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801.2773
Volodymyr B. Taranov
Volodymyr B. Taranov
Symmetry Extensions and Their Physical Reasons in the Kinetic and Hydrodynamic Plasma Models
This is a contribution to the Proc. of the Seventh International Conference ''Symmetry in Nonlinear Mathematical Physics'' (June 24-30, 2007, Kyiv, Ukraine), published in SIGMA (Symmetry, Integrability and Geometry: Methods and Applications) at http://www.emis.de/journals/SIGMA/
SIGMA 4 (2008), 006, 7 pages
10.3842/SIGMA.2008.006
null
math-ph math.MP
null
Characteristic examples of continuous symmetries in hydrodynamic plasma theory (partial differential equations) and in kinetic Vlasov-Maxwell models (integro-differential equations) are considered. Possible symmetry extensions conditional and extended symmetries are discussed. Physical reasons for these symmetry extensions are clarified.
[ { "version": "v1", "created": "Thu, 17 Jan 2008 21:08:23 GMT" } ]
2008-04-25T00:00:00
[ [ "Taranov", "Volodymyr B.", "" ] ]
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801.2774
Jeremy Bailin
Jeremy Bailin and William E. Harris (McMaster)
Galaxy Concentrations are Trimodal
MNRAS in press
null
10.1111/j.1365-2966.2008.12985.x
null
astro-ph
null
We have analysed the distribution of inclination-corrected galaxy concentrations in the Sloan Digital Sky Survey. We find that unlike most galaxy properties, which are distributed bimodally, the distribution of concentrations is trimodal: it exhibits three distinct peaks. The newly-discovered intermediate peak, which consists of early-type spirals and lenticulars, may contain ~60% of the number density and ~50% of the luminosity density of M_r < -17 galaxies in the local universe. These galaxies are generally red and quiescent, although the distribution contains a tail of blue star-forming galaxies and also shows evidence of dust. The intermediate-type galaxies have higher apparent ellipticities than either disc or elliptical galaxies, most likely because some of the face-on intermediate types are misidentified as ellipticals. Their physical half-light radii are smaller than the radii of either the disc or elliptical galaxies, which may be evidence that they form from disc fading. The existence of a distinct peak in parameter space associated with early-type spiral galaxies and lenticulars implies that they have a distinct formation mechanism and are not simply the smooth transition between disc-dominated and spheroid-dominated galaxies.
[ { "version": "v1", "created": "Thu, 17 Jan 2008 21:18:29 GMT" } ]
2009-11-13T00:00:00
[ [ "Bailin", "Jeremy", "", "McMaster" ], [ "Harris", "William E.", "", "McMaster" ] ]
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801.2775
Ivo de Medeiros Varzielas
Ivo de Medeiros Varzielas
Family symmetries and the origin of fermion masses and mixings
Doctoral thesis, 126 pages
null
null
Dphil thesis, University of Oxford (2007)
hep-ph
null
Family symmetries are possibly the most conservative extension of the Standard Model that attempt explanations of the pattern of fermion masses and mixings. The observed large mixing angles in the lepton sector may be the first signal for the presence of a non-Abelian family symmetry. We investigate the possibilities of simultaneously explaining the observed pattern of masses of the quarks (hierarchical masses and small mixing angles) and of the leptons (near tri-bi-maximal mixing, thus large mixing angles). We show that such contrasting observations can be achieved naturally via the seesaw mechanism, whether in models with continuous or discrete family symmetries. We consider also in some detail the constraints on flavour changing neutral currents arising from introducing a continuous family symmetry. We show that, for a restricted choice of the flavon sector, continuous family symmetries are consistent with even the most conservative limits both for the case of gauge mediated supersymmetry breaking and the case of gravity mediated supersymmetry breaking.
[ { "version": "v1", "created": "Thu, 17 Jan 2008 21:32:52 GMT" } ]
2008-01-21T00:00:00
[ [ "Varzielas", "Ivo de Medeiros", "" ] ]
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801.2776
William Graham
William Graham, Shrawan Kumar
On positivity in T-equivariant K-theory of flag varieties
null
null
null
null
math.AG math.RT
null
We prove some general results on the T-equivariant K-theory K_T(G/P) of the flag variety G/P, where G is a semisimple complex algebraic group, P is a parabolic subgroup and T$ is a maximal torus contained in P. In particular, we make a conjecture about a positivity phenomenon in K_T(G/P) for the product of two basis elements written in terms of the basis of K_T(G/P) given by the dual of the structure sheaf (of Schubert varieties) basis. (For the full flag variety G/B, this dual basis is closely related to the basis given by Kostant-Kumar.) This conjecture is parallel to (but different from) the conjecture of Griffeth-Ram for the structure constants of the product in the structure sheaf basis. We give explicit expressions for the product in the T-equivariant K-theory of projective spaces in terms of these bases. In particular, we establish our conjecture and the conjecture of Griffeth-Ram in this case.
[ { "version": "v1", "created": "Thu, 17 Jan 2008 21:28:13 GMT" } ]
2008-01-21T00:00:00
[ [ "Graham", "William", "" ], [ "Kumar", "Shrawan", "" ] ]
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801.2777
Lev Vaidman
L.Vaidman
The Elitzur-Vaidman Interaction-Free Measurements
An entry in the Compendium of Quantum Physics: Concepts, Experiments, History and Philosophy, ed. F. Weinert, K. Hentschel, D. Greenberger and B. Falkenburg
null
null
null
quant-ph
null
The interaction-free measurements proposed by Elitzur and Vaidman (EV IFM) is a quantum mechanical method to find an object that interacts with other systems solely via its explosion without exploding it. In this method, an object can be found without ``touching it'', i.e. without any particle being at its vicinity.
[ { "version": "v1", "created": "Thu, 17 Jan 2008 21:26:10 GMT" } ]
2008-01-21T00:00:00
[ [ "Vaidman", "L.", "" ] ]
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801.2778
Andrew Sutherland
Kiran S. Kedlaya and Andrew V. Sutherland
Computing L-series of hyperelliptic curves
15 pages, corrected minor typos
Algorithmic Number Theory 8th International Symposium, ANTS-VIII, Springer LNCS 5011, 2008, pp. 312-326
10.1007/978-3-540-79456-1_21
null
math.NT math.AG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We discuss the computation of coefficients of the L-series associated to a hyperelliptic curve over Q of genus at most 3, using point counting, generic group algorithms, and p-adic methods.
[ { "version": "v1", "created": "Thu, 17 Jan 2008 21:30:33 GMT" }, { "version": "v2", "created": "Mon, 21 Jan 2008 12:19:45 GMT" }, { "version": "v3", "created": "Tue, 20 May 2008 21:56:59 GMT" }, { "version": "v4", "created": "Mon, 3 Sep 2012 22:09:10 GMT" }, { "version": "v5", "created": "Sat, 28 May 2022 21:31:12 GMT" } ]
2022-05-31T00:00:00
[ [ "Kedlaya", "Kiran S.", "" ], [ "Sutherland", "Andrew V.", "" ] ]
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801.2779
Kimberly Scott
K. S. Scott (1), J. E. Austermann (1), T. A. Perera (1), G. W. Wilson (1), I. Aretxaga (2), J. J. Bock (3), D. H. Hughes (2), Y. Kang (4), S. Kim (4), P. D. Mauskopf (5), D. B. Sanders (6), N. Scoville (7), and M. S. Yun (1) ((1) University of Massachusetts, Amherst (2) Instituto Nacional de Astro\'fisica, \'Optica y Electr\'onica (3) Jet Propulsion Laboratory, California Institute of Technology (4) Sejong University (5) Cardiff University (6) University of Hawaii (7) California Institute of Technology)
AzTEC Millimetre Survey of the COSMOS Field: I. Data Reduction and Source Catalogue
16 pages, 12 figures, 2 tables, accepted for publication in MNRAS
MNRAS, Vol 385, Issue 4, 2225-2238, 2008
10.1111/j.1365-2966.2008.12989.x
null
astro-ph
null
We present a 1.1 mm wavelength imaging survey covering 0.3 sq. deg. in the COSMOS field. These data, obtained with the AzTEC continuum camera on the James Clerk Maxwell Telescope (JCMT), were centred on a prominent large-scale structure over-density which includes a rich X-ray cluster at z = 0.73. A total of 50 millimetre galaxy candidates, with a significance ranging from 3.5-8.5 sigma, are extracted from the central 0.15 sq. deg. area which has a uniform sensitivity of 1.3 mJy/beam. Sixteen sources are detected with S/N > 4.5, where the expected false-detection rate is zero, of which a surprisingly large number (9) have intrinsic (de-boosted) fluxes > 5 mJy at 1.1 mm. Assuming the emission is dominated by radiation from dust, heated by a massive population of young, optically-obscured stars, then these bright AzTEC sources have FIR luminosities > 6 x 10^12 L(sun) and star formation-rates > 1100 M(sun)/yr. Two of these nine bright AzTEC sources are found towards the extreme peripheral region of the X-ray cluster, whilst the remainder are distributed across the larger-scale over-density. We describe the AzTEC data reduction pipeline, the source-extraction algorithm, and the characterisation of the source catalogue, including the completeness, flux de-boosting correction, false-detection rate and the source positional uncertainty, through an extensive set of Monte-Carlo simulations. We conclude with a preliminary comparison, via a stacked analysis, of the overlapping MIPS 24 micron data and radio data with this AzTEC map of the COSMOS field.
[ { "version": "v1", "created": "Thu, 17 Jan 2008 21:48:56 GMT" } ]
2008-05-02T00:00:00
[ [ "Scott", "K. S.", "" ], [ "Austermann", "J. E.", "" ], [ "Perera", "T. A.", "" ], [ "Wilson", "G. W.", "" ], [ "Aretxaga", "I.", "" ], [ "Bock", "J. J.", "" ], [ "Hughes", "D. H.", "" ], [ "Kang", "Y.", "" ], [ "Kim", "S.", "" ], [ "Mauskopf", "P. D.", "" ], [ "Sanders", "D. B.", "" ], [ "Scoville", "N.", "" ], [ "Yun", "M. S.", "" ] ]
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801.278
Wolodymyr I. Skrypnik
Teunis C. Dorlas and Wolodymyr I. Skrypnik
Three Order Parameters in Quantum XZ Spin-Oscillator Models with Gibbsian Ground States
This is a contribution to the Proc. of the Seventh International Conference ''Symmetry in Nonlinear Mathematical Physics'', published in SIGMA (Symmetry, Integrability and Geometry: Methods and Applications) at http://www.emis.de/journals/SIGMA/ v2: sections 1 and 2 have been rewritten, the main result and the proof have not been changed
SIGMA 4 (2008), 007, 14 pages
10.3842/SIGMA.2008.007
null
cond-mat.stat-mech math-ph math.MP
null
Quantum models on the hyper-cubic d-dimensional lattice of spin-1/2 particles interacting with linear oscillators are shown to have three ferromagnetic ground state order parameters. Two order parameters coincide with the magnetization in the first and third directions and the third one is a magnetization in a continuous oscillator variable. The proofs use a generalized Peierls argument and two Griffiths inequalities. The class of spin-oscillator Hamiltonians considered manifest maximal ordering in their ground states. The models have relevance for hydrogen-bond ferroelectrics. The simplest of these is proven to have a unique Gibbsian ground state.
[ { "version": "v1", "created": "Thu, 17 Jan 2008 21:50:13 GMT" }, { "version": "v2", "created": "Mon, 18 Feb 2008 22:47:45 GMT" } ]
2008-04-25T00:00:00
[ [ "Dorlas", "Teunis C.", "" ], [ "Skrypnik", "Wolodymyr I.", "" ] ]
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801.2781
Robert W. Johnson Jr
Robert W. Johnson
Electric Fields in a Tokamak
This paper has been withdrawn by the author. Please see arXiv:0806.0780
null
null
null
physics.plasm-ph
null
With the establishment of vanishing net electrostatic fields in a toroidally symmetric tokamak at equilibrium [R. W. Johnson, to appear in Phys. Rev. D], one is left needing an explanation for the measurement of an apparent radial electric field in experiments. Two scenarios are proposed, depending on the type of measurement being considered. Indirect measurement via the radial equation of motion for an impurity species possibly measures that species' net radial viscous force, and direct measurement via the motional Stark effect might reveal electric fields generated by the shifting of the toroidal magnetic flux density.
[ { "version": "v1", "created": "Thu, 17 Jan 2008 22:02:25 GMT" }, { "version": "v2", "created": "Fri, 1 Feb 2008 17:25:10 GMT" }, { "version": "v3", "created": "Sat, 8 Jan 2011 15:19:49 GMT" } ]
2011-01-11T00:00:00
[ [ "Johnson", "Robert W.", "" ] ]
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801.2782
Eva Noyola
Eva Noyola (1,2), Karl Gebhardt (2), Marcel Bergmann (3) ((1) MPE, (2) UT Austin, (3) Gemini)
Gemini and Hubble Space Telescope Evidence for an Intermediate Mass Black Hole in omega Centauri
8 pages, 9 figures, ApJ accepted
null
10.1086/529002
null
astro-ph
null
The globular cluster omega Centauri is one of the largest and most massive members of the galactic system. However, its classification as a globular cluster has been challenged making it a candidate for being the stripped core of an accreted dwarf galaxy; this together with the fact that it has one of the largest velocity dispersions for star clusters in our galaxy makes it an interesting candidate for harboring an intermediate mass black hole. We measure the surface brightness profile from integrated light on an HST}/ACS image of the center, and find a central power-law cusp of logarithmic slope -0.08. We also analyze Gemini GMOS-IFU kinematic data for a 5x5 arcsec field centered on the nucleus of the cluster, as well as for a field 14 arcsecaway. We detect a clear rise in the velocity dispersion from 18.6 km/s at 14 arcsec to 23 km/s in the center. A rise in the velocity dispersion could be due to a central black hole, a central concentration of stellar remnants, or a central orbital structure that is radially biased. We discuss each of these possibilities. An isotropic, spherical dynamical model implies a black hole mass of 4.0^{+0.75}_{-1.0} times 10^4 M_sun, and excludes the no black hole case at greater than 99% significance. We have also run flattened, orbit-based models and find similar results. While our preferred model is the existence of a central black hole, detailed numerical simulations are required to confidently rule out the other possibilities.
[ { "version": "v1", "created": "Thu, 17 Jan 2008 22:16:12 GMT" } ]
2009-11-13T00:00:00
[ [ "Noyola", "Eva", "" ], [ "Gebhardt", "Karl", "" ], [ "Bergmann", "Marcel", "" ] ]
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801.2783
Grant Wilson
G. W. Wilson, J. E. Austermann, T. A. Perera, K. S. Scott, P. A. R. Ade, J. J. Bock, J. Glenn, S. R. Golwala, S. Kim, Y. Kang, D. Lydon, P. D. Mauskopf, C. R. Predmore, C. M. Roberts, K. Souccar, M. S. Yun
The AzTEC mm-Wavelength Camera
13 pages, 15 figures, accepted for publication in Monthly Notices
null
10.1111/j.1365-2966.2008.12980.x
null
astro-ph
null
AzTEC is a mm-wavelength bolometric camera utilizing 144 silicon nitride micromesh detectors. Herein we describe the AzTEC instrument architecture and its use as an astronomical instrument. We report on several performance metrics measured during a three month observing campaign at the James Clerk Maxwell Telescope, and conclude with our plans for AzTEC as a facility instrument on the Large Millimeter Telescope.
[ { "version": "v1", "created": "Thu, 17 Jan 2008 22:06:12 GMT" } ]
2009-11-13T00:00:00
[ [ "Wilson", "G. W.", "" ], [ "Austermann", "J. E.", "" ], [ "Perera", "T. A.", "" ], [ "Scott", "K. S.", "" ], [ "Ade", "P. A. R.", "" ], [ "Bock", "J. J.", "" ], [ "Glenn", "J.", "" ], [ "Golwala", "S. R.", "" ], [ "Kim", "S.", "" ], [ "Kang", "Y.", "" ], [ "Lydon", "D.", "" ], [ "Mauskopf", "P. D.", "" ], [ "Predmore", "C. R.", "" ], [ "Roberts", "C. M.", "" ], [ "Souccar", "K.", "" ], [ "Yun", "M. S.", "" ] ]
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801.2784
Joseph Wasem
Joseph Wasem
The nucleon magnetic moment in the epsilon-regime of HBChPT
null
null
null
NT@UW-08-02
hep-lat
null
The nucleon magnetic moment is calculated in the epsilon-regime of Heavy Baryon Chiral Perturbation Theory to order epsilon^3, using the method of collective variables to integrate nonperturbative pion zero modes. Contributions containing multiple sources of zero modes enter, allowing for charge-carrying zero mode pion fields that connect the sources. The result of this calculation will allow for lattice QCD calculations involving nucleons to systematically extract the leading low energy coefficients of Heavy Baryon Chiral Perturbation Theory with electromagnetic interactions.
[ { "version": "v1", "created": "Thu, 17 Jan 2008 22:09:28 GMT" } ]
2008-01-21T00:00:00
[ [ "Wasem", "Joseph", "" ] ]
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801.2785
Pavel Kovtun
Pavel Kovtun and Adam Ritz
Black holes and universality classes of critical points
4 pages; v2: references added, to appear in Phys. Rev. Lett
Phys.Rev.Lett.100:171606,2008
10.1103/PhysRevLett.100.171606
null
hep-th cond-mat.stat-mech
null
We argue that there exists an infinite class of conformal field theories in diverse dimensions, having a universal ratio of the central charge c to the normalized entropy density c'. The universality class includes all conformal theories which possess a classical gravity dual according to the AdS/CFT correspondence. From the practical point of view, the universality of c/c' provides an explicit test which can be applied to determine whether a given critical point may admit a dual description in terms of classical gravity.
[ { "version": "v1", "created": "Fri, 18 Jan 2008 17:10:16 GMT" }, { "version": "v2", "created": "Wed, 30 Apr 2008 22:12:52 GMT" } ]
2008-11-26T00:00:00
[ [ "Kovtun", "Pavel", "" ], [ "Ritz", "Adam", "" ] ]
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801.2786
Cosimo Bambi
Cosimo Bambi, Alexander D. Dolgov, Alexey A. Petrov
Primordial black holes and the observed Galactic 511 keV line
7 pages, 7 figures. v4: refereed version + erratum
Phys.Lett.B670:174-178,2008
10.1016/j.physletb.2008.10.057
WSU-HEP-0801
astro-ph hep-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The observed 511 keV line from the Galactic Bulge is a real challenge for theoretical astrophysics: despite a lot of suggested mechanisms, there is still no convincing explanation and the origin of the annihilated positrons remains unknown. Here we discuss the possibility that a population of slowly evaporating primordial black holes with the mass around $10^{16}-10^{17}$ g ejects (among other particles) low--energy positrons into the Galaxy. In addition to positrons, we have also calculated the spectrum and number density of photons and neutrinos produced by such black holes and found that the photons are potentially observable in the near future, while the neutrino flux is too weak and below the terrestrial and extra--terrestrial backgrounds. Depending on their mass distribution, such black holes could make a small fraction or the whole cosmological dark matter.
[ { "version": "v1", "created": "Thu, 17 Jan 2008 22:29:16 GMT" }, { "version": "v2", "created": "Fri, 25 Jan 2008 22:11:48 GMT" }, { "version": "v3", "created": "Wed, 29 Oct 2008 10:23:50 GMT" }, { "version": "v4", "created": "Sat, 17 Oct 2009 01:31:50 GMT" } ]
2009-10-17T00:00:00
[ [ "Bambi", "Cosimo", "" ], [ "Dolgov", "Alexander D.", "" ], [ "Petrov", "Alexey A.", "" ] ]
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801.2787
Paul Terry
P.W. Terry, M. Greenwald, J.-N. Leboeuf, G.R. McKee, D.R. Mikkelsen, W.M. Nevins, D.E. Newman, and D.P. Stotler
Validation in Fusion Research: Towards Guidelines and Best Practices
27 pages, 1 table, 6 figures
null
10.1063/1.2928909
null
physics.plasm-ph
null
Because experiment/model comparisons in magnetic confinement fusion have not yet satisfied the requirements for validation as understood broadly, a set of approaches to validating mathematical models and numerical algorithms are recommended as good practices. Previously identified procedures, such as verification, qualification, and analysis of error and uncertainty, remain important. However, particular challenges intrinsic to fusion plasmas and physical measurement therein lead to identification of new or less familiar concepts that are also critical in validation. These include the primacy hierarchy, which tracks the integration of measurable quantities, and sensitivity analysis, which assesses how model output is apportioned to different sources of variation. The use of validation metrics for individual measurements is extended to multiple measurements, with provisions for the primacy hierarchy and sensitivity. This composite validation metric is essential for quantitatively evaluating comparisons with experiments. To mount successful and credible validation in magnetic fusion, a new culture of validation is envisaged.
[ { "version": "v1", "created": "Thu, 17 Jan 2008 22:36:33 GMT" } ]
2009-11-13T00:00:00
[ [ "Terry", "P. W.", "" ], [ "Greenwald", "M.", "" ], [ "Leboeuf", "J. -N.", "" ], [ "McKee", "G. R.", "" ], [ "Mikkelsen", "D. R.", "" ], [ "Nevins", "W. M.", "" ], [ "Newman", "D. E.", "" ], [ "Stotler", "D. P.", "" ] ]
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801.2788
Eduardo Castro
Eduardo V. Castro, N. M. R. Peres, J. M. B. Lopes dos Santos
Magnetic structure at zigzag edges of graphene bilayer ribbons
6 pages, 4 figures
J. Optoelectron. Adv. Materials 10, 1716 (2008)
null
null
cond-mat.mes-hall
null
We study the edge magnetization of bilayer graphene ribbons with zigzag edges. The presence of flat edge-state bands at the Fermi energy of undoped bilayer, which gives rise to a strong peak in the density of states, makes bilayer ribbons magnetic at the edges even for very small on-site electronic repulsion. Working with the Hubbard model in the Hartree Fock approximation we show that the magnetic structure in bilayer ribbons with zigzag edges is ferromagnetic along the edge, involving sites of the two layers, and antiferromagnetic between opposite edges. It is also shown that this magnetic structure is a consequence of the nature of the edge states present in bilayer ribbons with zigzag edges. Analogously to the monolayer case, edge site magnetization as large as $m \approx0.2 \mu_{B}$ (per lattice site) even at small on-site Hubbard repulsion $U \approx 0.3 {eV}$ is realized in nanometer wide bilayer ribbons.
[ { "version": "v1", "created": "Thu, 17 Jan 2008 23:16:59 GMT" } ]
2008-07-22T00:00:00
[ [ "Castro", "Eduardo V.", "" ], [ "Peres", "N. M. R.", "" ], [ "Santos", "J. M. B. Lopes dos", "" ] ]
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801.2789
Gilles Halbout
Gilles Halbout
Quantization of $r-Z$-quasi-Poisson manifolds and related modified classical dynamical $r$-matrices
null
null
null
null
math.QA
null
Le $X$ be a $C^\infty$-manifold and $\g$ be a finite dimensional Lie algebra acting freely on $X$. Let $r \in \ve^2(\g)$ be such that $Z=[r,r] \in \ve^3(\g)^\g$. In this paper we prove that every quasi-Poisson $(\g,Z)$-manifold can be quantized. This is a generalization of the existence of a twist quantization of coboundary Lie bialgebras (\cite{EH}) in the case $X=G$ (where $G$ is the simply connected Lie group corresponding to $\g$). We deduce our result from a generalized formality theorem. In the case Z=0, we get a new proof of the existence of (equivariant) formality theorem and so (equivariant) quantization of Poisson manifold ({\it cf.} \cite{Ko,Do}). As a consequence of our results, we get quantization of modified classical dynamical $r$-matrices over abelian bases in the reductive case
[ { "version": "v1", "created": "Thu, 17 Jan 2008 23:10:32 GMT" } ]
2008-01-21T00:00:00
[ [ "Halbout", "Gilles", "" ] ]
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801.279
Mark Kliger
Mark Kliger and Joseph M. Francos
Strongly Consistent Model Order Selection for Estimating 2-D Sinusoids in Colored Noise
null
null
null
null
stat.ME math.ST stat.TH
null
We consider the problem of jointly estimating the number as well as the parameters of two-dimensional sinusoidal signals, observed in the presence of an additive colored noise field. We begin by elaborating on the least squares estimation of 2-D sinusoidal signals, when the assumed number of sinusoids is incorrect. In the case where the number of sinusoidal signals is under-estimated we show the almost sure convergence of the least squares estimates to the parameters of the dominant sinusoids. In the case where this number is over-estimated, the estimated parameter vector obtained by the least squares estimator contains a sub-vector that converges almost surely to the correct parameters of the sinusoids. Based on these results, we prove the strong consistency of a new model order selection rule.
[ { "version": "v1", "created": "Fri, 18 Jan 2008 06:56:25 GMT" } ]
2008-01-21T00:00:00
[ [ "Kliger", "Mark", "" ], [ "Francos", "Joseph M.", "" ] ]
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801.2791
Erik van Ooijen
S.K. Schnelle, E.D. van Ooijen, M.J. Davis, N.R. Heckenberg and H. Rubinsztein-Dunlop
Versatile two-dimensional potentials for ultra-cold atoms
8 pages, 5 figures
null
10.1364/OE.16.001405
null
physics.atom-ph
null
We propose and investigate a technique for generating smooth two-dimensional potentials for ultra-cold atoms based on the rapid scanning of a far-detuned laser beam using a two-dimensional acousto-optical modulator (AOM). We demonstrate the implementation of a feed-forward mechanism for fast and accurate control of the spatial intensity of the laser beam, resulting in improved homogeneity for the atom trap. This technique could be used to generate a smooth toroidal trap that would be useful for static and dynamic experiments on superfluidity and persistent currents with ultra-cold atoms.
[ { "version": "v1", "created": "Thu, 17 Jan 2008 23:18:13 GMT" } ]
2009-11-13T00:00:00
[ [ "Schnelle", "S. K.", "" ], [ "van Ooijen", "E. D.", "" ], [ "Davis", "M. J.", "" ], [ "Heckenberg", "N. R.", "" ], [ "Rubinsztein-Dunlop", "H.", "" ] ]
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801.2792
Daniel Reyes
D. Reyes, M. A. Continentino and Han-Ting Wang
Thermodynamic quantum crtical behavior in the anisotropic Kondo necklace model
12 pages and 3 figures
null
10.1016/j.jmmm.2008.09.010
null
cond-mat.str-el
null
The Ising-like anisotropy parameter $\delta$ in the Kondo necklace model is analyzed using the bond-operator method at zero and finite temperatures for arbitrary $d$ dimensions. A decoupling scheme on the double time Green's functions is used to find the dispersion relation for the excitations of the system. At zero temperature and in the paramagnetic side of the phase diagram, we determine the spin gap exponent $\nu z\approx0.5$ in three dimensions and anisotropy between $0\leq\delta\leq1$, a result consistent with the dynamic exponent $z=1$ for the Gaussian character of the bond-operator treatment. At low but finite temperatures, in the antiferromagnetic phase, the line of Neel transitions is calculated for $\delta\ll1$ and $\delta\approx1$. For $d>2$ it is only re-normalized by the anisotropy parameter and varies with the distance to the quantum critical point QCP $|g|$ as, $T_N \propto |g|^{\psi}$ where the shift exponent $\psi=1/(d-1)$. Nevertheless, in two dimensions, long range magnetic order occurs only at T=0 for any $\delta$. In the paramagnetic phase, we find a power law temperature dependence on the specific heat at the \textit{quantum liquid trajectory} $J/t=(J/t)_{c}$, $T\to0$. It behaves as $C_{V}\propto T^{d}$ for $\delta\leq 1$ and $\delta\approx1$, in concordance with the scaling theory for $z=1$.
[ { "version": "v1", "created": "Thu, 17 Jan 2008 23:21:38 GMT" } ]
2009-11-13T00:00:00
[ [ "Reyes", "D.", "" ], [ "Continentino", "M. A.", "" ], [ "Wang", "Han-Ting", "" ] ]
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801.2793
Jeff M Phillips
Jeff M. Phillips
Algorithms for eps-approximations of Terrains
24 pages. Long version to supplement conference version to appear in ICALP in May 2008
null
null
null
cs.CG
null
Consider a point set D with a measure function w : D -> R. Let A be the set of subsets of D induced by containment in a shape from some geometric family (e.g. axis-aligned rectangles, half planes, balls, k-oriented polygons). We say a range space (D, A) has an eps-approximation P if max {R \in A} | w(R \cap P)/w(P) - w(R \cap D)/w(D) | <= eps. We describe algorithms for deterministically constructing discrete eps-approximations for continuous point sets such as distributions or terrains. Furthermore, for certain families of subsets A, such as those described by axis-aligned rectangles, we reduce the size of the eps-approximations by almost a square root from O(1/eps^2 log 1/eps) to O(1/eps polylog 1/eps). This is often the first step in transforming a continuous problem into a discrete one for which combinatorial techniques can be applied. We describe applications of this result in geo-spatial analysis, biosurveillance, and sensor networks.
[ { "version": "v1", "created": "Fri, 18 Jan 2008 01:19:44 GMT" }, { "version": "v2", "created": "Fri, 9 May 2008 05:48:55 GMT" } ]
2008-05-09T00:00:00
[ [ "Phillips", "Jeff M.", "" ] ]
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801.2794
Max Karoubi
Max Karoubi (Paris University)
Clifford modules and twisted K-theory
5 pages,se also http://www.institut.math.jussieu.fr/~karoubi . To be published in the Proceedings of the International Conference on Clifford algebras (ICCA7)
null
null
null
math.KT hep-th math.AT
null
The purpose of this shord paper is to make the link between the fundamental work of Atiyah, Bott and Shapiro (MR0167985/29/5250) and twisted K-theory (MR0282363/43/8075). This link was implicit for a long time in the literature (for the description of the real K-theory of spheres as an example) but was not explicitly defined before.
[ { "version": "v1", "created": "Thu, 17 Jan 2008 23:49:59 GMT" } ]
2008-01-24T00:00:00
[ [ "Karoubi", "Max", "", "Paris University" ] ]
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801.2795
Daniel Reyes
D. Reyes, M. A. Continentino and A. Paduan-Filho
Bose-Einstein condensation in antiferromagnets close to the saturation field
4 pages, 1 figure. Accepted for publication in PRB,
null
10.1103/PhysRevB.77.052405
null
cond-mat.str-el
null
At zero temperature and strong applied magnetic fields the ground sate of an anisotropic antiferromagnet is a saturated paramagnet with fully aligned spins. We study the quantum phase transition as the field is reduced below an upper critical $H_{c2}$ and the system enters a XY-antiferromagnetic phase. Using a bond operator representation we consider a model spin-1 Heisenberg antiferromagnetic with single-ion anisotropy in hyper-cubic lattices under strong magnetic fields. We show that the transition at $H_{c2}$ can be interpreted as a Bose-Einstein condensation (BEC) of magnons. The theoretical results are used to analyze our magnetization versus field data in the organic compound $NiCl_2$-$4SC(NH_2)_2$ (DTN) at very low temperatures. This is the ideal BEC system to study this transition since $H_{c2}$ is sufficiently low to be reached with static magnetic fields (as opposed to pulsed fields). The scaling of the magnetization as a function of field and temperature close to $H_{c2}$ shows excellent agreement with the theoretical predictions. It allows to obtain the quantum critical exponents and confirm the BEC nature of the transition at $H_{c2}$.
[ { "version": "v1", "created": "Thu, 17 Jan 2008 23:43:20 GMT" }, { "version": "v2", "created": "Wed, 23 Jan 2008 19:37:35 GMT" } ]
2009-11-13T00:00:00
[ [ "Reyes", "D.", "" ], [ "Continentino", "M. A.", "" ], [ "Paduan-Filho", "A.", "" ] ]
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801.2796
Ahmet Guloglu
Ahmet M. Guloglu, C. Wesley Nevans
Sums with multiplicative functions over a Beatty sequence
null
null
null
null
math.NT
null
We study sums with multiplicative functions that take values over a non-homogenous Beatty sequence. We then apply our result in a few special cases to obtain asymptotic formulas such as the number of integers in a Beatty sequence representable as a sum of two squares up to a given magnitude.
[ { "version": "v1", "created": "Fri, 18 Jan 2008 00:13:14 GMT" } ]
2008-01-21T00:00:00
[ [ "Guloglu", "Ahmet M.", "" ], [ "Nevans", "C. Wesley", "" ] ]
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801.2797
Oded Schramm
Itai Benjamini, Oded Schramm, Asaf Shapira
Every Minor-Closed Property of Sparse Graphs is Testable
null
null
null
null
math.CO math.PR
null
Suppose $G$ is a graph with degrees bounded by $d$, and one needs to remove more than $\epsilon n$ of its edges in order to make it planar. We show that in this case the statistics of local neighborhoods around vertices of $G$ is far from the statistics of local neighborhoods around vertices of any planar graph $G'$ with the same degree bound. In fact, a similar result is proved for any minor-closed property of bounded degree graphs. As an immediate corollary of the above result we infer that many well studied graph properties, like being planar, outer-planar, series-parallel, bounded genus, bounded tree-width and several others, are testable with a constant number of queries, where the constant may depend on $\epsilon$ and $d$, but not on the graph size. None of these properties was previously known to be testable even with $o(n)$ queries.
[ { "version": "v1", "created": "Fri, 18 Jan 2008 00:34:36 GMT" }, { "version": "v2", "created": "Sun, 10 Feb 2008 20:37:24 GMT" } ]
2008-02-10T00:00:00
[ [ "Benjamini", "Itai", "" ], [ "Schramm", "Oded", "" ], [ "Shapira", "Asaf", "" ] ]
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801.2798
Dennis Dickerscheid
D. B. M. Dickerscheid, Y. Kawaguchi, M. Ueda
Heteronuclear fermionic superfluids with spin degrees of freedom
Submitted for publication in PRA
null
10.1103/PhysRevA.77.053605
null
cond-mat.stat-mech
null
We present a theory of spinor superfluidity in a two-species heteronuclear ultracold fermionic atomic gas consisting of arbitrary half-integer spin and one-half spin atoms. In particular, we focus on the magnetism of the superfluid phase and determine the possible phases in the absence of a magnetic field. Our work demonstrates similarities between heteronuclear fermionic superfluids and spinor Bose-Einstein condensates at the mean-field level. Possible experimental situations are discussed.
[ { "version": "v1", "created": "Fri, 18 Jan 2008 00:41:04 GMT" } ]
2009-11-13T00:00:00
[ [ "Dickerscheid", "D. B. M.", "" ], [ "Kawaguchi", "Y.", "" ], [ "Ueda", "M.", "" ] ]
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801.2799
Boris Pavlov
L. Petrova, B. Pavlov
Tectonic plate under a localized boundary stress: fitting of a zero-range solvable model
24 pages, 4 figures
null
10.1088/1751-8113/41/8/085206
null
math-ph math.MP
null
We suggest a method of fitting of a zero-range model of a tectonic plate under a boundary stress on the basis of comparison of the theoretical formulae for the corresponding eigenfunctions/eigenvalues with the results extraction under monitoring, in the remote zone, of non-random (regular) oscillations of the Earth with periods 0.2-6 hours, on the background seismic process, in case of low seismic activity. Observations of changes of the characteristics of the oscillations (frequency, amplitude and polarization) in course of time, together with the theoretical analysis of the fitted model, would enable us to localize the stressed zone on the boundary of the plate and estimate the risk of a powerful earthquake at the zone.
[ { "version": "v1", "created": "Fri, 18 Jan 2008 01:09:46 GMT" } ]
2009-11-13T00:00:00
[ [ "Petrova", "L.", "" ], [ "Pavlov", "B.", "" ] ]
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801.28
Paul Sheridan
Paul Sheridan, Yuichi Yagahara and Hidetoshi Shimodaira
A preferential attachment model with Poisson growth for scale-free networks
18 pages with 2 figures; correction to a proof in the appendix
Annals of the Institute of Statistical Mathematics 2008, Vol. 60, pp. 747-761
10.1007/s10463-008-0181-5
null
stat.AP
null
We propose a scale-free network model with a tunable power-law exponent. The Poisson growth model, as we call it, is an offshoot of the celebrated model of Barab\'{a}si and Albert where a network is generated iteratively from a small seed network; at each step a node is added together with a number of incident edges preferentially attached to nodes already in the network. A key feature of our model is that the number of edges added at each step is a random variable with Poisson distribution, and, unlike the Barab\'{a}si-Albert model where this quantity is fixed, it can generate any network. Our model is motivated by an application in Bayesian inference implemented as Markov chain Monte Carlo to estimate a network; for this purpose, we also give a formula for the probability of a network under our model.
[ { "version": "v1", "created": "Fri, 18 Jan 2008 01:23:45 GMT" }, { "version": "v2", "created": "Thu, 31 Jan 2008 01:20:26 GMT" } ]
2013-12-24T00:00:00
[ [ "Sheridan", "Paul", "" ], [ "Yagahara", "Yuichi", "" ], [ "Shimodaira", "Hidetoshi", "" ] ]
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801.2801
Simone Severini
Michael Batty, Andrea Casaccino, Andrew J. Duncan, Sarah Rees, Simone Severini
An application of the Deutsch-Josza algorithm to formal languages and the word problem in groups
14 pages, 2 EPS figure
null
null
null
quant-ph
null
We adapt the Deutsch-Josza algorithm to the context of formal language theory. Specifically, we use the algorithm to distinguish between trivial and nontrivial words in groups given by finite presentations, under the promise that a word is of a certain type. This is done by extending the original algorithm to functions of arbitrary length binary output, with the introduction of a more general concept of parity. We provide examples in which properties of the algorithm allow to reduce the number of oracle queries with respect to the deterministic classical case. This has some consequences for the word problem in groups with a particular kind of presentation.
[ { "version": "v1", "created": "Fri, 18 Jan 2008 01:39:42 GMT" }, { "version": "v2", "created": "Tue, 5 Feb 2008 20:21:12 GMT" } ]
2008-02-05T00:00:00
[ [ "Batty", "Michael", "" ], [ "Casaccino", "Andrea", "" ], [ "Duncan", "Andrew J.", "" ], [ "Rees", "Sarah", "" ], [ "Severini", "Simone", "" ] ]
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801.2802
Xiao-Pu Han
Xiao-Pu Han, Chun-Dong Hu, Zhi-Min Liu, Bing-Hong Wang
Parameter-tuning Networks: Experiments and Active Walk Model
4 pages, 5 figures
Published at Europhys. Lett. 83 (2008) 28003
10.1209/0295-5075/83/28003
null
physics.plasm-ph physics.data-an
null
The tuning process of a large apparatus of many components could be represented and quantified by constructing parameter-tuning networks. The experimental tuning of the ion source of the neutral beam injector of HT-7 Tokamak is presented as an example. Stretched-exponential cumulative degree distributions are found in the parameter-tuning networks. An active walk model with eight walkers is constructed. Each active walker is a particle moving with friction in an energy landscape; the landscape is modified by the collective action of all the walkers. Numerical simulations show that the parameter-tuning networks generated by the model also give stretched exponential functions, in good agreement with experiments. Our methods provide a new way and a new insight to understand the action of humans in the parameter-tuning of experimental processes, is helpful for experimental research and other optimization problems.
[ { "version": "v1", "created": "Fri, 18 Jan 2008 01:44:58 GMT" }, { "version": "v2", "created": "Thu, 28 Feb 2008 07:29:09 GMT" } ]
2008-09-28T00:00:00
[ [ "Han", "Xiao-Pu", "" ], [ "Hu", "Chun-Dong", "" ], [ "Liu", "Zhi-Min", "" ], [ "Wang", "Bing-Hong", "" ] ]
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801.2803
Kentaro Kojima
Kentaro Kojima, Kazunori Takenaga, and Toshifumi Yamashita
Multi-Higgs Mass Spectrum in Gauge-Higgs Unification
32 pages; typos corrected and a few comments added, published version
Phys.Rev.D77:075004,2008
10.1103/PhysRevD.77.075004
KYUSHU-HET-110, TU-808, OU-HET 595/2008
hep-ph
null
We study an SU(2) supersymmetric gauge model in a framework of gauge-Higgs unification. Multi-Higgs spectrum appears in the model at low energy. We develop a useful perturbative approximation scheme for evaluating effective potential to study the multi-Higgs mass spectrum. We find that both tree-massless and massive Higgs scalars obtain mass corrections of similar size from finite parts of the loop effects. The corrections modify multi-Higgs mass spectrum, and hence, the loop effects are significant in view of future verifications of the gauge-Higgs unification scenario in high-energy experiments.
[ { "version": "v1", "created": "Fri, 18 Jan 2008 08:38:39 GMT" }, { "version": "v2", "created": "Fri, 25 Jan 2008 09:23:36 GMT" }, { "version": "v3", "created": "Sun, 13 Apr 2008 08:27:53 GMT" } ]
2008-11-26T00:00:00
[ [ "Kojima", "Kentaro", "" ], [ "Takenaga", "Kazunori", "" ], [ "Yamashita", "Toshifumi", "" ] ]
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801.2804
Arindam Kundagrami
Arindam Kundagrami and M. Muthukumar
Theory of competitive counterion adsorption on flexible polyelectrolytes : Divalent salts
30 double-spaced pages (JCP type) and 12 figures
J. Chem. Phys., 128, 244901 (2008).
10.1063/1.2940199
null
cond-mat.soft cond-mat.stat-mech
null
Counterion distribution around an isolated flexible polyelectrolyte in the presence of a divalent salt is evaluated using the adsorption model [M. Muthukumar, J. Chem. Phys. {\bf 120}, 9343 (2004)] that considers Bjerrum length, salt concentration, and local dielectric heterogeneity as physical variables in the system. Self consistent calculations of effective charge and size of polymer show that divalent counterions replace condensed monovalent counterions in competitive adsorption. The theory further predicts that at modest physical conditions, polymer charge is compensated and reversed with increasing divalent salt. Consequently, the polyelectrolyte collapses and reswells, respectively. Lower temperatures and higher degrees of dielectric heterogeneity enhance condensation of all species of ions. Complete diagram of states for the effective charge calculated as functions of Coulomb strength and salt concentration suggest that (a) overcharging requires a minimum Coulomb strenth, and (b) progressively higher presence of salt recharges the polymer due to either electrostatic screening (low Coulomb strength) or negative coion condensation (high Coulomb strength). A simple theory of ion-bridging is also presented which predicts a first-order collapse of polyelectrolytes. The theoretical predictions are in agreement with generic results from experiments and simulations.
[ { "version": "v1", "created": "Fri, 18 Jan 2008 02:26:11 GMT" } ]
2008-12-29T00:00:00
[ [ "Kundagrami", "Arindam", "" ], [ "Muthukumar", "M.", "" ] ]
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801.2805
Weijun Zheng
Weijun Zheng, David Jewitt, and Ralf I. Kaiser
On the State of Water Ice on Saturn's Moon Titan and Implications to Icy Bodies in the Outer Solar System
23 pages, 5 figures
J.Phys.Chem.A113:11174,2009
10.1021/jp903817y
null
astro-ph astro-ph.EP physics.chem-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The crystalline state of water ice in the Solar System depends on the temperature history of the ice and the influence of energetic particles to which it has been exposed. We measured the infrared absorption spectra of amorphous and crystalline water ice in the 10-50 K and 10-140 K temperature range, respectively, and conducted a systematic experimental study to investigate the amorphization of crystalline water ice via ionizing radiation irradiation at doses of up to 160 \pm 30 eV per molecule. We found that crystalline water ice can be converted only partially to amorphous ice by electron irradiation. The experiments showed that a fraction of the 1.65 \mum band, which is characteristic for crystalline water ice, survived the irradiation, to a degree that strongly depends on the temperature. Quantitative kinetic fits of the temporal evolution of the 1.65 \mum band clearly demonstrate that there is a balance between thermal recrystallization and irradiation-induced amorphization, with thermal recrystallizaton dominant at higher temperatures. Our experiments show the amorphization at 40K was incomplete, in contradiction to Mastrapa and Brown's conclusion (Icarus 2006, 183, 207.). At 50 K, the recrystallization due to thermal effects is strong, and most of the crystalline ice survived. Temperatures of most icy objects in the Solar System, including Jovian satellites, Saturnian satellites (including Titan), and Kuiper Belt Objects, are equal to or above 50 K; this explains why water ice detected on those objects is mostly crystalline.
[ { "version": "v1", "created": "Fri, 18 Jan 2008 02:52:32 GMT" }, { "version": "v2", "created": "Sat, 26 Mar 2011 00:29:31 GMT" } ]
2011-03-31T00:00:00
[ [ "Zheng", "Weijun", "" ], [ "Jewitt", "David", "" ], [ "Kaiser", "Ralf I.", "" ] ]
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801.2806
Dong Liu
Dong Liu and Cuipo Jiang
Harish-Chandra Modules Over the Twisted Heisenberg-Virasoro Algebra
Latex, 15 pages
published in J. Math. Phys. 49(1)(2008)
10.1063/1.2834916
null
math.RT math-ph math.MP
null
In this paper, we classify all indecomposable Harish-Chandra modules of the intermediate series over the twisted Heisenberg-Virasoro algebra. Meanwhile, some bosonic modules are also studied.
[ { "version": "v1", "created": "Fri, 18 Jan 2008 03:08:20 GMT" } ]
2010-07-26T00:00:00
[ [ "Liu", "Dong", "" ], [ "Jiang", "Cuipo", "" ] ]
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801.2807
I Wayan Sudiarta
D.J. Wallace Geldart, I. Wayan Sudiarta, Glen Lesins, and Petr Chylek
Interaction between a Water Molecule and a Graphite Surface
19 pages, 5 figures
null
null
null
physics.comp-ph physics.chem-ph
null
The interaction energy between a water molecule and graphitic structured clusters terminated by hydrogen atoms is analyzed by ab initio methods and decomposed into electrostatic, induction, Pauli repulsion, and correlation energy contributions. Contributions to the energy which are due solely to the perimeter of the clusters are identified. These can be isolated and discarded which greatly simplifies the problem of extrapolation to the large cluster limit. The remaining terms are intrinsic to the interaction of a water molecule with real graphitic layers and an explicit analytical form is given for the potential energy surface. The minimum energy configuration is found to have both hydrogen atoms of the water molecule pointing symmetrically away from the graphitic plane. The electronic interaction in this mode is -16.8 +/- 1.7 kJ/mol for water-graphite and the zero point energy is estimated as 1.3 kJ/mol.
[ { "version": "v1", "created": "Fri, 18 Jan 2008 03:31:27 GMT" } ]
2008-01-21T00:00:00
[ [ "Geldart", "D. J. Wallace", "" ], [ "Sudiarta", "I. Wayan", "" ], [ "Lesins", "Glen", "" ], [ "Chylek", "Petr", "" ] ]
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801.2808
Hongbo Cheng
Hongbo Cheng, Yunqi Liu
The circular loop equation of a cosmic string with time-varying tension
8 pages, 3 figures. accepted by Modern Physics Letters A
Mod.Phys.Lett.A23:3023-3030,2008
10.1142/S0217732308026340
null
hep-th
null
The equation of circular loops of cosmic string with time-dependent tension is studied in the Minkowski spacetime and Robertson-Walker universe. We find that, in the case where the tension depends on some power of the cosmic time, cosmic string loops with time-varying tension should not collapse to form a black hole if the power is lower than a critical value.
[ { "version": "v1", "created": "Fri, 18 Jan 2008 03:37:20 GMT" } ]
2008-12-25T00:00:00
[ [ "Cheng", "Hongbo", "" ], [ "Liu", "Yunqi", "" ] ]
[ 0.0675040781, 0.0361799002, -0.004757538, -0.0257067718, -0.0644097403, 0.070074752, 0.0480573811, 0.0197799318, -0.0443679839, 0.038345933, -0.0521276183, -0.0278251991, -0.1180607304, -0.0022552931, 0.0330379605, 0.0422733575, -0.0058584064, 0.0260638092, 0.0381555147, 0.1438627094, -0.1133002117, -0.0435110889, 0.0664091557, 0.152622059, 0.0444869958, 0.00570369, 0.0461055711, 0.062553145, 0.0447250195, 0.030253062, 0.0240524933, -0.0571737625, -0.130533278, -0.0286344867, -0.0483668149, 0.2229824364, 0.040869005, 0.0516991727, 0.0526036695, -0.0497949682, -0.0669804215, -0.0364655294, -0.074311614, 0.0472004898, 0.0126510635, -0.0724074021, -0.0958767384, 0.1138714775, 0.0485810377, -0.0029812714, 0.0003008793, -0.0148289986, 0.0245880503, -0.0142220333, -0.123297289, -0.0431540534, -0.0145076644, 0.0487000495, -0.0084261084, -0.0875934437, 0.0002302154, -0.1101582721, -0.0476289354, -0.0711220652, -0.0713600889, -0.0290153287, -0.0655998737, -0.0383221321, -0.0560788438, 0.0702651739, -0.005278219, 0.0141863292, 0.0653618425, 0.1284386516, 0.0851655826, -0.0508898869, -0.0093960632, 0.0498425737, 0.0605537258, -0.0127700763, 0.0437729172, 0.0182208642, 0.053412959, 0.0362275057, -0.0555075854, 0.0646001622, -0.0199703537, -0.042820815, -0.097400099, 0.0551267415, 0.0045730681, 0.0110384403, -0.0270397142, -0.0428684205, 0.0173639711, -0.0317764245, -0.0108242165, 0.0463435948, 0.0648857951, 0.025302127, -0.0786436796, 0.0766918659, 0.0617438555, -0.0390600115, 0.1260583848, 0.06988433, -0.0325619094, -0.0430112369, -0.1095870137, 0.0226005372, 0.0676468909, 0.1326279044, -0.0231956001, -0.008128576, 0.055936031, -0.0191372633, -0.0691226497, -0.0293009579, -0.0712172762, -0.010461228, -0.0249688923, -0.0565072931, 0.1017797738, -0.0629815906, 0.0327761322, -0.061601039, -0.0050907736, 0.0031984698, -0.1454812884, 0.08564163, 0.0585067086, -0.0411546379, -0.0239334796, -0.0654570535, 0.0032252476, -0.0283250529, -0.0024114975, 0.0566977113, 0.1184415668, 0.05974444, 0.0516515672, -0.0874506235, 0.0211366788, -0.0040553622, 0.105112128, 0.1329135299, -0.0248022731, 0.024076296, 0.0282774474, 0.042320963, -0.0581258647, -0.0443679839, 0.0266826767, 0.0849275514, 0.0346089303, -0.0630291924, -0.0467244387, 0.0434396826, 0.042225752, 0.0860700756, -0.0350611806, 0.0673136562, -0.0483668149, 0.0523180403, 0.1321518421, -0.0317050181, 0.0407737941, -0.0207439363, -0.0351801924, -0.1611909717, 0.1042552367, -0.0767394751, -0.1607149243, 0.0360132828, 0.1181559339, 0.1072067544, -0.0599824674, -0.1044456586, 0.0013002151, 0.1496705413, 0.1250110716, 0.0349897705, 0.0338710509, -0.0128057804, -0.0629815906, -0.0021347927, 0.0093603591, -0.0130795101, 0.0692178607, -0.0440585501, -0.0863557085, 0.0268968996, 0.0594588108, -0.0235407371, -0.0518419892, -0.0641241148, -0.0017926308, 0.0473671071, -0.0024144729, 0.0535557717, 0.0071288687, 0.0646953732, 0.0211485792, -0.0858320519, -0.0267302822, -0.013864995, 0.0171616506, 0.1031127125, -0.1199649349, 0.029777009, 0.0456533208, 0.0054150838, 0.0456533208, -0.0022850463, -0.1167277843, -0.0004890683, -0.0264922567, 0.0539842211, 0.0668852106, -0.0085927267, -0.0692178607, 0.0986378342, 0.01985134, 0.0854512081, 0.053412959, -0.0259447973, -0.0712172762, 0.004665303, 0.0019651994, 0.0703603849, -0.0337996446, 0.0051740827, -0.0033085567, 0.0006404378, -0.0056769121, -0.0576974191, -0.0480811819, 0.0306100994, -0.0347755477, -0.0748352706, 0.0167451054, 0.0166498944, -0.0644573495, 0.0672184452, -0.0426303968, -0.0219102614, -0.0370367914, -0.0681229457, 0.0659807101, 0.0095686316, 0.0178757273, 0.059077967, 0.0239572823, 0.0039928802, -0.0148647027, 0.0343947075 ]
801.2809
Jingfei Zhang
Jingfei Zhang, Xin Zhang, Hongya Liu
Agegraphic dark energy as a quintessence
9 pages, 3 figures; accepted by Eur. Phys. J. C
Eur.Phys.J.C54:303-309,2008
10.1140/epjc/s10052-008-0532-7
null
astro-ph gr-qc hep-ph hep-th
null
Recently, a dark energy model characterized by the age of the universe, dubbed ``agegraphic dark energy'', was proposed by Cai. In this paper, a connection between the quintessence scalar-field and the agegraphic dark energy is established, and accordingly, the potential of the agegraphic quintessence field is constructed.
[ { "version": "v1", "created": "Fri, 18 Jan 2008 03:37:49 GMT" } ]
2009-06-23T00:00:00
[ [ "Zhang", "Jingfei", "" ], [ "Zhang", "Xin", "" ], [ "Liu", "Hongya", "" ] ]
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801.281
Hongbo Cheng
Hongbo Cheng
The Casimir force on a piston in the spacetime with extra compactified dimensions
11 pages, 2 figures
Phys.Lett.B668:72-77,2008
10.1016/j.physletb.2008.08.013
null
hep-th
null
A one-dimensional Casimir piston for massless scalar fields obeying Dirichlet boundary conditions in high-dimensional spacetimes within the frame of Kaluza-Klein theory is analyzed. We derive and calculate the exact expression for the Casimir force on the piston. We also compute the Casimir force in the limit that one outer plate is moved to the extremely distant place to show that the reduced force is associated with the properties of additional spatial dimensions. The more dimensionality the spacetime has, the stronger the extra-dimension influence is. The Casimir force for the piston in the model excluding one plate under the background with extra compactified dimensions always keeps attractive. Further we find that when the limit is taken the Casimir force between one plate and the piston will change to be the same form as the corresponding force for the standard system consisting of two parallel plates in the four-dimensional spacetimes if the ratio of the plate-piston distance and extra dimensions size is large enough.
[ { "version": "v1", "created": "Fri, 18 Jan 2008 03:42:50 GMT" } ]
2008-11-26T00:00:00
[ [ "Cheng", "Hongbo", "" ] ]
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801.2811
Ken Sasaki
Takahiro Ueda, Tsuneo Uematsu, and Ken Sasaki
Virtual Photon Structure Functions to NNLO in QCD
4 pages, 3 figures, uses photon2007.cls, Proceedings of Photon 2007 (Paris)
Nucl.Phys.Proc.Suppl.184:27-30,2008
10.1016/j.nuclphysbps.2008.09.129
KUNS-2121, YNU-HEPTh-07-103
hep-ph
null
The unpolarized virtual photon structure functions $F_2^\gamma(x,Q^2,P^2)$ and $F_L^\gamma(x,Q^2,P^2)$ are investigated in perturbative QCD for the kinematical region $\Lambda^2 \ll P^2 \ll Q^2$, where $-Q^2(-P^2)$ is the mass squared of the probe (target) photon and $\Lambda$ is the QCD scale parameter. In the framework of operator product expansion supplemented by the renormalization group method, the definite predictions are derived for the moments of $F_2^\gamma(x,Q^2,P^2)$ up to the next-to-next-to-leading order (the order $\alpha\alpha_s$) and for the moments of $F_L^\gamma(x,Q^2,P^2)$ up to the next-to-leading order (the order $\alpha\alpha_s$)
[ { "version": "v1", "created": "Fri, 18 Jan 2008 03:43:54 GMT" } ]
2008-12-18T00:00:00
[ [ "Ueda", "Takahiro", "" ], [ "Uematsu", "Tsuneo", "" ], [ "Sasaki", "Ken", "" ] ]
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801.2812
Lev A. Borisov
Lev Borisov, Zheng Hua
On the conjecture of King for smooth toric Deligne-Mumford stacks
28 pages, 7 figures; results strengthened to include arbitrary del Pezzo toric stacks
null
null
null
math.AG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We construct full strong exceptional collections of line bundles on smooth toric Fano Deligne-Mumford stacks of Picard number at most two and of any Picard number in dimension two. It is hoped that the approach of this paper will eventually lead to the proof of the existence of such collections on all smooth toric nef-Fano Deligne-Mumford stacks.
[ { "version": "v1", "created": "Fri, 18 Jan 2008 04:17:14 GMT" }, { "version": "v2", "created": "Sat, 1 Mar 2008 03:38:11 GMT" }, { "version": "v3", "created": "Mon, 14 Jul 2008 18:37:08 GMT" }, { "version": "v4", "created": "Wed, 24 Dec 2008 17:55:50 GMT" } ]
2008-12-24T00:00:00
[ [ "Borisov", "Lev", "" ], [ "Hua", "Zheng", "" ] ]
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801.2813
Shaoyu Yin
Shaoyu Yin and Ru-Keng Su
A consistent thermodynamic treatment for quark mass density-dependent model
18 pages, 2 figures
Phys.Rev.C77:055204,2008
10.1103/PhysRevC.77.055204
null
nucl-th
null
The ambiguities and inconsistencies in previous thermodynamic treatments for the quark mass density-dependent model are addressed. A new treatment is suggested to obtain the self-consistent results. A new independent variable of effective mass is introduced to make the traditional thermodynamic calculation with partial derivative still practicable. The contribution from physical vacuum has been discussed. We find that the properties of strange quark matter given by quark mass density-dependent model are nearly the same as those obtained by MIT bag model after considering the contribution of the physical vacuum.
[ { "version": "v1", "created": "Fri, 18 Jan 2008 04:06:12 GMT" } ]
2008-11-26T00:00:00
[ [ "Yin", "Shaoyu", "" ], [ "Su", "Ru-Keng", "" ] ]
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801.2814
Yi Hu
Yi Hu, Licai Deng, Richard deGrijs, Simon P. Goodwin, Qiang Liu
The binary fraction of the young cluster NGC 1818 in the Large Magellanic Cloud
30 pages, 9 figures
Astrophys.J.724:649-656,2010
10.1088/0004-637X/724/1/649
null
astro-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We use high-resolution {\sl Hubble Space Telescope} imaging observations of the young ($\sim 15-25$ Myr-old) star cluster NGC 1818 in the Large Magellanic Cloud to derive an estimate for the binary fraction of F stars ($1.3 < M_\star/M_\odot < 1.6$). This study provides the strongest constraints yet on the binary fraction in a young star cluster in a low-metallicity environment (${[Fe/H]} \sim -0.4$ dex). Employing artificial-star tests, we develop a simple method that can efficiently measure the probabilities of stellar blends and superpositions from the observed stellar catalog. We create synthetic color-magnitude diagrams matching the fundamental parameters of NGC 1818, with different binary fractions and mass-ratio distributions. We find that this method is sensitive to binaries with mass ratios, $q \ga 0.4$. For binaries with F-star primaries and mass ratios $q > 0.4$, the binary fraction is $\sim 0.35$. This suggests a total binary fraction for F stars of 0.55 to unity, depending on assumptions about the form of the mass-ratio distribution at low $q$.
[ { "version": "v1", "created": "Fri, 18 Jan 2008 04:08:25 GMT" }, { "version": "v2", "created": "Mon, 27 Sep 2010 08:06:29 GMT" } ]
2010-11-09T00:00:00
[ [ "Hu", "Yi", "" ], [ "Deng", "Licai", "" ], [ "deGrijs", "Richard", "" ], [ "Goodwin", "Simon P.", "" ], [ "Liu", "Qiang", "" ] ]
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801.2815
Jerome Kaminker
Ronald G. Douglas and Jerome Kaminker
Spectral multiplicity and odd K-theory
Typos fixed and application improved
null
null
null
math.KT
null
In this paper we begin a study of the space of unbounded self-adjoint Fredholm operators as a classifying space for K^{1}(X), with the goal of incorporating the information in the eigenspaces and eigenvalues of the operators. In particular, the role that the multiplicity of eigenvalues plays is developed here.
[ { "version": "v1", "created": "Fri, 18 Jan 2008 04:38:27 GMT" }, { "version": "v2", "created": "Fri, 30 May 2008 22:05:38 GMT" } ]
2008-05-31T00:00:00
[ [ "Douglas", "Ronald G.", "" ], [ "Kaminker", "Jerome", "" ] ]
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801.2816
Yuri Ralchenko
Yu. Ralchenko, I.N. Draganic, J.N. Tan, J.D. Gillaspy, J.M. Pomeroy, J. Reader, U. Feldman and G.E. Holland
EUV spectra of highly-charged ions W$^{54+}$-W$^{63+}$ relevant to ITER diagnostics
11 pages, 4 figures
J Phys B 41, 021003 (2008)
10.1088/0953-4075/41/2/021003
null
physics.atom-ph physics.plasm-ph
null
We report the first measurements and detailed analysis of extreme ultraviolet (EUV) spectra (4 nm to 20 nm) of highly-charged tungsten ions W$^{54+}$ to W$^{63+}$ obtained with an electron beam ion trap (EBIT). Collisional-radiative modelling is used to identify strong electric-dipole and magnetic-dipole transitions in all ionization stages. These lines can be used for impurity transport studies and temperature diagnostics in fusion reactors, such as ITER. Identifications of prominent lines from several W ions were confirmed by measurement of isoelectronic EUV spectra of Hf, Ta, and Au. We also discuss the importance of charge exchange recombination for correct description of ionization balance in the EBIT plasma.
[ { "version": "v1", "created": "Fri, 18 Jan 2008 04:48:27 GMT" } ]
2008-01-21T00:00:00
[ [ "Ralchenko", "Yu.", "" ], [ "Draganic", "I. N.", "" ], [ "Tan", "J. N.", "" ], [ "Gillaspy", "J. D.", "" ], [ "Pomeroy", "J. M.", "" ], [ "Reader", "J.", "" ], [ "Feldman", "U.", "" ], [ "Holland", "G. E.", "" ] ]
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801.2817
Yuri Ralchenko
Yu. Ralchenko, J. Reader, J.M. Pomeroy, J.N. Tan, and J.D. Gillaspy
Spectra of W$^{39+}$-W$^{47+}$ in the 12 nm to 20 nm region observed with an EBIT light source
19 pages, 8 figures
J Phys B 40, 3861 (2007)
10.1088/0953-4075/40/19/007
null
physics.atom-ph physics.plasm-ph
null
We observed spectra of highly ionized tungsten in the extreme ultraviolet with an electron beam ion trap (EBIT) and a grazing incidence spectrometer at the National Institute of Standards and Technology. Stages of ionization were distinguished by varying the energy of the electron beam between 2.1 keV and 4.3 keV and correlating the energies with spectral line emergence. The spectra were calibrated by reference lines of highly ionized iron produced in the EBIT. Identification of the observed lines was aided by collisional-radiative modeling of the EBIT plasma. Good quantitative agreement was obtained between the modeling results and the experimental observations. Our line identifications complement recent results for W$^{40+}$-W$^{45+}$ observed in a tokamak plasma by P\"{u}tterich {\it et al} (\jpb {\bf 38}, 3071, 2005). For most lines we agree with their assignment of ionization stage. Additionally, we present new identifications for some allowed and forbidden lines of W$^{39+}$, W$^{44+}$, W$^{46+}$, and W$^{47+}$. The uncertainties of our wavelengths range from 0.002 nm to 0.010 nm.
[ { "version": "v1", "created": "Fri, 18 Jan 2008 04:54:59 GMT" } ]
2008-01-21T00:00:00
[ [ "Ralchenko", "Yu.", "" ], [ "Reader", "J.", "" ], [ "Pomeroy", "J. M.", "" ], [ "Tan", "J. N.", "" ], [ "Gillaspy", "J. D.", "" ] ]
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801.2818
Kazuya Aokage
Kazuya Aokage, Hiroshi Mizukawa and Hiro-Fumi Yamada
Compound basis arising from the basic $A^{(1)}_{1}$-module
12 pages
null
10.1007/s11005-008-0248-5
null
math.RT
null
A new basis for the polynomial ring of infinitely many variables is constructed which consists of products of Schur functions and Q-functions. The transition matrix from the natural Schur function basis is investigated.
[ { "version": "v1", "created": "Fri, 18 Jan 2008 05:22:32 GMT" } ]
2009-11-13T00:00:00
[ [ "Aokage", "Kazuya", "" ], [ "Mizukawa", "Hiroshi", "" ], [ "Yamada", "Hiro-Fumi", "" ] ]
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801.2819
Wei-Sheng Lee
W.S. Lee, I. M. Vishik, K. Tanaka, D. H. Lu, T. Sasagawa, N. Nagaosa, T. P. Devereaux, Z. Hussain, and Z. -X. Shen
Abrupt Onset of Second Energy Gap at Superconducting Transition of Underdoped Bi2212
16 pages, 4 figures, authors' version Corrected typos in the abstract
Nature 450, 81 (2007)
10.1038/nature06219
null
cond-mat.supr-con cond-mat.str-el
null
The superconducting gap - an energy scale tied to the superconducting phenomena-opens on the Fermi surface at the superconducting transition temperature (TC) in conventional BCS superconductors. Quite differently, in underdoped high-TC superconducting cuprates, a pseudogap, whose relation to the superconducting gap remains a mystery, develops well above TC. Whether the pseudogap is a distinct phenomenon or the incoherent continuation of the superconducting gap above TC is one of the central questions in high-TC research. While some experimental evidence suggests they are distinct, this issue is still under intense debate. A crucial piece of evidence to firmly establish this two-gap picture is still missing: a direct and unambiguous observation of a single-particle gap tied to the superconducting transition as function of temperature. Here we report the discovery of such an energy gap in underdoped Bi2212 in the momentum space region overlooked in previous measurements. Near the diagonal of Cu-O bond direction (nodal direction), we found a gap which opens at TC and exhibits a canonical (BCS-like) temperature dependence accompanied by the appearance of the so-called Bogoliubov quasiparticles, a classical signature of superconductivity. This is in sharp contrast to the pseudogap near the Cu-O bond direction (antinodal region) measured in earlier experiments. The emerging two-gap phenomenon points to a picture of richer quantum configurations in high temperature superconductors.
[ { "version": "v1", "created": "Fri, 18 Jan 2008 05:30:36 GMT" }, { "version": "v2", "created": "Mon, 21 Jan 2008 08:38:43 GMT" } ]
2008-01-21T00:00:00
[ [ "Lee", "W. S.", "" ], [ "Vishik", "I. M.", "" ], [ "Tanaka", "K.", "" ], [ "Lu", "D. H.", "" ], [ "Sasagawa", "T.", "" ], [ "Nagaosa", "N.", "" ], [ "Devereaux", "T. P.", "" ], [ "Hussain", "Z.", "" ], [ "Shen", "Z. -X.", "" ] ]
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801.282
Sankarasubramanian Kasiviswanathan
K. Sankarasubramanian, H. Hagenaar
Fine Scale Magnetic Fields in and around a Decaying Active Region
Accepted BASI 2007
null
null
null
astro-ph
null
High spatial resolution spectro-polarimetric observation of a decaying spot was observed with the Diffraction Limited Spectro-Polarimeter. The spatial resolution achieved was close to the diffraction limit (0."18) of the Dunn Solar Telescope. The fine scales present inside the decaying active region as well as surrounding areas were studied. Two interesting phenomenon observed are: (i) Canopy like structures are likely to be present in the umbral dots as well as in the light bridges providing evidence for field-free intrusion, (ii) There are opposite polarity loops present outside of the spot and some of them connects to the main spot and the surrounding magnetic features.
[ { "version": "v1", "created": "Fri, 18 Jan 2008 05:32:53 GMT" } ]
2008-01-21T00:00:00
[ [ "Sankarasubramanian", "K.", "" ], [ "Hagenaar", "H.", "" ] ]
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801.2821
Azad Akhter Siddiqui
Asghar Qadir and Azad A. Siddiqui
On Quantum Effects Near a Black Hole Singularity
Perprint of the AS-ICTP
Class.Quant.Grav.7:511-513,1990
10.1088/0264-9381/7/3/025
null
gr-qc
null
It is pointed out that the claim made by Joshi and Joshi [1], has not been rigorously demonstrated by them. A simpler and more correct proof is provided.
[ { "version": "v1", "created": "Fri, 18 Jan 2008 06:48:23 GMT" } ]
2010-04-06T00:00:00
[ [ "Qadir", "Asghar", "" ], [ "Siddiqui", "Azad A.", "" ] ]
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801.2822
Paul-Emile Paradan
Paul-Emile Paradan (I3M), Mich\`ele Vergne (CMLS-EcolePolytechnique, IMJ)
Equivariant Chern characters with generalized coefficients
63 pages
null
null
null
math.DG
null
These notes form the next episode in a series of articles dedicated to a detailed proof of a cohomological index formula for transversally elliptic pseudo-differential operators and applications. The first two chapters are already available as math.DG/0702575 and arXiv:0711.3898. In this episode, we construct the relative equivariant Chern character of a morphism of vector bundles, localized by a one form, and we prove a multiplicativity property of this generalized Chern character
[ { "version": "v1", "created": "Fri, 18 Jan 2008 06:50:55 GMT" } ]
2008-01-21T00:00:00
[ [ "Paradan", "Paul-Emile", "", "I3M" ], [ "Vergne", "Michèle", "", "CMLS-EcolePolytechnique,\n IMJ" ] ]
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801.2823
Jocelyne Troccaz
Jonathan Schers (TIMC), Jocelyne Troccaz (TIMC), Vincent Daanen (TIMC), C\'eline Fouard (TIMC), Christopher Plaskos, Pascal Kilian
3D/4D ultrasound registration of bone
null
Dans IEEE International Ultrasonic Symposium, 2007 - IEEE International Ultrasonic Symposium, 2007, New-York : \'Etats-Unis d'Am\'erique (2007)
10.1109/ULTSYM.2007.634
null
cs.OH physics.med-ph
null
This paper presents a method to reduce the invasiveness of Computer Assisted Orthopaedic Surgery (CAOS) using ultrasound. In this goal, we need to develop a method for 3D/4D ultrasound registration. The premilinary results of this study suggest that the development of a robust and ``realtime'' 3D/4D ultrasound registration is feasible.
[ { "version": "v1", "created": "Fri, 18 Jan 2008 06:55:06 GMT" } ]
2008-01-21T00:00:00
[ [ "Schers", "Jonathan", "", "TIMC" ], [ "Troccaz", "Jocelyne", "", "TIMC" ], [ "Daanen", "Vincent", "", "TIMC" ], [ "Fouard", "Céline", "", "TIMC" ], [ "Plaskos", "Christopher", "" ], [ "Kilian", "Pascal", "" ] ]
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801.2824
Wentao Zhang
Wentao Zhang, Guodong Liu, Jianqiao Meng, Lin Zhao, Haiyun Liu, Xiaoli Dong, Wei Lu, J. S. Wen, Z. J. Xu, G. D. Gu, T. Sasagawa, Guiling Wang, Yong Zhu, Hongbo Zhang, Yong Zhou, Xiaoyang Wang, Zhongxian Zhao, Chuangtian Chen, Zuyan Xu and X. J. Zhou
High Energy Dispersions in Bi2Sr2CaCu2O8 High Temperature Superconductor from Laser-Based Angle-Resolved Photoemission
4 pages, 4 figures
Phys. Rev. Lett. 101, 017002(2008).
10.1103/PhysRevLett.101.017002
null
cond-mat.supr-con
null
Super-high resolution laser-based angle-resolved photoemission (ARPES) measurements have been carried out on the high energy electron dynamics in Bi2Sr2CaCu2O8 (Bi2212) high temperature superconductor. Momentum dependent measurements provide new insights on the nature of high energy kink at 200~400 meV and high energy dispersions. The strong dichotomy between the MDC- and EDC-derived bands is revealed which raises critical issues about its origin and which one represents intrinsic band structure. The MDC-derived high energy features are affected by the high-intensity valence band at higher binding energy and may not be intrinsic.
[ { "version": "v1", "created": "Fri, 18 Jan 2008 06:58:48 GMT" } ]
2009-11-13T00:00:00
[ [ "Zhang", "Wentao", "" ], [ "Liu", "Guodong", "" ], [ "Meng", "Jianqiao", "" ], [ "Zhao", "Lin", "" ], [ "Liu", "Haiyun", "" ], [ "Dong", "Xiaoli", "" ], [ "Lu", "Wei", "" ], [ "Wen", "J. S.", "" ], [ "Xu", "Z. J.", "" ], [ "Gu", "G. D.", "" ], [ "Sasagawa", "T.", "" ], [ "Wang", "Guiling", "" ], [ "Zhu", "Yong", "" ], [ "Zhang", "Hongbo", "" ], [ "Zhou", "Yong", "" ], [ "Wang", "Xiaoyang", "" ], [ "Zhao", "Zhongxian", "" ], [ "Chen", "Chuangtian", "" ], [ "Xu", "Zuyan", "" ], [ "Zhou", "X. J.", "" ] ]
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801.2825
Yasuhiro Tanaka
Yasuhiro Tanaka and Kenji Yonemitsu
Charge Order with Structural Distortion in Organic Conductors: Comparison between \theta-(ET)2RbZn(SCN)4 and \alpha-(ET)2I3
10 pages, 13 figures, to appear in J. Phys. Soc. Jpn. Vol. 77 (2008) No.3
J. Phys. Soc. Jpn. 77 (2008) 034708
10.1143/JPSJ.77.034708
null
cond-mat.str-el
null
Charge ordering with structural distortion in quasi-two-dimensional organic conductors \theta-(ET)2RbZn(SCN)4 (ET=BEDT-TTF) and \alpha-(ET)2I3 is investigated theoretically. By using the Hartree-Fock approximation for an extended Hubbard model which includes both on-site and intersite Coulomb interactions together with Peierls-type electron-lattice couplings, we examine the role of lattice degrees of freedom on charge order. It is found that the experimentally observed, horizontal charge order is stabilized by lattice distortion in both compounds. In particular, the lattice effect is crucial to the realization of the charge order in \theta-(ET)2RbZn(SCN)4, while the peculiar band structure whose symmetry is lower than that of \theta-(ET)2RbZn(SCN)4 in the metallic phase is also an important factor in \alpha-(ET)2I3 together with the lattice distortion. For \alpha-(ET)2I3, we obtain a phase transition from a charge-disproportionated metallic phase to the horizontal charge order with lattice modulations, which is consistent with the latest X-ray experimental result.
[ { "version": "v1", "created": "Fri, 18 Jan 2008 07:29:39 GMT" } ]
2010-02-10T00:00:00
[ [ "Tanaka", "Yasuhiro", "" ], [ "Yonemitsu", "Kenji", "" ] ]
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801.2826
Paolo Bertozzini -
Paolo Bertozzini (1), Roberto Conti (2), Wicharn Lewkeeratiyutkul (3) ((1) Thammasat University, Bangkok, Thailand, (2) University of Newcastle, Australia, (3) Chulalongkorn University, Bangkok, Thailand)
Non-Commutative Geometry, Categories and Quantum Physics
Survey paper, 70 pages, AMS-LaTeX2e, results unchanged, considerably expanded version of the published paper (only for the arXiv repository), bibliography updated to October 2009, significant improvements and expansions in several sections, added appendix with selected recent references
East-West Journal of Mathematics "Contributions in Mathematics and Applications II" Special Volume 2007, 213-259 (2008)
null
null
math.OA gr-qc hep-th math.CT quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
After an introduction to some basic issues in non-commutative geometry (Gel'fand duality, spectral triples), we present a "panoramic view" of the status of our current research program on the use of categorical methods in the setting of A.Connes' non-commutative geometry: morphisms/categories of spectral triples, categorification of Gel'fand duality. We conclude with a summary of the expected applications of "categorical non-commutative geometry" to structural questions in relativistic quantum physics: (hyper)covariance, quantum space-time, (algebraic) quantum gravity.
[ { "version": "v1", "created": "Fri, 18 Jan 2008 07:30:18 GMT" }, { "version": "v2", "created": "Tue, 27 Dec 2011 18:38:32 GMT" } ]
2012-01-06T00:00:00
[ [ "Bertozzini", "Paolo", "" ], [ "Conti", "Roberto", "" ], [ "Lewkeeratiyutkul", "Wicharn", "" ] ]
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801.2827
Yong Chen
Shao-Meng Qin, Yong Chen, Xiao-Ying Zhao, and Jian Shi
Effect of memory on the prisoner's dilemma game in a square lattice
6 papers, 6 figures
Phys. Rev. E 78, 041129 (2008)
10.1103/PhysRevE.78.041129
null
physics.soc-ph physics.comp-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We have studied the effect of memory on evolution of the prisoner's dilemma game using square lattice networks. Based on extensive simulations, we found that the density of cooperators was enhanced by an increasing memory effect for most parameters. However, we also observed that the density of cooperators decreased with an increased memory effect in the case of a large memory and moderate temptation. It is interesting to note that memory makes cooperators immune from temptation. The strength of protection reaches its maximal value only for the moderate memory effect.
[ { "version": "v1", "created": "Fri, 18 Jan 2008 08:04:12 GMT" }, { "version": "v2", "created": "Thu, 30 Oct 2008 00:55:27 GMT" } ]
2008-10-30T00:00:00
[ [ "Qin", "Shao-Meng", "" ], [ "Chen", "Yong", "" ], [ "Zhao", "Xiao-Ying", "" ], [ "Shi", "Jian", "" ] ]
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801.2828
Christian Robenhagen Ravnsh{\o}j
Christian Robenhagen Ravnshoj
Non-Cyclic Subgroups of Jacobians of Genus Two Curves with Complex Multiplication
The paper was presented at AGCT 11, november 2007
null
null
null
math.AG
null
Let E be an elliptic curve defined over a finite field. Balasubramanian and Koblitz have proved that if the l-th roots of unity m_l is not contained in the ground field, then a field extension of the ground field contains m_l if and only if the l-torsion points of E are rational over the same field extension. We generalize this result to Jacobians of genus two curves with complex multiplication. In particular, we show that the Weil- and the Tate-pairing on such a Jacobian are non-degenerate over the same field extension of the ground field.
[ { "version": "v1", "created": "Fri, 18 Jan 2008 08:21:44 GMT" } ]
2008-01-21T00:00:00
[ [ "Ravnshoj", "Christian Robenhagen", "" ] ]
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801.2829
ZhenGang Zhu
Zhen-Gang Zhu, and Gang Su
Magnitude of Magnetic Field Dependence of a Possible Selective Spin Filter in ZnSe/Zn_{1-x}Mn_{x}Se Multilayer Heterostructure
null
Phys. Rev. B 70, 193310 (2004)
10.1103/PhysRevB.70.193310
null
cond-mat.mes-hall
null
Spin-polarized transport through a band-gap-matched ZnSe/Zn_{1-x}Mn_{x} Se/ZnSe/Zn_{1-x}Mn_{x}Se/ZnSe multilayer structure is investigated. The resonant transport is shown to occur at different energies for different spins owing to the split of spin subbands in the paramagnetic layers. It is found that the polarization of current density can be reversed in a certain range of magnetic field, with the peak of polarization moving towards a stronger magnetic field for increasing the width of central ZnSe layer while shifting towards an opposite direction for increasing the width of paramagnetic layer. The reversal is limited in a small-size system. A strong suppression of the spin up component of the current density is present at high magnetic field. It is expected that such a reversal of the polarization could act as a possible mechanism for a selective spin filter device.
[ { "version": "v1", "created": "Fri, 18 Jan 2008 08:27:50 GMT" } ]
2009-11-13T00:00:00
[ [ "Zhu", "Zhen-Gang", "" ], [ "Su", "Gang", "" ] ]
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801.283
Kwokwai Chan
Kwokwai Chan and Naichung Conan Leung
Mirror symmetry for toric Fano manifolds via SYZ transformations
v4: final version, to appear in Adv. Math.; v3: 38 pages, substantially revised and expanded, the role of tropical geometry clarified in the newly added Subsection 2.2
Adv. Math. 223 (2010), no. 3, 797-839
10.1016/j.aim.2009.09.009
null
math.SG math.AG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We construct and apply Strominger-Yau-Zaslow mirror transformations to understand the geometry of the mirror symmetry between toric Fano manifolds and Landau-Ginzburg models.
[ { "version": "v1", "created": "Fri, 18 Jan 2008 08:29:32 GMT" }, { "version": "v2", "created": "Fri, 2 May 2008 05:06:35 GMT" }, { "version": "v3", "created": "Tue, 30 Jun 2009 03:12:11 GMT" }, { "version": "v4", "created": "Thu, 1 Oct 2009 03:05:43 GMT" } ]
2014-02-19T00:00:00
[ [ "Chan", "Kwokwai", "" ], [ "Leung", "Naichung Conan", "" ] ]
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801.2831
Taylor Hughes
Chaoxing Liu, Taylor L. Hughes, Xiao-Liang Qi, Kang Wang, and Shou-Cheng Zhang
Quantum Spin Hall Effect in Inverted Type II Semiconductors
5 pages,4 figures. Submitted to PRL. For high resolution figures see final published version when available
null
10.1103/PhysRevLett.100.236601
null
cond-mat.mes-hall cond-mat.mtrl-sci
null
The quantum spin Hall (QSH) state is a topologically non-trivial state of quantum matter which preserves time-reversal symmetry; it has an energy gap in the bulk, but topologically robust gapless states at the edge. Recently, this novel effect has been predicted and observed in HgTe quantum wells. In this work we predict a similar effect arising in Type-II semiconductor quantum wells made from InAs/GaSb/AlSb. Because of a rare band alignment the quantum well band structure exhibits an "inverted" phase similar to CdTe/HgTe quantum wells, which is a QSH state when the Fermi level lies inside the gap. Due to the asymmetric structure of this quantum well, the effects of inversion symmetry breaking and inter-layer charge transfer are essential. By standard self-consistent calculations, we show that the QSH state persists when these corrections are included, and a quantum phase transition between the normal insulator and the QSH phase can be electrically tuned by the gate voltage.
[ { "version": "v1", "created": "Fri, 18 Jan 2008 16:48:39 GMT" } ]
2009-11-13T00:00:00
[ [ "Liu", "Chaoxing", "" ], [ "Hughes", "Taylor L.", "" ], [ "Qi", "Xiao-Liang", "" ], [ "Wang", "Kang", "" ], [ "Zhang", "Shou-Cheng", "" ] ]
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801.2832
Giuseppe Bimonte
Giuseppe Bimonte
Johnson-Nyquist noise and the Casimir force between real metals at nonzero temperature
9 pages, 1 encapsulated figure. Contributed to 8th Workshop on Quantum Field Theory Under the Influence of External Conditions (QFEXT07), Leipzig, Germany, 17-21 Sep 2007
J.Phys.A41:164013,2008
10.1088/1751-8113/41/16/164013
null
quant-ph hep-th
null
It is well known since a long time that all lossy conductors at finite temperature display an electronic noise, the Johnson-Nyquist noise, arising from the thermal agitation of electric charges inside the conductor. The existence of this noise implies that two nearby discharged conductors at finite temperature should repel each other, as a result of the electrodynamic interaction between the Johnson-Nyquist currents in either conductor and the eddy currents they induce in the other. It is suggested that this force is at the origin of the recently discovered large repulsive correction to the thermal Casimir force between two lossy metallic plates. Further support for this physical picture is obtained by studying a simple system of two linear noisy antennas. Using elementary concepts from circuit theory, we show that the repulsive force engendered by the Johnson-Nyquist noise results in the same kind of thermodynamic inconsistencies found in the Casimir problem. We show that all inconsistencies are however resolved if account is taken of capacitive effects associated with the end points of the antennas. Our findings therefore suggest that capacitive effects resulting from the finite size of the plates, may be essential for a resolution of the analogous problems met in the thermal Casimir effect.
[ { "version": "v1", "created": "Fri, 18 Jan 2008 08:58:17 GMT" } ]
2008-11-26T00:00:00
[ [ "Bimonte", "Giuseppe", "" ] ]
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801.2833
Steffen L\"ock
A. B\"acker, R. Ketzmerick, S. L\"ock, M. Robnik, G. Vidmar, R. H\"ohmann, U. Kuhl, H.-J. St\"ockmann
Dynamical tunneling in mushroom billiards
4 pages, 4 figures
Phys. Rev. Lett. 100, 174103 (2008)
10.1103/PhysRevLett.100.174103
null
nlin.CD
null
We study the fundamental question of dynamical tunneling in generic two-dimensional Hamiltonian systems by considering regular-to-chaotic tunneling rates. Experimentally, we use microwave spectra to investigate a mushroom billiard with adjustable foot height. Numerically, we obtain tunneling rates from high precision eigenvalues using the improved method of particular solutions. Analytically, a prediction is given by extending an approach using a fictitious integrable system to billiards. In contrast to previous approaches for billiards, we find agreement with experimental and numerical data without any free parameter.
[ { "version": "v1", "created": "Fri, 18 Jan 2008 09:16:17 GMT" }, { "version": "v2", "created": "Mon, 5 May 2008 11:03:19 GMT" } ]
2008-05-05T00:00:00
[ [ "Bäcker", "A.", "" ], [ "Ketzmerick", "R.", "" ], [ "Löck", "S.", "" ], [ "Robnik", "M.", "" ], [ "Vidmar", "G.", "" ], [ "Höhmann", "R.", "" ], [ "Kuhl", "U.", "" ], [ "Stöckmann", "H. -J.", "" ] ]
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801.2834
Stefan M\"uller-Stach
S. M\"uller-Stach, E. Viehweg, K. Zuo
Relative Proportionality for subvarieties of moduli spaces of K3 and abelian surfaces
27 pages
null
null
null
math.AG
null
The relative proportionality principle of Hirzebruch and H\"ofer was discovered in the case of compactified ball quotient surfaces X when studying curves C in X. It can be expressed as an inequality which attains equality precisely when C is an induced quotient of a subball. A similar inequality holds for curves on Hilbert modular surfaces. In this paper we prove a generalization of this result to subvarieties of Shimura varieties of orthogonal type, i.e. locally symmetric spaces for the Lie group SO(n,2). Furthermore we study the ''inverse problem'' of deciding when an arbitrary subvariety Z of M is of Hodge type, provided it contains sufficiently many divisors W_i which are of Hodge type and satisfy relative proportionality.
[ { "version": "v1", "created": "Fri, 18 Jan 2008 09:12:13 GMT" } ]
2008-01-21T00:00:00
[ [ "Müller-Stach", "S.", "" ], [ "Viehweg", "E.", "" ], [ "Zuo", "K.", "" ] ]
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801.2835
Christian Robenhagen Ravnsh{\o}j
Christian Robenhagen Ravnshoj
Non-Cyclic Subgroups of Jacobians of Genus Two Curves
null
null
null
null
math.AG
null
Let E be an elliptic curve defined over a finite field. Balasubramanian and Koblitz have proved that if the l-th roots of unity m_l is not contained in the ground field, then a field extension of the ground field contains m_l if and only if the l-torsion points of E are rational over the same field extension. We generalize this result to Jacobians of genus two curves. In particular, we show that the Weil- and the Tate-pairing are non-degenerate over the same field extension of the ground field. From this generalization we get a complete description of the l-torsion subgroups of Jacobians of supersingular genus two curves. In particular, we show that for l>3, the l-torsion points are rational over a field extension of degree at most 24.
[ { "version": "v1", "created": "Fri, 18 Jan 2008 09:12:55 GMT" } ]
2008-01-21T00:00:00
[ [ "Ravnshoj", "Christian Robenhagen", "" ] ]
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801.2836
Gabor Takacs
Z. Bajnok, L. Palla and G. Takacs
Casimir effect in the boundary state formalism
11 pages. Proceedings contribution of talk given at the Workshop on Quantum Field Theory under the Influence of External Conditions (QFEXT07), University of Leipzig, September 16-21, 2007. To appear in J. Phys. A
J.Phys.A41:164011,2008
10.1088/1751-8113/41/16/164011
null
hep-th quant-ph
null
Casimir effect in the planar setting is described using the boundary state formalism, for general partially reflecting boundaries. It is expressed in terms of the low-energy degrees of freedom, which provides a large distance expansion valid for general interacting field theories provided there is a non-vanishing mass gap. The expansion is written in terms of the scattering amplitudes, and needs no ultraviolet renormalization. We also discuss the case when the quantum field has a nontrivial vacuum configuration.
[ { "version": "v1", "created": "Fri, 18 Jan 2008 09:16:36 GMT" } ]
2008-11-26T00:00:00
[ [ "Bajnok", "Z.", "" ], [ "Palla", "L.", "" ], [ "Takacs", "G.", "" ] ]
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801.2837
Marc Joyeux
Sahin Buyukdagli and Marc Joyeux
Statistical physics of the melting of inhomogeneous DNA
null
Physical Review E 77 (2008) 031903
10.1103/PhysRevE.77.031903
null
physics.bio-ph
null
We studied how the inhomogeneity of a sequence affects the phase transition that takes place at DNA melting. Unlike previous works, which considered thermodynamic quantities averaged over many different inhomogeneous sequences, we focused on precise sequences and investigated the succession of local openings that lead to their dissociation. For this purpose, we performed Transfer Integral type calculations with two different dynamical models, namely the heterogeneous Dauxois-Peyrard-Bishop model and the model based on finite stacking enthalpies we recently proposed. It appears that, for both models, the essential effect of heterogeneity is to let different portions of the investigated sequences open at slightly different temperatures. Besides this macroscopic effect, the local aperture of each portion indeed turns out to be very similar to that of a homogeneous sequence with the same length. Rounding of each local opening transition is therefore merely a size effect. For the Dauxois-Peyrard-Bishop model, sequences with a few thousands base pairs are still far from the thermodynamic limit, so that it is inappropriate, for this model, to discuss the order of the transition associated with each local opening. In contrast, sequences with several hundreds to a few thousands base pairs are pretty close to the thermodynamic limit for the model we proposed. The temperature interval where power laws holds is consequently broad enough to enable the estimation of critical exponents. On the basis of the few examples we investigated, it seems that, for our model, disorder does not necessarily induce a decrease of the order of the transition.
[ { "version": "v1", "created": "Fri, 18 Jan 2008 09:20:48 GMT" } ]
2008-03-07T00:00:00
[ [ "Buyukdagli", "Sahin", "" ], [ "Joyeux", "Marc", "" ] ]
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801.2838
Avraham Trahtman N
A.N. Trahtman
An Algorithm for Road Coloring
10 pages
null
null
null
cs.DM
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A coloring of edges of a finite directed graph turns the graph into finite-state automaton. The synchronizing word of a deterministic automaton is a word in the alphabet of colors (considered as letters) of its edges that maps the automaton to a single state. A coloring of edges of a directed graph of uniform outdegree (constant outdegree of any vertex) is synchronizing if the coloring turns the graph into a deterministic finite automaton possessing a synchronizing word. The road coloring problem is the problem of synchronizing coloring of a directed finite strongly connected graph of uniform outdegree if the greatest common divisor of the lengths of all its cycles is one. The problem posed in 1970 had evoked a noticeable interest among the specialists in the theory of graphs, automata, codes, symbolic dynamics as well as among the wide mathematical community. A polynomial time algorithm of $O(n^3)$ complexity in the most worst case and quadratic in majority of studied cases for the road coloring of the considered graph is presented below. The work is based on recent positive solution of the road coloring problem. The algorithm was implemented in the package TESTAS
[ { "version": "v1", "created": "Fri, 18 Jan 2008 09:22:46 GMT" }, { "version": "v2", "created": "Mon, 23 Nov 2009 06:11:35 GMT" }, { "version": "v3", "created": "Tue, 23 Nov 2010 11:06:54 GMT" } ]
2010-11-24T00:00:00
[ [ "Trahtman", "A. N.", "" ] ]
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801.2839
Oscar Diego
O. Diego
Toward the unification of the postulates of Quantum Mechanics
31 pages, no figures
null
null
null
quant-ph hep-th
null
In this paper we are going to introduce a new dynamical postulate in Quantum Mechanics. This new principle is defined using path integrals over the set of normalized wave functions. We will show in a qualitative way that this postulate is equivalent to the Schrodinger equation and to the measurement postulates. Then we propose a new set of fundamental postulates for Quantum Mechanics. In this approach to Quantum Mechanics we separate the fundamental postulates and the physical interpretation. The fundamental postulates are abstract mathematical principles. Their physical interpretation depend on the physical system under study. These postulates do not use the concepts of measurement device and observer.
[ { "version": "v1", "created": "Fri, 18 Jan 2008 09:23:37 GMT" } ]
2008-01-21T00:00:00
[ [ "Diego", "O.", "" ] ]
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801.284
Dr. Georgios M. Nikolopoulos
Georgios M. Nikolopoulos
Applications of single-qubit rotations in quantum public-key cryptography
to appear in Phys. Rev. A
Phys. Rev. A 77, 032348 (2008)
10.1103/PhysRevA.77.032348
null
quant-ph
null
We discuss cryptographic applications of single-qubit rotations from the perspective of trapdoor one-way functions and public-key encryption. In particular, we present an asymmetric cryptosystem whose security relies on fundamental principles of quantum physics. A quantum public key is used for the encryption of messages while decryption is possible by means of a classical private key only. The trapdoor one-way function underlying the proposed cryptosystem maps integer numbers to quantum states of a qubit and its inversion can be infeasible by virtue of the Holevo's theorem.
[ { "version": "v1", "created": "Fri, 18 Jan 2008 09:24:50 GMT" } ]
2008-03-29T00:00:00
[ [ "Nikolopoulos", "Georgios M.", "" ] ]
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801.2841
Yukio Saito
Takeshi Sugimori, Hiroyuki Hyuga, and Yukio Saito
Fluctuation Induced Homochirality
13 pages, 6 figures
null
10.1143/JPSJ.77.064606
null
physics.chem-ph physics.bio-ph
null
We propose a new mechanism for the achievment of homochirality in life without any autocatalytic production process. Our model consists of a spontaneous production together with a recycling cross inhibition in a closed system. It is shown that although the rate equations for this system predict no chiral symmetry breaking, the stochastic master equation predicts complete homochirality. This is because the fluctuation induced by the discreteness of population numbers of participating molecules plays essential roles. This fluctuation conspires with the recyling cross inhibition to realize the homochirality.
[ { "version": "v1", "created": "Fri, 18 Jan 2008 09:25:02 GMT" } ]
2009-11-13T00:00:00
[ [ "Sugimori", "Takeshi", "" ], [ "Hyuga", "Hiroyuki", "" ], [ "Saito", "Yukio", "" ] ]
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801.2842
Yasunari Kurita
Yasunari Kurita, Hideki Ishihara
Thermodynamics of Squashed Kaluza-Klein Black Holes and Black Strings -- A Comparison of Reference Backgrounds --
28 pages; references added, typo corrected;version accepted for publication in Class. Quantum Grav
Class.Quant.Grav.25:085006,2008
10.1088/0264-9381/25/8/085006
OCU-PHYS-289, AP-GR-54
hep-th gr-qc
null
We investigate thermodynamics constructed on different background reference spacetimes for squashed Kaluza-Klein (SqKK) black hole and electrically charged black string in five-dimensional Einstein-Maxwell system. Two spacetimes are possible to be reference spacetimes giving finite gravitational classical actions: one is four-dimensional Minkowski times a circle and the other is the KK monopole. The boundary of the SqKK black hole can not be matched perfectly to that of the former reference spacetime because of the difference in topology. However, the resultant classical action coincides with that calculated by the counterterm subtraction scheme. The boundary of the KK monopole has the same topology with that of the SqKK black hole and can be matched to the boundary of the black hole perfectly. The resultant action takes different value from the result given by using the former reference spacetime. After a brief review of thermodynamic quantities of the black hole solutions, we calculate thermodynamic potentials relevant for several thermodynamic environments. The most stable state is different for each environment: For example, the KK monopole is the most stable state in isothermal environment with fixed gravitational tension. On the other hand, when the size of the extra-dimension is fixed, the Minkowski times a circle is the most stable. It is shown that these two spacetimes can be reference spacetimes of the five-dimensional black string.
[ { "version": "v1", "created": "Fri, 18 Jan 2008 09:26:25 GMT" }, { "version": "v2", "created": "Tue, 4 Mar 2008 04:10:47 GMT" } ]
2008-11-26T00:00:00
[ [ "Kurita", "Yasunari", "" ], [ "Ishihara", "Hideki", "" ] ]
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801.2843
Tzu Chiang Yuan
Chun-Fu Chang, Kingman Cheung and Tzu-Chiang Yuan
Unparticle effects in photon-photon scattering
8 pages, 2 figures
Phys.Lett.B664:291-294,2008
10.1016/j.physletb.2008.05.039
null
hep-ph
null
Elastic photon-photon scattering can only occur via loop diagrams in the standard model and is naturally suppressed. Unparticle can induce tree-level photon-photon scattering through the operator F_{\mu\nu} F^{\mu\nu} O_\U for spin-0 unparticle or F_{\mu\alpha} F^{\alpha}_{\nu} O^{\mu\nu}_\U for spin-2 unparticle. Due to the peculiar CP-conserving phase \exp(-i d_\U \pi) associated with the s-channel unparticle propagator, its interference effects with the t- and u-channels on the total cross section and the angular distribution are found to be some significance. In addition, we show that the cross sections via unparticle exchange can be substantially larger than the standard model contribution.
[ { "version": "v1", "created": "Fri, 18 Jan 2008 09:51:14 GMT" }, { "version": "v2", "created": "Sun, 20 Jan 2008 09:11:51 GMT" } ]
2008-11-26T00:00:00
[ [ "Chang", "Chun-Fu", "" ], [ "Cheung", "Kingman", "" ], [ "Yuan", "Tzu-Chiang", "" ] ]
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801.2844
Carlo Carminati
Carlo Carminati, Stefano Marmi
Linearization of germs: regular dependence on the multiplier
20 pages
null
null
null
math.DS math.NT
null
We prove that the linearization of a germ of holomorphic map of the type $F_\lambda(z)=\lambda(z+O(z^2))$ has a $ C^1$--holomorphic dependence on the multiplier $\lambda$. $C^1$--holomorphic functions are $ C^1$--Whitney smooth functions, defined on compact subsets and which belong to the kernel of the $\bar{\partial}$ operator. The linearization is analytic for $|\lambda|\not= 1$ and the unit circle $S^1$ appears as a natural boundary (because of resonances, i.e. roots of unity). However the linearization is still defined at most points of $S^1$, namely those points which lie ``far enough from resonances'', i.e. when the multiplier satisfies a suitable arithmetical condition. We construct an increasing sequence of compacts which avoid resonances and prove that the linearization belongs to the associated spaces of ${\cal C}^1$--holomorphic functions. This is a special case of Borel's theory of uniform monogenic functions, and the corresponding function space is arcwise-quasianalytic. Among the consequences of these results, we can prove that the linearization admits an asymptotic expansion w.r.t. the multiplier at all points of the unit circle verifying the Brjuno condition: in fact the asymptotic expansion is of Gevrey type at diophantine points.
[ { "version": "v1", "created": "Fri, 18 Jan 2008 10:13:08 GMT" }, { "version": "v2", "created": "Wed, 27 Feb 2008 15:12:34 GMT" } ]
2008-02-27T00:00:00
[ [ "Carminati", "Carlo", "" ], [ "Marmi", "Stefano", "" ] ]
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801.2845
J\'er\'emy Blanc
J\'er\'emy Blanc
The best polynomial bounds for the number of triangles in a simple arrangement of n pseudo-lines
12 pages, 7 figures
null
null
null
math.CO
null
It is well-known that affine (respectively projective) simple arrangements of n pseudo-lines may have at most n(n-2)/3 (respectively n(n-1)/3) triangles. However, these bounds are reached for only some values of n (mod 6). We provide the best polynomial bound for the affine and the projective case, and for each value of n (mod 6).
[ { "version": "v1", "created": "Fri, 18 Jan 2008 09:58:36 GMT" }, { "version": "v2", "created": "Sun, 20 Jan 2008 09:33:04 GMT" } ]
2008-01-21T00:00:00
[ [ "Blanc", "Jérémy", "" ] ]
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801.2846
Marta P\'erez
Marta Perez
Basic deformation theory of smooth formal schemes
14 pages
null
null
null
math.AG
null
We provide the main results of a deformation theory of smooth formal schemes. First we deal with the case of global lifting of smooth morphisms. We prove that the obstruction to the existence of a global lifting lies in a Ext^1 group. Then we study uniqueness and existence of lifting of smooth formal schemes. The set of isomorphism classes of smooth liftings is classified by a Ext^1 group and there exists an obstruction in a Ext^2 group whose vanishing characterizes the existence of smooth liftings.
[ { "version": "v1", "created": "Fri, 18 Jan 2008 10:07:32 GMT" } ]
2008-01-21T00:00:00
[ [ "Perez", "Marta", "" ] ]
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801.2847
Yang-Ho Choi
Y.-H. Choi
A New Approach to Special Relativity and The Universe
null
null
null
null
physics.gen-ph
null
A new approach to special relativity is presented which introduces coordinate systems with imaginary time axes, observation systems, and coordinate bases.
[ { "version": "v1", "created": "Fri, 18 Jan 2008 10:09:54 GMT" }, { "version": "v2", "created": "Sat, 19 Jan 2008 19:43:24 GMT" }, { "version": "v3", "created": "Sat, 17 May 2008 07:15:50 GMT" } ]
2008-05-17T00:00:00
[ [ "Choi", "Y. -H.", "" ] ]
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801.2848
Willard Miller Jr.
Ernest G. Kalnins, Willard Miller Jr, and Sarah Post
Models for Quadratic Algebras Associated with Second Order Superintegrable Systems in 2D
This is a contribution to the Proc. of the Seventh International Conference ''Symmetry in Nonlinear Mathematical Physics'' (June 24-30, 2007, Kyiv, Ukraine), published in SIGMA (Symmetry, Integrability and Geometry: Methods and Applications) at http://www.emis.de/journals/SIGMA/
SIGMA 4 (2008), 008, 21 pages
10.3842/SIGMA.2008.008
null
math-ph math.MP nlin.SI quant-ph
null
There are 13 equivalence classes of 2D second order quantum and classical superintegrable systems with nontrivial potential, each associated with a quadratic algebra of hidden symmetries. We study the finite and infinite irreducible representations of the quantum quadratic algebras though the construction of models in which the symmetries act on spaces of functions of a single complex variable via either differential operators or difference operators. In another paper we have already carried out parts of this analysis for the generic nondegenerate superintegrable system on the complex 2-sphere. Here we carry it out for a degenerate superintegrable system on the 2-sphere. We point out the connection between our results and a position dependent mass Hamiltonian studied by Quesne. We also show how to derive simple models of the classical quadratic algebras for superintegrable systems and then obtain the quantum models from the classical models, even though the classical and quantum quadratic algebras are distinct.
[ { "version": "v1", "created": "Fri, 18 Jan 2008 10:14:24 GMT" } ]
2008-04-25T00:00:00
[ [ "Kalnins", "Ernest G.", "" ], [ "Miller", "Willard", "Jr" ], [ "Post", "Sarah", "" ] ]
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801.2849
Jonathan Keeling
J. Keeling, V. Gurarie
Collapse and revivals of a the photon field in a many-body Landau-Zener process
Some clarifications, added inset to Fig. 2. 4 pages, 3 figures
Phys. Rev. Lett. 101, 033001 (2008)
10.1103/PhysRevLett.101.033001
null
cond-mat.other
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We consider the evolution of a two-level system coupled to a photon field initially in a coherent state, as the energy of the two-level system is linearly varied through resonance with the photon field. At a fixed time after the resonance, the amplitude of the photon field is found to show a collapse and subsequent revivals as a function of rate of energy variation. Including decay of the photon field, we find that the observation of such collapse and revivals is near the technological limit of current cavity QED experiments but should be achievable.
[ { "version": "v1", "created": "Fri, 18 Jan 2008 10:25:13 GMT" }, { "version": "v2", "created": "Fri, 20 Jun 2008 08:42:19 GMT" } ]
2008-07-14T00:00:00
[ [ "Keeling", "J.", "" ], [ "Gurarie", "V.", "" ] ]
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801.285
Claudio Dappiaggi
Claudio Dappiaggi, Klaus Fredenhagen and Nicola Pinamonti
Stable cosmological models driven by a free quantum scalar field
8 pages, 1 figure and revtex. Comments and references added
Phys.Rev.D77:104015,2008
10.1103/PhysRevD.77.104015
Desy 08-006, ZMP-HH/08-1
gr-qc hep-th
null
In the mathematically rigorous analysis of semiclassical Einstein's equations, the renormalisation of the stress-energy tensor plays a crucial role. We address such a topic in the case of a scalar field with both arbitrary mass and coupling with gravity in the hypothesis that the underlying algebraic quantum state is of Hadamard type. Particularly, if we focus on highly symmetric solutions of the semiclassical Einstein's equations, the envisaged method displays a de Sitter type behaviour even without an a priori introduced cosmological constant. As a further novel result we shall show that these solutions turn out to be stable.
[ { "version": "v1", "created": "Fri, 18 Jan 2008 15:24:51 GMT" }, { "version": "v2", "created": "Fri, 1 Feb 2008 16:12:36 GMT" } ]
2008-11-26T00:00:00
[ [ "Dappiaggi", "Claudio", "" ], [ "Fredenhagen", "Klaus", "" ], [ "Pinamonti", "Nicola", "" ] ]
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801.2851
Martin Oettel
H. Lehle, E. Noruzifar and M. Oettel
Ellipsoidal particles at fluid interfaces
10 pages, submitted to EPJE (Special Issue Soft Matter Conference Aachen'07)
Eur. Phys. J. E 26, 151-160 (2008)
10.1140/epje/i2007-10314-1
null
cond-mat.soft
null
For partially wetting, ellipsoidal colloids trapped at a fluid interface, their effective, interface--mediated interactions of capillary and fluctuation--induced type are analyzed. For contact angles different from 90$^o$, static interface deformations arise which lead to anisotropic capillary forces that are substantial already for micrometer--sized particles. The capillary problem is solved using an efficient perturbative treatment which allows a fast determination of the capillary interaction for all distances between and orientations of two particles. Besides static capillary forces, fluctuation--induced forces caused by thermally excited capillary waves arise at fluid interfaces. For the specific choice of a spatially fixed three--phase contact line, the asymptotic behavior of the fluctuation--induced force is determined analytically for both the close--distance and the long--distance regime and compared to numerical solutions.
[ { "version": "v1", "created": "Fri, 18 Jan 2008 10:46:55 GMT" } ]
2008-07-11T00:00:00
[ [ "Lehle", "H.", "" ], [ "Noruzifar", "E.", "" ], [ "Oettel", "M.", "" ] ]
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801.2852
Mihail Mintchev
B. Bellazzini, M. Burrello, M. Mintchev and P. Sorba
Quantum Field Theory on Star Graphs
Talk presented at the Isaac Newton Institute programme Analysis on Graphs and its Applications (Cambridge 2007) -- to be published in Proceedings of Symposia in Pure Mathematics (AMS). LaTex 24+1 pages, 4 figures
Proc.Symp.Pure Math.77:639,2008
null
IFUP-TH 1/2008, LAPTH-Conf-1234/08
hep-th cond-mat.mes-hall math-ph math.MP
null
We discuss some basic aspects of quantum fields on star graphs, focusing on boundary conditions, symmetries and scale invariance in particular. We investigate the four-fermion bulk interaction in detail. Using bosonization and vertex operators, we solve the model exactly for scale invariant boundary conditions, formulated in terms of the fermion current and without dissipation. The critical points are classified and determined explicitly. These results are applied for deriving the charge and spin transport, which have interesting physical features.
[ { "version": "v1", "created": "Fri, 18 Jan 2008 10:52:02 GMT" } ]
2010-12-17T00:00:00
[ [ "Bellazzini", "B.", "" ], [ "Burrello", "M.", "" ], [ "Mintchev", "M.", "" ], [ "Sorba", "P.", "" ] ]
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801.2853
Francois Demontoux
Fran\c{c}ois Demontoux (LPIOM, IMS), Fabrice Bonnaudin (LPIOM, IMS), Jean-Louis Miane (LPIOM)
Mod\'elisation de la propagation dans une structure ferm\'ee surdimensionn\'ee
null
null
null
null
physics.class-ph
null
The propagation of an electromagnetic wave in closed structures led to numerous applications ranging from the characterization of materials in resonating cavities to the measurements using pregnant reverberant EMF. We created models to study the existence of electromagnetic waves in large closed structures. There are two ways of excitation in such structures. One of these methods is based on continuous excitation with specific resonant modes, which has a variety of applications. The second method consists of a pulsed excitation similar to the impulse wave radar. This excitation provides other information. The structures studied were closed by perfectly conducting walls and the electromagnetic wave was generated in the structure using dipole antennas. The dimensions (length, width and height) were always much larger than the wavelength.
[ { "version": "v1", "created": "Fri, 18 Jan 2008 10:53:37 GMT" } ]
2008-08-29T00:00:00
[ [ "Demontoux", "François", "", "LPIOM, IMS" ], [ "Bonnaudin", "Fabrice", "", "LPIOM, IMS" ], [ "Miane", "Jean-Louis", "", "LPIOM" ] ]
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801.2854
Jose Luis Toca-Herrera
V. Tella, J. L. Toca-Herrera, J. E. Gallach, J. Benavent, L. M. Gonzalez, R. Arellano
Effect of fatigue on the intra-cycle acceleration in front crawl swimming: A time-frequency analysis
18 pages, 2 figures, 4 tables
Journal of Biomechanics 41 (2008) 86
null
null
physics.med-ph
null
The present study analyzes the changes in acceleration produced by swimmers before and after fatiguing effort. The subjects (n=15) performed a 25-meter crawl series at maximum speed without fatigue, and a second series with fatigue. The data were registered with a synchronized system that consisted in a position transducer (1 kHz) and a video photogrametry (50Hz). The acceleration (ms-2) was obtained by the derivative analysis of the variation of the position with time. The amplitude in the time domain was calculated with the root mean square (RMS); while the peak power (PP), the peak power frequency (PPF) and the spectrum area (SA) was calculated in the frequency domain with Fourier analysis. On one hand, the results of the temporal domain show that the RMS change percentage between series was 67.5% (p<0.001). On the other hand, PP, PPF, and SA show significant changes (p<0.001). PP and SA were reduced by 63.1% and 59.5%, respectively. Our results show that the acceleration analysis of the swimmer with Fourier analysis permits a more precise understanding of which propulsive forces contribute to the swimmer performance before and after fatigue appears.
[ { "version": "v1", "created": "Fri, 18 Jan 2008 11:14:29 GMT" } ]
2008-01-21T00:00:00
[ [ "Tella", "V.", "" ], [ "Toca-Herrera", "J. L.", "" ], [ "Gallach", "J. E.", "" ], [ "Benavent", "J.", "" ], [ "Gonzalez", "L. M.", "" ], [ "Arellano", "R.", "" ] ]
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801.2855
Attila Szolnoki
Gyorgy Szabo and Attila Szolnoki
Phase transitions induced by variation of invasion rates in spatial cyclic predator-prey models with four or six species
4 pages, 4 figures
Phys. Rev. E 77 (2008) 011906
10.1103/PhysRevE.77.011906
null
q-bio.PE physics.bio-ph
null
Cyclic predator-prey models with four or six species are studied on a square lattice when the invasion rates are varied. It is found that the cyclic invasions maintain a self-organizing pattern as long as the deviation of the invasion rate(s) from a uniform value does not exceed a threshold value. For larger deviations the system exhibits a continuous phase transition into a frozen distribution of odd (or even) label species.
[ { "version": "v1", "created": "Fri, 18 Jan 2008 11:38:05 GMT" } ]
2008-01-21T00:00:00
[ [ "Szabo", "Gyorgy", "" ], [ "Szolnoki", "Attila", "" ] ]
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801.2856
Oliver Schnetz
Oliver Schnetz
Quantum periods: A census of \phi^4-transcendentals
33 pages, 71 postscript figures, v2: augmented and rewritten
Commun.Num.Theor.Phys.4:1-48,2010
null
null
hep-th
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Perturbative quantum field theories frequently feature rational linear combinations of multiple zeta values (periods). In massless \phi^4-theory we show that the periods originate from certain `primitive' vacuum graphs. Graphs with vertex connectivity 3 are reducible in the sense that they lead to products of periods with lower loop order. A new `twist' identity amongst periods is proved and a list of graphs (the census) with their periods, if available, is given up to loop order 8.
[ { "version": "v1", "created": "Fri, 18 Jan 2008 11:40:08 GMT" }, { "version": "v2", "created": "Tue, 27 Oct 2009 13:19:45 GMT" } ]
2014-11-18T00:00:00
[ [ "Schnetz", "Oliver", "" ] ]
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801.2857
Alexander Rudenko
A.N. Rudenko, V.V. Mazurenko, V.I. Anisimov, A.I. Lichtenstein
Weak ferromagnetism in Mn nanochains on the CuN surface
8 pages, 7 figures
Phys. Rev. B 79, 144418 (2009)
10.1103/PhysRevB.79.144418
null
cond-mat.mtrl-sci cond-mat.other
null
We investigate electronic and magnetic structures of the Mn chains supported on the CuN surface using first-principle LSDA and LDA+U calculations. The isotropic exchange integrals and anisotropic Dzyaloshinskii-Moriya interactions between Mn atoms are calculated using Green function formalism. It is shown that the account of lattice relaxation and on-site Coulomb interaction are important for accurate description of magnetic properties of the investigated nanosystems. We predict a weak ferromagnetism phenomenon in the Mn antiferromagnetic nanochains on the CuN surface. The value of a net magnetic moment and direction of spin canting are calculated. We show that some experimental features may be explained using anisotropic exchange interactions.
[ { "version": "v1", "created": "Fri, 18 Jan 2008 11:55:33 GMT" } ]
2010-09-15T00:00:00
[ [ "Rudenko", "A. N.", "" ], [ "Mazurenko", "V. V.", "" ], [ "Anisimov", "V. I.", "" ], [ "Lichtenstein", "A. I.", "" ] ]
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801.2858
Fabrizio Altarelli
Fabrizio Altarelli
Theoretical analysis of optimization problems - Some properties of random k-SAT and k-XORSAT
Ph.D. thesis, 132 pages
null
null
null
cond-mat.stat-mech cond-mat.dis-nn cs.CC
null
This thesis is divided in two parts. The first presents an overview of known results in statistical mechanics of disordered systems and its approach to random combinatorial optimization problems. The second part is a discussion of two original results. The first result concerns DPLL heuristics for random k-XORSAT, which is equivalent to the diluted Ising p-spin model. It is well known that DPLL is unable to find the ground states in the clustered phase of the problem, i.e. that it leads to contradictions with probability 1. However, no solid argument supports this is general. A class of heuristics, which includes the well known UC and GUC, is introduced and studied. It is shown that any heuristic in this class must fail if the clause to variable ratio is larger than some constant, which depends on the heuristic but is always smaller than the clustering threshold. The second result concerns the properties of random k-SAT at large clause to variable ratios. In this regime, it is well known that the uniform distribution of random instances is dominated by unsatisfiable instances. A general technique (based on the Replica method) to restrict the distribution to satisfiable instances with uniform weight is introduced, and is used to characterize their solutions. It is found that in the limit of large clause to variable ratios, the uniform distribution of satisfiable random k-SAT formulas is asymptotically equal to the much studied Planted distribution. Both results are already published and available as arXiv:0709.0367 and arXiv:cs/0609101 . A more detailed and self-contained derivation is presented here.
[ { "version": "v1", "created": "Fri, 18 Jan 2008 11:50:32 GMT" } ]
2008-01-21T00:00:00
[ [ "Altarelli", "Fabrizio", "" ] ]
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801.2859
Petar Grujic Mr
V. Pankovic, S. Ciganovic, J. Ivanovic, R. Glavatovic, P. Grujic
A Simple Holographic Model of the Cosmological Constant
no figures
null
null
null
astro-ph
null
We examine a simple theoretical model to estimate (by fine tuning condition) the value of the cosmological constant. We assume, in analogy with holographic principle, that cosmological constant, like classical surface tension coefficient in a liquid drop, does not correspond to a volume (bulk) vacuum mass (energy) density distribution, but rather to the surface vacuum mass (energy) density distribution. Then the form of given surface mass distribution and fine tuning condition imply observed growing (for about 61 order of magnitude) of the scale factor, from the initial (corresponding to Planck length), to the recent, at the beginning of the cosmic acceleration (corresponding to 10 Glyr length).
[ { "version": "v1", "created": "Fri, 18 Jan 2008 11:58:35 GMT" } ]
2008-01-21T00:00:00
[ [ "Pankovic", "V.", "" ], [ "Ciganovic", "S.", "" ], [ "Ivanovic", "J.", "" ], [ "Glavatovic", "R.", "" ], [ "Grujic", "P.", "" ] ]
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801.286
Mosseri
Remy Mosseri
Geometrical approach to SU(2) navigation with Fibonacci anyons
12 pages, 5 figures
null
10.1088/1751-8113/41/17/175302
null
quant-ph cond-mat.other math.GT
null
Topological quantum computation with Fibonacci anyons relies on the possibility of efficiently generating unitary transformations upon pseudoparticles braiding. The crucial fact that such set of braids has a dense image in the unitary operations space is well known; in addition, the Solovay-Kitaev algorithm allows to approach a given unitary operation to any desired accuracy. In this paper, the latter task is fulfilled with an alternative method, in the SU(2) case, based on a generalization of the geodesic dome construction to higher dimension.
[ { "version": "v1", "created": "Fri, 18 Jan 2008 11:58:35 GMT" } ]
2009-11-13T00:00:00
[ [ "Mosseri", "Remy", "" ] ]
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801.2861
Kohta Murase
Kohta Murase, Kunihito Ioka, Shigehiro Nagataki, Takashi Nakamura
High-energy cosmic-ray nuclei from high- and low-luminosity gamma-ray bursts and implications for multi-messenger astronomy
21 pages, 11 figures, accepted for publication in PRD. Two figures added. Conclusions unchanged
Phys.Rev.D 78 (2008) 023005
10.1103/PhysRevD.78.023005
YITP-08-104, KEK-TH-1228, KEK-Cosmo-8
astro-ph
null
Gamma-ray bursts (GRBs) are one of the candidates of ultra-high-energy (around 10^18.5 eV) cosmic-ray (UHECR) sources. We investigate high-energy cosmic-ray acceleration including heavy nuclei in GRBs by using Geant 4, and discuss its various implications, taking both of high-luminosity (HL) and low-luminosity (LL) GRBs into account. This is because LL GRBs may also make a significant contribution to the observed UHECR flux if they form a distinct population. We show that not only protons but also heavier nuclei can be accelerated up to ultra-high energies in the internal, (external) reverse and forward shock models. We also show that the condition for ultra-high-energy heavy nuclei such as iron to survive is almost the same as that for about TeV gamma-rays to escape from the source and for high-energy neutrinos not to be much produced. The multi-messenger astronomy by neutrino and GeV-TeV gamma-ray telescopes such as IceCube and KM3Net, GLAST and MAGIC will be important to see whether GRBs can be accelerators of ultra-high-energy heavy nuclei. We also demonstrate expected spectra of high-energy neutrinos and gamma rays, and discuss their detectabilities. In addition, we discuss implictaions of the GRB-UHECR hypothesis. We point out, since the number densities of HL-GRBs and LL-GRBs are quite different, its detemination by UHECR observations is also important.
[ { "version": "v1", "created": "Fri, 18 Jan 2008 13:01:33 GMT" }, { "version": "v2", "created": "Tue, 27 May 2008 13:42:20 GMT" } ]
2015-04-23T00:00:00
[ [ "Murase", "Kohta", "" ], [ "Ioka", "Kunihito", "" ], [ "Nagataki", "Shigehiro", "" ], [ "Nakamura", "Takashi", "" ] ]
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801.2862
Chengming Bai
Xiaoli Kong, Chengming Bai
Left-symmetric Superalgebra Structures on the Super-Virasoro Algebras
13 pages, To appear in Pacific Journal of Mathematics
Pacific Journal of Mathematics 235 (2008) 43-55
null
null
math.QA math-ph math.MP
null
In this paper, we classify the compatible left-symmetric superalgebra structures on the super-Virasoro algebras satisfying certain natural conditions.
[ { "version": "v1", "created": "Fri, 18 Jan 2008 12:02:37 GMT" } ]
2008-02-22T00:00:00
[ [ "Kong", "Xiaoli", "" ], [ "Bai", "Chengming", "" ] ]
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801.2863
Tomoyoshi Hirata
Tomoyoshi Hirata
New inequality for Wilson loops from AdS/CFT
16 pages (removed unnecessary figures)
JHEP 0803:018,2008
10.1088/1126-6708/2008/03/018
KUNS-2120
hep-th
null
The strong subadditivity is the most important inequality which entanglement entropy satisfies. Based on the AdS/CFT conjecture, entanglement entropy in CFT is equal to the area of the minimal surface in AdS space. It is known that a Wilson loop can also be holographically computed from the minimal surface in AdS space. In this paper, we argue that Wilson loops also satisfy a similar inequality, and find several evidences of it.
[ { "version": "v1", "created": "Fri, 18 Jan 2008 12:03:11 GMT" }, { "version": "v2", "created": "Mon, 21 Jan 2008 07:56:44 GMT" } ]
2014-11-18T00:00:00
[ [ "Hirata", "Tomoyoshi", "" ] ]
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801.2864
Lister Staveley-Smith
Lister Staveley-Smith
Future ASKAP Studies of the Local Volume
4 pages, 2 figures. To appear in 'Galaxies in the Local Volume' (Sydney, July 2007), eds. B. Koribalski & H. Jerjen, Astrophys. & Space Science
null
10.1007/978-1-4020-6933-8_16
null
astro-ph
null
The Australian SKA Pathfinder (ASKAP) will be a powerful instrument for performing large-scale surveys of galaxies. Its frequency range and large field of view makes it especially useful for an all-sky survey of Local Volume galaxies, and will probably increase the number of known galaxies closer than 10 Mpc by a factor of two and increase, by at least an order of magnitude, the number detected in HI. Implications for our knowledge of the HI mass function for the very faintest galaxies and for the structure and dynamics of the Local Volume are discussed.
[ { "version": "v1", "created": "Fri, 18 Jan 2008 12:06:37 GMT" } ]
2015-05-13T00:00:00
[ [ "Staveley-Smith", "Lister", "" ] ]
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801.2865
Dario Alf\`e
M. Pozzo and D. Alf\`e
Structural properties and enthalpy of formation of magnesium hydride from quantum Monte Carlo calculations
11 pages, 7 figures, to appear in Physical Review B
null
10.1103/PhysRevB.77.104103
null
cond-mat.mtrl-sci
null
We have used diffusion Monte Carlo (DMC) calculations to study the structural properties of magnesium hydride (MgH$_2$), including the pressure-volume equation of state, the cohesive energy and the enthalpy of formation from magnesium bulk and hydrogen gas. The calculations employ pseudopotentials and B-spline basis sets to expand the single particle orbitals used to construct the trial wavefunctions. Extensive tests on system size, time step, and other sources of errors, performed on periodically repeated systems of up to 1050 atoms, show that all these errors together can be reduced to below 10 meV per formula unit. We find excellent agreement with the experiments for the equilibrium volume of both the Mg and the MgH$_2$ crystals. The cohesive energy of the Mg crystal is found to be 1.51(1) eV, and agrees perfectly with the experimental value of 1.51 eV. The enthalpy of formation of MgH$_2$ from Mg bulk and H$_2$ gas is found to be $0.85 \pm 0.01$ eV/formula unit, or $82 \pm 1$ kJ/mole, which is off the experimental one of $76.1 \pm 1$ kJ/mole only by 6 kJ/mole. This shows that DMC can almost achieve chemical accuracy (1 kcal/mole) on this system. Density functional theory errors are shown to be much larger, and depend strongly on the functional employed.
[ { "version": "v1", "created": "Fri, 18 Jan 2008 12:09:23 GMT" }, { "version": "v2", "created": "Tue, 22 Jan 2008 10:45:18 GMT" } ]
2009-11-13T00:00:00
[ [ "Pozzo", "M.", "" ], [ "Alfè", "D.", "" ] ]
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801.2866
Oliver Roth
Daniela Kraus and Oliver Roth
The behaviour of solutions of the Gaussian curvature equation near an isolated boundary point
null
Math. Proc. Cambridge Phil. Soc. 145, 643-667, 2008
10.1017/S0305004108001618
null
math.AP math.CV
null
A classical result of Nitsche \cite{Nit57} about the behaviour of the solutions to the Liouville equation $\Delta u=4 e^{2u}$ near isolated singularities is generalized to solutions of the Gaussian curvature equation $\Delta u=- \kappa(z) e^{2u}$ where $\kappa$ is a negative H\"older continuous function. As an application a higher--order version of the Yau--Ahlfors--Schwarz lemma for complete conformal Riemannian metrics is obtained.
[ { "version": "v1", "created": "Fri, 18 Jan 2008 12:12:43 GMT" } ]
2009-11-13T00:00:00
[ [ "Kraus", "Daniela", "" ], [ "Roth", "Oliver", "" ] ]
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801.2867
Leticia Carigi
Leticia Carigi, Manuel Peimbert
The Helium and Heavy Elements Enrichment of the Galactic Disk
to be published in the RevMexAA in October 2008
null
null
null
astro-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We present chemical evolution models for the Galactic disk. We also present a new determination of X, Y, and Z for M17 a Galactic metal-rich Hii region. We compare our models for the Galactic disk with the Galactic Hii regions abundances. The $\Delta Y/\Delta O$ ratio predicted from the galactic chemical evolution model is in very good agreement with the $\Delta Y/\Delta O$ value derived from M17 and the primordial helium abundance, Yp, taking into account the presence of temperature variations in this Hii region. From the M17 observations we obtain that $\Delta Y/\Delta Z = 1.97 \pm 0.41$, in excellent agreement with two $\Delta Y/\Delta Z$ determinations derived from K dwarf stars of the solar vicinity that amount to $2.1 \pm 0.4$ and $2.1 \pm 0.9$ respectively. We also compare our models with the solar abundances. The solar and Orion nebula O/H values are in good agreement with our chemical evolution model.
[ { "version": "v1", "created": "Fri, 18 Jan 2008 12:14:21 GMT" }, { "version": "v2", "created": "Tue, 24 Jun 2008 13:41:51 GMT" }, { "version": "v3", "created": "Fri, 1 Aug 2008 17:21:52 GMT" } ]
2008-08-01T00:00:00
[ [ "Carigi", "Leticia", "" ], [ "Peimbert", "Manuel", "" ] ]
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801.2868
Natalya Tsirova
A.F. Krutov, V.E. Troitsky, N.A. Tsirova
Asymptotics of the deuteron form factors in the nucleon model and JLab experiments
9 pages, 1 figure
Phys.Rev.C78:044002,2008
10.1103/PhysRevC.78.044002
null
nucl-th
null
Using the instant form dynamics of Poincar\'e invariant quantum mechanics and the modified relativistic impulse approximation proposed previously we calculate asymptotics of electromagnetic form factors for the deuteron considered as two--nucleon system. We show that today experiment on the elastic $ed$-scattering has reached asymptotic regime. The possible range of momentum transfer when the quark degrees of freedom could be seen in future JLab experiments is estimated. The explicit relation between the behavior of deuteron wave function at $r=0$ and the form factors asymptotics is obtained. The conditions on wave functions to give the asymptotics predicted by QCD and quark counting rules are formulated.
[ { "version": "v1", "created": "Fri, 18 Jan 2008 12:18:45 GMT" } ]
2009-01-14T00:00:00
[ [ "Krutov", "A. F.", "" ], [ "Troitsky", "V. E.", "" ], [ "Tsirova", "N. A.", "" ] ]
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801.2869
Pietro-Luciano Buono
Pietro-Luciano Buono and Victor G. LeBlanc
Realization of critical eigenvalues for scalar and symmetric linear delay-differential equations
null
null
10.1137/08071363X
null
math.DS
null
This paper studies the link between the number of critical eigenvalues and the number of delays in certain classes of delay-differential equations. There are two main results. The first states that for k purely imaginary numbers which are linearly independent over the rationals, there exists a scalar delay-differential equation depending on k fixed delays whose spectrum contains those k purely imaginary numbers. The second result is a generalization of the first result for delay-differential equations which admit a characteristic equation consisting of a product of s factors of scalar type. In the second result, the k eigenvalues can be distributed amongst the different factors. Since the characteristic equation of scalar equations contain only exponential terms, the proof exploits a toroidal structure which comes from the arguments of the exponential terms in the characteristic equation. Our second result is applied to delay coupled D_n-symmetric cell systems with one-dimensional cells. In particular, we provide a general characterization of delay coupled D_n-symmetric systems with arbitrary number of delays and cell dimension.
[ { "version": "v1", "created": "Fri, 18 Jan 2008 12:23:14 GMT" } ]
2009-11-13T00:00:00
[ [ "Buono", "Pietro-Luciano", "" ], [ "LeBlanc", "Victor G.", "" ] ]
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801.287
Lister Staveley-Smith
Lister Staveley-Smith
Evolution of Gas in Galaxies
5 pages, 2 figures. To appear in 'From Planets to Dark Energy: the Modern Radio Universe' (Manchester, October 2007), eds. R. Beswick et al., Proceedings of Science
PoS MRU:029,2007
null
null
astro-ph
null
The SKA will be a unique instrument with which to study the evolution of the gas content of galaxies. A proposed deep (~8 Msec) 'pencil-beam' survey is simulated using recently updated specifications for SKA sensitivity and survey speed. Almost 10^7 galaxies could be detected in the redshifted 21cm line, most at redshifts in excess of two. This will enable confident statements to be made about the evolution of the cosmic HI density and the HI mass function to z=3, corresponding to a lookback time of 11 Gyr. However, galaxies or groups of galaxies with masses the same as the most HI-massive galaxies at z=0 will be detectable at redshifts of 6, if they exist. The ideal instrument for studying HI evolution would have an instantaneous sensitivity at least a factor of two higher than current specifications in the critical frequency range 200-500 MHz, or A/T > 2x10^4 m^2/K. The capabilities of the SKA will be highly complementary to ALMA which will be able to study the evolution of the molecular gas component over the same redshift range.
[ { "version": "v1", "created": "Fri, 18 Jan 2008 12:24:24 GMT" } ]
2009-06-23T00:00:00
[ [ "Staveley-Smith", "Lister", "" ] ]
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801.2871
Pelaez
C. Hanhart, J. R. Pelaez and G.Rios
Quark mass dependence of the rho and sigma from dispersion relations and Chiral Perturbation Theory
Final version to appear in Phys. Rev. Lett. References added and typos corrected. 4 pages, three figures
Phys.Rev.Lett.100:152001,2008
10.1103/PhysRevLett.100.152001
FZJ-IKP-TH-2008-01
hep-ph hep-lat
null
We use the one-loop Chiral Perturbation Theory pion-pion scattering amplitude and dispersion theory in the form of the inverse amplitude method, to study the quark mass dependence of the two lightest resonances of the strong interactions, the f_0(600) (sigma) and the rho-meson. As main results we find that the rho-pion-pion coupling constant is almost quark mass independent and that the rho mass shows a smooth quark mass dependence while that of the sigma shows a strong non-analyticity. These findings are important for studies of the meson spectrum on the lattice.
[ { "version": "v1", "created": "Fri, 18 Jan 2008 12:27:01 GMT" }, { "version": "v2", "created": "Thu, 17 Apr 2008 16:42:08 GMT" } ]
2008-11-26T00:00:00
[ [ "Hanhart", "C.", "" ], [ "Pelaez", "J. R.", "" ], [ "Rios", "G.", "" ] ]
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801.2872
Gregory Bewley
Gregory P. Bewley, Matthew S. Paoletti, Katepalli R. Sreenivasan, and Daniel P. Lathrop
Characterization of reconnecting vortices in superfluid helium
null
Proceedings of the National Academy of Sciences, vol. 105, 13707-13710, (2008).
10.1073/pnas.0806002105
null
cond-mat.other cond-mat.supr-con
null
When two vortices cross, each of them breaks into two parts and exchanges part of itself for part of the other. This process, called vortex reconnection, occurs in classical as well as superfluids, and in magnetized plasmas and superconductors. We present the first experimental observations of reconnection between quantized vortices in superfluid helium. We do so by imaging micron-sized solid hydrogen particles trapped on quantized vortex cores (Bewley GP, Lathrop DP, Sreenivasan KR, 2006, Nature, 441:588), and by inferring the occurrence of reconnection from the motions of groups of recoiling particles. We show the distance separating particles on the just-reconnected vortex lines grows as a power law in time. The average value of the scaling exponent is approximately 1/2, consistent with the scale-invariant evolution of the vortices.
[ { "version": "v1", "created": "Fri, 18 Jan 2008 12:28:40 GMT" } ]
2009-11-13T00:00:00
[ [ "Bewley", "Gregory P.", "" ], [ "Paoletti", "Matthew S.", "" ], [ "Sreenivasan", "Katepalli R.", "" ], [ "Lathrop", "Daniel P.", "" ] ]
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