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712.1179
Octavi Fors
A. Richichi, O. Fors, E. Mason, M. Delbo, J. Stegmaier, G. Finger
Life on the fast lane: the burst mode at the VLT at present and in the future
Contribution to the "The VLT in the ELT era" ESO workshop. Garching, October 2007
null
null
null
astro-ph
null
The recent implementation of the high-speed burst mode at the ISAAC instrument on UT1, and its propagation to other ESO instruments, has opened the door to observational capabilities which hold the potential for a wealth of novel results. In the ELT era, when the accent will likely be on lengthy programs aimed at the best sensitivity and angular resolution, the VLT telescopes could continue to play a significant and largely unique role by performing routinely observations of transient events at high temporal resolution. In our contribution, we provide details on two such kinds of observations, namely lunar occultations of stars and of asteroids. For the first ones, we report on two passages of the Moon in regions with high stellar density as the Galactic Center. The VLT-UT1 telescope was used for the first time to record successfully 53 and 71 occultations on March 22 and August 6, 2006, with an angular resolution of 0.5-1 milliarcsecond and $K\sim12.5$ limiting magnitude. We note that the angular resolution is superior to that achieved at present by Adaptive Optics on any telescope, and also superior to that foreseen for the ELT at the same wavelength. LO are also very efficient in terms of telescope time. We present some of the results, including the discovery of close binaries, and the detection and study of compact circumstellar components of cool giants, AGB stars and embedded IR sources. Rest of the abstract follows at the paper
[ { "version": "v1", "created": "Fri, 7 Dec 2007 17:25:56 GMT" } ]
2007-12-10T00:00:00
[ [ "Richichi", "A.", "" ], [ "Fors", "O.", "" ], [ "Mason", "E.", "" ], [ "Delbo", "M.", "" ], [ "Stegmaier", "J.", "" ], [ "Finger", "G.", "" ] ]
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712.118
R. M. Kiehn
R. M. Kiehn
Part I. The Cosmological Vacuum from a Topological Perspective
70 pages, 5 figures
null
null
null
gr-qc
null
This article examines how the physical presence of field energy and particulate matter can be interpreted in terms of the topological properties of space-time. The theory is developed in terms of vector and matrix equations of exterior differential systems, which are not constrained by tensor diffeomorphic equivalences. The first postulate defines the field properties (a vector space continuum) of the Cosmological Vacuum in terms of matrices of basis functions that map exact differentials into neighborhoods of exterior differential 1-forms (potentials). The second postulate requires that the field equations must satisfy the First Law of Thermodynamics dynamically created in terms of the Lie differential with respect to a process direction field acting on the exterior differential forms that encode the thermodynamic system. The vector space of infinitesimals need not be global and its compliment is used to define particle properties as topological defects embedded in the field vector space. The potentials, as exterior differential 1-forms, are not (necessarily) uniquely integrable: the fibers can be twisted, leading to possible Chiral matrix arrays of certain 3-forms defined as Topological Torsion and Topological Spin. A significant result demonstrates how the coefficients of Affine Torsion are related to the concept of Field excitations (mass and charge); another demonstrates how thermodynamic evolution can describe the emergence of topological defects in the physical vacuum.
[ { "version": "v1", "created": "Fri, 7 Dec 2007 16:30:57 GMT" } ]
2007-12-10T00:00:00
[ [ "Kiehn", "R. M.", "" ] ]
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712.1181
Petros Aslanyan Dr.
P.Zh.Aslanyan, V.N.Emelyanenko
Searches for Multibaryon States with $\Lambda$ Hyperon Systems in pa Collision at 10 Gev/c
8 pages, 9 figures, Proc. XII International Conference on Hadron Spectroscopy, Frascati, INFN, 8-12 October,2007
null
null
null
hep-ex
null
Experimental data as a stereo photographs from the 2m propane bubble chamber LHE, JINR have been analyzed for exotic multibaryon metastable and stable states searches. A number of peculiarities were found in the effective mass spectra of: 1)$\Lambda \pi^{\pm}$,$\Lambda \pi^+ \pi^-$, $\Lambda p$, $\Lambda p p$, $\Lambda \pi p$,$\Lambda \Lambda $ and $\Lambda K^0_S$ subsystems. The observed well known $\Sigma^{*+}$(1385),$\Lambda ^*(1600)$ and $K^{*\pm}$(892)resonances are good tests for this method. The width of $\Sigma^{*-}(1385)$ for p+A reaction is two time larger than that presented in PDG. The $\Lambda \pi^-$ spectrum observed enhancement in mass range of 1345 MeV/$c^2$ which interpreted as a stopped in nucleus $\Xi^-$. The cross section of stopped $\Xi^-$ production is $\approx$ 8 times larger than obtained by fritiof model with same experimental conditions.
[ { "version": "v1", "created": "Fri, 7 Dec 2007 16:32:56 GMT" }, { "version": "v2", "created": "Tue, 22 Jan 2008 08:38:26 GMT" } ]
2008-01-22T00:00:00
[ [ "Aslanyan", "P. Zh.", "" ], [ "Emelyanenko", "V. N.", "" ] ]
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712.1182
Audun Josang
Audun Josang
Cumulative and Averaging Fission of Beliefs
7 pages, 4 figures, working paper
null
null
null
cs.AI cs.LO
null
Belief fusion is the principle of combining separate beliefs or bodies of evidence originating from different sources. Depending on the situation to be modelled, different belief fusion methods can be applied. Cumulative and averaging belief fusion is defined for fusing opinions in subjective logic, and for fusing belief functions in general. The principle of fission is the opposite of fusion, namely to eliminate the contribution of a specific belief from an already fused belief, with the purpose of deriving the remaining belief. This paper describes fission of cumulative belief as well as fission of averaging belief in subjective logic. These operators can for example be applied to belief revision in Bayesian belief networks, where the belief contribution of a given evidence source can be determined as a function of a given fused belief and its other contributing beliefs.
[ { "version": "v1", "created": "Fri, 7 Dec 2007 16:42:07 GMT" } ]
2007-12-10T00:00:00
[ [ "Josang", "Audun", "" ] ]
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712.1183
Leonid Rybnikov
Boris Feigin, Edward Frenkel, Leonid Rybnikov
Opers with irregular singularity and spectra of the shift of argument subalgebra
19 pages
Duke Math. J. 155, no. 2 (2010), 337-363
10.1215/00127094-2010-057
null
math.QA math-ph math.AG math.MP
null
The universal enveloping algebra of any simple Lie algebra g contains a family of commutative subalgebras, called the quantum shift of argument subalgebras math.RT/0606380, math.QA/0612798. We prove that generically their action on finite-dimensional modules is diagonalizable and their joint spectra are in bijection with the set of monodromy-free opers for the Langlands dual group of G on the projective line with regular singularity at one point and irregular singularity of order two at another point. We also prove a multi-point generalization of this result, describing the spectra of commuting Hamiltonians in Gaudin models with irregular singulairity. In addition, we show that the quantum shift of argument subalgebra corresponding to a regular nilpotent element of g has a cyclic vector in any irreducible finite-dimensional g-module. As a byproduct, we obtain the structure of a Gorenstein ring on any such module. This fact may have geometric significance related to the intersection cohomology of Schubert varieties in the affine Grassmannian.
[ { "version": "v1", "created": "Fri, 7 Dec 2007 16:44:13 GMT" }, { "version": "v2", "created": "Fri, 25 Jan 2008 02:44:44 GMT" } ]
2019-12-19T00:00:00
[ [ "Feigin", "Boris", "" ], [ "Frenkel", "Edward", "" ], [ "Rybnikov", "Leonid", "" ] ]
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712.1184
George Heald
George Heald (1) and Tom Oosterloo (1,2) ((1) ASTRON (2) Kapteyn Astronomical Institute)
Anomalous HI Gas in NGC 4395: Signs of Gas Accretion
To appear in the proceedings of "Formation and Evolution of Galaxy Disks", Rome 1-5 October 2007. Editors Jose G. Funes, S.J. and Enrico M. Corsini
null
null
null
astro-ph
null
In recent years, it has become clear that large quantities of gas reside in the halos of many spiral galaxies. Whether the presence of this gas is ultimately a consequence of star formation activity in the disk, or accretion from outside of the galaxy, is not yet understood. We present new, deep HI observations of NGC 4395 as part of a continuing observational program to investigate this issue. We have detected a number of gas clouds with masses and sizes similar to Milky Way HVCs. Some of these are in regions without currently ongoing star formation, possibly indicating ongoing gas accretion.
[ { "version": "v1", "created": "Fri, 7 Dec 2007 16:45:44 GMT" } ]
2007-12-10T00:00:00
[ [ "Heald", "George", "" ], [ "Oosterloo", "Tom", "" ] ]
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712.1185
A. Lobel
A. Lobel (Royal Observatory of Belgium)
SpectroWeb: Oscillator Strength Measurements of Atomic Absorption Lines in the Sun and Procyon
6 pages, 7 figures. To appear in Proc. of the 9th Int. Coll. on Atomic Spectra and Oscillator Strengths for Astrophysical and Laboratory Plasmas at Lund, Sweden, August 7-10, 2007. The Journal of Physics: Conf. Series (JPCS), (The Institute of Physics Publ., UK). The SpectroWeb database is available at http://spectra.freeshell.org
J.Phys.Conf.Ser.130:012015,2008
10.1088/1742-6596/130/1/012015
null
astro-ph
null
We update the online SpectroWeb database of spectral standard reference stars with 1178 oscillator strength values of atomic absorption lines observed in the optical spectrum of the Sun and Procyon (Alpha CMi A). The updated line oscillator strengths are measured with best fits to the disk-integrated KPNO-FTS spectrum of the Sun observed between 4000 A and 6800 A using state-of-the-art detailed spectral synthesis calculations. A subset of 660 line oscillator strengths is validated with synthetic spectrum calculations of Procyon observed with ESO-UVES between 4700 A and 6800 A. The new log(gf)-values in SpectroWeb are improved over the values offered in the online Vienna Atomic Line Database (VALD). We find for neutral iron-group elements, such as Fe I, Ni I, Cr I, and Ti I, a statistically significant over-estimation of the VALD log(gf)-values for weak absorption lines with normalized central line depths below 15 %. For abundant lighter elements (e.g. Mg I and Ca I) this trend is statistically not significantly detectable, with the exception of Si I for which the log(gf)-values of 60 weak and medium-strong lines are substantially decreased to best fit the observed spectra. The newly measured log(gf)-values are available in the SpectroWeb database at http://spectra.freeshell.org which interactively displays the observed and computed stellar spectra, together with corresponding atomic line data.
[ { "version": "v1", "created": "Fri, 7 Dec 2007 16:45:35 GMT" } ]
2008-12-18T00:00:00
[ [ "Lobel", "A.", "", "Royal Observatory of Belgium" ] ]
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712.1186
Colin Wilkin
V.Kurbatov, M.Buescher, S.Dymov, D.Gusev, M.Hartmann, A.Kacharava, A.Khoukaz, V.Komarov, A.Kulikov, G.Macharashvili, T.Mersmann, S.Merzliakov, S.Mikirtytchiants, D.Prasuhn, F.Rathmann, R.Schleichert, H.Stroeher, D.Tsirkov, Y.Uzikov, C.Wilkin, S.Yaschenko
Energy dependence of forward 1S0 diproton production in the pp -> pp pi0 reaction
12 pages, 4 figures
Phys.Lett.B661:22-27,2008
10.1016/j.physletb.2008.01.051
null
nucl-ex
null
The pp -> {pp}_s pi0 differential cross section has been measured with the ANKE spectrometer at COSY-Juelich for seven proton beam energies T_p between 0.5 and 1.97 GeV. By selecting proton pairs with an excitation energy of less than 3 MeV it is ensured that the final {pp}_s system is in the 1S0 state. In the measured region of theta_{pp}^{cm} < 18 deg, the data reveal a forward dip for T_p =< 1.4 GeV whereas a forward peaking is seen at 1.97 GeV. The energy dependence of the forward cross section shows a broad peak in the 0.6-0.8 GeV region, probably associated with Delta(1232) excitation, and a minimum at 1.4 GeV. Some of these features are similar to those observed for the spin-isospin partner reaction, pp -> d pi+. However, the ratio of the forward differential cross sections of the two reactions shows a significant suppression of single pion production associated with a spin--singlet final nucleon pair.
[ { "version": "v1", "created": "Fri, 7 Dec 2007 16:56:35 GMT" } ]
2008-11-26T00:00:00
[ [ "Kurbatov", "V.", "" ], [ "Buescher", "M.", "" ], [ "Dymov", "S.", "" ], [ "Gusev", "D.", "" ], [ "Hartmann", "M.", "" ], [ "Kacharava", "A.", "" ], [ "Khoukaz", "A.", "" ], [ "Komarov", "V.", "" ], [ "Kulikov", "A.", "" ], [ "Macharashvili", "G.", "" ], [ "Mersmann", "T.", "" ], [ "Merzliakov", "S.", "" ], [ "Mikirtytchiants", "S.", "" ], [ "Prasuhn", "D.", "" ], [ "Rathmann", "F.", "" ], [ "Schleichert", "R.", "" ], [ "Stroeher", "H.", "" ], [ "Tsirkov", "D.", "" ], [ "Uzikov", "Y.", "" ], [ "Wilkin", "C.", "" ], [ "Yaschenko", "S.", "" ] ]
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712.1187
Thomas Bing
Thomas J. Bing and Edward F. Redish
Symbolic Manipulators Affect Mathematical Mindsets
null
null
10.1119/1.2835053
null
physics.ed-ph
null
Symbolic calculators like Mathematica are becoming more commonplace among upper level physics students. The presence of such a powerful calculator can couple strongly to the type of mathematical reasoning students employ. It does not merely offer a convenient way to perform the computations students would have otherwise wanted to do by hand. This paper presents examples from the work of upper level physics majors where Mathematica plays an active role in focusing and sustaining their thought around calculation. These students still engage in powerful mathematical reasoning while they calculate but struggle because of the narrowed breadth of their thinking. Their reasoning is drawn into local attractors where they look to calculation schemes to resolve questions instead of, for example, mapping the mathematics to the physical system at hand. We model the influence of Mathematica as an integral part of the constant feedback that occurs in how students frame, and hence focus, their work.
[ { "version": "v1", "created": "Fri, 7 Dec 2007 16:57:24 GMT" } ]
2009-11-13T00:00:00
[ [ "Bing", "Thomas J.", "" ], [ "Redish", "Edward F.", "" ] ]
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712.1188
Christian Y. Cardall
Christian Y. Cardall (Oak Ridge National Laboratory and University of Tennessee, Knoxville)
Liouville equations for neutrino distribution matrices
17 pages. Version accepted for publication in Phys. Rev. D. Section II shortened; some changes in notation that mostly affect Section III through Subsubsec. IIIC2; revised argument and swapping of Subsubsections IIIC1 and IIIC2
Phys.Rev.D78:085017,2008
10.1103/PhysRevD.78.085017
null
astro-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The classical notion of a single-particle scalar distribution function or phase space density can be generalized to a matrix in order to accommodate superpositions of states of discrete quantum numbers, such as neutrino mass/flavor. Such a `neutrino distribution matrix' is thus an appropriate construct to describe a neutrino gas that may vary in space as well as time and in which flavor mixing competes with collisions. The Liouville equations obeyed by relativistic neutrino distribution matrices, including the spatial derivative and vacuum flavor mixing terms, can be explicitly but elegantly derived in two new ways: from a covariant version of the familiar simple model of flavor mixing, and from the Klein-Gordon equations satisfied by a quantum `density function' (mean value of paired quantum field operators). Associated with the latter derivation is a case study in how the joint position/momentum dependence of a classical gas (albeit with Fermi statistics) emerges from a formalism built on quantum fields.
[ { "version": "v1", "created": "Fri, 7 Dec 2007 16:58:24 GMT" }, { "version": "v2", "created": "Thu, 9 Oct 2008 20:38:21 GMT" } ]
2008-11-26T00:00:00
[ [ "Cardall", "Christian Y.", "", "Oak Ridge National Laboratory and University of\n Tennessee, Knoxville" ] ]
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712.1189
Olivier Zendra
Olivier Zendra (INRIA Lorraine - LORIA), Eric Jul (DIKU), Roland Ducournau (LIRMM), Etienne Gagnon, Richard E. Jones, Chandra Krintz (RACE LAB), Philippe Mulet, Jan Vitek (S3L)
Implementation, Compilation, Optimization of Object-Oriented Languages, Programs and Systems - Report on the Workshop ICOOOLPS'2007 at ECOOP'07
null
ECOOP 2007 Workshop Reader Springer (Ed.) (2008)
null
null
cs.PL cs.SE
null
ICOOOLPS'2007 was the second edition of the ECOOP-ICOOOLPS workshop. ICOOOLPS intends to bring researchers and practitioners both from academia and industry together, with a spirit of openness, to try and identify and begin to address the numerous and very varied issues of optimization. After a first successful edition, this second one put a stronger emphasis on exchanges and discussions amongst the participants, progressing on the bases set last year in Nantes. The workshop attendance was a success, since the 30-people limit we had set was reached about 2 weeks before the workshop itself. Some of the discussions (e.g. annotations) were so successful that they would required even more time than we were able to dedicate to them. That's one area we plan to further improve for the next edition.
[ { "version": "v1", "created": "Fri, 7 Dec 2007 17:01:52 GMT" } ]
2007-12-10T00:00:00
[ [ "Zendra", "Olivier", "", "INRIA Lorraine - LORIA" ], [ "Jul", "Eric", "", "DIKU" ], [ "Ducournau", "Roland", "", "LIRMM" ], [ "Gagnon", "Etienne", "", "RACE\n LAB" ], [ "Jones", "Richard E.", "", "RACE\n LAB" ], [ "Krintz", "Chandra", "", "RACE\n LAB" ], [ "Mulet", "Philippe", "", "S3L" ], [ "Vitek", "Jan", "", "S3L" ] ]
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712.119
Yannick Meurice
Yannick Meurice
How to control nonlinear effects in Binder cumulants
14 pages, 11 figs, references added, presentation modified
null
null
null
hep-lat cond-mat.stat-mech hep-th
null
We point out that ignoring nonlinear effects in finite size scaling may lead to errors in estimates of the critical temperature and Binder cumulants. We show that the order of magnitude of these effects can be estimated from data at relatively small volume. Using this estimate, we propose to use linear fits in increasingly small temperature regions as the volume is increased (rather than using a fixed temperature interval). The choice of the exact coefficient of proportionality can be optimized and reveals interesting crossing patterns among estimates. We show that the new procedure works very well for Dyson's hierarchical model. We discuss applications of the method for 3 dimensional spin models and finite temperature lattice gauge theories and comment on the nonlinear effects for existing calculations.
[ { "version": "v1", "created": "Fri, 7 Dec 2007 17:10:42 GMT" }, { "version": "v2", "created": "Wed, 12 Dec 2007 18:26:33 GMT" }, { "version": "v3", "created": "Thu, 21 Feb 2008 20:58:23 GMT" } ]
2008-02-21T00:00:00
[ [ "Meurice", "Yannick", "" ] ]
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712.1191
Nikolaj Thomas Zinner
N.T. Zinner and A.S. Jensen
Nuclear alpha-particle condensates: Definitions, occurrence conditions, and consequences
5 pages, revtex4 format. Final published version with date of submission, revision, and publication
Phys.Rev.C78:041306,2008
10.1103/PhysRevC.78.041306
null
nucl-th cond-mat.other
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
There has been a recent flurry of interest in the possibility of condensates of $\alpha$-particles in nuclei. In this letter we discuss occurrence conditions for such states. Using the quantality condition of Mottelson we show that condensates are only marginally expected in $\alpha$-particle states. We proceed to demonstrate that few-body nuclear condensates are ill-defined, and emphasize the conflict between $\alpha$-localization and $\alpha$-condensate formation. We also explore the connection between Ikeda diagrams, linear chains, and Tonks-Girardeau gases. Our findings show that no new information is contained in the approximations of nuclear states as $\alpha$-cluster condensates. Furthermore, condensates of more than three $\alpha$-particles are very unlikely to exist due to couplings to other degrees of freedom.
[ { "version": "v1", "created": "Fri, 7 Dec 2007 17:07:28 GMT" }, { "version": "v2", "created": "Wed, 19 Dec 2007 08:55:26 GMT" }, { "version": "v3", "created": "Tue, 15 Apr 2008 15:59:17 GMT" }, { "version": "v4", "created": "Wed, 5 Nov 2008 20:59:46 GMT" } ]
2008-11-26T00:00:00
[ [ "Zinner", "N. T.", "" ], [ "Jensen", "A. S.", "" ] ]
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712.1192
Teddy Cheung
C.C. Cheung, L. Stawarz, A. Siemiginowska, D.E Harris, D.A. Schwartz, J.F.C. Wardle, D. Gobeille, N.P. Lee
The Highest Redshift Relativistic Jets
5 pages, 2 figures, to appear in Extragalactic Jets: Theory and Observation from Radio to Gamma Ray, Eds. T.A. Rector and D.S. De Young
null
null
null
astro-ph
null
We describe our efforts to understand large-scale (10's-100's kpc) relativistic jet systems through observations of the highest-redshift quasars. Results from a VLA survey search for radio jets in ~30 z>3.4 quasars are described along with new Chandra observations of 4 selected targets.
[ { "version": "v1", "created": "Fri, 7 Dec 2007 17:08:53 GMT" } ]
2007-12-10T00:00:00
[ [ "Cheung", "C. C.", "" ], [ "Stawarz", "L.", "" ], [ "Siemiginowska", "A.", "" ], [ "Harris", "D. E", "" ], [ "Schwartz", "D. A.", "" ], [ "Wardle", "J. F. C.", "" ], [ "Gobeille", "D.", "" ], [ "Lee", "N. P.", "" ] ]
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712.1193
Anastasia Volovich
Antal Jevicki, Kewang Jin, Chrysostomos Kalousios, Anastasia Volovich
Generating AdS String Solutions
21 pages, 3 figures, references added
JHEP0803:032,2008
10.1088/1126-6708/2008/03/032
null
hep-th
null
We use a Pohlmeyer type reduction to generate classical string solutions in AdS spacetime. In this framework we describe a correspondence between spikes in AdS_3 and soliton profiles of the sinh-Gordon equation. The null cusp string solution and its closed spinning string counterpart are related to the sinh-Gordon vacuum. We construct classical string solutions corresponding to sinh-Gordon solitons, antisolitons and breathers by the inverse scattering technique. The breather solutions can also be reproduced by the sigma model dressing method.
[ { "version": "v1", "created": "Fri, 7 Dec 2007 17:10:33 GMT" }, { "version": "v2", "created": "Sun, 13 Jan 2008 03:06:09 GMT" } ]
2008-11-26T00:00:00
[ [ "Jevicki", "Antal", "" ], [ "Jin", "Kewang", "" ], [ "Kalousios", "Chrysostomos", "" ], [ "Volovich", "Anastasia", "" ] ]
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712.1194
Shiwei Zhang
Shiwei Zhang (W&M) and D. M. Ceperley (UIUC)
The Hartree-Fock ground state of the three-dimensional electron gas
4 pages, 4 figures
Phys. Rev. Lett. 100, 236404 (2008)
10.1103/PhysRevLett.100.236404
null
cond-mat.str-el cond-mat.other
null
In 1962, Overhauser showed that within Hartree-Fock (HF) the electron gas is unstable to a spin density wave (SDW) instability. Determining the true HF ground state has remained a challenge. Using numerical calculations for finite systems and analytic techniques, we study the HF ground state of the 3D electron gas. At high density, we find broken spin symmetry states with a nearly constant charge density. Unlike previously discussed spin wave states, the observed wave vector of the SDW is smaller than $2 k_F$. The broken-symmetry state originates from pairing instabilities at the Fermi surface, a model for which is proposed.
[ { "version": "v1", "created": "Fri, 7 Dec 2007 17:32:54 GMT" } ]
2008-06-13T00:00:00
[ [ "Zhang", "Shiwei", "", "W&M" ], [ "Ceperley", "D. M.", "", "UIUC" ] ]
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712.1195
Ted Rogers
T. C. Rogers
Parton correlation functions and factorization in deep inelastic scattering
Talk given at the 8th International Symposium on Radiative Corrections
PoSRADCOR2007:031,2007
null
null
hep-ph
null
We outline the basic properties of a pertubative QCD factorization formalism that maintains exact over-all kinematics in both the initial and final states. Such a treatment requires the use of non-perturbative factors that depend on all components of parton four-momentum. These objects are referred to as parton correlation functions. We describe the complications faced in defining parton correlation functions and discuss recent progress. Emphasis is placed on the need for precise operator definitions in a complete derivation of factorization.
[ { "version": "v1", "created": "Fri, 7 Dec 2007 17:43:57 GMT" } ]
2008-11-26T00:00:00
[ [ "Rogers", "T. C.", "" ] ]
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712.1196
Eva Silverstein
Eva Silverstein
Simple de Sitter Solutions
37 pages, harvmac big, 4 figures. v3: small corrections
Phys.Rev.D77:106006,2008
10.1103/PhysRevD.77.106006
SLAC-PUB-13016, SITP-07/20
hep-th
null
We present a framework for de Sitter model building in type IIA string theory, illustrated with specific examples. We find metastable dS minima of the potential for moduli obtained from a compactification on a product of two Nil three-manifolds (which have negative scalar curvature) combined with orientifolds, branes, fractional Chern-Simons forms, and fluxes. As a discrete quantum number is taken large, the curvature, field strengths, inverse volume, and four dimensional string coupling become parametrically small, and the de Sitter Hubble scale can be tuned parametrically smaller than the scales of the moduli, KK, and winding mode masses. A subtle point in the construction is that although the curvature remains consistently weak, the circle fibers of the nilmanifolds become very small in this limit (though this is avoided in illustrative solutions at modest values of the parameters). In the simplest version of the construction, the heaviest moduli masses are parametrically of the same order as the lightest KK and winding masses. However, we provide a method for separating these marginally overlapping scales, and more generally the underlying supersymmetry of the model protects against large corrections to the low-energy moduli potential.
[ { "version": "v1", "created": "Fri, 7 Dec 2007 19:30:08 GMT" }, { "version": "v2", "created": "Sun, 9 Dec 2007 04:26:35 GMT" }, { "version": "v3", "created": "Mon, 14 Jan 2008 03:29:41 GMT" }, { "version": "v4", "created": "Tue, 18 Mar 2008 00:25:22 GMT" } ]
2008-11-26T00:00:00
[ [ "Silverstein", "Eva", "" ] ]
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712.1197
Antonio Pic\'on
Gabriel F. Calvo and Antonio Pic\'on
Manipulation of single-photon states encoded in transverse spatial modes: possible and impossible tasks
Published in PRA
Phys. Rev. A 77, 012302 (2008)
10.1103/PhysRevA.77.012302
null
quant-ph physics.optics
null
Controlled generation and manipulation of photon states encoded in their spatial degrees of freedom is a crucial ingredient in many quantum information tasks exploiting higher-than-two dimensional encoding. Here, we prove the impossibility to arbitrarily modify $d$-level state superpositions (qu$d$its) for $d>2$, encoded in the transverse modes of light, with optical components associated to the group of symplectic transforms (Gaussian operations). Surprisingly, we also provide an explicit construction of how non-Gaussian operations acting on mode subspaces do enable to overcome the limit $d=2$. In addition, this set of operations realizes the full SU(3) algebra.
[ { "version": "v1", "created": "Fri, 7 Dec 2007 18:02:19 GMT" }, { "version": "v2", "created": "Mon, 11 Feb 2008 09:22:11 GMT" } ]
2011-02-08T00:00:00
[ [ "Calvo", "Gabriel F.", "" ], [ "Picón", "Antonio", "" ] ]
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712.1198
Mauro Mariani
Giovanni Bellettini, Lorenzo Bertini, Mauro Mariani, Matteo Novaga
Gamma-entropy cost for scalar conservation laws
38 pages, 1 figure
null
null
null
math.AP math.FA
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We are concerned with a control problem related to the vanishing viscosity approximation to scalar conservation laws. We investigate the $\Gamma$-convergence of the control cost functional, as the viscosity coefficient tends to zero. A first order $\Gamma$-limit is established, which characterizes the measure-valued solutions to the conservation laws as the zeros of the $\Gamma$-limit. A second order $\Gamma$-limit is then investigated, providing a characterization of entropic solutions to conservation laws as the zeros of the $\Gamma$-limit.
[ { "version": "v1", "created": "Fri, 7 Dec 2007 18:15:28 GMT" }, { "version": "v2", "created": "Mon, 8 Sep 2008 18:44:11 GMT" } ]
2008-09-08T00:00:00
[ [ "Bellettini", "Giovanni", "" ], [ "Bertini", "Lorenzo", "" ], [ "Mariani", "Mauro", "" ], [ "Novaga", "Matteo", "" ] ]
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712.1199
Andrzej Si\'odmok
Stefan Gieseke, Michael H. Seymour, Andrzej Siodmok
A model of non-perturbative gluon emission in an initial state parton shower
14 pages, 6 figures; version accepted by JHEP
JHEP 0806:001,2008
10.1088/1126-6708/2008/06/001
CERN-PH-TH/2007-240, KA-TP-31-2007
hep-ph
null
We consider a model of transverse momentum production in which non-perturbative smearing takes place throughout the perturbative evolution, by a simple modification to an initial state parton shower algorithm. Using this as the important non-perturbative ingredient, we get a good fit to data over a wide range of energy. Combining it with the non-perturbative masses and cutoffs that are a feature of conventional parton showers also leads to a reasonable fit. We discuss the extrapolation to the LHC.
[ { "version": "v1", "created": "Fri, 7 Dec 2007 18:59:39 GMT" }, { "version": "v2", "created": "Mon, 17 Dec 2007 14:46:58 GMT" }, { "version": "v3", "created": "Tue, 27 May 2008 14:46:11 GMT" } ]
2009-02-18T00:00:00
[ [ "Gieseke", "Stefan", "" ], [ "Seymour", "Michael H.", "" ], [ "Siodmok", "Andrzej", "" ] ]
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712.12
Jean-Christophe Leyder
Jean-Christophe Leyder, Roland Walter, Michalis Lazos, Nicolas Masetti, and Nicolas Produit
Hard X-ray flares in IGR J08408-4503 unveil clumpy stellar winds
5 pages with 5 figures. Published as a Letter in Astronomy & Astrophysics
Astron.Astrophys.465:L35-L38,2007
10.1051/0004-6361:20066317
null
astro-ph
null
Context : A 1000-s flare from a new hard X-ray transient, IGR J08408-4503, was observed by INTEGRAL on May 15, 2006 during the real-time routine monitoring of IBIS/ISGRI images performed at the INTEGRAL Science Data Centre. The flare, detected during a single one-hour long pointing, peaked at 250 mCrab in the 20-40 keV energy range. Aims : Multi-wavelength observations, combining high-energy and optical data, were used to unveil the nature of IGR J08408-4503. Methods : A search in all INTEGRAL public data for other bursts from IGR J08408-4503 was performed, and the detailed analysis of another major flare is presented. The results of two Swift Target of Opportunity observations are also described. Finally, a study of the likely optical counterpart, HD 74194, is provided. Results : IGR J08408-4503 is very likely a supergiant fast X-ray transient (SFXT) system. The system parameters indicate that the X-ray flares are probably related to the accretion of wind clumps on a compact object orbiting about 1E13 cm from the supergiant HD 74194. The clump mass loss rate is of the order of 1E-6 solar mass/yr. Conclusions : Hard X-ray flares from SFXTs allow to probe the stellar winds of massive stars, and could possibly be associated with wind perturbations due to line-driven instabilities.
[ { "version": "v1", "created": "Fri, 7 Dec 2007 18:27:11 GMT" } ]
2009-06-25T00:00:00
[ [ "Leyder", "Jean-Christophe", "" ], [ "Walter", "Roland", "" ], [ "Lazos", "Michalis", "" ], [ "Masetti", "Nicolas", "" ], [ "Produit", "Nicolas", "" ] ]
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712.1201
Michael Creutz
Michael Creutz
Four-dimensional graphene and chiral fermions
10 pages, 1 figure. Revision adds more references and adds minor clarifications. Version to appear in JHEP
JHEP0804:017,2008
10.1088/1126-6708/2008/04/017
null
hep-lat cond-mat.other
null
Motivated by the description of the graphene electronic structure in terms of the relativistic Dirac equation, a generalization to four dimensions yields a strictly local fermion action describing two species and possessing an exact chiral symmetry. This is the minimum number of species required by the well known ``no-go'' theorems.
[ { "version": "v1", "created": "Fri, 7 Dec 2007 18:30:36 GMT" }, { "version": "v2", "created": "Sun, 16 Dec 2007 14:21:10 GMT" }, { "version": "v3", "created": "Thu, 7 Feb 2008 22:14:43 GMT" }, { "version": "v4", "created": "Sat, 15 Mar 2008 15:42:33 GMT" }, { "version": "v5", "created": "Tue, 25 Mar 2008 17:15:52 GMT" } ]
2008-11-26T00:00:00
[ [ "Creutz", "Michael", "" ] ]
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712.1202
Olga Vega Dr
O. Vega (1,2), M.S. Clemens (2), A. Bressan (1,2,3), G.L. Granato (2), L. Silva (4) and P. Panuzzo (2,5)--((1)INAOE, (2)INAF-Padova, (3)SISSA, (4)INAF-Trieste, (5)CEA/DSM - CNRS)
Modelling the spectral energy distribution of ULIRGs II: The energetic environment and the dense interstellar medium
Re-submitted to A&A
null
10.1051/0004-6361:20078883
null
astro-ph
null
We fit the near-infrared to radio spectral energy distributions of 30 luminous and ultra-luminous infrared galaxies with pure starburst models or models that include both starburst and AGN components to determine important physical parameters for this population of objects. In particular we constrain the optical depth towards the luminosity source, the star formation rate, the star formation efficiency and the AGN fraction. We find that although about half of our sample have best-fit models that include an AGN component, only 30% have an AGN which accounts for more than 10% of the infrared luminosity, whereas all have an energetically dominant starburst. Our derived AGN fractions are generally in good agreement other measurements based in the mid-infrared line ratios measured by Spitzer IRS, but lower than those derived from PAH equivalent widths or the mid-infrared spectral slope. Our models determine the mass of dense molecular gas via the extinction required to reproduce the SED. Assuming that this mass is that traced by HCN, we reproduce the observed linear relation between HCN and infrared luminosities found by Gao & Solomon. We also find that the star formation efficiency, defined as the current star formation rate per unit of dense molecular gas mass, is enhanced in the ULIRGs phase. If the evolution of ULIRGs includes a phase in which an AGN contributes an important fraction to the infrared luminosity, this phase should last an order of magnitude less time than the starburst phase. Because the mass of dense molecular gas which we derive is consistent with observations of the HCN molecule,it should be possible to estimate the mass of dense, star-forming molecular gas in such objects when molecular line data are not available.
[ { "version": "v1", "created": "Fri, 7 Dec 2007 18:34:47 GMT" } ]
2009-11-13T00:00:00
[ [ "Vega", "O.", "" ], [ "Clemens", "M. S.", "" ], [ "Bressan", "A.", "" ], [ "Granato", "G. L.", "" ], [ "Silva", "L.", "" ], [ "Panuzzo", "P.", "" ], [ "--", "", "" ] ]
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712.1203
Damian Swift
Damian C. Swift, Richard G. Kraus
On the Properties of Plastic Ablators in Laser-Driven Material Dynamics Experiments
Typos fixed
Physical Review E, vol 77, 066402 (2008)
10.1103/PhysRevE.77.066402
UCRL-JRNL-236641
cond-mat.other cond-mat.mtrl-sci
null
Radiation hydrodynamics simulations were used to study the effect of plastic ablators in laser-driven shock experiments. The sensitivity to composition and equation of state was found to be 5-10% in ablation pressure. As was found for metals, a laser pulse of constant irradiance gave a pressure history which decreased by several percent per nanosecond. The pressure history could be made more constant by adjusting the irradiance history. The impedance mismatch with the sample gave an increase o(100%) in the pressure transmitted into the sample, for a reduction of several tens of percent in the duration of the peak load applied to the sample, and structured the release history by adding a release step to a pressure close to the ablation pressure. Algebraic relations were found between the laser pulse duration, the ablator thickness, and the duration of the peak pressure applied to the sample, involving quantities calculated from the equations of state of the ablator and sample using shock dynamics.
[ { "version": "v1", "created": "Fri, 7 Dec 2007 18:48:08 GMT" }, { "version": "v2", "created": "Sun, 6 Apr 2008 05:39:06 GMT" }, { "version": "v3", "created": "Wed, 4 Jun 2008 07:54:07 GMT" } ]
2009-11-13T00:00:00
[ [ "Swift", "Damian C.", "" ], [ "Kraus", "Richard G.", "" ] ]
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712.1204
Petja Salmi
P. Salmi, A. Achucarro, E. J. Copeland, T. W. B. Kibble, R. de Putter, and D. A. Steer
Kinematic Constraints on Formation of Bound States of Cosmic Strings - Field Theoretical Approach
6 pages, 12 eps figures - matches the published version
Phys.Rev.D77:041701,2008
10.1103/PhysRevD.77.041701
Imperial/TP/07/TK/01
hep-th astro-ph hep-ph
null
Superstring theory predicts the potential formation of string networks with bound states ending in junctions. Kinematic constraints for junction formation have been derived within the Nambu-Goto thin string approximation. Here we test these constraints numerically in the framework of the Abelian-Higgs model in the Type-I regime and report on good agreement with the analytical predictions. We also demonstrate that strings can effectively pass through each other when they meet at speeds slightly above the critical velocity permitting bound state formation. This is due to reconnection effects that are beyond the scope of the Nambu-Goto approximation.
[ { "version": "v1", "created": "Fri, 7 Dec 2007 18:53:36 GMT" }, { "version": "v2", "created": "Tue, 26 Feb 2008 21:23:56 GMT" } ]
2008-11-26T00:00:00
[ [ "Salmi", "P.", "" ], [ "Achucarro", "A.", "" ], [ "Copeland", "E. J.", "" ], [ "Kibble", "T. W. B.", "" ], [ "de Putter", "R.", "" ], [ "Steer", "D. A.", "" ] ]
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712.1205
James Riely
Radha Jagadeesan, Alan Jeffrey, Corin Pitcher, James Riely
Lambda-RBAC: Programming with Role-Based Access Control
LMCS
Logical Methods in Computer Science, Volume 4, Issue 1 (January 9, 2008) lmcs:1195
10.2168/LMCS-4(1:2)2008
null
cs.PL cs.CR
null
We study mechanisms that permit program components to express role constraints on clients, focusing on programmatic security mechanisms, which permit access controls to be expressed, in situ, as part of the code realizing basic functionality. In this setting, two questions immediately arise: (1) The user of a component faces the issue of safety: is a particular role sufficient to use the component? (2) The component designer faces the dual issue of protection: is a particular role demanded in all execution paths of the component? We provide a formal calculus and static analysis to answer both questions.
[ { "version": "v1", "created": "Fri, 7 Dec 2007 18:58:35 GMT" }, { "version": "v2", "created": "Wed, 9 Jan 2008 16:51:45 GMT" } ]
2015-07-01T00:00:00
[ [ "Jagadeesan", "Radha", "" ], [ "Jeffrey", "Alan", "" ], [ "Pitcher", "Corin", "" ], [ "Riely", "James", "" ] ]
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712.1206
Bhaskar Dutta
Bhaskar Dutta, Yukihiro Mimura and Rabindra Mohapatra
Proton Decay and Flavor Violating Thresholds in SO(10) Models
5 pages, 1 figure
Phys.Rev.Lett.100:181801,2008
10.1103/PhysRevLett.100.181801
MIFP-07-32
hep-ph
null
Discovery of neutrino mass has put the spotlight on supersymmetric SO(10) as a natural candidate for grand unification of forces and matter. However, the suppression of proton decay is a major problem in any supersymmetric grand unified models. In this paper we show how to alleviate this problem by simple threshold effect which raises the colored Higgsino masses and the grand unification scale to \gtrsim 10^{17} GeV. There exist only four types of fields arising from different SO(10) representations which can generate this kind of threshold effects. Some of these fields also generate a sizable flavor violation in the quark sector compared to the lepton sector. The b-\tau unification can work in these types of models even for intermediate values of tan\beta.
[ { "version": "v1", "created": "Fri, 7 Dec 2007 19:07:01 GMT" } ]
2008-11-26T00:00:00
[ [ "Dutta", "Bhaskar", "" ], [ "Mimura", "Yukihiro", "" ], [ "Mohapatra", "Rabindra", "" ] ]
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712.1207
Petr Navratil
P. Navratil, V. G. Gueorguiev, J. P. Vary, W. E. Ormand, A. Nogga and S. Quaglioni
Light nuclei from chiral EFT interactions
6 pages, 6 figures, proceedings of the 20th European Conference on Few-Body Problems in Physics (EFB20)
Few Body Syst.43:129-135,2008
10.1007/s00601-008-0221-y
UCRL-PROC-236880
nucl-th
null
Recent developments in nuclear theory allow us to make a connection between quantum chromodynamics (QCD) and low-energy nuclear physics. First, chiral effective field theory (chiEFT) provides a natural hierarchy to define two-nucleon (NN), three-nucleon (NNN), and even four-nucleon interactions. Second, ab initio methods have been developed capable to test these interactions for light nuclei. In this contribution, we discuss ab initio no-core shell model (NCSM) calculations for s-shell and p-shell nuclei with NN and NNN interactions derived within chiEFT.
[ { "version": "v1", "created": "Fri, 7 Dec 2007 19:07:36 GMT" } ]
2009-01-08T00:00:00
[ [ "Navratil", "P.", "" ], [ "Gueorguiev", "V. G.", "" ], [ "Vary", "J. P.", "" ], [ "Ormand", "W. E.", "" ], [ "Nogga", "A.", "" ], [ "Quaglioni", "S.", "" ] ]
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712.1208
Denes Petz
Paolo Gibilisco, Fumio Hiai, Denes Petz
Quantum covariance, quantum Fisher information and the uncertainty principle
null
null
null
null
math-ph math.MP
null
In this paper the relation between quantum covariances and quantum Fisher informations are studied. This study is applied to generalize a recently proved uncertainty relation based on quantum Fisher information. The proof given hereconsiderably simplifies the previously proposed proofs and leads to more general inequalities.
[ { "version": "v1", "created": "Fri, 7 Dec 2007 19:02:11 GMT" } ]
2007-12-10T00:00:00
[ [ "Gibilisco", "Paolo", "" ], [ "Hiai", "Fumio", "" ], [ "Petz", "Denes", "" ] ]
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712.1209
Gabriele Veneziano
D. Amati, M. Ciafaloni, G. Veneziano
Towards an S-matrix Description of Gravitational Collapse
39 pages, 5 figures; added discussion sect. 7, added references, acknowledgements
JHEP0802:049,2008
10.1088/1126-6708/2008/02/049
CERN-PH-TH/2007-254
hep-th
null
Extending our previous results on trans-Planckian ($Gs \gg \hbar$) scattering of light particles in quantum string-gravity we present a calculation of the corresponding S-matrix from the region of large impact parameters ($b \gg G\sqrt{s}>\lambda_s$) down to the regime where classical gravitational collapse is expected to occur. By solving the semiclassical equations of a previously introduced effective-action approximation, we find that the perturbative expansion around the leading eikonal result diverges at a critical value $b = b_c = O(G\sqrt{s})$, signalling the onset of a new (black-hole related?) regime. We then discuss the main features of our explicitly unitary S-matrix -- and of the associated effective metric -- down to (and in the vicinity of) $b = b_c$, and present some ideas and results on its extension all the way to the $ b \to 0$ region. We find that for $b<b_c$ the physical field solutions are complex-valued and the S-matrix shows additional absorption, related to a new production mechanism. The field solutions themselves are, surprisingly, everywhere regular, suggesting a quantum-tunneling -- rather than a singular-geometry -- situation.
[ { "version": "v1", "created": "Fri, 7 Dec 2007 19:08:03 GMT" }, { "version": "v2", "created": "Mon, 10 Dec 2007 08:48:20 GMT" }, { "version": "v3", "created": "Thu, 20 Dec 2007 18:11:39 GMT" } ]
2008-11-26T00:00:00
[ [ "Amati", "D.", "" ], [ "Ciafaloni", "M.", "" ], [ "Veneziano", "G.", "" ] ]
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712.121
Jorge Alfaro
Jorge Alfaro and Pablo Gonz\'alez
Velocity and Distribution of Primordial Neutrinos
16 pages, latex, 7 figures
Int.J.Mod.Phys.D17:2171-2187,2008
10.1142/S0218271808013789
null
astro-ph
null
The Cosmic Neutrinos Background (\textbf{CNB}) are Primordial Neutrinos decoupled when the Universe was very young. Its detection is complicated, especially if we take into account neutrino mass and a possible breaking of Lorentz Invariance at high energy, but has a fundamental relevance to study the Big-Bang. In this paper, we will see that a Lorentz Violation does not produce important modification, but the mass does. We will show how the neutrinos current velocity, with respect to comobile system to Universe expansion, is of the order of 1065 $[\frac{km}{s}]$, much less than light velocity. Besides, we will see that the neutrinos distribution is complex due to Planetary motion. This prediction differs totally from the usual massless case, where we would get a correction similar to the Dipolar Moment of the \textbf{CMB}.
[ { "version": "v1", "created": "Fri, 7 Dec 2007 19:09:21 GMT" } ]
2009-02-11T00:00:00
[ [ "Alfaro", "Jorge", "" ], [ "González", "Pablo", "" ] ]
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712.1211
Anargyros Papageorgiou
A. Papageorgiou and J. F. Traub
Quantum Algorithms and Complexity for Continuous Problems
32 pages, 2 figures
null
null
null
quant-ph
null
Most continuous mathematical formulations arising in science and engineering can only be solved numerically and therefore approximately. We shall always assume that we're dealing with a numerical approximation to the solution. There are two major motivations for studying quantum algorithms and complexity for continuous problems. 1. Are quantum computers more powerful than classical computers for important scientific problems? How much more powerful? 2. Many important scientific and engineering problems have continuous formulations. To answer the first question we must know the classical computational complexity of the problem. Knowing the classical complexity of a continuous problem we obtain the quantum computation speedup if we know the quantum complexity. If we know an upper bound on the quantum complexity through the cost of a particular quantum algorithm then we can obtain a lower bound on the quantum speedup. Regarding the second motivation, in this article we'll report on high-dimensional integration, path integration, Feynman path integration, the smallest eigenvalue of a differential equation, approximation, partial differential equations, ordinary differential equations and gradient estimation. We'll also briefly report on the simulation of quantum systems on a quantum computer.
[ { "version": "v1", "created": "Fri, 7 Dec 2007 19:10:51 GMT" } ]
2007-12-10T00:00:00
[ [ "Papageorgiou", "A.", "" ], [ "Traub", "J. F.", "" ] ]
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712.1212
Leandro Althaus
E. Garc\'ia--Berro, L. G. Althaus, A. H. C\'orsico, J. Isern
Gravitational settling of 22Ne and white dwarf evolution
To apper in The Astrophysical Journal
null
10.1086/527536
null
astro-ph
null
We study the effects of the sedimentation of the trace element 22Ne in the cooling of white dwarfs. In contrast with previous studies, which adopted a simplified treatment of the effects of 22Ne sedimentation, this is done self-consistently for the first time, using an up-to-date stellar evolutionary code in which the diffusion equation is coupled with the full set of equations of stellar evolution. Due the large neutron excess of 22Ne, this isotope rapidly sediments in the interior of the white dwarf. Although we explore a wide range of parameters, we find that using the most reasonable assumptions concerning the diffusion coefficient and the physical state of the white dwarf interior the delay introduced by the ensuing chemical differentation is minor for a typical 0.6 Msun white dwarf. For more massive white dwarfs, say M_Wd about 1.0 Msun, the delay turns out to be considerably larger. These results are in qualitatively good accord with those obtained in previous studies, but we find that the magnitude of the delay introduced by 22Ne sedimentation was underestimated by a factor of about 2. We also perform a preliminary study of the impact of 22Ne sedimentation on the white dwarf luminosity function. Finally, we hypothesize as well on the possibility of detecting the sedimentation of 22Ne using pulsating white dwarfs in the appropriate effective temperature range with accurately determined rates of change of the observed periods.
[ { "version": "v1", "created": "Fri, 7 Dec 2007 19:12:23 GMT" } ]
2009-11-13T00:00:00
[ [ "García--Berro", "E.", "" ], [ "Althaus", "L. G.", "" ], [ "Córsico", "A. H.", "" ], [ "Isern", "J.", "" ] ]
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712.1213
Andrea Gambassi
Andrea Gambassi
Relaxation phenomena at criticality
Talk delivered at Statphys23, Genova, Italy, July 9-13, 2007. 8 pages, 7 figures
Eur. Phys. J. B 64, 379-386 (2008)
10.1140/epjb/e2008-00043-y
null
cond-mat.stat-mech
null
The collective behaviour of statistical systems close to critical points is characterized by an extremely slow dynamics which, in the thermodynamic limit, eventually prevents them from relaxing to an equilibrium state after a change in the thermodynamic control parameters. The non-equilibrium evolution following this change displays some of the features typically observed in glassy materials, such as ageing, and it can be monitored via dynamic susceptibilities and correlation functions of the order parameter, the scaling behaviour of which is characterized by universal exponents, scaling functions, and amplitude ratios. This universality allows one to calculate these quantities in suitable simplified models and field-theoretical methods are a natural and viable approach for this analysis. In addition, if a statistical system is spatially confined, universal Casimir-like forces acting on the confining surfaces emerge and they build up in time when the temperature of the system is tuned to its critical value. We review here some of the theoretical results that have been obtained in recent years for universal quantities, such as the fluctuation-dissipation ratio, associated with the non-equilibrium critical dynamics, with particular focus on the Ising model with Glauber dynamics in the bulk. The non-equilibrium dynamics of the Casimir force acting in a film is discussed within the Gaussian model.
[ { "version": "v1", "created": "Fri, 7 Dec 2007 19:14:47 GMT" } ]
2009-07-13T00:00:00
[ [ "Gambassi", "Andrea", "" ] ]
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712.1214
Huey-Wen Lin
Huey-Wen Lin and Konstantinos Orginos
First Calculation of Hyperon Axial Couplings from Lattice QCD
5 pages, 2 figures
Phys.Rev.D79:034507,2009
10.1103/PhysRevD.79.034507
JLAB-THY-07-761
hep-lat
null
In this work, we report the first lattice calculation of hyperon axial couplings, using the 2+1-flavor MILC configurations and domain-wall fermion valence quarks. Both the $\Sigma$ and $\Xi$ axial couplings are computed for the first time in lattice QCD. In particular we find that $g_{\Sigma\Sigma} = 0.450(21)_{\rm stat}(27)_{\rm syst}$ and $g_{\Xi\Xi} = -0.277(15)_{\rm stat}(19)_{\rm syst}$.
[ { "version": "v1", "created": "Fri, 7 Dec 2007 19:15:44 GMT" } ]
2009-03-12T00:00:00
[ [ "Lin", "Huey-Wen", "" ], [ "Orginos", "Konstantinos", "" ] ]
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712.1215
Ruben Minasian
Agostino Butti, Davide Forcella, Luca Martucci, Ruben Minasian, Michela Petrini and Alberto Zaffaroni
On the geometry and the moduli space of beta-deformed quiver gauge theories
53 pages, 8 figures
JHEP 0807:053,2008
10.1088/1126-6708/2008/07/053
CERN-PH-TH/2007-235, BICOCCA-FT-07-16, SISSA 87/2007/EP, LMU-ASC 69/07
hep-th
null
We consider a class of super-conformal beta-deformed N=1 gauge theories dual to string theory on $AdS_5 \times X$ with fluxes, where $X$ is a deformed Sasaki-Einstein manifold. The supergravity backgrounds are explicit examples of Generalised Calabi-Yau manifolds: the cone over $X$ admits an integrable generalised complex structure in terms of which the BPS sector of the gauge theory can be described. The moduli spaces of the deformed toric N=1 gauge theories are studied on a number of examples and are in agreement with the moduli spaces of D3 and D5 static and dual giant probes.
[ { "version": "v1", "created": "Fri, 7 Dec 2007 19:32:36 GMT" } ]
2011-02-25T00:00:00
[ [ "Butti", "Agostino", "" ], [ "Forcella", "Davide", "" ], [ "Martucci", "Luca", "" ], [ "Minasian", "Ruben", "" ], [ "Petrini", "Michela", "" ], [ "Zaffaroni", "Alberto", "" ] ]
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712.1216
Kieran Holland
Kieran Holland, Michele Pepe, Uwe-Jens Wiese
Revisiting the deconfinement phase transition in SU(4) Yang-Mills theory in 2+1 dimensions
29 pages, 15 figures; v2: version published in JHEP, analysis section expanded
JHEP0802:041,2008
10.1088/1126-6708/2008/02/041
null
hep-lat
null
In order to deepen our understanding of the nature of the deconfinement phase transition for various gauge groups, we investigate SU(4) Yang-Mills theory in 2+1 dimensions. We find that the transition is weakly first order. We perform extensive Monte Carlo simulations on lattices with temporal extent N_t = 3, 4 and 5, and spatial sizes up to N_s = 20 N_t. We observe coexistence of confined and deconfined phases at the critical temperature, and finite-size scaling shows consistency with first order exponents. The continuum extrapolation of the latent heat yields L_h/T_c^3=0.188(17).
[ { "version": "v1", "created": "Fri, 7 Dec 2007 19:24:03 GMT" }, { "version": "v2", "created": "Fri, 4 Apr 2008 22:01:46 GMT" } ]
2008-11-26T00:00:00
[ [ "Holland", "Kieran", "" ], [ "Pepe", "Michele", "" ], [ "Wiese", "Uwe-Jens", "" ] ]
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712.1217
Aram Mekjian
Aram Z. Mekjian
Generalized statistical models of voids and hierarchical structure in cosmology
25 pages
Astrophys.J.655:1-10,2007
10.1086/508151
null
astro-ph nucl-th
null
Generalized statistical models of voids and hierarchical structure in cosmology are developed. The often quoted negative binomial model and frequently used thermodynamic model are shown to be special cases of a more general distribution which contains a parameter "a". The parameter is related to the Levy index alpha and the Fisher critical exponent tau, the latter describing the power law fall off of clumps of matter around a phase transition. The parameter"a", exponent tau, or index alpha can be obtained from properties of a void scaling function. A stochastic probability variable "p" is introduced into a statistical model which represent the adhesive growth of galaxy structure. For p<1/2, the galaxy count distribution decays exponential fast with size. For p>1/2, an adhesive growth can go on indefinitely thereby forming an infinite supercluster. At p=1/2 a scale free power law distribution for the galaxy count distribution is present. The stochastic description also leads to consequences that have some parallels with cosmic string results, percolation theory and phase transitions.
[ { "version": "v1", "created": "Fri, 7 Dec 2007 19:45:48 GMT" } ]
2008-11-26T00:00:00
[ [ "Mekjian", "Aram Z.", "" ] ]
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712.1218
Siqi Fu
Siqi Fu and Howard Jacobowitz
The $\overline\partial$-cohomology groups, holomorphic Morse inequalities, and finite type conditions
27 pages
null
null
null
math.CV math.DG
null
We study spectral behavior of the complex Laplacian on forms with values in the $k^{\text{th}}$ tensor power of a holomorphic line bundle over a smoothly bounded domain with degenerated boundary in a complex manifold. In particular, we prove that in the two dimensional case, a pseudoconvex domain is of finite type if and only if for any positive constant $C$, the number of eigenvalues of the $\overline\partial$-Neumann Laplacian less than or equal to $Ck$ grows polynomially as $k$ tends to infinity.
[ { "version": "v1", "created": "Fri, 7 Dec 2007 20:02:51 GMT" } ]
2007-12-10T00:00:00
[ [ "Fu", "Siqi", "" ], [ "Jacobowitz", "Howard", "" ] ]
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712.1219
Francois Meyer
Francois G. Meyer and Greg J. Stephens
Locality and low-dimensions in the prediction of natural experience from fMRI
To appear in: Advances in Neural Information Processing Systems 20, Scholkopf B., Platt J. and Hofmann T. (Editors), MIT Press, 2008
null
null
null
q-bio.NC stat.ML
null
Functional Magnetic Resonance Imaging (fMRI) provides dynamical access into the complex functioning of the human brain, detailing the hemodynamic activity of thousands of voxels during hundreds of sequential time points. One approach towards illuminating the connection between fMRI and cognitive function is through decoding; how do the time series of voxel activities combine to provide information about internal and external experience? Here we seek models of fMRI decoding which are balanced between the simplicity of their interpretation and the effectiveness of their prediction. We use signals from a subject immersed in virtual reality to compare global and local methods of prediction applying both linear and nonlinear techniques of dimensionality reduction. We find that the prediction of complex stimuli is remarkably low-dimensional, saturating with less than 100 features. In particular, we build effective models based on the decorrelated components of cognitive activity in the classically-defined Brodmann areas. For some of the stimuli, the top predictive areas were surprisingly transparent, including Wernicke's area for verbal instructions, visual cortex for facial and body features, and visual-temporal regions for velocity. Direct sensory experience resulted in the most robust predictions, with the highest correlation ($c \sim 0.8$) between the predicted and experienced time series of verbal instructions. Techniques based on non-linear dimensionality reduction (Laplacian eigenmaps) performed similarly. The interpretability and relative simplicity of our approach provides a conceptual basis upon which to build more sophisticated techniques for fMRI decoding and offers a window into cognitive function during dynamic, natural experience.
[ { "version": "v1", "created": "Fri, 7 Dec 2007 20:21:18 GMT" }, { "version": "v2", "created": "Sat, 12 Jan 2008 01:00:50 GMT" } ]
2008-01-16T00:00:00
[ [ "Meyer", "Francois G.", "" ], [ "Stephens", "Greg J.", "" ] ]
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712.122
Lukasz Stawarz
L. Stawarz, L. Ostorero, M.C. Begelman, R. Moderski, J. Kataoka, S. Wagner
On the Evolution of and High-Energy Emission from GHz-Peaked-Spectrum Sources
32 pages, 3 figures included. Revised version, accepted for publication in ApJ
null
10.1086/587781
null
astro-ph
null
Here we discuss evolution and broad-band emission of compact (< kpc) lobes in young radio sources. We propose a simple dynamical description for these objects, consisting of a relativistic jet propagating into a uniform gaseous medium in the central parts of an elliptical host. In the framework of the proposed model, we follow the evolution of ultrarelativistic electrons injected from a terminal hotspot of a jet to expanding lobes, taking into account their adiabatic energy losses as well as radiative cooling. This allows us to discuss the broad-band lobe emission of young radio sources. In particular, we argue that the observed spectral turnover in the radio synchrotron spectra of these objects cannot originate from the synchrotron self-absorption process but is most likely due to free-free absorption effects connected with neutral clouds of interstellar medium engulfed by the expanding lobes and photoionized by active centers. We also find a relatively strong and complex high-energy emission component produced by inverse-Compton up-scattering of various surrounding photon fields by the lobes' electrons. We argue that such high energy radiation is strong enough to account for several observed properties of GHz-peaked-spectrum (GPS) radio galaxies at UV and X-ray frequencies. In addition, this emission is expected to extend up to GeV (or possibly even TeV) photon energies and can thus be probed by several modern gamma-ray instruments. In particular, we suggest that GPS radio galaxies should constitute a relatively numerous class of extragalactic sources detected by GLAST.
[ { "version": "v1", "created": "Fri, 7 Dec 2007 20:15:17 GMT" }, { "version": "v2", "created": "Tue, 26 Feb 2008 06:01:25 GMT" } ]
2009-11-13T00:00:00
[ [ "Stawarz", "L.", "" ], [ "Ostorero", "L.", "" ], [ "Begelman", "M. C.", "" ], [ "Moderski", "R.", "" ], [ "Kataoka", "J.", "" ], [ "Wagner", "S.", "" ] ]
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712.1221
Philippe G. LeFloch
Paulo Amorim, Philippe G. LeFloch, and Bawer Okutmustur
Finite volume schemes on Lorentzian manifolds
24 pages
null
null
null
math.NA math.AP
null
We investigate the numerical approximation of (discontinuous) entropy solutions to nonlinear hyperbolic conservation laws posed on a Lorentzian manifold. Our main result establishes the convergence of monotone and first-order finite volume schemes for a large class of (space and time) triangulations. The proof relies on a discrete version of entropy inequalities and an entropy dissipation bound, which take into account the manifold geometry accurately and generalize techniques and estimates that were known in the (flat) Euclidian setting, only. The strong convergence of the scheme then is then a consequence of the well-posed theory recently developed by Ben-Artzi and LeFloch for conservation laws on manifolds.
[ { "version": "v1", "created": "Fri, 7 Dec 2007 20:26:25 GMT" } ]
2007-12-10T00:00:00
[ [ "Amorim", "Paulo", "" ], [ "LeFloch", "Philippe G.", "" ], [ "Okutmustur", "Bawer", "" ] ]
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712.1222
George Simion
George E. Simion, John J. Quinn
Fractional quantum Hall effect and electron correlations in partially filled first excited Landau level
4 pages, 7 figures
null
10.1016/j.physe.2008.04.004
null
cond-mat.mes-hall
null
We present a quantitative study of most prominent incompressible quantum Hall states in the partially filled first excited Landau level (LL1) which have been recently studied experimentally by Choi et al. The pseudopotential describing the electron - electron interaction in LL1 is harmonic at short range. It produces a series of incompressible states which is different from its LL0 counterpart. The numerical data indicate that the most prominent states $\nu={5/2}$, 7/3, and 8/3 are not produced by Laughlin correlated electrons, but result from a tendency of electrons to form pairs or larger clusters which eventually become Laughlin correlated. States with smaller gaps at filling factors 14/5, 16/7, 11/5, 19/7 are Laughlin correlated electron or hole states and fit Jain's sequence of filled $\rm{CF}^4$ levels.
[ { "version": "v1", "created": "Fri, 7 Dec 2007 20:28:12 GMT" }, { "version": "v2", "created": "Mon, 10 Dec 2007 22:52:52 GMT" }, { "version": "v3", "created": "Sun, 6 Apr 2008 03:07:16 GMT" } ]
2009-11-13T00:00:00
[ [ "Simion", "George E.", "" ], [ "Quinn", "John J.", "" ] ]
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712.1223
Gregory Korchemsky
J.M.Drummond, J.Henn, G.P.Korchemsky, E.Sokatchev
Conformal Ward identities for Wilson loops and a test of the duality with gluon amplitudes
28 pages, 5 figures. Published version
Nucl.Phys.B826:337-364,2010
10.1016/j.nuclphysb.2009.10.013
LAPTH-1224/07, LPT-Orsay-07-133
hep-th hep-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Planar gluon amplitudes in N=4 SYM are remarkably similar to expectation values of Wilson loops made of light-like segments. We argue that the latter can be determined by making use of the conformal symmetry of the gauge theory, broken by cusp anomalies. We derive the corresponding anomalous conformal Ward identities valid to all loops and show that they uniquely fix the form of the finite part of a Wilson loop with n cusps (up to an additive constant) for n=4 and n=5 and reduce the freedom in it to a function of conformal invariants for n>=6. We also present an explicit two-loop calculation for n=5. The result confirms the form predicted by the Ward identities and exactly matches the finite part of the two-loop five-gluon planar MHV amplitude. This constitutes another non-trivial test of the Wilson loop/gluon amplitude duality.
[ { "version": "v1", "created": "Fri, 7 Dec 2007 20:50:51 GMT" }, { "version": "v2", "created": "Sat, 8 Dec 2007 22:35:02 GMT" }, { "version": "v3", "created": "Wed, 28 Oct 2009 10:22:19 GMT" } ]
2009-11-18T00:00:00
[ [ "Drummond", "J. M.", "" ], [ "Henn", "J.", "" ], [ "Korchemsky", "G. P.", "" ], [ "Sokatchev", "E.", "" ] ]
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712.1224
Kiran Lakkaraju
Kiran Lakkaraju, Adam Slagell
Evaluating the Utility of Anonymized Network Traces for Intrusion Detection
* Updated version. * 17 pages
null
null
null
cs.CR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Anonymization is the process of removing or hiding sensitive information in logs. Anonymization allows organizations to share network logs while not exposing sensitive information. However, there is an inherent trade off between the amount of information revealed in the log and the usefulness of the log to the client (the utility of a log). There are many anonymization techniques, and there are many ways to anonymize a particular log (that is, which fields to anonymize and how). Different anonymization policies will result in logs with varying levels of utility for analysis. In this paper we explore the effect of different anonymization policies on logs. We provide an empirical analysis of the effect of varying anonymization policies by looking at the number of alerts generated by an Intrusion Detection System. This is the first work to thoroughly evaluate the effect of single field anonymization policies on a data set. Our main contributions are to determine a set of fields that have a large impact on the utility of a log.
[ { "version": "v1", "created": "Fri, 7 Dec 2007 20:53:22 GMT" }, { "version": "v2", "created": "Fri, 27 Jun 2008 21:08:26 GMT" } ]
2008-06-28T00:00:00
[ [ "Lakkaraju", "Kiran", "" ], [ "Slagell", "Adam", "" ] ]
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712.1225
Luca Vecchi
Luca Vecchi
Massive states as the relevant deformations of gravitating branes
Version published in Phys. Rev. D
Phys.Rev.D78:085029,2008
10.1103/PhysRevD.78.085029
null
hep-th
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Five-dimensional theories manifesting spontaneous brane generation are discussed in a gravitational context. Without gravity, the IR dynamics of the brane fluctuation below the brane tension scale is described by an effective theory for the Nambu-Goldstone modes. When gravity is properly taken into account the long distance dynamics changes. The spontaneous breaking of local translational invariance triggers the formation of massive representations via the Higgs mechanism and induces the appearance of new mass scales in the IR. These scales can in principle depend on other fundamental parameters besides the brane tension and the Planck scale. In noncompact extra dimensions the massive states are found to be scalar bound states. We obtain explicit expressions for their propagator and show that their masses depend on the brane width and are thus much heavier than expected. We present an exactly solvable model which captures the main features of the gravitational system.
[ { "version": "v1", "created": "Fri, 7 Dec 2007 20:53:22 GMT" }, { "version": "v2", "created": "Thu, 14 Aug 2008 15:03:51 GMT" }, { "version": "v3", "created": "Tue, 9 Dec 2008 17:47:47 GMT" } ]
2008-12-18T00:00:00
[ [ "Vecchi", "Luca", "" ] ]
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712.1226
Margarita Sharina
M. E. Sharina, I. D. Karachentsev, A. E. Dolphin, V. E. Karachentseva, R. Brent Tully, G. M. Karataeva, D. I. Makarov, L. N. Makarova, S. Sakai, E. J. Shaya, E. Yu. Nikolaev, A. N. Kuznetsov
Photometric properties of Local Volume dwarf galaxies
14 pages, 11 figures, 2 tables, MNRAS accepted
null
10.1111/j.1365-2966.2007.12814.x
null
astro-ph
null
We present surface photometry and metallicity measurements for 104 nearby dwarf galaxies imaged with the Advanced Camera for Surveys and Wide Field and Planetary Camera 2 aboard the Hubble Space Telescope. In addition, we carried out photometry for 26 galaxies of the sample and for Sextans B on images of the Sloan Digital Sky Survey. Our sample comprises dwarf spheroidal, irregular and transition type galaxies located within ~10 Mpc in the field and in nearby groups: M81, Centaurus A, Sculptor, and Canes Venatici I cloud. It is found that the early-type galaxies have on average higher metallicity at a given luminosity in comparison to the late-type objects. Dwarf galaxies with M_B > -12 -- -13 mag deviate toward larger scale lengths from the scale length -- luminosity relation common for spiral galaxies, h \propto L^{0.5}_B. The following correlations between fundamental parameters of the galaxies are consistent with expectations if there is pronounced gas-loss through galactic winds: 1) between the luminosity of early-type dwarf galaxies and the mean metallicity of constituent red giant branch stars, Z ~ L^0.4, 2) between mean surface brightness within the 25 mag/sq.arcsec isophote and the corresponding absolute magnitude in the V and I bands, SB_25 ~ 0.3 M_25, and 3) between the central surface brightness (or effective surface brightness) and integrated absolute magnitude of galaxies in the V and I bands, SB_0 ~ 0.5 M_L, SB_e ~ 0.5 M_e. The knowledge of basic photometric parameters for a large sample of dwarf galaxies is essential for a better understanding of their evolution.
[ { "version": "v1", "created": "Fri, 7 Dec 2007 20:56:48 GMT" }, { "version": "v2", "created": "Fri, 7 Dec 2007 21:18:03 GMT" } ]
2009-11-13T00:00:00
[ [ "Sharina", "M. E.", "" ], [ "Karachentsev", "I. D.", "" ], [ "Dolphin", "A. E.", "" ], [ "Karachentseva", "V. E.", "" ], [ "Tully", "R. Brent", "" ], [ "Karataeva", "G. M.", "" ], [ "Makarov", "D. I.", "" ], [ "Makarova", "L. N.", "" ], [ "Sakai", "S.", "" ], [ "Shaya", "E. J.", "" ], [ "Nikolaev", "E. Yu.", "" ], [ "Kuznetsov", "A. N.", "" ] ]
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712.1227
Nora Brambilla
Nora Brambilla
Effective Field Theories for Heavy Quarkonium
Invited Plenary talk at The 20th European Conference on Few-Body Problems in Physics. September 10-14 2007. Pisa, Italy. To be published on Few-Body Systems
Few Body Syst.43:25-30,2008
10.1007/s00601-008-0204-z
null
hep-ph hep-th nucl-th
null
We briefly review how nonrelativistic effective field theories give us a definition of the QCD potentials and a coherent field theory derived quantum mechanical scheme to calculate the properties of bound states made by two or more heavy quarks. In this framework heavy quarkonium properties depend only on the QCD parameters (quark masses and $\als$) and nonpotential corrections are systematically accounted for. The relation between the form of the nonperturbative potentials and the low energy QCD dynamics is also discussed.
[ { "version": "v1", "created": "Sun, 9 Dec 2007 15:36:56 GMT" } ]
2009-01-08T00:00:00
[ [ "Brambilla", "Nora", "" ] ]
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712.1228
Nathaniel Thiem
Eric Marberg and Nathaniel Thiem
Superinduction for pattern groups
null
J. Algebra 321 (2009), 3681-3703
10.1016/j.jalgebra.2009.03.003
null
math.RT math.CO math.GR
null
It is well-known that the representation theory of the finite group of unipotent upper-triangular matrices $U_n$ over a finite field is a wild problem. By instead considering approximately irreducible representations (supercharacters), one obtains a rich combinatorial theory analogous to that of the symmetric group, where we replace partition combinatorics with set-partitions. This paper studies Diaconis--Isaacs' concept of superinduction in pattern groups. While superinduction shares many desirable properties with usual induction, it no longer takes characters to characters. We begin by finding sufficient conditions guaranteeing that super-induction is in fact induction. It turns out for natural embedding of $U_m$ in $U_n$, super-induction is induction. We conclude with an explicit combinatorial algorithm for computing this induction analogous to the Pieri-formulas for the symmetric group.
[ { "version": "v1", "created": "Fri, 7 Dec 2007 21:57:29 GMT" } ]
2011-03-29T00:00:00
[ [ "Marberg", "Eric", "" ], [ "Thiem", "Nathaniel", "" ] ]
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712.1229
Kuenley Chiu
Kuenley Chiu (1), Michael C. Liu (2), Linhua Jiang (3), Katelyn N. Allers (2), Daniel P. Stark (4), Andrew Bunker (1,5), Xiaohui Fan (3), Karl Glazebrook (6), Trent J. Dupuy (2) ((1) University of Exeter, (2) IfA, University of Hawaii, (3) University of Arizona, (4) Caltech, (5) Anglo-Australian Observatory, (6) Swinburne University of Technology)
Four Faint T Dwarfs from the UKIRT Infrared Deep Sky Survey (UKIDSS) Southern Stripe
Accepted for publication in MNRAS Letters
null
10.1111/j.1745-3933.2008.00432.x
null
astro-ph
null
We present the optical and near-infrared photometry and spectroscopy of four faint T dwarfs newly discovered from the UKIDSS first data release. The sample, drawn from an imaged area of ~136 square degrees to a depth of Y=19.9 (5-sigma, Vega), is located in the SDSS Southern Equatorial Stripe, a region of significant future deep imaging potential. We detail the selection and followup of these objects, three of which are spectroscopically confirmed brown dwarfs ranging from type T2.5 to T7.5, and one is photometrically identified as early T. Their magnitudes range from Y=19.01 to 19.88 with derived distances from 34 to 98 pc, making these among the coldest and faintest brown dwarfs known. The sample brings the total number of T dwarfs found or confirmed by UKIDSS data in this region to nine, and we discuss the projected numbers of dwarfs in the future survey data. We estimate that ~240 early- and late-T dwarfs are discoverable in the UKIDSS LAS data, falling significantly short of published model projections and suggesting that IMFs and/or birthrates may be at the low end of possible models. Thus, deeper optical data has good potential to exploit the UKIDSS survey depth more fully, but may still find the potential Y dwarf sample to be extremely rare.
[ { "version": "v1", "created": "Sat, 8 Dec 2007 10:23:26 GMT" } ]
2009-11-13T00:00:00
[ [ "Chiu", "Kuenley", "" ], [ "Liu", "Michael C.", "" ], [ "Jiang", "Linhua", "" ], [ "Allers", "Katelyn N.", "" ], [ "Stark", "Daniel P.", "" ], [ "Bunker", "Andrew", "" ], [ "Fan", "Xiaohui", "" ], [ "Glazebrook", "Karl", "" ], [ "Dupuy", "Trent J.", "" ] ]
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712.123
Richard Hill
Jeffrey A. Harvey, Christopher T. Hill, Richard J. Hill
Standard Model Gauging of the WZW Term: Anomalies, Global Currents and pseudo-Chern-Simons Interactions
14 pages
Phys.Rev.D77:085017,2008
10.1103/PhysRevD.77.085017
EFI preprint 07-27, FERMILAB-PUB-07-628-T
hep-th astro-ph hep-ph nucl-th
null
The standard model $SU(2)_L\times U(1)_Y$ gauging of the Wess-Zumino-Witten term requires a modified counterterm when background fields, needed to generate the full set of currents, are introduced. The modified counterterm plays an essential role in properly defining covariant global currents and their anomalies. For example, it is required in order to correctly derive the gauge invariant baryon number current and its anomalous divergence. The background fields can also be promoted to a description of the physical spin-1 vector and axial-vector mesons in QCD and the counterterm leads to novel interactions. These are (pseudo-) Chern-Simons terms, such as $\epsilon^{\mu\nu\rho\sigma} \omega_\mu Z_\nu \partial_\rho A_\sigma$ and $\epsilon^{\mu\nu\rho\sigma} \rho^{\pm}_\mu W^{\mp}_\nu \partial_\rho A_\sigma$ that mediate new interactions between neutrinos and photons at finite baryon density.
[ { "version": "v1", "created": "Mon, 10 Dec 2007 14:12:41 GMT" } ]
2008-11-26T00:00:00
[ [ "Harvey", "Jeffrey A.", "" ], [ "Hill", "Christopher T.", "" ], [ "Hill", "Richard J.", "" ] ]
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712.1231
M. T. Yamashita
M.T. Yamashita, T. Frederico and L. Tomio
Trajectory of virtual, bound and resonant Efimov states
Proceedings of the 20th European Conference on Few-Body Problems in Physics. To be published in Few-Body Systems
Few Body Syst.44:191-193,2008
10.1007/s00601-008-0288-5
null
nucl-th
null
The pole trajectory of Efimov states for a three-body $\alpha\alpha\beta$ system with $\alpha\alpha$ unbound and $\alpha\beta$ bound is calculated using a zero-range Dirac-$\delta$ potential. It is showed that a three-body bound state turns into a virtual one by increasing the $\alpha\beta$ binding energy. This result is consistent with previous results for three equal mass particles. The present approach considers the $n-n-^{18}C$ halo nucleus. However, the results have good perspective to be tested and applied in ultracold atomic systems, where one can realize such three-body configuration with tunable two-body interaction.
[ { "version": "v1", "created": "Fri, 7 Dec 2007 21:05:41 GMT" } ]
2009-01-16T00:00:00
[ [ "Yamashita", "M. T.", "" ], [ "Frederico", "T.", "" ], [ "Tomio", "L.", "" ] ]
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712.1232
Perivolaropoulos Leandros
R. Lazkoz, S. Nesseris, and L. Perivolaropoulos
Comparison of Standard Ruler and Standard Candle constraints on Dark Energy Models
References added. 9 pages, 7 figures. The Mathematica files with the numerical analysis of the paper can be found at http://leandros.physics.uoi.gr/rulcand/rulcand.htm
JCAP 0807:012,2008
10.1088/1475-7516/2008/07/012
null
astro-ph gr-qc hep-ph hep-th
null
We compare the dark energy model constraints obtained by using recent standard ruler data (Baryon Acoustic Oscillations (BAO) at z=0.2 and z=0.35 and Cosmic Microwave Background (CMB) shift parameters R and l_a) with the corresponding constraints obtained by using recent Type Ia Supernovae (SnIa) standard candle data (ESSENCE+SNLS+HST from Davis et. al.). We find that, even though both classes of data are consistent with LCDM at the 2\sigma level, there is a systematic difference between the two classes of data. In particular, we find that for practically all values of the parameters (\Omega_0m,\Omega_b) in the 2\sigma range of the the 3-year WMAP data (WMAP3) best fit, LCDM is significantly more consistent with the SnIa data than with the CMB+BAO data. For example for (\Omega_0m,\Omega_b)=(0.24,0.042) corresponding to the best fit values of WMAP3, the dark energy equation of state parametrization w(z)=w_0 + w_1 (z/(1+z)) best fit is at a 0.5\sigma distance from LCDM (w_0=-1,w_1=0) using the SnIa data and 1.7\sigma away from LCDM using the CMB+BAO data. There is a similar trend in the earlier data (SNLS vs CMB+BAO at z=0.35). This trend is such that the standard ruler CMB+BAO data show a mild preference for crossing of the phantom divide line w=-1, while the recent SnIa data favor LCDM. Despite of this mild difference in trends, we find no statistically significant evidence for violation of the cosmic distance duality relation \eta \equiv d_L(z)/(d_A(z) (1+z)^2)=1. For example, using a prior of \Omega_0m=0.24, we find \eta=0.95 \pm 0.025 in the redshift range 0<z<2, which is consistent with distance duality at the 2\sigma level.
[ { "version": "v1", "created": "Sat, 8 Dec 2007 07:52:25 GMT" }, { "version": "v2", "created": "Fri, 14 Dec 2007 09:31:06 GMT" } ]
2009-05-29T00:00:00
[ [ "Lazkoz", "R.", "" ], [ "Nesseris", "S.", "" ], [ "Perivolaropoulos", "L.", "" ] ]
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712.1233
Brian Metzger
B.D. Metzger, E. Quataert, Todd A. Thompson
Short Duration Gamma-Ray Bursts with Extended Emission from Proto-Magnetar Spin-Down
6 pages, 2 figures; accepted to MNRAS
null
10.1111/j.1365-2966.2008.12923.x
null
astro-ph
null
Evidence is growing for a class of gamma-ray bursts (GRBs) characterized by an initial ~0.1-1 s spike of hard radiation followed, after a ~3-10 s lull in emission, by a softer period of extended emission lasting ~10-100 s. In a few well-studied cases, these ``short GRBs with extended emission'' show no evidence for a bright associated supernova (SN). We propose that these events are produced by the formation and early evolution of a highly magnetized, rapidly rotating neutron star (a ``proto-magnetar'') which is formed from the accretion-induced collapse (AIC) of a white dwarf (WD), the merger and collapse of a WD-WD binary, or, perhaps, the merger of a double neutron star binary. The initial emission spike is powered by accretion onto the proto-magnetar from a small disk that is formed during the AIC or merger event. The extended emission is produced by a relativistic wind that extracts the rotational energy of the proto-magnetar on a timescale ~10-100 s. The ~3-10 s delay between the prompt and extended emission is the time required for the newly-formed proto-magnetar to cool sufficiently that the neutrino-heated wind from its surface becomes ultra-relativistic. Because a proto-magnetar ejects little or no Ni56 (< 1e-3 M_sun), these events should not produce a bright SN-like transient. We model the extended emission from GRB060614 using spin-down calculations of a cooling proto-magnetar, finding reasonable agreement with observations for a magnetar with an initial rotation period of ~1 ms and a surface dipole field of ~3e15 G. If GRBs are indeed produced by AIC or WD-WD mergers, they should occur within a mixture of both early and late-type galaxies and should not produce strong gravitational wave emission. An additional consequence of our model is the existence of X-ray flashes unaccompanied by a bright SN.
[ { "version": "v1", "created": "Fri, 7 Dec 2007 21:13:33 GMT" }, { "version": "v2", "created": "Tue, 8 Jan 2008 00:29:16 GMT" } ]
2009-11-13T00:00:00
[ [ "Metzger", "B. D.", "" ], [ "Quataert", "E.", "" ], [ "Thompson", "Todd A.", "" ] ]
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712.1234
Shufang Su
Ethan M. Dolle, Shufang Su
Dark Matter in the Left Right Twin Higgs Model
18 pages
Phys.Rev.D77:075013,2008
10.1103/PhysRevD.77.075013
null
hep-ph
null
In the left-right twin Higgs model, one of the neutral Higgses is a natural candidate for WIMP dark matter. We analyzed the dark matter relic density in this framework and identified regions of parameter space that provide the right amount of dark matter. We also studied the dark matter in the more general inert Higgs doublet model in which the mass splittings between the dark matter and other particles do not follow the relations in the left-right twin Higgs model.
[ { "version": "v1", "created": "Mon, 10 Dec 2007 18:24:39 GMT" } ]
2008-11-26T00:00:00
[ [ "Dolle", "Ethan M.", "" ], [ "Su", "Shufang", "" ] ]
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712.1235
Mark Linton
M. G. Linton, C. R. DeVore, and D. W. Longcope
Patchy Reconnection in a Y-Type Current Sheet
4 pages, 3 figures
Earth Planets, and Space (2009), 61 p573
10.1186/BF03352925
null
astro-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study the evolution of the magnetic field in a Y-type current sheet subject to a brief, localized magnetic reconnection event. The reconnection produces up- and down-flowing reconnected flux tubes which rapidly decelerate when they hit the Y-lines and underlying magnetic arcade loops at the ends of the current sheet. This localized reconnection outflow followed by a rapid deceleration reproduces the observed behavior of post-CME downflowing coronal voids. These simulations support the hypothesis that these observed coronal downflows are the retraction of magnetic fields reconnected in localized patches in the high corona.
[ { "version": "v1", "created": "Fri, 7 Dec 2007 21:18:43 GMT" }, { "version": "v2", "created": "Mon, 1 Mar 2010 19:21:57 GMT" } ]
2015-05-13T00:00:00
[ [ "Linton", "M. G.", "" ], [ "DeVore", "C. R.", "" ], [ "Longcope", "D. W.", "" ] ]
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712.1236
David P. Blecher
David P. Blecher and Upasana Kashyap
A characterization and a generalization of W*-modules
19 pages
null
null
null
math.OA math.FA
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We give a new Banach module characterization of $W^*$-modules, also known as selfdual Hilbert $C^*$-modules over a von Neumann algebra. This leads to a generalization of the notion, and the theory, of W*-modules, to the setting where the operator algebras are $\sigma$-weakly closed algebras of operators on a Hilbert space. That is, we find the appropriate weak* topology variant of our earlier notion of {\em rigged modules}, and their theory, which in turn generalizes the notions of C*-module, and Hilbert space, successively. Our {\em w*-rigged modules} have canonical `envelopes' which are W*-modules. Indeed, w*-rigged modules may be defined to be a subspace of a W*-module possessing certain properties.
[ { "version": "v1", "created": "Sun, 9 Dec 2007 01:37:23 GMT" }, { "version": "v2", "created": "Thu, 27 Aug 2009 22:28:40 GMT" } ]
2009-08-28T00:00:00
[ [ "Blecher", "David P.", "" ], [ "Kashyap", "Upasana", "" ] ]
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712.1237
Nathaniel Thiem
Nathaniel Thiem and Vidya Venkateswaran
Restricting supercharacters of the finite group of unipotent uppertriangular matrices
null
null
null
null
math.RT math.CO math.GR
null
It is well-known that the representation theory of the finite group of unipotent upper-triangular matrices $U_n$ over a finite field is a wild problem. By instead considering approximately irreducible representations (supercharacters), one obtains a rich combinatorial theory analogous to that of the symmetric group, where we replace partition combinatorics with set-partitions. This paper studies the supercharacter theory of a family of subgroups that interpolate between $U_{n-1}$ and $U_n$. We supply several combinatorial indexing sets for the supercharacters, supercharacter formulas for these indexing sets, and a combinatorial rule for restricting supercharacters from one group to another. A consequence of this analysis is a Pieri-like restriction rule from $U_n$ to $U_{n-1}$ that can be described on set-partitions (analogous to the corresponding symmetric group rule on partitions).
[ { "version": "v1", "created": "Fri, 7 Dec 2007 21:51:34 GMT" } ]
2007-12-11T00:00:00
[ [ "Thiem", "Nathaniel", "" ], [ "Venkateswaran", "Vidya", "" ] ]
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712.1238
Andon Rangelov A
A. A. Rangelov, N. V. Vitanov, B. W. Shore,
Population trapping in three-state quantum loops revealed by Householder reflections
null
null
10.1103/PhysRevA.77.033404
null
quant-ph
null
Population trapping occurs when a particular quantum-state superposition is immune to action by a specific interaction, such as the well-known dark state in a three-state lambda system. We here show that in a three-state loop linkage, a Hilbert-space Householder reflection breaks the loop and presents the linkage as a single chain. With certain conditions on the interaction parameters, this chain can break into a simple two-state system and an additional spectator state. Alternatively, a two-photon resonance condition in this Householder-basis chain can be enforced, which heralds the existence of another spectator state. These spectator states generalize the usual dark state to include contributions from all three bare basis states and disclose hidden population trapping effects, and hence hidden constants of motion. Insofar as a spectator state simplifies the overall dynamics, its existence facilitates the derivation of analytic solutions and the design of recipes for quantum state engineering in the loop system. Moreover, it is shown that a suitable sequence of Householder transformations can cast an arbitrary N-dimensional hermitian Hamiltonian into a tridiagonal form. The implication is that a general N-state system, with arbitrary linkage patterns where each state connects to any other state, can be reduced to an equivalent chainwise-connected system, with nearest-neighbor interactions only, with ensuing possibilities for discovering hidden multidimensional spectator states and constants of motion.
[ { "version": "v1", "created": "Fri, 7 Dec 2007 22:30:08 GMT" } ]
2008-05-28T00:00:00
[ [ "Rangelov", "A. A.", "" ], [ "Vitanov", "N. V.", "" ], [ "Shore", "B. W.", "" ] ]
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712.1239
Anthony N. Aguirre
Anthony Aguirre, Corey Dow-Hygelund, Joop Schaye, Tom Theuns
Metallicity of the intergalactic medium using pixel statistics: IV. Oxygen
13 ApJ-style pages, 11 color figures, minor revisions to match version accepted by ApJ
null
10.1086/592554
null
astro-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We have studied the abundance of oxygen in the IGM by analyzing OVI, CIV, SiIV, and HI pixel optical depths derived from a set of high-quality VLT and Keck spectra of 17 QSOs at 2.1 < z < 3.6. Comparing OVI and CIV optical depth ratios to those in realistic, synthetic spectra drawn from a hydrodynamical simulation and comparing to existing constraints on [Si/C] places strong constraints on the ultraviolet background (UVB) model using weak priors on allowed values of [Si/O]: for example, a quasar-only background yields [Si/O] ~ 1.4, highly inconsistent with the [Si/O] ~ 0 expected from nucleosynthetic yields and with observations of metal-poor stars. Assuming a fiducial quasar+galaxy UVB consistent with these constraints yields a primary result that [O/C] = 0.66 +/- 0.06 +/- 0.2; this result pertains to gas with overdensity >~ 0.2. Consistent results are obtained by similarly comparing OVI to HI or OVI to SiIV optical depth ratios to simulation values, and also by directly ionization-correcting OVI optical depths as function of HI optical depths into [O/H] as a function of density. Subdividing the sample reveals no evidence for evolution, but low- and high-density samples are inconsistent, suggesting either density-dependence of [O/C] or -- more likely -- prevalence of collisionally-ionized gas at high density.
[ { "version": "v1", "created": "Fri, 7 Dec 2007 22:39:23 GMT" }, { "version": "v2", "created": "Mon, 21 Jul 2008 23:24:14 GMT" } ]
2009-11-13T00:00:00
[ [ "Aguirre", "Anthony", "" ], [ "Dow-Hygelund", "Corey", "" ], [ "Schaye", "Joop", "" ], [ "Theuns", "Tom", "" ] ]
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712.124
Xiaobing Feng Dr.
Xiaobing Feng and Michael Neilan
Galerkin Methods for the Fully Nonlinear Monge-Amp\`ere Equation
24 pages and 6 figures
null
null
null
math.NA math.AP
null
This paper develops and analyzes finite element Galerkin and spectral Galerkin methods for approximating viscosity solutions of the fully nonlinear Monge-Amp\`ere equation $\det(D^2u^0)=f$ based on the vanishing moment method which was developed by the authors in \cite{Feng2,Feng1}. In this approach, the Monge-Amp\`ere equation is approximated by the fourth order quasilinear equation $-\epsilon\Delta^2 u^\epsilon + \det{D^2u^\epsilon} =f$ accompanied by appropriate boundary conditions. This new approach allows one to construct convergent Galerkin numerical methods for the fully nonlinear Monge-Amp\`ere equation, a task which has been impracticable before. In this paper, we first develop some finite element and spectral Galerkin methods for approximating the solution $u^\epsilon$ of the regularized fourth order problem. We then derive optimal order error estimates for the proposed numerical methods. In particular, we track explicitly the dependence of the error bounds on the parameter $\vepsi$, for the error $u^\epsilon-u^\epsilon_h$. Finally, using the Aygris finite element method as an example, we present a detailed numerical study of the rates of convergence in terms of powers of $\vepsi$ for the error $u^0-u_h^\vepsi$, and numerically examine what is the "best" mesh size $h$ in relation to $\vepsi$ in order to achieve these rates.
[ { "version": "v1", "created": "Fri, 7 Dec 2007 22:40:47 GMT" } ]
2007-12-11T00:00:00
[ [ "Feng", "Xiaobing", "" ], [ "Neilan", "Michael", "" ] ]
[ 0.0193931684, 0.0098494869, -0.0232029967, 0.050916627, -0.0281595942, -0.0528024249, -0.0989790633, -0.051732108, -0.0021820501, 0.0726288185, 0.0621804632, -0.0879700631, -0.1525969803, -0.0457943827, -0.0589185357, 0.1114151552, 0.0402134322, -0.0390156917, 0.0536179096, 0.0039340612, -0.0029274512, -0.0208712295, 0.0436282605, 0.016335113, -0.0532101654, -0.0350402184, 0.0746165588, 0.0824655667, -0.0021119695, -0.0815481469, 0.0624862686, -0.0230118688, -0.0285418518, -0.0696726963, -0.1045854986, 0.1278267205, -0.0142199583, 0.0473488942, -0.1207931936, 0.0055586533, 0.0288221743, -0.0388882719, -0.0722720474, 0.057134673, 0.0066958675, -0.0246555731, 0.010836984, 0.0143601196, 0.0771139711, -0.0580011196, -0.028745722, -0.0479095355, 0.0543314554, -0.0780823529, -0.0381237604, 0.0034721673, 0.00261846, -0.017940592, 0.1033113077, -0.0826184675, -0.0311666839, -0.1178370714, -0.0414621383, -0.0142964097, -0.1277247816, 0.0133280251, -0.1006609946, 0.0060332888, -0.0482153445, 0.1260938197, -0.047476314, -0.0411308482, 0.0687043145, -0.0281595942, -0.0093716662, -0.014538506, -0.008479733, 0.0346834473, -0.0783881545, 0.0150226979, 0.0321605504, -0.0293573327, -0.0650856197, 0.0163223725, -0.0251015387, -0.0682965741, -0.040136978, 0.0703352764, -0.1693143398, 0.004322689, -0.0247320253, 0.0550959669, 0.000812296, 0.0000613204, 0.0525985546, 0.0240057372, 0.0824655667, -0.0051540979, 0.1098861322, 0.0350657031, -0.0753810704, 0.038964726, 0.0597849861, -0.0836378187, 0.1878665537, 0.000654615, -0.0157107599, 0.0704372153, 0.0015123041, 0.0760436505, 0.0845552385, -0.0329760313, 0.0095819077, -0.0563701577, -0.0154814059, -0.0616198182, -0.1323118657, -0.0374356955, -0.1286422014, 0.0518340431, -0.1342486441, 0.0277263708, 0.0496424362, -0.0194441359, 0.1252783388, 0.0077152192, -0.0608043373, 0.00523692, -0.0070462697, 0.0024623717, 0.0678888336, 0.0003790715, -0.0003734969, -0.0894481242, -0.0208584871, -0.0121685127, -0.0366456993, 0.0664107725, 0.1197738424, 0.0140160881, 0.0286692716, 0.0965326205, 0.0685514137, -0.0098176328, 0.033587642, 0.0241204128, 0.0483682454, -0.0169467255, 0.1209970638, -0.029433785, -0.0678378642, -0.0072055436, 0.0209731646, 0.0245154127, 0.0142964097, 0.0126144793, 0.036110539, 0.0126654468, 0.028057659, 0.0427363254, -0.0265795998, 0.0878171623, -0.0482408255, -0.1030564755, -0.017354466, 0.05290436, -0.142097652, -0.1101919338, -0.0507127531, -0.1317002624, -0.0379708558, -0.0209731646, -0.0533121005, -0.0623843335, 0.1330254227, -0.0804778263, 0.0528024249, -0.0858294293, -0.0686533451, 0.0237763822, 0.0367221497, 0.0265795998, 0.0900597349, 0.1155944988, -0.0859823301, 0.1526989043, 0.0143473772, 0.0185649451, 0.0377669856, 0.0094035212, -0.000237716, -0.0120856902, 0.0627411082, 0.0662578717, -0.0663088411, -0.0716094673, 0.0524966195, -0.0306315236, 0.0150864078, 0.0244134776, 0.0199665539, -0.0195715558, 0.1084590405, -0.0430931002, 0.0146786664, 0.0139523782, -0.015748987, -0.0134299612, 0.0354989283, -0.0043386165, -0.0136593152, 0.1115170941, 0.0701823756, -0.0011985349, -0.0162459202, 0.0107286787, -0.147500217, 0.0242860578, 0.0063104252, 0.1044835672, -0.0187178478, 0.0187943, -0.0139014106, 0.055197902, 0.0497443713, -0.0704372153, 0.0724759176, -0.0385060161, -0.1003042236, -0.00603966, 0.0427618101, -0.0159528572, -0.0695707649, 0.0820068568, 0.0187178478, -0.10693001, 0.0282615311, 0.0511204973, -0.1208951324, -0.0442653559, -0.0241204128, 0.0639133602, -0.0025228958, -0.0552998371, -0.092659086, 0.0156343095, -0.0509675927, -0.0674301237, 0.091537796, 0.0447750315, -0.0330524854, 0.0775217116, 0.0258405693, 0.0421756841, -0.0539746806, 0.0360340886 ]
712.1241
Xiaobing Feng Dr.
Xiaobing Feng and Michael Neilan
Mixed finite element methods for the fully nonlinear Monge-Amp\`ere equation based on the vanishing moment method
31 pages and 8 figures
null
null
null
math.NA math.AP
null
This paper studies mixed finite element approximations of the viscosity solution to the Dirichlet problem for the fully nonlinear Monge-Amp\`ere equation $\det(D^2u^0)=f$ based on the vanishing moment method which was proposed recently by the authors in \cite{Feng2}. In this approach, the second order fully nonlinear Monge-Amp\`ere equation is approximated by the fourth order quasilinear equation $-\epsilon\Delta^2 u^\epsilon + \det{D^2u^\epsilon} =f$. It was proved in \cite{Feng1} that the solution $u^\epsilon$ converges to the unique convex viscosity solution $u^0$ of the Dirichlet problem for the Monge-Amp\`ere equation. This result then opens a door for constructing convergent finite element methods for the fully nonlinear second order equations, a task which has been impracticable before. The goal of this paper is threefold. First, we develop a family of Hermann-Miyoshi type mixed finite element methods for approximating the solution $u^\epsilon$ of the regularized fourth order problem, which computes simultaneously $u^\vepsi$ and the moment tensor $\sigma^\vepsi:=D^2u^\epsilon$. Second, we derive error estimates, which track explicitly the dependence of the error constants on the parameter $\vepsi$, for the errors $u^\epsilon-u^\epsilon_h$ and $\sigma^\vepsi-\sigma_h^\vepsi$. Finally, we present a detailed numerical study on the rates of convergence in terms of powers of $\vepsi$ for the error $u^0-u_h^\vepsi$ and $\sigma^\vepsi-\sigma_h^\vepsi$, and numerically examine what is the "best" mesh size $h$ in relation to $\vepsi$ in order to achieve these rates.
[ { "version": "v1", "created": "Fri, 7 Dec 2007 22:52:34 GMT" } ]
2007-12-11T00:00:00
[ [ "Feng", "Xiaobing", "" ], [ "Neilan", "Michael", "" ] ]
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712.1242
Robert Gordon
R.A. Gordon, G.T. Seidler, T.T. Fister, M.W. Haverkort, G.A. Sawatzky, A. Tanaka and T.K. Sham
High multipole transitions in NIXS: valence and hybridization in 4f systems
null
Europhysics Letters 81 (2008) 26004
10.1209/0295-5075/81/26004
null
cond-mat.str-el cond-mat.mtrl-sci
null
Momentum-transfer (q) dependent non-resonant inelastic x-ray scattering measurements were made at the N4,5 edges for several rare earth compounds. With increasing q, giant dipole resonances diminish, to be replaced by strong multiplet lines at lower energy transfer. These multiplets result from two different orders of multipole scattering and are distinct for systems with simple 4f^0 and 4f^1 initial states. A many-body theoretical treatment of the multiplets agrees well with the experimental data on ionic La and Ce phosphate reference compounds. Comparing measurements on CeO2 and CeRh3 to the theory and the phosphates indicates sensitivity to hybridization as observed by a broadening of 4f^0-related multiplet features. We expect such strong, nondipole features to be generic for NIXS from f-electron systems.
[ { "version": "v1", "created": "Fri, 7 Dec 2007 22:58:43 GMT" } ]
2007-12-11T00:00:00
[ [ "Gordon", "R. A.", "" ], [ "Seidler", "G. T.", "" ], [ "Fister", "T. T.", "" ], [ "Haverkort", "M. W.", "" ], [ "Sawatzky", "G. A.", "" ], [ "Tanaka", "A.", "" ], [ "Sham", "T. K.", "" ] ]
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712.1243
D. J. Pisano
D.J. Pisano (1), C.A. Garland (2), R. Guzman (3), J. Perez Gallego (3), F.J. Castander (4), N. Gruel (3) (1. NRAO, 2. Castleton State College, 3. U. Florida, 4. Institut de Ciencies de l'Espai)
What are the Luminous Compact Blue Galaxies?
2 pages, to appear in the proceedings of "The Formation and Evolution of Galaxy Disks", Rome 2007, organized by the Vatican Observatory, editors J. G. Funes, S.J. and E. M. Corsini
null
null
null
astro-ph
null
Luminous Compact Blue Galaxies (LCBGs) are common at z~1, contributing significantly to the total star formation rate density. By z~0, they are a factor of ten rarer. While we know that LCBGs evolve rapidly, we do not know what drives their evolution nor into what types of galaxies they evolve. We present the results of a single-dish HI survey of local LCBGs undertaken to address these questions. Our results indicate that LCBGs have M(HI) and M(DYN) consistent with low-mass spirals, but typically exhaust their gas reservoirs in less than 2 Gyr. Overall, the properties of LCBGs are consistent with them evolving into high-mass dwarf elliptical or dwarf irregular galaxies or low-mass, late-type spiral galaxies.
[ { "version": "v1", "created": "Fri, 7 Dec 2007 23:00:04 GMT" } ]
2007-12-11T00:00:00
[ [ "Pisano", "D. J.", "" ], [ "Garland", "C. A.", "" ], [ "Guzman", "R.", "" ], [ "Gallego", "J. Perez", "" ], [ "Castander", "F. J.", "" ], [ "Gruel", "N.", "" ] ]
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712.1244
William Heinzer
Catalin Ciuperca, William Heinzer, Jack Ratliff, David Rush
Projectively full ideals in Noetherian rings, a survey
16 pages
null
null
null
math.AC
null
We discuss projective equivalence of ideals in Noetherian rings and the existence or failure of existence of projectively full ideals. We describe connections with the Rees valuations and Rees integers of an ideal, and consider the question of whether improvements can be made by passing to an integral extension ring.
[ { "version": "v1", "created": "Fri, 7 Dec 2007 23:04:22 GMT" } ]
2007-12-11T00:00:00
[ [ "Ciuperca", "Catalin", "" ], [ "Heinzer", "William", "" ], [ "Ratliff", "Jack", "" ], [ "Rush", "David", "" ] ]
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712.1245
Farhad Yusef-Zadeh
F. Yusef-Zadeh and M. Wardle
Massive Star Formation Near Sgr A* and Bimodal Star Formation in the Nuclear Disk
8 pages, one figure; in Massive Star Formation: Observations confront Theory", ASP Conference Series, ed: H. Beuther et al
null
null
null
astro-ph
null
The history of star formation in the strong gravitational potential of the Galactic center has been of much interest, recently. We propose that the sub-parsec-scale disk of massive stars orbiting the massive black hole at the Galactic center can be interpreted in terms of partial accretion of extended Galactic center clouds, such as the 50 \kms molecular cloud, as these clouds envelop Sgr A* on their passage through the inner Galactic center. The loss of angular momentum of the captured cloud material by self-interaction subsequent to gravitationally focusing by Sgr A* naturally creates a compact gaseous disk of material close to Sgr A* in which star formation takes place. On a larger scale the formation of massive clusters such as the Arches and Quintuplet clusters or on-going massive star formation such as Sgr B2 could also be triggered by cloud-cloud collisions due to gravitational focusing in the deep potential of the central bulge. Unlike the violent and high-pressure environment of clustered star formation triggered by cloud-cloud collision, there are also isolated pockets of star formation and quiescent dense clouds. These sites suggest an inefficient, slow mode of star formation. We propose enhanced cosmic rays in the nuclear disk may be responsible for inhibiting the process of star formation in this region. In particular, we argue that the enhanced ionization rate due to the impact of cosmic-ray particles is responsible for lowering the efficiency of on-going star formation in the nuclear disk of our Galaxy. The higher ionization fraction and higher thermal energy due to the impact of these electrons may also reduce MHD wave damping which contributes to the persistence of the high velocity dispersion of the molecular gas in the nuclear disk.
[ { "version": "v1", "created": "Fri, 7 Dec 2007 23:07:52 GMT" } ]
2007-12-11T00:00:00
[ [ "Yusef-Zadeh", "F.", "" ], [ "Wardle", "M.", "" ] ]
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712.1246
Grzegorz Bobi\'nski
Grzegorz Bobinski
Orbit closures of directing modules are regular in codimension one
null
null
10.1112/jlms/jdn067
null
math.RT math.AG
null
We show that the orbit closure of a directing module is regular in codimension one. In particular, this result gives information about a distinguished irreducible component of a module variety.
[ { "version": "v1", "created": "Fri, 7 Dec 2007 23:15:03 GMT" } ]
2014-02-26T00:00:00
[ [ "Bobinski", "Grzegorz", "" ] ]
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712.1247
Achim Seifter
Achim Seifter and Damian C. Swift
Pyrometric Measurement of the Temperature of Shocked Molybdenum
null
Physical Review B, vol 77, 134104 (2008)
10.1103/PhysRevB.77.134104
null
cond-mat.mtrl-sci
null
Measurements of the temperature of Mo shocked to ~60 GPa and then released to ~28 GPa were previously attempted using high explosive driven flyer plates and pyrometry. Analysis of the radiance traces at different wavelengths indicates that the temporal evolution of the radiance can be explained by a contribution from the LiF window to the measured thermal radiation. Fitting the radiance traces with a simple model, supported by continuum dynamics studies which were able to relate structures in the radiance history to hydrodynamic events in the experiment, the contribution of the window was obtained and hence the temperature of the Mo sample. The shock-and release temperature obtained in the Mo was 762+/-40K which is consistent with calculations taking the contribution of plastic work to the heating into account. The radiance obtained for the LiF window shows a non thermal distribution which can be described by a bulk temperature of 624+/-112K and hot spots (less than 0.5% in total volume) within the window at a temperature of about 2000K.
[ { "version": "v1", "created": "Fri, 7 Dec 2007 23:33:05 GMT" } ]
2009-11-13T00:00:00
[ [ "Seifter", "Achim", "" ], [ "Swift", "Damian C.", "" ] ]
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712.1248
Jean Berney
J. Berney, L. Schifferle, M. T. Portella-Oberli, and B. Deveaud
Determination of Trion and Exciton Lineshapes in Modulation-Doped Quantum Wells
null
null
null
null
cond-mat.str-el
null
We investigate the effect of a two dimensional electron gas on the linear optical properties of CdTe quantum wells. We evidence experimentally the high energy tail of the exciton and charged exciton resonances which depends on electron concentration. Based on that, we show that the scattering of electrons with excitons and charged excitons is needed to be included in the matrix transfer calculations to describe the reflectivity spectra. We demonstrate by time-resolved reflectivity experiments the importance of electron distribution in the resonance lineshapes.
[ { "version": "v1", "created": "Sat, 8 Dec 2007 01:58:56 GMT" } ]
2007-12-11T00:00:00
[ [ "Berney", "J.", "" ], [ "Schifferle", "L.", "" ], [ "Portella-Oberli", "M. T.", "" ], [ "Deveaud", "B.", "" ] ]
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712.1249
Rafael Villarreal H
Luis A. Dupont and Rafael H. Villarreal
Symbolic Rees algebras, vertex covers and irreducible representations of Rees cones
Algebra Discrete Math., to appear
Algebra Discrete Math. 10 (2010), no. 2, 64--86
null
null
math.AC math.CO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Let G be a simple graph and let J be its ideal of vertex covers. We give a graph theoretical description of the irreducible b-vertex covers of G, i.e., we describe the minimal generators of the symbolic Rees algebra of J. Then we study the irreducible b-vertex covers of the blocker of G, i.e., we study the minimal generators of the symbolic Rees algebra of the edge ideal of G. We give a graph theoretical description of the irreducible binary b-vertex covers of the blocker of G. It is shown that they correspond to irreducible induced subgraphs of G. As a byproduct we obtain a method, using Hilbert bases, to obtain all irreducible induced subgraphs of G. In particular we obtain all odd holes and antiholes. We study irreducible graphs and give a method to construct irreducible b-vertex covers of the blocker of G with high degree relative to the number of vertices of G.
[ { "version": "v1", "created": "Sat, 8 Dec 2007 00:46:08 GMT" }, { "version": "v2", "created": "Fri, 27 Feb 2009 04:11:19 GMT" }, { "version": "v3", "created": "Wed, 4 Mar 2009 18:54:01 GMT" } ]
2011-03-08T00:00:00
[ [ "Dupont", "Luis A.", "" ], [ "Villarreal", "Rafael H.", "" ] ]
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712.125
Surjeet Rajendran
Savas Dimopoulos, Peter W. Graham, Jason M. Hogan, Mark A. Kasevich, Surjeet Rajendran
Gravitational Wave Detection with Atom Interferometry
5 pages, 5 figures, updated with journal reference
Physics Letters B 678 (2009), pp. 37-40
10.1016/j.physletb.2009.06.011
null
gr-qc astro-ph hep-ph hep-th physics.atom-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We propose two distinct atom interferometer gravitational wave detectors, one terrestrial and another satellite-based, utilizing the core technology of the Stanford $10 \text{m}$ atom interferometer presently under construction. The terrestrial experiment can operate with strain sensitivity $ \sim \frac{10^{-19}}{\sqrt{\text{Hz}}}$ in the 1 Hz - 10 Hz band, inaccessible to LIGO, and can detect gravitational waves from solar mass binaries out to megaparsec distances. The satellite experiment probes the same frequency spectrum as LISA with better strain sensitivity $ \sim \frac{10^{-20}}{\sqrt{\text{Hz}}}$. Each configuration compares two widely separated atom interferometers run using common lasers. The effect of the gravitational waves on the propagating laser field produces the main effect in this configuration and enables a large enhancement in the gravitational wave signal while significantly suppressing many backgrounds. The use of ballistic atoms (instead of mirrors) as inertial test masses improves systematics coming from vibrations and acceleration noise, and reduces spacecraft control requirements.
[ { "version": "v1", "created": "Sat, 8 Dec 2007 04:32:38 GMT" }, { "version": "v2", "created": "Mon, 22 Jun 2009 15:29:48 GMT" } ]
2009-06-22T00:00:00
[ [ "Dimopoulos", "Savas", "" ], [ "Graham", "Peter W.", "" ], [ "Hogan", "Jason M.", "" ], [ "Kasevich", "Mark A.", "" ], [ "Rajendran", "Surjeet", "" ] ]
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712.1251
Dima Feldman
K. T. Law and D. E. Feldman
Quantum Phase Transition between (Luttinger) Liquid and Gas of Cold Molecules
5 pages; 3 figures
Phys. Rev. Lett. 101, 096401 (2008)
10.1103/PhysRevLett.101.096401
null
cond-mat.other cond-mat.str-el
null
We consider cold polar molecules confined in a helical optical lattice similar to those used in holographic microfabrication. An external electric field polarizes molecules along the axis of the helix. The large-distance inter-molecular dipolar interaction is attractive but the short-scale interaction is repulsive due to geometric constraints and thus prevents collapse. The interaction strength depends on the electric field. We show that a zero-temperature second-order liquid-gas transition occurs at a critical field. It can be observed under experimentally accessible conditions.
[ { "version": "v1", "created": "Sat, 8 Dec 2007 01:09:54 GMT" }, { "version": "v2", "created": "Wed, 12 Dec 2007 00:00:52 GMT" } ]
2009-11-13T00:00:00
[ [ "Law", "K. T.", "" ], [ "Feldman", "D. E.", "" ] ]
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712.1252
Anirban Basu
Anirban Basu
The D^6 R^4 term in type IIB string theory on T^2 and U-duality
42 pages, LaTeX
Phys.Rev.D77:106004,2008
10.1103/PhysRevD.77.106004
null
hep-th
null
We propose a manifestly U-duality invariant modular form for the D^6 R^4 interaction in the effective action of type IIB string theory compactified on T^2. It receives perturbative contributions upto genus three, as well as non-perturbative contributions from D-instantons and (p,q) string instantons wrapping T^2. Our construction is based on constraints coming from string perturbation theory, U-duality, the decompactification limit to ten dimensions, and the equality of the perturbative part of the amplitude in type IIA and type IIB string theories. Using duality, parts of the perturbative amplitude are also shown to match exactly the results obtained from eleven dimensional supergravity compactified on T^3 at one loop. We also obtain parts of the genus one and genus k amplitudes for the D^{2k} R^4 interaction for arbitrary k > 3. We enhance a part of this amplitude to a U-duality invariant modular form.
[ { "version": "v1", "created": "Sat, 8 Dec 2007 02:03:54 GMT" } ]
2008-11-26T00:00:00
[ [ "Basu", "Anirban", "" ] ]
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712.1253
Qijin Chen
Qijin Chen and K. Levin
Understanding the Protected Nodes and Collapse of the Fermi Arcs in Underdoped Cuprate Superconductors
4 pages, 4 figures, replaced with updated version
Phys. Rev. B 78, 020513(R) (2008)
10.1103/PhysRevB.78.020513
null
cond-mat.supr-con cond-mat.str-el
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We show how recent angle resolved photoemission measurements addressing the Fermi arcs in the cuprates reveal a very natural phenomenological description of the complex superfluid phase. Importantly, this phenomenology is consistent with a previously presented microscopic theory. By distinguishing the order parameter and the excitation gap, we are able to demonstrate how the collapse of the arcs below $T_c$ into well defined nodes is associated with the \emph{smooth} emergence of superconducting coherence. Comparison of this theory with experiment shows good semi-quantitative agreement.
[ { "version": "v1", "created": "Mon, 10 Dec 2007 06:51:47 GMT" }, { "version": "v2", "created": "Wed, 27 Feb 2008 21:00:16 GMT" }, { "version": "v3", "created": "Fri, 1 Aug 2008 06:09:10 GMT" } ]
2008-08-01T00:00:00
[ [ "Chen", "Qijin", "" ], [ "Levin", "K.", "" ] ]
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712.1254
Dimitri Skliros P
Dimitri Skliros and Mark Hindmarsh
Large Radius Hagedorn Regime in String Gas Cosmology
12 pages, 4 figures, more details presented in string thermodynamics section, to be published in Physical Review D
Phys.Rev.D78:063539,2008
10.1103/PhysRevD.78.063539
null
hep-th
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We calculate the equation of state of a gas of strings at high density in a large toroidal universe, and use it to determine the cosmological evolution of background metric and dilaton fields in the entire large radius Hagedorn regime, (ln S)^{1/d} << R << S^{1/d} (with S the total entropy). The pressure in this regime is not vanishing but of O(1), while the equation of state is proportional to volume, which makes our solutions significantly different from previously published approximate solutions. For example, we are able to calculate the duration of the high-density "Hagedorn" phase, which increases exponentially with increasing entropy, S. We go on to discuss the difficulties of the scenario, quantifying the problems of establishing thermal equilibrium and producing a large but not too weakly-coupled universe.
[ { "version": "v1", "created": "Sun, 9 Dec 2007 00:11:01 GMT" }, { "version": "v2", "created": "Thu, 31 Jul 2008 23:06:54 GMT" } ]
2008-09-26T00:00:00
[ [ "Skliros", "Dimitri", "" ], [ "Hindmarsh", "Mark", "" ] ]
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712.1255
Artur Adib
Artur B. Adib
Stochastic actions for diffusive dynamics: Reweighting, sampling, and minimization
9 pages, 6 figures; in press (J. Phys. Chem. B)
J. Phys. Chem. B 112, 5910 (2008)
10.1021/jp0751458
null
cond-mat.stat-mech
null
In numerical studies of diffusive dynamics, two different action functionals are often used to specify the probability distribution of trajectories, one of which requiring the evaluation of the second derivative of the potential in addition to the force. Here it is argued that both actions are equivalent prescriptions for the purposes of reweighting and sampling trajectories, whereas the most probable path is more generally given by the global minimum of the action involving the second derivative term. The answer to this apparent paradox lies in the non-differentiable character of Brownian paths, as well as in the "entropy" associated with a given trajectory.
[ { "version": "v1", "created": "Mon, 10 Dec 2007 18:30:57 GMT" } ]
2008-10-28T00:00:00
[ [ "Adib", "Artur B.", "" ] ]
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712.1256
Muhammad Sharif
M. Sharif and M. Jamil Amir
Teleparallel Energy-Momentum Distribution of Spatially Homogeneous Rotating Spacetimes
12 pages, accepted for publication in Int. J. Theor. Phys
Int.J.Theor.Phys.47:1742-1750,2008
10.1007/s10773-007-9616-7
null
gr-qc
null
The energy-momentum distribution of spatially homogeneous rotating spacetimes in the context of teleparallel theory of gravity is investigated. For this purpose, we use the teleparallel version of Moller prescription. It is found that the components of energy-momentum density are finite and well-defined but are different from General Relativity. However, the energy-momentum density components become the same in both theories under certain assumptions. We also analyse these quantities for some special solutions of the spatially homogeneous rotating spacetimes.
[ { "version": "v1", "created": "Sat, 8 Dec 2007 03:19:30 GMT" } ]
2008-11-26T00:00:00
[ [ "Sharif", "M.", "" ], [ "Amir", "M. Jamil", "" ] ]
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712.1257
Xiaobing Luo
Xiaobing Luo, Qiongtao Xie, and Biao Wu
Quasi-energies and Floquet states of two weakly coupled Bose-Einstein condensates under periodic driving
8pages,12figures
PhysRevA, 77, 053601(2008)
10.1103/PhysRevA.77.053601
null
cond-mat.other
null
We investigate the quasi-energies and Floquet states of two weakly coupled Bose-Einstein condensates driven by a periodic force. The quasi-energies and Floquet states of this system are computed within two different theoretical frameworks: the mean-field model and the second-quantized model. The mean-field approach reveals a triangular structure in the quasi-energy band. Our analysis of the corresponding Floquet states shows that this triangle signals the onset of a localization phenomenon, which can be regarded as a generalization of the well-known phenomenon called coherent destruction of tunneling. With the second quantized model, we find also a triangular structure in the quantum quasi-energy band, which is enveloped by the mean-field triangle. The close relation between these two sets of quasi-energies is further explored by a semi-classical method. With a Sommerfeld rule generalized to time-dependent systems, the quantum quasi-energies are computed by quantizing semiclassically the mean-field model and they are found to agree very well with the results obtained directly with the second-quantized model.
[ { "version": "v1", "created": "Sat, 8 Dec 2007 03:24:27 GMT" } ]
2013-05-07T00:00:00
[ [ "Luo", "Xiaobing", "" ], [ "Xie", "Qiongtao", "" ], [ "Wu", "Biao", "" ] ]
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712.1258
Vasileios Paschalidis
Vasileios Paschalidis, Jakob Hansen, and Alexei Khokhlov
Numerical performance of the parabolized ADM (PADM) formulation of General Relativity
20 two column pages, 20 figures, submitted to PRD, two typos corrected
Phys.Rev.D78:064048,2008
10.1103/PhysRevD.78.064048
null
gr-qc
null
In a recent paper the first coauthor presented a new parabolic extension (PADM) of the standard 3+1 Arnowitt, Deser, Misner formulation of the equations of general relativity. By parabolizing first-order ADM in a certain way, the PADM formulation turns it into a mixed hyperbolic - second-order parabolic, well-posed system. The surface of constraints of PADM becomes a local attractor for all solutions and all possible well-posed gauge conditions. This paper describes a numerical implementation of PADM and studies its accuracy and stability in a series of standard numerical tests. Numerical properties of PADM are compared with those of standard ADM and its hyperbolic Kidder, Scheel, Teukolsky (KST) extension. The PADM scheme is numerically stable, convergent and second-order accurate. The new formulation has better control of the constraint-violating modes than ADM and KST.
[ { "version": "v1", "created": "Sat, 8 Dec 2007 04:36:22 GMT" }, { "version": "v2", "created": "Tue, 11 Dec 2007 22:27:25 GMT" } ]
2009-02-23T00:00:00
[ [ "Paschalidis", "Vasileios", "" ], [ "Hansen", "Jakob", "" ], [ "Khokhlov", "Alexei", "" ] ]
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712.1259
Stefan Boettcher
S. Boettcher and B. Goncalves (Emory U), H. Guclu (Los Alamos)
Hierarchical, Regular Small-World Networks
9 pages, final version for JPA FastTrack, find related articles at http://www.physics.emory.edu/faculty/boettcher
J. Phys. A: Math. Theor. 41, 252001 (2008)
10.1088/1751-8113/41/25/252001
null
cond-mat.dis-nn
null
Two new classes of networks are introduced that resemble small-world properties. These networks are recursively constructed but retain a fixed, regular degree. They consist of a one-dimensional lattice backbone overlayed by a hierarchical sequence of long-distance links. Both types of networks, one 3-regular and the other 4-regular, lead to distinct behaviors, as revealed by renormalization group studies. The 3-regular networks are planar, have a diameter growing as \sqrt{N} with the system size N, and lead to super-diffusion with an exact, anomalous exponent d_w=1.3057581..., but possesses only a trivial fixed point T_c=0 for the Ising ferromagnet. In turn, the 4-regular networks are non-planar, have a diameter growing as ~2^[\sqrt(\log_2 N^2)], exhibit "ballistic" diffusion (d_w=1), and a non-trivial ferromagnetic transition, T_c>0. It suggest that the 3-regular networks are still quite "geometric", while the 4-regular networks qualify as true small-world networks with mean-field properties. As an example of an application we discuss synchronization of processors on these networks.
[ { "version": "v1", "created": "Sat, 8 Dec 2007 05:34:05 GMT" }, { "version": "v2", "created": "Thu, 29 May 2008 04:25:39 GMT" } ]
2008-05-29T00:00:00
[ [ "Boettcher", "S.", "", "Emory U" ], [ "Goncalves", "B.", "", "Emory U" ], [ "Guclu", "H.", "", "Los Alamos" ] ]
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712.126
Aalok Misra
Aalok Misra, Pramod Shukla
Large Volume Axionic Swiss-Cheese Inflation
1+15 pages, LaTeX; some errors corrected and now get number of e-foldings as 60 - this supersedes the published version
Nucl.Phys.B800:384-400,2008
10.1016/j.nuclphysb.2008.04.001
null
hep-th astro-ph gr-qc
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Continuing with the ideas of (section 4 of) [1], after inclusion of perturbative and non-perturbative alpha' corrections to the Kaehler potential and (D1- and D3-) instanton generated superpotential, we show the possibility of slow-roll axionic inflation in the large volume limit of Swiss-Cheese Calabi-Yau orientifold compactifications of type IIB string theory. We also include one- and two-loop corrections to the Kaehler potential but find the same to be subdominant to the (perturbative and non-perturbative) alpha' corrections. The NS-NS axions provide a flat direction for slow-roll inflation to proceed from a saddle point to the nearest dS minimum.
[ { "version": "v1", "created": "Sat, 8 Dec 2007 06:42:47 GMT" }, { "version": "v2", "created": "Thu, 24 Jan 2008 16:28:59 GMT" }, { "version": "v3", "created": "Wed, 6 Feb 2008 12:44:01 GMT" }, { "version": "v4", "created": "Fri, 4 Apr 2008 09:18:28 GMT" }, { "version": "v5", "created": "Wed, 4 Jun 2008 18:43:49 GMT" }, { "version": "v6", "created": "Sun, 22 Jun 2008 07:41:35 GMT" } ]
2008-11-26T00:00:00
[ [ "Misra", "Aalok", "" ], [ "Shukla", "Pramod", "" ] ]
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712.1261
David Tholen
David J. Tholen, Marc W. Buie, William M. Grundy, Garrett T. Elliott
Masses of Nix and Hydra
14 pages, 6 figures, 6 tables
null
10.1088/0004-6256/135/3/777
null
astro-ph
null
A four-body orbit solution for the Pluto system yields GM values of 870.3 +/- 3.7, 101.4 +/- 2.8, 0.039 +/- 0.034, and 0.021 +/- 0.042 km3 sec-2 for Pluto, Charon, Nix, and Hydra, respectively. Assuming a Charon-like density of 1.63 gm cm-3, the implied diameters for Nix and Hydra are 88 and 72 km, leading to visual geometric albedos of 0.08 and 0.18, respectively, though with considerable uncertainty. The eccentricity of Charon's orbit has a significant nonzero value; however, the 0.030 +/- 0.009 deg yr-1 rate at which the line of apsides precesses is insufficient to explain the difference in the longitude of periapsis seen in the orbits fitted to the 1992-1993 and 2002-2003 data sets. The mean orbital periods for Hydra, Nix, and Charon are in the ratios of 6.064 +/- 0.006 : 3.991 +/- 0.007 : 1, but we have not identified any resonant arguments that would indicate the existence of a mean motion resonance between any pairs of satellites.
[ { "version": "v1", "created": "Sat, 8 Dec 2007 07:26:14 GMT" } ]
2009-11-13T00:00:00
[ [ "Tholen", "David J.", "" ], [ "Buie", "Marc W.", "" ], [ "Grundy", "William M.", "" ], [ "Elliott", "Garrett T.", "" ] ]
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712.1262
Jan Kunes
Jan Kunes, Alexey V. Lukoyanov, Vladimir I. Anisimov, Richard T. Scalettar, and Warren E. Pickett
Magnetic Moment Collapse-Driven Mott Transition in MnO
18 pages, 5 figure
Nature Materials 7, 198 (2008)
10.1038/nmat2115
null
cond-mat.str-el cond-mat.mtrl-sci
null
The metal-insulator transition in correlated electron systems, where electron states transform from itinerant to localized, has been one of the central themes of condensed matter physics for more than half a century. The persistence of this question has been a consequence both of the intricacy of the fundamental issues and the growing recognition of the complexities that arise in real materials, even when strong repulsive interactions play the primary role. The initial concept of Mott was based on the relative importance of kinetic hopping (measured by the bandwidth) and on-site repulsion of electrons. Real materials, however, have many additional degrees of freedom that, as is recently attracting note, give rise to a rich variety of scenarios for a ``Mott transition.'' Here we report results for the classic correlated insulator MnO which reproduce a simultaneous moment collapse, volume collapse, and metallization transition near the observed pressure, and identify the mechanism as collapse of the magnetic moment due to increase of crystal field splitting, rather than to variation in the bandwidth.
[ { "version": "v1", "created": "Sat, 8 Dec 2007 07:20:23 GMT" } ]
2009-03-11T00:00:00
[ [ "Kunes", "Jan", "" ], [ "Lukoyanov", "Alexey V.", "" ], [ "Anisimov", "Vladimir I.", "" ], [ "Scalettar", "Richard T.", "" ], [ "Pickett", "Warren E.", "" ] ]
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712.1263
Kostas Kokkotas D
M. Vavoulidis, K. D. Kokkotas, A. Stavridis
Crustal Oscillations of Slowly Rotating Relativistic Stars
15 pages
Mon.Not.Roy.Astron.Soc.384:1711,2008.
10.1111/j.1365-2966.2007.12835.x
null
gr-qc astro-ph
null
We study low-amplitude crustal oscillations of slowly rotating relativistic stars consisting of a central fluid core and an outer thin solid crust. We estimate the effect of rotation on the torsional toroidal modes and on the interfacial and shear spheroidal modes. The results compared against the Newtonian ones for wide range of neutron star models and equations of state.
[ { "version": "v1", "created": "Sat, 8 Dec 2007 07:23:14 GMT" } ]
2009-11-13T00:00:00
[ [ "Vavoulidis", "M.", "" ], [ "Kokkotas", "K. D.", "" ], [ "Stavridis", "A.", "" ] ]
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712.1264
Ren-Gui Zhu
Ren-Gui Zhu and An-Min Wang
Theoretical construction of 1D anyon models
9 pages and one figure
null
null
null
cond-mat.stat-mech
null
One-dimensional anyon models are renewedly constructed by using path integral formalism. A statistical interaction term is introduced to realize the anyonic exchange statistics. The quantum mechanics formulation of statistical transmutation is presented.
[ { "version": "v1", "created": "Sat, 8 Dec 2007 07:47:11 GMT" } ]
2007-12-11T00:00:00
[ [ "Zhu", "Ren-Gui", "" ], [ "Wang", "An-Min", "" ] ]
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712.1265
Jean B. Dalibard
Zoran Hadzibabic (LKB - Lhomond), Peter Kr\"uger (LKB - Lhomond), Marc Cheneau (LKB - Lhomond), Steffen Patrick Rath (LKB - Lhomond), Jean Dalibard (LKB - Lhomond)
The trapped two-dimensional Bose gas: from Bose-Einstein condensation to Berezinskii-Kosterlitz-Thouless physics
23 pages, 7 figures, accepted for publication in New Journal of Physics. v3: Typos and acknowledgment section corrected
New Journal of Physics 10 (2008) 045006
10.1088/1367-2630/10/4/045006
null
cond-mat.other
null
We analyze the results of a recent experiment with bosonic rubidium atoms harmonically confined in a quasi-two-dimensional geometry. In this experiment a well defined critical point was identified, which separates the high-temperature normal state characterized by a single component density distribution, and the low-temperature state characterized by a bimodal density distribution and the emergence of high-contrast interference between independent two-dimensional clouds. We first show that this transition cannot be explained in terms of conventional Bose-Einstein condensation of the trapped ideal Bose gas. Using the local density approximation, we then combine the mean-field (MF) Hartree-Fock theory with the prediction for the Berezinskii-Kosterlitz-Thouless transition in an infinite uniform system. If the gas is treated as a strictly 2D system, the MF predictions for the spatial density profiles significantly deviate from those of a recent Quantum Monte-Carlo (QMC) analysis. However when the residual thermal excitation of the strongly confined degree of freedom is taken into account, an excellent agreement is reached between the MF and the QMC approaches. For the interaction strength corresponding to the experiment, we predict a strong correction to the critical atom number with respect to the ideal gas theory (factor $\sim 2$). A quantitative agreement between theory and experiment is reached concerning the critical atom number if the predicted density profiles are used for temperature calibration.
[ { "version": "v1", "created": "Sat, 8 Dec 2007 07:50:51 GMT" }, { "version": "v2", "created": "Mon, 21 Jan 2008 19:26:46 GMT" }, { "version": "v3", "created": "Mon, 25 Feb 2008 15:45:58 GMT" } ]
2008-05-06T00:00:00
[ [ "Hadzibabic", "Zoran", "", "LKB - Lhomond" ], [ "Krüger", "Peter", "", "LKB - Lhomond" ], [ "Cheneau", "Marc", "", "LKB - Lhomond" ], [ "Rath", "Steffen Patrick", "", "LKB - Lhomond" ], [ "Dalibard", "Jean", "", "LKB - Lhomond" ] ]
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712.1266
Oswaldo Velasquez Castanon
Oswaldo Vel\'asquez Casta\~n\'on (IMB)
Majoration du nombre de z\'eros d'une fonction m\'eromorphe en dehors d'une droite verticale et applications
46 pages; 2 figures
null
null
null
math.NT math.CV
null
We study the distribution of the zeros of functions of the form $f(s)=h(s) \pm h(2a-s)$, where $h(s)$ is a meromorphic function, real on the real line, $a$ a real number. One of our results establishes sufficient conditions under which all but finitely many of the zeros of $f(s)$ lie on the line $\Re s = a$, called the {\it critical line} for the function $f(s)$, and be simple, given that all but finitely many of the zeros of $h(s)$ lie on the half-plane $\Re s < a$. This results can be regarded as a generalization of the necessary condition of stability for the function $h(s)$, in the Hermite-Biehler theorem. We apply this results to the study of translations of the Riemann Zeta Function and $L$ functions, and integrals of Eisenstein Series, among others.
[ { "version": "v1", "created": "Sat, 8 Dec 2007 07:52:17 GMT" } ]
2007-12-11T00:00:00
[ [ "Castañón", "Oswaldo Velásquez", "", "IMB" ] ]
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712.1267
Alexander V. Kuznetsov
A.V. Kuznetsov and N.V. Mikheev (Yaroslavl State P.G. Demidov University, Russia)
Plasma induced neutrino spin flip via the neutrino magnetic moment
4 pages, LaTeX, 1 eps figure, based on the talk presented at the 13th Lomonosov Conference on Elementary Particle Physics, Moscow State University, Moscow, Russia, August 23-29, 2007, submitted to the Proceedings
null
null
YARU-HE-07/04
hep-ph
null
The neutrino spin flip radiative conversion processes nu_L -> nu_R + gamma^* and nu_L + gamma^* -> nu_R in medium are considered. It is shown in part that an analysis of the so-called spin light of neutrino without a complete taking account of both the neutrino and the photon dispersion in medium is physically inconsistent.
[ { "version": "v1", "created": "Sat, 8 Dec 2007 08:47:44 GMT" } ]
2007-12-11T00:00:00
[ [ "Kuznetsov", "A. V.", "", "Yaroslavl State P.G. Demidov\n University, Russia" ], [ "Mikheev", "N. V.", "", "Yaroslavl State P.G. Demidov\n University, Russia" ] ]
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712.1268
Ricardo Faccio
Ricardo Faccio, Helena Pardo, Pablo A. Denis, Rodrigo Yoshikawa Oeiras, Fernando M. Ara\'ujo-Moreira, Marcos Ver\'issimo-Alves and Alvaro W. Mombr\'u
Induced magnetism by single carbon vacancies in a three-dimensional graphitic network: a supercell study
Phys. Rev. B v 76 (2007) accepted for publication
null
null
null
cond-mat.mtrl-sci
null
We present an ab initio DFT study of the magnetic moments that arise in graphite by creating single carbon vacancies in a 3-D graphite network, using a full potential, all electron, spin polarized electronic structure calculations. In previous reports the appearance of magnetic moments was explained in a 2-D graphene sheet just through the existence of the vacancies itself [1-5]. The dependence of the arising magnetic moment on the nature and geometry of the vacancies for different supercells is reported. We found that the highest value of magnetic moment is obtained for a 3x3x1 supercell and that the highly diluted 5x5x1 supercell shows no magnetic ordering. The results obtained in this manuscript are indicative of the importance of interlayer interactions present in a 3-D stacking. We conclude that this should not be underestimated when vacancies-based studies on magnetism in graphitic systems are carried out.
[ { "version": "v1", "created": "Sat, 8 Dec 2007 08:13:06 GMT" } ]
2007-12-11T00:00:00
[ [ "Faccio", "Ricardo", "" ], [ "Pardo", "Helena", "" ], [ "Denis", "Pablo A.", "" ], [ "Oeiras", "Rodrigo Yoshikawa", "" ], [ "Araújo-Moreira", "Fernando M.", "" ], [ "Veríssimo-Alves", "Marcos", "" ], [ "Mombrú", "Alvaro W.", "" ] ]
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712.1269
Dirk Oliver Theis
Dirk Oliver Theis
On the facial structure of Symmetric and Graphical Traveling Salesman Polyhedra
null
null
null
null
math.CO math.OC
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The Symmetric Traveling Salesman Polytope $S_n$ for a fixed number $n$ of cities is a face of the corresponding Graphical Traveling Salesman Polyhedron $P_n$. This has been used to study facets of $S_n$ using $P_n$ as a tool. In this paper, we study the operation of "rotating" (or "lifting") valid inequalities for $S_n$ to obtain a valid inequalities for $P_n$. As an application, we describe a surprising relationship between (a) the parsimonious property of relaxations of the Symmetric Traveling Salesman Polytope and (b) a connectivity property of the ridge graph of the Graphical Traveling Salesman Polyhedron.
[ { "version": "v1", "created": "Sat, 8 Dec 2007 08:29:45 GMT" }, { "version": "v2", "created": "Fri, 10 Apr 2009 01:55:11 GMT" } ]
2009-04-10T00:00:00
[ [ "Theis", "Dirk Oliver", "" ] ]
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712.127
Motohiko Ezawa
Motohiko Ezawa
Coulomb Blockade in Graphene Nanodisks
8 pages, 5 figures
Physical Review B 77, 155411 (2008)
10.1103/PhysRevB.77.155411
null
cond-mat.str-el cond-mat.mes-hall
null
Graphene nanodisk is a graphene derivative with a closed edge. The trigonal zigzag nanodisk with size $N$ has $N$-fold degenerated zero-energy states. We investigate electron-electron interaction effects in the zero-energy sector. We explicitely derive the direct and exchange interactions, which are found to have no SU($N$) symmetry. Then, regarding a nanodisk as a quantum dot with an internal degree of freedom, we analyze the nanodisk-lead system consisting of a nanodisk and two leads. Employing the standard Green function method, we reveal novel Coulomb blockade effects in the system. The occupation number in the nanodisk exhibits a peculiar series of plateaux and dips, reflecting a peculiar structure of energy spectrum of nanodisk without SU($N$) symmetry. Dips are argued to emerge due to a Coulomb correlation effect.
[ { "version": "v1", "created": "Sat, 8 Dec 2007 08:29:50 GMT" } ]
2008-04-10T00:00:00
[ [ "Ezawa", "Motohiko", "" ] ]
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712.1271
Patrice Ntumba Pungu
Anastasios Mallios, Patrice P. Ntumba
Fundamentals for Symplectic $\mathcal{A}$-modules
null
null
null
null
math.SG
null
Sheaf theoretically based Abstract Differential Geometry incorporates and generalizes all the classical differential geometry. Here, we undertake to partially explore the implications of Abstract Differential Geometry to classical symplectic geometry. The full investigation will be presented elsewhere.
[ { "version": "v1", "created": "Sat, 8 Dec 2007 09:14:57 GMT" } ]
2007-12-11T00:00:00
[ [ "Mallios", "Anastasios", "" ], [ "Ntumba", "Patrice P.", "" ] ]
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712.1272
Svetoslav Ivanov
P. A. Ivanov, B. T. Torosov, and N. V. Vitanov
Navigation between quantum states by quantum mirrors
9 pages, 6 figures
Phys. Rev. A 75, 012323 (2007)
10.1103/PhysRevA.75.012323
null
quant-ph
null
We introduce a technique that allows one to connect any two arbitrary (pure or mixed) superposition states of an N-state quantum system. The proposed solution to this inverse quantum mechanical problem is analytical, exact, and very compact. The technique uses standard and generalized quantum Householder reflections (QHRs), which require external pulses of precise areas and frequencies. We show that any two pure states can be linked by just a single generalized QHR. The transfer between any two mixed states with the same dynamic invariants (e.g., the same density matrix eigenvalues) requires in general N QHRs. Moreover, we propose recipes for synthesis of arbitrary preselected mixed states using a combination of QHRs and incoherent processes (pure dephasing or spontaneous emission).
[ { "version": "v1", "created": "Sat, 8 Dec 2007 09:31:16 GMT" } ]
2009-11-13T00:00:00
[ [ "Ivanov", "P. A.", "" ], [ "Torosov", "B. T.", "" ], [ "Vitanov", "N. V.", "" ] ]
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712.1273
Lorenzo Iorio
Lorenzo Iorio
Jupiter, Saturn and the Pioneer anomaly: a planetary-based independent test
Latex, 6 pages, no figures, no tables, 22 references. To appear in JGP (Journal of Gravitational Physics)
Journal of Gravitational Physics, vol. 1, no.1, pp. 5-8, 2007
null
null
gr-qc astro-ph hep-ph physics.space-ph
null
In this paper we use the ratio of the corrections to the standard Newtonian/Einsteinian secular precessions of the longitudes of perihelia of Jupiter and Saturn, recently estimated by the Russian astronomer E.V. Pitjeva by fitting almost one century of data with the EPM ephemerides, to make an independent, planetary-based test of the hypothesis that the Pioneer anomaly (PA), as it is presently known in the 5-10 AU region, is of gravitational origin. Accounting for the errors in the determined apsidal extra-rates and in the values of the PA acceleration at the orbits of Jupiter and Saturn the answer is negative. If and when the re-analysis of the entire Pioneer 10/11 will be completed more firm conclusions could be reached. Moreover, it would also be important that other teams of astronomers estimate independently their own corrections to the perihelion precessions.
[ { "version": "v1", "created": "Sat, 8 Dec 2007 10:31:43 GMT" } ]
2007-12-15T00:00:00
[ [ "Iorio", "Lorenzo", "" ] ]
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712.1274
Carlo Ferrigno
Carlo Ferrigno, Alberto Segreto, Teresa Mineo, Andrea Santangelo and R\"udiger Staubert
INTEGRAL observation of the accreting pulsar 1E1145.1-6141
Accepted for publication on Astronomy and Astrophysics
null
10.1051/0004-6361:20078643
null
astro-ph
null
We analyze 1050 ks of INTEGRAL data of the high mass X-ray binary pulsar 1E 1145.1-6141 to study its properties over a long time baseline, from June 2003 to June 2004, with wide spectral coverage. We study three high luminosity episodes, two of them at the system apoastron, three brightening with lower intensity, two at the periastron, and one extended period of intermediate luminosity spanning one orbital cycle. We perform timing analysis to determine the pulse period and pulse profiles at different energy ranges. We also analyze the broad band phase average spectrum of different luminosity states and perform phase resolved spectroscopy for the first flare. From the timing analysis, we find a pulse period of ~297 s around MJD 53000 with a significant scatter around the mean value. From the spectral analysis we find that the source emission can be described by an absorbed bremsstrahlung model in which the electron temperature varies between ~25 and ~37 keV, without any correlation to luminosity, and the intrinsic absorbing column is constantly of the order of 10^23 cm^-2. Phase resolved spectral analysis evidences a different temperature of the plasma in the ascending and descending edges of the pulse during the first flare. This justifies the pulse maximum shift by ~0.4 phase units between 20 and 100 keV observed in the pulse profiles. The comparison with the previous period measurements reveals that the source is currently spinning-down, in contrast to the long term secular trend observed so far indicating that at least a temporary accretion disk is formed. The study of the spectral property variations with respect to time and spin phase suggests the presence of two emitting components at different temperatures whose relative intensity varies with time.
[ { "version": "v1", "created": "Sat, 8 Dec 2007 10:52:49 GMT" } ]
2009-11-13T00:00:00
[ [ "Ferrigno", "Carlo", "" ], [ "Segreto", "Alberto", "" ], [ "Mineo", "Teresa", "" ], [ "Santangelo", "Andrea", "" ], [ "Staubert", "Rüdiger", "" ] ]
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712.1275
Vladimir Vovk
Vladimir Vovk
Continuous-time trading and emergence of randomness
14 pages; this version: new references and minor corrections
Stochastics 81, 455 - 466 (2009)
10.1080/17442500802221712
null
q-fin.TR math.PR
null
A new definition of events of game-theoretic probability zero in continuous time is proposed and used to prove results suggesting that trading in financial markets results in the emergence of properties usually associated with randomness. This paper concentrates on "qualitative" results, stated in terms of order (or order topology) rather than in terms of the precise values taken by the price processes (assumed continuous).
[ { "version": "v1", "created": "Sat, 8 Dec 2007 10:53:26 GMT" }, { "version": "v2", "created": "Sun, 30 Dec 2007 14:50:50 GMT" } ]
2010-11-25T00:00:00
[ [ "Vovk", "Vladimir", "" ] ]
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712.1276
Yoshiyuki Fukumoto
Shotaro Morohoshi and Yoshiyuki Fukumoto
Superconductivity in the Three-Fold Charge-Ordered Metal of the Triangular-Lattice Extended Hubbard Model
4 pages, 7 figures
null
10.1143/JPSJ.77.023708
null
cond-mat.supr-con
null
The quarter-filling extended Hubbard model on the triangular lattice is studied to explore pairing instability in the three-fold charge-ordered (CO) metal. We derive a second-order strong-coupling effective Hamiltonian of doped carriers into the three-fold CO insulator at electron density of $n=2/3$, and then study the $f$- and $d_{xy}$-wave superconductivities down to $n=1/2$ by using the BCS mean-field approximation. It is found that the triplet $f$-wave pairing is more stable than the $d_{xy}$-wave one. We also point out that this coexisting state of the charge ordering and superconductivity is possible to have critical temperature $T_c \sim 0.01 t$.
[ { "version": "v1", "created": "Sun, 9 Dec 2007 04:53:59 GMT" }, { "version": "v2", "created": "Thu, 27 Dec 2007 12:32:36 GMT" }, { "version": "v3", "created": "Fri, 28 Dec 2007 01:13:45 GMT" } ]
2015-05-13T00:00:00
[ [ "Morohoshi", "Shotaro", "" ], [ "Fukumoto", "Yoshiyuki", "" ] ]
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712.1277
Mikhail Kalenkov
Mikhail S. Kalenkov, Andrei D. Zaikin
Spin-resolved crossed Andreev reflection in ballistic heterostructures
9 pages, 7 figures; Published in the Proceeding of the International Workshop on Quantum Coherence, Noise and Decoherence in Nanostructures (DECONS'06)
Physica E 40, 147 (2007)
10.1016/j.physe.2007.05.019
null
cond-mat.supr-con
null
We theoretically analyze non-local effects in electron transport across three-terminal ballistic normal-superconducting-normal (NSN) structures with spin-active interfaces. Subgap electrons entering S-electrode from one N-metal may form Cooper pairs with their counterparts penetrating from another N-metal. This phenomenon of crossed Andreev reflection is highly sensitive to electron spins and yields a rich variety of properties of non-local conductance which we describe non-perturbatively at arbitrary interface transmissions, voltages and temperatures. Our results can be applied to hybrid structures with normal, ferromagnetic and half-metallic electrodes and can be directly tested in future experiments.
[ { "version": "v1", "created": "Sat, 8 Dec 2007 11:28:31 GMT" } ]
2007-12-11T00:00:00
[ [ "Kalenkov", "Mikhail S.", "" ], [ "Zaikin", "Andrei D.", "" ] ]
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712.1278
Sunil Maharaj
K. Komathiraj, S. D. Maharaj
Analytical models for quark stars
10 pages, To appear in Int. J. Mod. Phys. D
Int.J.Mod.Phys.D16:1803-1811,2007
10.1142/S0218271807011103
null
gr-qc
null
We find two new classes of exact solutions to the Einstein-Maxwell system of equations. The matter content satisfies a linear equation of state consistent with quark matter; a particular form of one of the gravitational potentials is specified to generate solutions. The exact solutions can be written in terms of elementary functions, and these can be related to quark matter in the presence of an electromagnetic field. The first class of solutions generalises the Mak and Harko model. The second class of solutions does not admit any singularities in the matter and gravitational potentials at the centre.
[ { "version": "v1", "created": "Sat, 8 Dec 2007 11:38:56 GMT" } ]
2008-11-26T00:00:00
[ [ "Komathiraj", "K.", "" ], [ "Maharaj", "S. D.", "" ] ]
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