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711.4658
Masaki Kobayashi
M. Kobayashi, J. I. Hwang, G. S. Song, Y. Ooki, M. Takizawa, A. Fujimori, Y. Takeda, S.-I. Fujimori, K. Terai, T. Okane, Y. Saitoh, H. Yamagami, Y.-H. Lin, and C.-W. Nan
Systematic changes of the electronic structure of the diluted ferromagnetic oxide Li-doped Ni$_{1-x}$Fe$_x$O with hole doping
5 pages, 3 figures
Phys. Rev. B 78, 155322 (2008)
10.1103/PhysRevB.78.155322
null
cond-mat.mtrl-sci cond-mat.str-el
null
The electronic structure of Li-doped Ni$_{1-x}$Fe$_x$O has been investigated using photoemission spectroscopy (PES) and x-ray absorption spectroscopy (XAS). The Ni $2p$ core-level PES and XAS spectra were not changed by Li doping. In contrast, the Fe$^{3+}$ intensity increased with Li doping relative to the Fe$^{2+}$ intensity. However, the increase of Fe$^{3+}$ is only $\sim 5%$ of the doped Li content, suggesting that most of the doped holes enter the O $2p$ and/or the charge-transferred configuration Ni $3d^8\underline{L}$. The Fe 3d partial density of states and the host valence-band emission near valence-band maximum increased with Li content, consistent with the increase of electrical conductivity. Based on these findings, percolation of bound magnetic polarons is proposed as an origin of the ferromagnetic behavior.
[ { "version": "v1", "created": "Thu, 29 Nov 2007 06:05:18 GMT" } ]
2008-10-27T00:00:00
[ [ "Kobayashi", "M.", "" ], [ "Hwang", "J. I.", "" ], [ "Song", "G. S.", "" ], [ "Ooki", "Y.", "" ], [ "Takizawa", "M.", "" ], [ "Fujimori", "A.", "" ], [ "Takeda", "Y.", "" ], [ "Fujimori", "S. -I.", "" ], [ "Terai", "K.", "" ], [ "Okane", "T.", "" ], [ "Saitoh", "Y.", "" ], [ "Yamagami", "H.", "" ], [ "Lin", "Y. -H.", "" ], [ "Nan", "C. -W.", "" ] ]
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711.4659
Reijirou Fukuda
R.Fukuda
Underlying Determinism, Stationary Phase and Quantum Mechnics
10 pages, 1 figure
null
null
null
quant-ph
null
In a newly introduced time scale $\tau$, much smaller than the usual $t$, any object is assumed to be a point-like particle, having a definite position. It fluctuates without dynamics and the wave function $\Psi$ is defined by averaging the square root of the density. In $t$-scale, the Schr$\ddot{\rm o}$dinger equation holds and for a macrovariable just a classical path is picked up as a peak of $\Psi$ by the stationary phase, which is the observable signal. In the measuring process, the stationary phase branches into many but one branch is selected by underlying determinism, leading to the correct detection probability.
[ { "version": "v1", "created": "Thu, 29 Nov 2007 06:05:28 GMT" } ]
2007-11-30T00:00:00
[ [ "Fukuda", "R.", "" ] ]
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711.466
Prasenjit Sen
Kalpataru Pradhan (1), Prasenjit Sen (1), J. U. Reveles (2) and S. N. Khanna (2) ((1) HRI, Allahabad, (2) VCU, Richmond, USA)
First principles study of Sc, Ti and V doped Na$_n$(n =4, 5, 6) clusters: Enhanced magnetic moments
To appear in PRB
null
10.1103/PhysRevB.77.045408
null
cond-mat.mtrl-sci cond-mat.other
null
Theoretical studies on the geometry, electronic structure and spin multiplicity of Sc, Ti and V doped Na$_n$ (n = 4, 5, 6) clusters have been carried out within a gradient corrected density functional approach. Two complementary approaches including all-electron calculations on free clusters, and supercell calculations using planewave pseudopotential and projector augmented wave formalisms have been carried out. It is shown that spin magnetic moments of the transition metal atoms, the magnitude of host polarization, and the sign of the host polarization all change with the number of alkali atoms. In particular the transition metal atoms are shown to attain spin moments that are higher than their atomic values. The role of hybridization between the transition atom d-states and the alkali $sp$-states is highlighted to account for the evolutions in the spin moments and host polarization.
[ { "version": "v1", "created": "Thu, 29 Nov 2007 06:42:40 GMT" } ]
2009-11-13T00:00:00
[ [ "Pradhan", "Kalpataru", "", "HRI, Allahabad" ], [ "Sen", "Prasenjit", "", "HRI, Allahabad" ], [ "Reveles", "J. U.", "", "VCU, Richmond, USA" ], [ "Khanna", "S. N.", "", "VCU, Richmond, USA" ] ]
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711.4661
Gr\'egoire Dupont
G. Dupont
Caldero-Keller approach to the denominators of cluster variables
10 pages. Minor modifications : mainly layout and typos
null
null
null
math.RT
null
Buan, Marsh and Reiten proved that if a cluster-tilting object $T$ in a cluster category $\mathcal C$ associated to an acyclic quiver $Q$ satisfies certain conditions with respect to the exchange pairs in $\mathcal C$, then the denominator in its reduced form of every cluster variable in the cluster algebra associated to $Q$ has exponents given by the dimension vector of the corresponding module over the endomorphism algebra of $T$. In this paper, we give an alternative proof of this result using the Caldero-Keller approach to acyclic cluster algebras and the work of Palu on cluster characters.
[ { "version": "v1", "created": "Thu, 29 Nov 2007 15:41:52 GMT" }, { "version": "v2", "created": "Thu, 24 Apr 2008 10:36:33 GMT" } ]
2008-04-24T00:00:00
[ [ "Dupont", "G.", "" ] ]
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711.4662
Sergey Sevbitov
S. N. Sevbitov, T. V. Shishkina and I. L. Solovtsov
On statistical methods of structure function extraction
7 pages
null
null
null
hep-ph
null
Several methods of statistical analysis are proposed and analyzed in application for a specific task -- extraction of the structure functions from the cross sections of deep inelastic interactions of any type. We formulate the method based on the orthogonal weight functions and on an optimization procedure of errors minimization as well as methods underlying common $\chi^2$ minimization. Effectiveness of these methods usage is analyzed by comparison of the statistical parameters such as bias, extraction variance etc., for sample deep inelastic scattering data set.
[ { "version": "v1", "created": "Thu, 29 Nov 2007 07:30:31 GMT" } ]
2007-11-30T00:00:00
[ [ "Sevbitov", "S. N.", "" ], [ "Shishkina", "T. V.", "" ], [ "Solovtsov", "I. L.", "" ] ]
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711.4663
Chang-Young Ee
Ee Chang-Young, Hoil Kim, Hiroaki Nakajima
Noncommutative Superspace and Super Heisenberg Group
Explanations on the relations between Heisenberg algebra, operator representation, and noncommutative space are added. LaTeX 20 pages
JHEP 0804:004,2008
10.1088/1126-6708/2008/04/004
KIAS-P07077
hep-th math-ph math.MP
null
In this paper, we consider noncommutative superspace in relation with super Heisenberg group. We construct a matrix representation of super Heisenberg group and apply this to the two-dimensional deformed N=(2,2) superspace that appeared in string theory. We also construct a toy model for non-centrally extended `super Heisenberg group'.
[ { "version": "v1", "created": "Thu, 29 Nov 2007 07:19:57 GMT" }, { "version": "v2", "created": "Thu, 6 Mar 2008 09:11:22 GMT" } ]
2009-12-15T00:00:00
[ [ "Chang-Young", "Ee", "" ], [ "Kim", "Hoil", "" ], [ "Nakajima", "Hiroaki", "" ] ]
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711.4664
Michel Destrade
Alain Goriely, Michel Destrade (LMM), Martine Ben Amar (LPS)
Instabilities in elastomers and soft tissues
16 pages
The Quarterly Journal of Mechanics and Applied Mathematics 59 (2006) 615-630
10.1093/qjmam/hbl017
null
cond-mat.soft
null
Biological soft tissues exhibit elastic properties which can be dramatically different from rubber-type materials (elastomers). To gain a better understanding of the role of constitutive relationships in determining material responses under loads we compare three different types of instabilities (two in compression, one in extension) in hyperelasticity for various forms of strain energy functions typically used for elastomers and for soft tissues. Surprisingly, we find that the strain-hardening property of soft tissues does not always stabilize the material. In particular we show that the stability analyses for a compressed half-space and for a compressed spherical thick shell can lead to opposite conclusions: a soft tissue material is more stable than an elastomer in the former case and less stable in the latter case.
[ { "version": "v1", "created": "Thu, 29 Nov 2007 07:31:54 GMT" } ]
2007-11-30T00:00:00
[ [ "Goriely", "Alain", "", "LMM" ], [ "Destrade", "Michel", "", "LMM" ], [ "Amar", "Martine Ben", "", "LPS" ] ]
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711.4665
H. Panagopoulos
M. Constantinou, H. Panagopoulos (Department of Physics, University of Cyprus)
Gauge theories with overlap fermions in an arbitrary representation: Evaluation of the 3-loop beta-function
15 pages, 5 figures
Phys.Rev.D77:057503,2008
10.1103/PhysRevD.77.057503
null
hep-lat
null
This work presents the calculation of the relation between the bare coupling constant g_0 and the MSbar-renormalized coupling g_MS, g_0 = Z_g(g_0,a\mu) g_MS, to 2 loops in perturbation theory, with fermions in an arbitrary representation of the gauge group SU(N). Our calculation is performed using overlap fermions and Wilson gluons, and the background field technique has been chosen for convenience. The corresponding results in the fundamental representation appear in our longer publication [arXiv:0709.4368]. The 3-loop coefficient of the bare beta-function, b_2^L, is extracted using the 2-loop expression for Z_g, and it is presented as a function of the overlap parameter rho, the number of fermion flavors (N_f) and the number of colors (N). We also provide the expression for the ratio Lambda_L/Lambda_MS, in an arbitrary representation. A plot of Lambda_L/Lambda_MS is given in the adjoint representation.
[ { "version": "v1", "created": "Thu, 29 Nov 2007 07:37:20 GMT" } ]
2008-11-26T00:00:00
[ [ "Constantinou", "M.", "", "Department of Physics, University of\n Cyprus" ], [ "Panagopoulos", "H.", "", "Department of Physics, University of\n Cyprus" ] ]
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711.4666
Orkan Umurhan
O. M. Umurhan, E. Heifetz, N. Harnik, F. Lott
The instability of counter-propagating kernel gravity waves in a constant shear flow
Submitted to Physics of Fluids, 13 pages
null
null
null
physics.geo-ph astro-ph physics.ao-ph
null
The mechanism describing the recently developed notion of kernel gravity waves (KGWs) is reviewed and such structures are employed to interpret the unstable dynamics of an example stratified plane parallel shear flow. This flow has constant vertical shear, is infinite in the vertical extent, and characterized by two density jumps of equal magnitude each decreasing successively with height, in which the jumps are located symmetrically away from the midplane of the system. We find that for a suitably defined bulk-Richardson number there exists a band of horizontal wavenumbers which exhibits normal-mode instability. The instability mechanism closely parallels the mechanism responsible for the instability seen in the problem of counter-propagating Rossby waves. In this problem the instability arises out of the interaction of counter-propagating gravity waves. We argue that the instability meets the Hayashi-Young criterion for wave instability. We also argue that the instability is the simplest one that can arise in a stratified atmosphere with constant shear flow. The counter propagating gravity waves mechanism detailed here explains why the Rayleigh criteria for shear flow instability in the unstratified case does not need to be satisfied in the stratified case. This illustrates how the Miles-Howard theorem may support destabilization through stratification. A normal mode analysis of a foamy layer consisting of two density jumps of unequal magnitude is also analyzed. The results are considered in terms of observations made of sea-hurricane interfaces.
[ { "version": "v1", "created": "Thu, 29 Nov 2007 07:59:06 GMT" } ]
2007-11-30T00:00:00
[ [ "Umurhan", "O. M.", "" ], [ "Heifetz", "E.", "" ], [ "Harnik", "N.", "" ], [ "Lott", "F.", "" ] ]
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711.4667
Olivier Gorceix
E. Marechal (LPL), B. Laburthe-Tolra (LPL), L. Vernac (LPL), J. -C. Keller (LPL), O. Gorceix (LPL)
A magnetic lens for cold atoms controlled by a rf field
null
Applied Physics B Photophysics and Laser Chemistry 91, 3 (2008) 233
10.1007/s00340-008-2972-z
null
physics.atom-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We report on a new type of magnetic lens that focuses atomic clouds using a static inhomogeneous magnetic field in combination with a radio-frequency field. The experimental study is performed with a cloud of cold cesium atoms. The rf field adiabatically deforms the magnetic potential of a coil and therefore changes its focusing properties. The focal length can be tuned precisely by changing the rf frequency value. Depending on the rf antenna position relative to the DC magnetic profile, the focal length of the atomic lens can be either decreased or increased by the rf field.
[ { "version": "v1", "created": "Thu, 29 Nov 2007 08:05:48 GMT" }, { "version": "v2", "created": "Thu, 16 Oct 2008 07:34:54 GMT" } ]
2009-11-13T00:00:00
[ [ "Marechal", "E.", "", "LPL" ], [ "Laburthe-Tolra", "B.", "", "LPL" ], [ "Vernac", "L.", "", "LPL" ], [ "Keller", "J. -C.", "", "LPL" ], [ "Gorceix", "O.", "", "LPL" ] ]
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711.4668
Sebastian Volz
Po Chapuis (EM2C), Sourabh Kumar Saha (EM2C), S. Volz (EM2C)
Polymer nanoparticles to decrease thermal conductivity of phase change materials
null
null
null
null
cond-mat.mtrl-sci
null
Microparticles including paraffin are currently used for textiles coating in order to deaden thermal shocks. We will show that polymer nanoparticles embedded in those microsized capsules allow for decreasing the thermal conductivity of the coating and enhance the protection in the stationary regime. A reasonable volume fraction of polymer nanoparticles reduces the conductivity more than predicted by Maxwell mixing rules. Besides, measurements prove that the polymer nanoparticles do not affect the latent heat and even improve the phase change behaviour as well as the mechanical properties.
[ { "version": "v1", "created": "Thu, 29 Nov 2007 08:09:16 GMT" } ]
2007-11-30T00:00:00
[ [ "Chapuis", "Po", "", "EM2C" ], [ "Saha", "Sourabh Kumar", "", "EM2C" ], [ "Volz", "S.", "", "EM2C" ] ]
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711.4669
Akira Ishii Prof.
Akira Ishii, Masana Yamamoto, Hiroki Asano and Katsutoshi Fujiwara
DFT calculation for adatom adsorption on graphene sheet as a prototype of carbon nano tube functionalization
4 pages, 1 figure, 3 tables. To be published as Journal of Physics:Conference Series for IVC17/ICSS13
null
10.1088/1742-6596/100/5/052087
null
cond-mat.mtrl-sci
null
DFT calculation of various atomic species on graphene sheet is investigated as prototypes for formation of nano-structures on carbon nanotube (CNT) wall. We investigate computationally adsorption energies and adsorption sites on graphene sheet for a lot of atomic species including transition metals, noble metals, nitrogen and oxygen, using the DFT calculation as a prototype for CNT. The suitable atomic species can be chosen as each application from those results. The calculated results show us that Mo and Ru are bounded strongly on graphene sheet with large diffusion barrier energy. On the other hand, some atomic species has large binding energies with small diffusion barrier energies
[ { "version": "v1", "created": "Thu, 29 Nov 2007 08:31:11 GMT" } ]
2009-11-13T00:00:00
[ [ "Ishii", "Akira", "" ], [ "Yamamoto", "Masana", "" ], [ "Asano", "Hiroki", "" ], [ "Fujiwara", "Katsutoshi", "" ] ]
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711.467
Mathieu Dutour Sikiri\'c
Mathieu Dutour Sikiric, Anna Felikson and Pavel Tumarkin
Automorphism groups of root systems matroids
9 pages, 1 table
null
null
null
math.CO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Given a root system $\mathsf{R}$, the vector system $\tilde{\mathsf{R}}$ is obtained by taking a representative $v$ in each antipodal pair $\{v, -v\}$. The matroid $M(\mathsf{R})$ is formed by all independent subsets of $\tilde{\mathsf{R}}$. The automorphism group of a matroid is the group of permutations preserving its independent subsets. We prove that the automorphism groups of all irreducible root systems matroids $M(\mathsf{R})$ are uniquely determined by their independent sets of size 3. As a corollary, we compute these groups explicitly, and thus complete the classification of the automorphism groups of root systems matroids.
[ { "version": "v1", "created": "Thu, 29 Nov 2007 08:47:57 GMT" }, { "version": "v2", "created": "Wed, 5 Dec 2007 17:33:56 GMT" }, { "version": "v3", "created": "Tue, 25 Nov 2008 12:43:27 GMT" } ]
2008-11-25T00:00:00
[ [ "Sikiric", "Mathieu Dutour", "" ], [ "Felikson", "Anna", "" ], [ "Tumarkin", "Pavel", "" ] ]
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711.4671
Sandip P. Trivedi
Suresh Nampuri, Prasanta K.Tripathy, Sandip P. Trivedi
Duality Symmetry and the Cardy Limit
46 pages, Latex, Some comments added in Introduction and Conclusions. Minor changes made in sections 3.4 and 5
JHEP 0807:072,2008
10.1088/1126-6708/2008/07/072
IITM/PH/TH/2007/14, TIFR/TH/07-35
hep-th
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study supersymmetric and non-supersymmetric extremal black holes obtained in Type IIA string theory compactified on K3 X T^2, with duality group O(6,22,Z) X SL(2,Z). In the Cardy limit an internal circle combines with the AdS_2 component in the near horizon geometry to give a BTZ black hole whose entropy is given by the Cardy formula. We study black holes carrying D0-D4 and D0-D6 brane charges. We find, both in the supersymmetric and non-supersymmetric cases, that a generic set of charges cannot be brought to the Cardy limit using the duality symmetries. In the non-supersymmetric case, unlike the supersymmetric one, we find that when the charges are large, a small fractional change in them always allows the charges to be taken to the Cardy limit. These results could lead to a microscopic determination of the entropy for extremal non-supersymmetric black holes, including rotating cases like the extreme Kerr black hole in four dimensions.
[ { "version": "v1", "created": "Thu, 29 Nov 2007 09:13:06 GMT" }, { "version": "v2", "created": "Thu, 17 Apr 2008 11:04:49 GMT" }, { "version": "v3", "created": "Thu, 26 Jun 2008 09:43:14 GMT" } ]
2009-11-19T00:00:00
[ [ "Nampuri", "Suresh", "" ], [ "Tripathy", "Prasanta K.", "" ], [ "Trivedi", "Sandip P.", "" ] ]
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711.4672
Konrad Tywoniuk
I.C. Arsene, L. Bravina, A.B. Kaidalov, K. Tywoniuk, E. Zabrodin
Coherent J/psi production - a novel feature at LHC?
13 pages, 4 figures; experimental data and reference included, conclusions unchanged; to appear in Phys. Lett. B
Phys.Lett.B660:176-180,2008
10.1016/j.physletb.2007.12.055
null
hep-ph
null
Energy dependence of heavy quarkonia production in hadron-nucleus collisions is studied in the framework of the Glauber-Gribov theory. We emphasize a change in the space-time picture of heavy-quark state production on nuclei with energy. Longitudinally ordered scattering of a heavy-quark system takes place at low energies, while with increasing energy it transforms to a coherent scattering of projectile partons on the nuclear target. The characteristic energy scale for this transition depends on masses and rapidities of produced particles. For J/psi, produced in the central rapidity region, the transition happens at RHIC energies. The parameter-free calculation of J/psi in dAu collisions is in good agreement with recent RHIC data. We use distributions of gluons in nuclei to predict suppression of heavy quarkonia at LHC.
[ { "version": "v1", "created": "Thu, 29 Nov 2007 09:14:23 GMT" }, { "version": "v2", "created": "Wed, 19 Dec 2007 11:53:45 GMT" } ]
2008-11-26T00:00:00
[ [ "Arsene", "I. C.", "" ], [ "Bravina", "L.", "" ], [ "Kaidalov", "A. B.", "" ], [ "Tywoniuk", "K.", "" ], [ "Zabrodin", "E.", "" ] ]
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711.4673
Saharian
S.R. Arzumanyan, L.Sh. Grigoryan, H.F. Khachatryan, A.S. Kotanjyan, A.A. Saharian
On features of the radiation from an electron moving along a helix inside a cylindrical hole in a homogeneous dielectric
8 pages, 6 figures, talk presented at RREPS07, 24-28 September, 2007, Prague, Czech Republic
Nucl.Instrum.Meth.B266:3703-3707,2008
10.1016/j.nimb.2008.02.002
null
hep-th physics.class-ph
null
The radiation from a charge moving along a helical trajectory inside a cylindrical hole in homogeneous dielectric medium is investigated. Prompted by availability of materials with large dielectric permittivity $\epsilon $ and small absorption, we discuss the features of this type of radiation for media with $\epsilon \gg 1$. It is shown that there are high peaks in the angular distribution of radiation intensity at well-defined harmonics. The conditions are specified for the cavity-to-helix radii ratio, $\rho_{1}/\rho_{0}$, under which the angle-integrated radiation intensity on some harmonics exceeds that in the empty space. Though the amplification of radiation intensity increases with increasing $\epsilon $, the corresponding "resonant" values of $\rho _{1}/\rho_{0}$ ratio are practically independent of the dielectric permittivity of surrounding medium. It is shown that an analogous amplification of radiation takes place essentially for the same values of $\rho_{1}/\rho_{0}$ also for the radiation in a cylindrical waveguide with conducting walls. An explanation of this phenomenon is given.
[ { "version": "v1", "created": "Thu, 29 Nov 2007 09:18:10 GMT" } ]
2008-11-26T00:00:00
[ [ "Arzumanyan", "S. R.", "" ], [ "Grigoryan", "L. Sh.", "" ], [ "Khachatryan", "H. F.", "" ], [ "Kotanjyan", "A. S.", "" ], [ "Saharian", "A. A.", "" ] ]
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711.4674
Romesh K. Kaul
Romesh K. Kaul
Holst Actions for Supergravity Theories
15 pages
Phys.Rev.D77:045030,2008
10.1103/PhysRevD.77.045030
null
gr-qc hep-th
null
Holst action containing Immirzi parameter for pure gravity is generalised to the supergravity theories. Supergravity equations of motion are not modified by such generalisations, thus preserving supersymmetry. Dependence on the Immirzi parameter does not emerge in the classical equations of motion. This is in contrast with the recent observation of Perez and Rovelli for gravity action containing original Holst term and a minimally coupled Dirac fermion where the classical equations of motion do develop a dependence on Immirzi parameter.
[ { "version": "v1", "created": "Thu, 29 Nov 2007 09:26:22 GMT" } ]
2008-11-26T00:00:00
[ [ "Kaul", "Romesh K.", "" ] ]
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711.4675
Didier Barret
Didier Barret (CESR, Toulouse), Martin Boutelier (CESR, Toulouse), M. Coleman Miller (Univ. of Maryland)
Discovery of the upper kilo-Hz QPO from the X-ray transient Aql X-1
Accepted for publication in MNRAS, 7 pages, 4 figures, 4 Tables. Updated reference to Strohmayer, Markwardt, Kuulkers (2007, ApJL, in press) for the discovery of the spin frequency in 4U0614+09
null
10.1111/j.1365-2966.2007.12780.x
null
astro-ph
null
We report on a comprehensive analysis of the kilo-Hz (>~600 Hz) quasi-periodic oscillations (kHz QPOs) detected from the neutron star X-ray transient Aquila X-1 (Aql X-1) with the Rossi X-ray Timing Explorer, between 1997 and 2007. Among kHz QPO sources, Aql X-1 is peculiar because so far only one kHz QPO has been reported, whereas in most sources, two kHz QPOs are usually detected (a lower and an upper kHz QPO). The identification of the QPOs reported so far has therefore been ambiguous, although it has been proposed that they were likely to be the lower QPO. Following up on previous work, we confirm the identification of the QPOs previously reported as lower QPOs, because of their high quality factors and the quality factor versus frequency dependency, which are similar to those observed in other sources. Combining all segments of data containing a lower QPO, we detect for the first time an upper kHz QPO. As in other sources for which the neutron star spin frequency is larger than 400 Hz (550.25 Hz in Aql X-1), the frequency difference between the two kHz QPOs is close to half the spin frequency. Based on this result, we re-examine the link between the neutron star spin and the frequency of the kHz QPOs, to show that a model in which the separation of the lower and upper QPOs relates to the neutron star spin frequency is still as good as any comparably simple model.
[ { "version": "v1", "created": "Thu, 29 Nov 2007 09:45:16 GMT" }, { "version": "v2", "created": "Fri, 30 Nov 2007 17:07:57 GMT" } ]
2009-11-13T00:00:00
[ [ "Barret", "Didier", "", "CESR, Toulouse" ], [ "Boutelier", "Martin", "", "CESR, Toulouse" ], [ "Miller", "M. Coleman", "", "Univ. of Maryland" ] ]
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711.4676
Pieter Degroote
P. Degroote, D. Bodewits, M. Reyniers
Folding ion rays in comet C/2004 Q2 (Machholz) and the connection with the solar wind
4 pages, 4 figures, accepted by A&A
null
10.1051/0004-6361:20078902
null
astro-ph
null
The appearance of folding ion rays in cometary comae is still not very well understood, so our aim is to gain more insight into the role of the local solar wind in the formation of these structures. Comet C/2004 Q2 (Machholz) was intensively monitored during its closest approach to Earth (January 2005) with the CCD camera Merope mounted on the Flemish 1.2m Mercator telescope, in three different bands (Geneva U and B and Cousins I). Spectacular ion rays, thin ionic structures rapidly folding tailward, were recorded in the U band during one night, January 12th. Data from the SOHO satellite that was extrapolated corotationally to the position of the comet showed that the ion rays were formed during a sudden change in the in-situ solar wind state. We were able to succesfully correlate a high-speed solar wind stream with the appearance of folding ion rays. To our knowledge, this is the first clear observational evidence that folding ion rays in cometary comae are produced by a sudden change in the local solar wind state.
[ { "version": "v1", "created": "Thu, 29 Nov 2007 10:01:56 GMT" } ]
2009-11-13T00:00:00
[ [ "Degroote", "P.", "" ], [ "Bodewits", "D.", "" ], [ "Reyniers", "M.", "" ] ]
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711.4677
Emil Truhlik
V.B. Belyaev, M. Tater and E. Truhlik
Reply to the Comment on "Influence of protons on the capture of electrons by the nuclei of 7Be in the Sun"
7 pages
null
null
null
astro-ph nucl-th
null
We show that the arguments against our paper raised by B. Davids et al. are either irrelevant or incorrect.
[ { "version": "v1", "created": "Thu, 29 Nov 2007 09:54:05 GMT" } ]
2007-11-30T00:00:00
[ [ "Belyaev", "V. B.", "" ], [ "Tater", "M.", "" ], [ "Truhlik", "E.", "" ] ]
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711.4678
Cristina Zambon
Cristina Zambon
Defects in affine Toda field theories
Contribution to the proceedings of the International Workshop RAQIS'07, Recent Advances in Quantum Integrable Systems, 11-14 Semptember 2007
null
null
null
hep-th
null
In this talk some classical and quantum aspects concerning a special kind of integrable defect - called a jump-defect - will be reviewed. In particular, recent results obtained in an attempt to incorporate this defect in the affine Toda field theories, in addition to the sine-Gordon model, will be presented.
[ { "version": "v1", "created": "Thu, 29 Nov 2007 09:56:00 GMT" } ]
2007-11-30T00:00:00
[ [ "Zambon", "Cristina", "" ] ]
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711.4679
Mark J. Gotay
Marco Castrillon Lopez, Mark J. Gotay, Jerrold E. Marsden
Concatenating Variational Principles and the Kinetic Stress-Energy-Momentum Tensor
16 pages, 1 figure
null
null
null
math-ph math.MP
null
We show how to "concatenate" variational principles over different bases into one over a single base, thereby providing a unified Lagrangian treatment of interacting systems. As an example we study a Klein-Gordon field interacting with a mesically charged particle. We employ our method to give a novel group-theoretic derivation of the kinetic stress-energy-momentum tensor density corresponding to the particle.
[ { "version": "v1", "created": "Thu, 29 Nov 2007 09:56:45 GMT" } ]
2007-11-30T00:00:00
[ [ "Lopez", "Marco Castrillon", "" ], [ "Gotay", "Mark J.", "" ], [ "Marsden", "Jerrold E.", "" ] ]
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711.468
Boris Zupnik
B.M. Zupnik
Chern-Simons D=3, N=6 superfield theory
Latex file, 9 pages, v.2 a note and references added
Phys.Lett.B660:254-259,2008
10.1016/j.physletb.2007.12.052
null
hep-th
null
We construct the D=3, N=5 harmonic superspace using the SO(5)/U(1) x U(1) harmonics. Three gauge harmonic superfields satisfy the off-shell constraints of the Grassmann and harmonic analyticities. The corresponding component supermultiplet contains the gauge field A_m and an infinite number of bosonic and fermionic fields with the SO(5) vector indices arising from decompositions of gauge superfields in harmonics and Grassmann coordinates. The nonabelian superfield Chern-Simons action is invariant with respect to the N=6 superconformal supersymmetry realized on the N=5 superfields. The component Lagrangian contains the Chern-Simons interaction of A_m and an infinite number of bilinear and trilinear interactions of auxiliary fields. The fermionic and bosonic auxiliary fields from the infinite N=5 multiplet vanish on-shell.
[ { "version": "v1", "created": "Thu, 29 Nov 2007 10:14:14 GMT" }, { "version": "v2", "created": "Thu, 13 Dec 2007 09:17:36 GMT" } ]
2008-11-26T00:00:00
[ [ "Zupnik", "B. M.", "" ] ]
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711.4681
Norma Mankoc Borstnik
D. Bennett, G. Bregar, M. Breskvar, V.V. Dvoeglazov, M. Gregoric, M.Yu. Khlopov, A. Kleppe, L.V. Laperashvili, D. Lukman, N.S. Mankoc Borstnik, R. Mirman, H.B. Nielsen, M. Ninomiya
Proceedings to the 10th Workshop 'What Comes Beyond the Standard Models', Bled, July 17. - 27., 2007, Slovenia
Contains articles by different authors presented at the 10th Workshop 'What Comes Beyond the Standard Models', 17. - 27. September 2007, Bled, Slovenia. Editors were N. Mankoc Borstnik, H. Bech Nielsen, C.D. Froggatt, D. Lukman. vii+201pp
Bled workshops in physics, Vol.8, No. 2, DMFA-Zaloznistvo, Ljubljana, Dec. 2007
null
null
hep-ph
null
Contents: 1. Finestructure Constants at the Planck Scale from Multiple Point Principle (D.L.Bennett, L.V. Laperashvili and H.B. Nielsen) 2. Random Dynamics in Starting Levels (D. Bennett, A. Kleppe in H.B. Nielsen), 3. Families of Quarks and Leptons and Their Mass Matrices from the Approach Unifying Spins and Charges: Prediction for the Fourth Family (G. Bregar, M. Breskvar, D. Lukman and N.S. Mankoc Borstnik) 4. Fermion-Fermion and Boson-Boson Amplitudes: Surprising Similarities (V.V. Dvoeglazov) 5. Antisymmetric Tensor Fields, 4-Vector Fields, Indefinite Metrics and Normalization (V.V. Dvoeglazov) 6. Quantum Gates and Quantum Algorithms with Clifford Algebra Technique (M. Gregoric and N.S. Mankoc Borstnik) 7. From the Starting Lagrange Density to the Effective Fields for Spinors in the Approach Unifying Spins and Charges (N.S. Mankoc Borstnik) 8. New Generations of Particles in the Universe (M.Yu. Khlopov) 9. A Subversive View of Modern 'Physics' (R. Mirman) 10. Mass Spectra are Inherent in Geometry: an Analysis Using the Only Conformal Group Allowing a Universe (R. Mirman) 11. Complex Action, Prearrangement for Future and Higgs Broadening (H.B. Nielsen and M. Ninomiya) 12. Discussion on Dark Matter Candidates from the Approach Unifying Spins and Charges (G. Bregar and N.S. Mankoc Borstnik) 13. Discussion Section Summary on Dark Matter Particle Properties (M.Yu. Khlopov and N.S. Mankoc Borstnik)
[ { "version": "v1", "created": "Thu, 29 Nov 2007 10:31:03 GMT" } ]
2007-11-30T00:00:00
[ [ "Bennett", "D.", "" ], [ "Bregar", "G.", "" ], [ "Breskvar", "M.", "" ], [ "Dvoeglazov", "V. V.", "" ], [ "Gregoric", "M.", "" ], [ "Khlopov", "M. Yu.", "" ], [ "Kleppe", "A.", "" ], [ "Laperashvili", "L. V.", "" ], [ "Lukman", "D.", "" ], [ "Borstnik", "N. S. Mankoc", "" ], [ "Mirman", "R.", "" ], [ "Nielsen", "H. B.", "" ], [ "Ninomiya", "M.", "" ] ]
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711.4682
Qiping Su
Mingxing Luo and Qiping Su
Approximate $w_\phi\sim\Omega_\phi$ Relations in Quintessence Models
9 pages, 3 figures
Commun.Theor.Phys.54:186-190,2010
10.1088/0253-6102/54/1/34
null
astro-ph gr-qc
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Quintessence field is a widely-studied candidate of dark energy. There is "tracker solution" in quintessence models, in which evolution of the field $\phi$ at present times is not sensitive to its initial conditions. When the energy density of dark energy is neglectable ($\Omega_\phi\ll1$), evolution of the tracker solution can be well analysed from "tracker equation". In this paper, we try to study evolution of the quintessence field from "full tracker equation", which is valid for all spans of $\Omega_\phi$. We get stable fixed points of $w_\phi$ and $\Omega_\phi$ (noted as $\hat w_\phi$ and $\hat\Omega_\phi$) from the "full tracker equation", i.e., $w_\phi$ and $\Omega_\phi$ will always approach $\hat w_\phi$ and $\hat\Omega_\phi$ respectively. Since $\hat w_\phi$ and $\hat\Omega_\phi$ are analytic functions of $\phi$, analytic relation of $\hat w_\phi\sim\hat\Omega_\phi$ can be obtained, which is a good approximation for the $w_\phi\sim\Omega_\phi$ relation and can be obtained for the most type of quintessence potentials. By using this approximation, we find that inequalities $\hat w_\phi<w_\phi$ and $\hat\Omega_\phi<\Omega_\phi$ are statisfied if the $w_\phi$ (or $\hat w_\phi$) is decreasing with time. In this way, the potential $U(\phi)$ can be constrained directly from observations, by no need of solving the equations of motion numerically.
[ { "version": "v1", "created": "Thu, 29 Nov 2007 10:31:34 GMT" }, { "version": "v2", "created": "Fri, 21 Dec 2007 20:01:55 GMT" }, { "version": "v3", "created": "Fri, 11 Jan 2008 03:29:44 GMT" }, { "version": "v4", "created": "Fri, 26 Mar 2010 09:30:41 GMT" } ]
2014-11-18T00:00:00
[ [ "Luo", "Mingxing", "" ], [ "Su", "Qiping", "" ] ]
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711.4683
Juraj Bohacik
Juraj Boh\'a\v{c}ik and Peter Pre\v{s}najder
Functional integral with $\phi^4$ term in the action beyond standard perturbative methods II
New proof of the formulas added, text claryfied
null
null
null
hep-th
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
To avoid problems with infinite measure, the functional integral for harmonic oscillator can be calculated by time - slicing method with continuum limit procedure proposed Gelfand and Yaglom. In previous article we proved by nonperturbative calculation the generalized Gelfand-Yaglom equation for anharmonic oscillator with positive or negative mass term. In this article we prove by step-by-step the calculation of the correction function to the Gelfand-Yaglom equation for an-harmonic oscillator.
[ { "version": "v1", "created": "Thu, 29 Nov 2007 10:48:47 GMT" }, { "version": "v2", "created": "Thu, 18 Dec 2008 11:57:42 GMT" } ]
2008-12-18T00:00:00
[ [ "Boháčik", "Juraj", "" ], [ "Prešnajder", "Peter", "" ] ]
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711.4684
Maria Hermanns
M. Hermanns, J. Suorsa, E.J. Bergholtz, T.H. Hansson, and A. Karlhede
Quantum Hall wave functions on the torus
null
Phys. Rev. B 77, 125321 (2008)
10.1103/PhysRevB.77.125321
null
cond-mat.mes-hall
null
We present explicit expressions for a large set of hierarchy wave functions on the torus. Included are the Laughlin states, the states in the positive Jain series, and recently observed states at e.g. $\nu = 4/11$. The techniques we use constitute a nontrivial extension of the conformal field theory methods developed earlier to construct the corresponding wave functions in disc geometry.
[ { "version": "v1", "created": "Thu, 29 Nov 2007 11:09:43 GMT" }, { "version": "v2", "created": "Thu, 20 Mar 2008 14:48:27 GMT" } ]
2009-11-13T00:00:00
[ [ "Hermanns", "M.", "" ], [ "Suorsa", "J.", "" ], [ "Bergholtz", "E. J.", "" ], [ "Hansson", "T. H.", "" ], [ "Karlhede", "A.", "" ] ]
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711.4685
Carles Bona
Daniela Alic, Carles Bona and Carles Bona-Casas
A new dissipation term for finite-difference simulations in Relativity
Talk presented at the Spanish Relativity Meeting (Tenerife 2007)
null
10.1051/eas:0830029
null
gr-qc
null
We present a new numerical dissipation algorithm, which can be efficiently used in combination with centered finite-difference methods. We start from a formulation of centered finite-volume methods for Numerical Relativity, in which third-order space accuracy can be obtained by employing just piecewise-linear reconstruction. We obtain a simplified version of the algorithm, which can be viewed as a centered finite-difference method plus some 'adaptive dissipation'. The performance of this algorithm is confirmed by numerical results obtained from 3D black hole simulations.
[ { "version": "v1", "created": "Thu, 29 Nov 2007 10:52:54 GMT" } ]
2009-11-13T00:00:00
[ [ "Alic", "Daniela", "" ], [ "Bona", "Carles", "" ], [ "Bona-Casas", "Carles", "" ] ]
[ 0.0575918332, 0.0787392557, 0.0268234108, 0.0140088247, 0.0226234477, 0.033358179, -0.0313454159, 0.0098088607, -0.0541030467, -0.0516072214, -0.0678435043, -0.0147736743, -0.1268845201, 0.0302987806, 0.1261330992, 0.1147542819, 0.0803494677, 0.0144247953, 0.048494149, 0.1457776576, -0.0300572477, -0.0741769969, 0.0626371577, -0.0611879714, -0.0422143303, -0.0779878274, 0.040684633, 0.0075679859, 0.0937678814, -0.1034828126, 0.0744453669, -0.0155519424, -0.0684339106, -0.0421874933, -0.0337070562, 0.1567270756, 0.0005329627, 0.1108897775, -0.1027850583, -0.0259512141, -0.0010952781, -0.0438782163, -0.1196922585, 0.065267168, -0.057162445, 0.040550448, 0.0187186878, 0.0759482235, 0.0945729837, -0.0488967039, -0.015914239, 0.0389402397, -0.0104999095, -0.0454884246, -0.0536468215, -0.0380546227, 0.0013594531, 0.0424827002, 0.0416775942, -0.0705271885, -0.0529759005, -0.0517145693, 0.0036430995, -0.0195372123, -0.0972029939, 0.0373300277, -0.1032144427, 0.0887762308, 0.0693463683, 0.1739026457, -0.105737105, 0.0390207507, 0.0432609692, -0.005001714, -0.0351562463, 0.0015045397, -0.0287959166, 0.0252534561, 0.0128011676, 0.0835162103, 0.0772900656, 0.0747137293, 0.0071654334, -0.0257096812, -0.0231736023, -0.0466692448, 0.0007308843, 0.0004524522, -0.0410066731, -0.0807788521, 0.1026777104, 0.0705808625, -0.08115457, 0.012089991, 0.0031550047, -0.0697220787, 0.0409261659, 0.0025125982, 0.0802957937, 0.1070252731, -0.0433683172, -0.0061624069, 0.1021946445, -0.082818456, 0.1755128652, 0.0451663844, -0.0382424816, -0.0480915979, -0.0322310328, 0.1070252731, 0.0790076256, 0.0001344986, -0.0047635371, -0.0335728712, 0.0048205652, -0.0692390203, 0.0116740204, 0.0308623537, -0.0804031417, 0.1067569032, -0.0176720526, 0.0347268581, 0.0977934077, 0.0558206029, 0.0193225164, -0.1131440699, 0.0875417367, -0.0990815759, -0.0510436483, 0.0130024441, 0.0378667638, 0.0124321608, 0.0346195102, -0.0945729837, 0.0597924553, -0.0150688794, -0.0530295745, 0.0012957157, 0.0579138771, -0.0557132587, 0.0028597997, 0.0353709422, 0.0514193624, -0.0254010577, 0.1510376781, 0.0716006607, -0.0193627719, 0.0243007485, 0.0613489896, -0.0589336753, -0.1420204937, 0.0457299575, 0.0209595636, -0.0204764996, -0.0216573216, -0.0286080595, 0.1010138243, 0.0377862565, -0.0038611488, -0.0700441226, -0.1441674381, 0.0223684963, -0.0947340056, -0.0602755174, 0.0838919282, -0.0347268581, -0.0244617704, 0.0197116509, -0.0953244194, -0.0498896651, 0.0534321256, -0.0778268054, -0.0804031417, -0.0362565555, 0.0735865831, 0.0024169919, 0.0832478404, -0.0442002565, 0.0231333468, 0.0419728011, -0.0228783973, 0.0085676573, 0.0605438873, 0.0665016621, 0.0320431739, -0.0129353516, -0.0784172118, 0.105898127, -0.0456226096, -0.0155385239, -0.0776657835, 0.0850190744, -0.0035894259, 0.0872196928, -0.098544836, 0.0294131637, 0.0315869488, 0.0085274028, -0.0432609692, -0.0455689356, 0.0214157887, 0.0530027375, 0.0260719787, -0.0128011676, 0.0074673477, -0.016746182, 0.0693463683, -0.057269793, -0.0778268054, -0.0217512492, 0.0079772472, 0.0423485152, 0.0707955584, 0.0313722529, -0.1118559018, 0.0428047404, -0.0399063639, 0.0700977966, 0.0471254699, 0.1452409178, 0.0074069649, 0.0409798361, -0.0044247224, 0.0731035247, -0.0091379406, -0.0772900656, 0.1350429207, -0.0313722529, -0.0330898091, 0.0124053238, 0.1046636328, 0.0262195822, -0.0423753522, 0.075572513, 0.0378399305, -0.0458104685, 0.0163838845, 0.0137941297, -0.0254547317, -0.0331703201, -0.0656428859, 0.0556059107, -0.0605975613, -0.089957051, -0.0258304477, 0.0100369742, -0.0705271885, -0.0444417894, 0.0274406578, -0.0063301371, 0.0359881893, 0.0263135117, 0.0409529991, -0.0253742225, -0.0267294813, -0.0351294093 ]
711.4686
Eugene Churazov
E.Churazov, W.Forman, A.Vikhlinin, S.Tremaine, O.Gerhard, C.Jones
Measuring the non-thermal pressure in early type galaxy atmospheres: A comparison of X-ray and optical potential profiles in M87 and NGC1399
Accepted for MNRAS. 19 pages; 14 figures; expanded version in response to comments from the referee
null
10.1111/j.1365-2966.2008.13507.x
null
astro-ph
null
We compare the gravitational potential profiles of the elliptical galaxies NGC 4486 (M87) and NGC 1399 (the central galaxy in the Fornax cluster) derived from X-ray and optical data. This comparison suggests that the combined contribution of cosmic rays, magnetic fields and micro-turbulence to the pressure is ~10% of the gas thermal pressure in the cores of NGC 1399 and M87, although the uncertainties in our model assumptions (e.g., spherical symmetry) are sufficiently large that the contribution could be consistent with zero. In the absence of any other form of non-thermal pressure support, these upper bounds translate into upper limits on the magnetic field of ~10-20 muG at a distance of 1'-2' from the centers of NGC1399 and M87. We show that these results are consistent with the current paradigm of cool cluster cores, based on the assumption that AGN activity regulates the thermal state of the gas by injecting energy into the intra-cluster medium. The limit of ~10-20% on the energy density in the form of relativistic protons applies not only to the current state of the gas, but essentially to the entire history of the intra-cluster medium, provided that cosmic ray protons evolve adiabatically and that their spatial diffusion is suppressed.
[ { "version": "v1", "created": "Thu, 29 Nov 2007 11:03:34 GMT" }, { "version": "v2", "created": "Sun, 16 Dec 2007 13:52:30 GMT" }, { "version": "v3", "created": "Thu, 29 May 2008 08:22:37 GMT" } ]
2009-11-13T00:00:00
[ [ "Churazov", "E.", "" ], [ "Forman", "W.", "" ], [ "Vikhlinin", "A.", "" ], [ "Tremaine", "S.", "" ], [ "Gerhard", "O.", "" ], [ "Jones", "C.", "" ] ]
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711.4687
Christian Beck
L. Leon Chen, Christian Beck
A superstatistical model of metastasis and cancer survival
15 pages, 7 figures
null
null
null
physics.med-ph cond-mat.stat-mech physics.bio-ph
null
We introduce a superstatistical model for the progression statistics of malignant cancer cells. The metastatic cascade is modeled as a complex nonequilibrium system with several macroscopic pathways and inverse-chi-square distributed parameters of the underlying Poisson processes. The predictions of the model are in excellent agreement with observed survival time probability distributions of breast cancer patients.
[ { "version": "v1", "created": "Thu, 29 Nov 2007 11:14:07 GMT" } ]
2007-11-30T00:00:00
[ [ "Chen", "L. Leon", "" ], [ "Beck", "Christian", "" ] ]
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711.4688
Martin Schlichenmaier
Martin Schlichenmaier, Oleg K. Sheinman
Central extensions of Lax operator algebras
43 pages
Russian Math. Surveys 63:4 (2008) 727--766
10.1070/RM2008v063n04ABEH004550
null
math.QA math.AG
null
Lax operator algebras were introduced by Krichever and Sheinman as a further development of I.Krichever's theory of Lax operators on algebraic curves. These are almost-graded Lie algebras of current type. In this article local cocycles and associated almost-graded central extensions are classified. It is shown that in the case that the corresponding finite-dimensional Lie algebra is simple the two-cohomology space is one-dimensional. An important role is played by the action of the Lie algebra of meromorphic vector fields on the Lax operator algebra via suitable covariant derivatives.
[ { "version": "v1", "created": "Thu, 29 Nov 2007 11:23:17 GMT" } ]
2010-04-08T00:00:00
[ [ "Schlichenmaier", "Martin", "" ], [ "Sheinman", "Oleg K.", "" ] ]
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711.4689
Frederick Cohen
A. Bahri, M. Bendersky, F. R. Cohen and S. Gitler
The polyhedral product functor: a method of computation for moment-angle complexes, arrangements and related spaces
null
null
null
null
math.AT math.AC math.AG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This article gives a natural decomposition of the suspension of generalized moment-angle complexes or {\it partial product spaces} which arise as {\it polyhedral product functors} described below. In the special case of the complements of certain subspace arrangements, the geometrical decomposition implies the homological decomposition in Goresky-MacPherson \cite{goresky.macpherson}, Hochster\cite{hochster}, Baskakov \cite{baskakov}, Panov \cite{panov}, and Buchstaber-Panov \cite{buchstaber.panov}. Since the splitting is geometric, an analogous homological decomposition for a generalized moment-angle complex applies for any homology theory. This decomposition gives an additive decomposition for the Stanley-Reisner ring of a finite simplicial complex and generalizations of certain homotopy theoretic results of Porter \cite{porter} and Ganea \cite{ganea}. The spirit of the work here follows that of Denham-Suciu in \cite{denham.suciu}.
[ { "version": "v1", "created": "Thu, 29 Nov 2007 11:29:00 GMT" }, { "version": "v2", "created": "Mon, 8 Dec 2008 22:05:27 GMT" } ]
2008-12-09T00:00:00
[ [ "Bahri", "A.", "" ], [ "Bendersky", "M.", "" ], [ "Cohen", "F. R.", "" ], [ "Gitler", "S.", "" ] ]
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711.469
Alex Bernardini
Alex E. Bernardini
Obtaining the Gauge Invariant Kinetic Term for a SU(n)$_U$ x SU(m)$_V$ Lagrangian
6 pages
Int. J. Theor. Phys. 47 (2008) 971-976
10.1007/s10773-007-9523-y
null
math-ph math.MP
null
We propose a generalized way to formally obtain the gauge invariance of the kinetic part of a field Lagrangian over which a gauge transformation ruled by an $SU(n)_{U} \otimes SU(m)_{V}$ coupling symmetry is applied. As an illustrative example, we employ such a formal construction for reproducing the standard model Lagrangian. This generalized formulation is supposed to contribute for initiating the study of gauge transformation applied to generalized $SU(n)_{U} \otimes SU(m)_{V}$ symmetries as well as for complementing an introductory study of the standard model of elementary particles.
[ { "version": "v1", "created": "Thu, 29 Nov 2007 11:50:33 GMT" } ]
2009-11-10T00:00:00
[ [ "Bernardini", "Alex E.", "" ] ]
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711.4691
Juraj Bohacik
Juraj Boh\'a\v{c}ik and Peter Pre\v{s}najder
Study of an Abelinization Transition in SU(2) Gluodynamics at Finite Temperature
Conference Hadron Structure'07, September 3-7th, 2007, Modra - Harmonia, Slovakia
Fizika B17:355-362,2008
null
null
hep-ph
null
We discuss the problem of an effective descriptions of the phase transition phenomena in the pure gluodynamics in SU(2) symmetric QCD. We choose the method of calculation following the conjecture that the infrared sector of the theory possesses the same confinement characteristic as the full theory. We show, that analytic descriptions of this phenomena is beyond the Gaussian method of evaluations of functional integrals. We propose a non-perturbative evaluation of functional integral, meanwhile for two dimensional Wiener integral for $\phi^4$ theory.
[ { "version": "v1", "created": "Thu, 29 Nov 2007 11:54:01 GMT" } ]
2009-02-20T00:00:00
[ [ "Boháčik", "Juraj", "" ], [ "Prešnajder", "Peter", "" ] ]
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711.4692
Delia Ionescu
Delia Ionescu-Kruse
Variational derivation of the Camassa-Holm shallow water equation
10 pages
Journal of Nonlinear Mathematical Physics, 14 (2007), 303-312
10.2991/jnmp.2007.14.3.1
null
math-ph math.MP
null
We describe the physical hypothesis in which an approximate model of water waves is obtained. For an irrotational unidirectional shallow water flow, we derive the Camassa-Holm equation by a variational approach in the Lagrangian formalism.
[ { "version": "v1", "created": "Thu, 29 Nov 2007 12:53:09 GMT" } ]
2015-05-13T00:00:00
[ [ "Ionescu-Kruse", "Delia", "" ] ]
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711.4693
David Weldrake
David T. F. Weldrake (1) and Daniel D. R. Bayliss (2) ((1) MPIA, Heidelberg (2) RSAA, Mount Stromlo Observatory)
A Deep Catalog of Variable Stars in a 0.66deg^2 Lupus Field
35 pages, 17 figures, accepted for publication in AJ
null
10.1088/0004-6256/135/2/649
null
astro-ph
null
We have conducted a wide-field photometric survey in a single 52'x52' field towards the Lupus Galactic Plane in an effort to detect transiting Hot Jupiter planets. The planet Lupus-TR-3b was identified from this work. The dataset also led to the detection of 494 field variables, all of which are new discoveries. This paper presents an overview of the project, along with the total catalog of variables, which comprises 190 eclipsing binaries (of contact, semi-contact and detached configurations), 51 miscellaneous pulsators of various types, 237 long period variables (P>=2d), 11 delta Scuti stars, 4 field RR Lyrae (3 disk and 1 halo) and 1 irregular variable. Our survey provides a complete catalog of W UMa eclipsing binaries in the field to V=18.8, which display a Gaussian period distribution of 0.277+/-0.036d. Several binary systems are likely composed of equal mass M-dwarf components and others display evidence of mass transfer. We find 17 candidate blue stragglers and one binary that has the shortest period known, 0.2009d (V=20.9). The frequency of eclipsing binaries (all types) is found to be 1.7+/-0.4x10^{-3} per star, substantially higher (by a factor of 3-10) than previously determined in the haloes of the globular clusters 47 Tuc and omega Cen. This indicates that cluster dynamics aids mass segregation and binary destruction.
[ { "version": "v1", "created": "Thu, 29 Nov 2007 11:55:24 GMT" } ]
2009-11-13T00:00:00
[ [ "Weldrake", "David T. F.", "" ], [ "Bayliss", "Daniel D. R.", "" ] ]
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711.4694
Gregorio Roper Yearwood
H. Gast, R. Greim, T. Kirn, G. Roper Yearwood, S. Schael
A high resolution scintillating fiber tracker with SiPM readout for the PEBS experiment
6 pages, 5 figures, presented at the ICATPP 10
null
null
null
physics.ins-det
null
Using thin scintillating fibers with Silicon Photomultiplier (SiPM) readout a mo dular high-resolution charged-particle tracking detector has been designed. The fiber modules consist of 2 x 5 layers of 128 round multiclad scintillating fiber s of 0.250mm diameter. The fibers are read out by four SiPM arrays (8mm x 1mm) e ach on either end of the module.
[ { "version": "v1", "created": "Thu, 29 Nov 2007 11:58:15 GMT" } ]
2007-11-30T00:00:00
[ [ "Gast", "H.", "" ], [ "Greim", "R.", "" ], [ "Kirn", "T.", "" ], [ "Yearwood", "G. Roper", "" ], [ "Schael", "S.", "" ] ]
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711.4695
Alex Bernardini
Alex E. Bernardini
Delay Times for Symmetrized and Antisymmetrized Quantum Tunneling Configurations
11 pages, 2 figures
Eur. Phys. J . D48 (2008) 151-155
10.1140/epjd/e2008-00090-6
null
quant-ph hep-th
null
The transit times are obtained for a symmetrized (two identical bosons) and an antisymmetrized (two identical fermions) quantum colliding configuration. Considering two identical particles symmetrically impinging on a one-dimensional barrier, we demonstrate that the phase time and the dwell time give connected results where, however, the exact position of the scattered particles is explicitly determined by the phase time (group delay). For the antisymmetrized wave function configuration, an unusual effect of {\em accelerated} transmission is clearly identified in a simultaneous tunneling of two identical fermions.
[ { "version": "v1", "created": "Thu, 29 Nov 2007 12:01:18 GMT" }, { "version": "v2", "created": "Sun, 20 Apr 2008 19:02:01 GMT" } ]
2017-11-08T00:00:00
[ [ "Bernardini", "Alex E.", "" ] ]
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711.4696
Alexei Zhedanov
Alexei Zhedanov
Elliptic polynomials orthogonal on the unit circle with a dense point spectrum
28 pages
null
null
null
math.CA
null
We introduce two explicit examples of polynomials orthogonal on the unit circle. Moments and the reflection coefficients are expressed in terms of Jacobi elliptic functions. We find explicit expression for these polynomials in terms of a new type of elliptic hypergeometric function. We show that obtained polynomials are orthogonal on the unit circle with respect to a dense point meausure, i.e. the spectrum consists from infinite number points of increase which are dense on the unit circle. We construct also corresponding explicit systems of polynomials orthogonal on the interval of the real axis with respect to a dense point measure. They can be considered as an elliptic generalization of the Askey-Wilson polynomials of a special type.
[ { "version": "v1", "created": "Thu, 29 Nov 2007 12:04:06 GMT" }, { "version": "v2", "created": "Mon, 10 Dec 2007 10:20:17 GMT" }, { "version": "v3", "created": "Tue, 18 Dec 2007 06:45:00 GMT" } ]
2007-12-18T00:00:00
[ [ "Zhedanov", "Alexei", "" ] ]
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711.4697
Ady Stern
Ady Stern (Weizmann)
Anyons and the quantum Hall effect - a pedagogical review
Invited review for the Annals of Physics
null
10.1016/j.aop.2007.10.008
null
cond-mat.mes-hall cond-mat.str-el
null
The dichotomy between fermions and bosons is at the root of many physical phenomena, from metallic conduction of electricity to super-fluidity, and from the periodic table to coherent propagation of light. The dichotomy originates from the symmetry of the quantum mechanical wave function to the interchange of two identical particles. In systems that are confined to two spatial dimensions particles that are neither fermions nor bosons, coined "anyons", may exist. The fractional quantum Hall effect offers an experimental system where this possibility is realized. In this paper we present the concept of anyons, we explain why the observation of the fractional quantum Hall effect almost forces the notion of anyons upon us, and we review several possible ways for a direct observation of the physics of anyons. Furthermore, we devote a large part of the paper to non-abelian anyons, motivating their existence from the point of view of trial wave functions, giving a simple exposition of their relation to conformal field theories, and reviewing several proposals for their direct observation.
[ { "version": "v1", "created": "Thu, 29 Nov 2007 12:22:31 GMT" } ]
2009-11-13T00:00:00
[ [ "Stern", "Ady", "", "Weizmann" ] ]
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711.4698
Marc Kesseb\"ohmer
Marc Kesseb\"ohmer, Bernd O. Stratmann
H\"older-differentiability of Gibbs distribution functions
13 pages, 2 figures
Math. Proc. Camb. Phil. Soc. 147 (2009) no. 2, 489-503
10.1017/S0305004109002473
null
math.DS math.PR
null
In this paper we give non-trivial applications of the thermodynamic formalism to the theory of distribution functions of Gibbs measures (devil's staircases) supported on limit sets of finitely generated conformal iterated function systems in $\R$. For a large class of these Gibbs states we determine the Hausdorff dimension of the set of points at which the distribution function of these measures is not $\alpha$-H\"older-differentiable. The obtained results give significant extensions of recent work by Darst, Dekking, Falconer, Li, Morris, and Xiao. In particular, our results clearly show that the results of these authors have their natural home within thermodynamic formalism.
[ { "version": "v1", "created": "Thu, 29 Nov 2007 12:17:34 GMT" } ]
2010-06-30T00:00:00
[ [ "Kesseböhmer", "Marc", "" ], [ "Stratmann", "Bernd O.", "" ] ]
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711.4699
Nicolas Destainville
Nicolas Destainville
Theory of fluorescence correlation spectroscopy at variable observation area for two-dimensional diffusion on a meshgrid
19 pages, 7 figures
Soft Matter 4, 1288 (2008)
null
null
cond-mat.stat-mech q-bio.SC
null
It has recently been proposed, with the help of numerical investigations, that fluorescence correlation spectroscopy at variable observation area can reveal the existence of a meshgrid of semi-permeable barriers hindering the two-dimensional diffusion of tagged particles, such as plasmic membrane constituents. We present a complete theory confirming and accounting for these findings. It enables a reliable, quantitative exploitation of experimental data from which the sub-wavelength mesh size can be extracted. Time scales at which fluorescence correlation spectroscopy must be performed experimentally are discussed in detail.
[ { "version": "v1", "created": "Thu, 29 Nov 2007 12:24:25 GMT" } ]
2008-07-15T00:00:00
[ [ "Destainville", "Nicolas", "" ] ]
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711.47
Gabriele Breuer
Rainer Beck (MPI fuer Radioastronomie, Bonn, Germany)
Galactic Dynamos and Galactic Winds
8 pages, 7 figures. To be published in "The UV Window to the Universe", eds. A.I. Gomez de Castro and M. Castellanos, Ap&SS Special Issue, Springer, Berlin. Changed content (following referee report) April 2008
Astrophys.Space Sci.320:77-84,2009
10.1007/s10509-008-9825-4
null
astro-ph
null
Spiral galaxies host dynamically important magnetic fields which can affect gas flows in the disks and halos. Total magnetic fields in spiral galaxies are strongest (up to 30 \muG) in the spiral arms where they are mostly turbulent or tangled. Polarized synchrotron emission shows that the resolved regular fields are generally strongest in the interarm regions (up to 15 \muG). Faraday rotation measures of radio polarization vectors in the disks of several spiral galaxies reveal large-scale patterns which are signatures of coherent fields generated by a mean-field dynamo. -- Magnetic fields are also observed in radio halos around edge-on galaxies at heights of a few kpc above the disk. Cosmic-ray driven galactic winds transport gas and magnetic fields from the disk into the halo. The magnetic energy density is larger than the thermal energy density, but smaller than the kinetic energy density of the outflow. The orientation of field lines allows to estimate the wind speed and direction. There is no observation yet of a halo with a large-scale coherent dynamo pattern. A global wind outflow may prevent the operation of a dynamo in the halo. -- Halo regions with high degrees of radio polarization at very large distances from the disk are excellent tracers of interaction between galaxies or ram pressure of the intergalactic medium. The observed extent of radio halos is limited by energy losses of the cosmic-ray electrons. -- Future low-frequency radio telescopes like LOFAR and the SKA will allow to trace halo outflows and their interaction with the intergalactic medium to much larger distances.
[ { "version": "v1", "created": "Thu, 29 Nov 2007 12:32:39 GMT" }, { "version": "v2", "created": "Thu, 24 Apr 2008 14:25:43 GMT" } ]
2009-06-23T00:00:00
[ [ "Beck", "Rainer", "", "MPI fuer Radioastronomie, Bonn, Germany" ] ]
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711.4701
Delia Ionescu
Delia Ionescu-Kruse
Variational derivation of the Camassa-Holm shallow water equation with non-zero vorticity
14 pages
Disc. Cont. Dyn. Syst.-A, 19 (2007), 531--543
null
null
math-ph math.MP
null
We describe the physical hypotheses underlying the derivation of an approximate model of water waves. For unidirectional surface shallow water waves moving over an irrotational flow as well as over a non-zero vorticity flow, we derive the Camassa-Holm equation by an interplay of variational methods and small-parameter expansions.
[ { "version": "v1", "created": "Thu, 29 Nov 2007 12:47:04 GMT" } ]
2007-11-30T00:00:00
[ [ "Ionescu-Kruse", "Delia", "" ] ]
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711.4702
M. M. Glazov
M.M. Glazov and L.E. Golub
Quantum and classical multiple scattering effects in spin dynamics of cavity polaritons
10 pages, 5 figures
null
10.1103/PhysRevB.77.165341
null
cond-mat.mes-hall cond-mat.dis-nn cond-mat.other
null
The transport properties of exciton-polaritons are studied with allowance for their polarization. Both classical multiple scattering effects and quantum effects such as weak localization are taken into account in the framework of a generalized kinetic equation. The longitudinal-transverse (TE-TM) splitting of polariton states which plays role analogous to the spin-orbit splitting in electron systems is taken into account. The developed formalism is applied to calculate the particle and spin diffusion coefficients of exciton-polaritons, spin relaxation rates and the polarization conversion efficiency under the conditions of the optical spin Hall effect. In contrast to the electron systems, strong spin splitting does not lead to the antilocalization behavior of the particle diffusion coefficient, while quantum corrections to spin diffusion and polarization conversion can be both negative and positive depending on the spin splitting value.
[ { "version": "v1", "created": "Thu, 29 Nov 2007 12:47:53 GMT" } ]
2009-11-13T00:00:00
[ [ "Glazov", "M. M.", "" ], [ "Golub", "L. E.", "" ] ]
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711.4703
Shuang-Wei Hu
Shuang-Wei Hu, Ming-Guang Hu, Kang Xue, Mo-Lin Ge
Optical Simulation of Yang-Baxter Equation
15 pages, 7 figures; introduction and second section are dramatically rewritten, in order to improve the physical sense
null
10.1103/PhysRevA.78.022319
null
quant-ph
null
In this paper, several proposals of optically simulating Yang-Baxter equations have been presented. Motivated by the recent development of anyon theory, we apply Temperley-Lieb algebra as a bridge to recast four-dimentional Yang-Baxter equation into its two-dimensional counterpart. In accordance with both representations, we find the corresponding linear-optical simulations, based on the highly efficient optical elements. Both the freedom degrees of photon polarization and location are utilized as the qubit basis, in which the unitary Yang-Baxter matrices are decomposed into combination of actions of basic optical elements.
[ { "version": "v1", "created": "Thu, 29 Nov 2007 12:53:30 GMT" }, { "version": "v2", "created": "Fri, 30 Nov 2007 00:16:51 GMT" }, { "version": "v3", "created": "Wed, 30 Apr 2008 03:51:32 GMT" } ]
2009-11-13T00:00:00
[ [ "Hu", "Shuang-Wei", "" ], [ "Hu", "Ming-Guang", "" ], [ "Xue", "Kang", "" ], [ "Ge", "Mo-Lin", "" ] ]
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711.4704
Bastiaan A.H. Huisman
B.A.H. Huisman, P.G. Bolhuis, A. Fasolino
Phase transition to bundles of flexible supramolecular polymers
null
null
10.1103/PhysRevLett.100.188301
null
cond-mat.soft cond-mat.stat-mech
null
We report Monte Carlo simulations of the self-assembly of supramolecular polymers based on a model of patchy particles. We find a first-order phase transition, characterized by hysteresis and nucleation, toward a solid bundle of polymers, of length much greater than the average gas phase length. We argue that the bundling transition is the supramolecular equivalent of the sublimation transition, that results from a weak chain-chain interaction. We provide a qualitative equation of state that gives physical insight beyond the specific values of the parameters used in our simulations.
[ { "version": "v1", "created": "Thu, 29 Nov 2007 13:04:36 GMT" } ]
2009-11-13T00:00:00
[ [ "Huisman", "B. A. H.", "" ], [ "Bolhuis", "P. G.", "" ], [ "Fasolino", "A.", "" ] ]
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711.4705
Hendrik Weimer
Hendrik Weimer and G\"unter Mahler
Cavity-induced temperature control of a two-level system
null
Phys. Rev. A 76, 053819 (2007)
10.1103/PhysRevA.76.053819
null
quant-ph
null
We consider a two-level atom interacting with a single mode of the electromagnetic field in a cavity within the Jaynes-Cummings model. Initially, the atom is thermal while the cavity is in a coherent state. The atom interacts with the cavity field for a fixed time. After removing the atom from the cavity and applying a laser pulse the atom will be in a thermal state again. Depending on the interaction time with the cavity field the final temperature can be varied over a large range. We discuss how this method can be used to cool the internal degrees of freedom of atoms and create heat baths suitable for studying thermodynamics at the nanoscale.
[ { "version": "v1", "created": "Thu, 29 Nov 2007 13:09:10 GMT" } ]
2007-11-30T00:00:00
[ [ "Weimer", "Hendrik", "" ], [ "Mahler", "Günter", "" ] ]
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711.4706
Alan G. B. Lauder
Alan G.B. Lauder
Ranks of elliptic curves over function fields
32 pages
null
null
null
math.NT math.AG
null
We present experimental evidence to support the widely held belief that one half of all elliptic curves have infinitely many rational points. The method used to gather this evidence is a refinement of an algorithm due to the author which is based upon rigid and crystalline cohomology.
[ { "version": "v1", "created": "Thu, 29 Nov 2007 13:33:48 GMT" } ]
2007-11-30T00:00:00
[ [ "Lauder", "Alan G. B.", "" ] ]
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711.4707
Anthony Ashton
Anthony C.L. Ashton
The Fundamental k-Form and Global Relations
Published in SIGMA (Symmetry, Integrability and Geometry: Methods and Applications) at http://www.emis.de/journals/SIGMA/
SIGMA 4 (2008), 033, 15 pages
10.3842/SIGMA.2008.033
null
math.AP math-ph math.MP
null
In [Proc. Roy. Soc. London Ser. A 453 (1997), no. 1962, 1411-1443] A.S. Fokas introduced a novel method for solving a large class of boundary value problems associated with evolution equations. This approach relies on the construction of a so-called global relation: an integral expression that couples initial and boundary data. The global relation can be found by constructing a differential form dependent on some spectral parameter, that is closed on the condition that a given partial differential equation is satisfied. Such a differential form is said to be fundamental [Quart. J. Mech. Appl. Math. 55 (2002), 457-479]. We give an algorithmic approach in constructing a fundamental k-form associated with a given boundary value problem, and address issues of uniqueness. Also, we extend a result of Fokas and Zyskin to give an integral representation to the solution of a class of boundary value problems, in an arbitrary number of dimensions. We present an extended example using these results in which we construct a global relation for the linearised Navier-Stokes equations.
[ { "version": "v1", "created": "Thu, 29 Nov 2007 13:28:54 GMT" }, { "version": "v2", "created": "Thu, 6 Dec 2007 11:53:33 GMT" }, { "version": "v3", "created": "Thu, 20 Mar 2008 07:21:09 GMT" } ]
2008-04-25T00:00:00
[ [ "Ashton", "Anthony C. L.", "" ] ]
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