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801.2473
Lorenzo Campos Venuti
L. Campos Venuti, M. Cozzini, P. Buonsante, F. Massel, N. Bray-Ali and P. Zanardi
The fidelity approach to the Hubbard model
8 pages, 4 figures, added results on the hyper-scaling form of the fidelity metric
Phys. Rev. B 78, 115410 (2008)
10.1103/PhysRevB.78.115410
null
cond-mat.stat-mech cond-mat.other quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We use the fidelity approach to quantum critical points to study the zero temperature phase diagram of the one-dimensional Hubbard model. Using a variety of analytical and numerical techniques, we analyze the fidelity metric in various regions of the phase diagram, with particular care to the critical points. Specifically we show that close to the Mott transition, taking place at on-site repulsion U=0 and electron density n=1, the fidelity metric satisfies an hyper-scaling form which we calculate. This implies that in general, as one approaches the critical point U=0, n=1, the fidelity metric tends to a limit which depends on the path of approach. At half filling, the fidelity metric is expected to diverge as U^{-4} when U is sent to zero.
[ { "version": "v1", "created": "Wed, 16 Jan 2008 11:53:35 GMT" }, { "version": "v2", "created": "Fri, 20 Jun 2008 14:43:12 GMT" } ]
2009-11-13T00:00:00
[ [ "Venuti", "L. Campos", "" ], [ "Cozzini", "M.", "" ], [ "Buonsante", "P.", "" ], [ "Massel", "F.", "" ], [ "Bray-Ali", "N.", "" ], [ "Zanardi", "P.", "" ] ]
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801.2474
Adil Mughal
A. Mughal and D. Weaire
Curvature in conformal mappings of 2D lattices and foam structure
19 pages, to be submitted for a special issue of Philosophical Magazine in memory of M A Fortes
Proc. R. Soc. A, 465, 219-238, 2009
10.1098/rspa.2008.0260
null
cond-mat.soft
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The elegant properties of conformal mappings, when applied to two dimensional (2D) lattices, find interesting applications in 2D foams and other cellular or close packed structures. In particular the 2D honeycomb (whose dual is the triangular lattice) may be transformed into various conformal patterns, which compare approximately to experimentally realisable 2D foams. We review and extend the mathematical analysis of such transformations, with several illustrative examples, and an account is given of the related work in energy minimisation problems. New results are adduced for the local curvature generated by the transformation.
[ { "version": "v1", "created": "Wed, 16 Jan 2008 16:44:09 GMT" }, { "version": "v2", "created": "Tue, 12 Apr 2011 12:52:42 GMT" } ]
2011-04-13T00:00:00
[ [ "Mughal", "A.", "" ], [ "Weaire", "D.", "" ] ]
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801.2475
Yuko Nishio
Y. Nishio, K. Inami, T. Ohshima, et al (for the Belle Collaboration)
Search for lepton-flavor-violating $\tau\to\ell V^0$ decays at Belle
7 pages, 16 figures
Phys.Lett.B664:35-40,2008
10.1016/j.physletb.2008.05.012
Belle Preprint 2008-2, KEK Preprint 2007-71
hep-ex
null
We have searched for neutrinoless $\tau$ lepton decays into $\ell$ and $V^0$, where $\ell$ stands for an electron or muon, and $V^0$ for a vector meson ($\phi$, $\omega$, $K^{*0}$, $\bar{K}^{*0}$ or $\rho^0$), using 543 fb$^{-1}$ of data collected with the Belle detector at the KEKB asymmetric-energy $e^+e^-$ collider. No excess of signal events over the expected background has been observed, and we set upper limits on the branching fractions in the range $(5.9-18) \times 10^{-8}$ at the 90% confidence level. These upper limits include the first results for the $\ell \omega$ mode as well as new limits that are significantly more restrictive than our previous results for the $\ell \phi$, $\ell K^{*0}$, $\ell \bar{K}^{*0}$ and $\ell \rho^0$ modes.
[ { "version": "v1", "created": "Wed, 16 Jan 2008 11:43:23 GMT" } ]
2019-08-13T00:00:00
[ [ "Nishio", "Y.", "" ], [ "Inami", "K.", "" ], [ "Ohshima", "T.", "" ] ]
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801.2476
Brad Gibson
Mustapha Mouchine, Brad K. Gibson, Agostino Renda, Daisuke Kawata
Simulating the Mass-Metallicity Relation from z=1
A&A, in press, 13 pages, 10 figures
null
10.1051/0004-6361:20078190
null
astro-ph
null
We use 112 N-body/hydrodynamical simulations in the standard Cold Dark Matter universe, to follow the formation of galaxy-sized halos and investigate the chemical enrichment of both the stellar component and the interstellar medium of galaxies, with stellar masses larger than 1e9 Msun. The resulting chemical properties of the simulated galaxies are broadly consistent with the observations. The predicted relationship between the mean metallicity and the galaxy stellar mass for both the stellar and the gaseous components at z=0 are in agreement with the relationships observed locally. The predicted scatter about these relationships, which is traced to the differing merging histories amongst the simulated galaxies with similar final masses, is similar to that observed. The predicted correlations between the total mass and the stellar mass of galaxies in our simulated sample from the present epoch up to z=1 agree with observed ones. The stellar mass versus metallicity relation and its associated scatter are reproduced by the simulations as consequences of the increasing efficiency of the conversion of gas into stars with stellar mass, and the differing merging histories amongst the galaxies with similar masses. The old ages of simulated low mass galaxies at z=0, and the weak level of chemical evolution for massive galaxies suggest however that our modeling of the supernova feedback may be incomplete, or that other feedback processes have been neglected. (Abridged)
[ { "version": "v1", "created": "Wed, 16 Jan 2008 11:48:38 GMT" } ]
2015-05-13T00:00:00
[ [ "Mouchine", "Mustapha", "" ], [ "Gibson", "Brad K.", "" ], [ "Renda", "Agostino", "" ], [ "Kawata", "Daisuke", "" ] ]
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801.2477
Jesus Araujo
Jesus Araujo (Universidad de Cantabria) and Juan J. Font (Universitat Jaume I)
Stability and instability of weighted composition operators
37 pages, 7 figures. A beamer presentation at http://www.araujo.tk
null
null
null
math.FA
null
Let $\epsilon >0$. A continuous linear operator $T:C(X) \ra C(Y)$ is said to be {\em $\epsilon$-disjointness preserving} if $\vc (Tf)(Tg)\vd_{\infty} \le \epsilon$, whenever $f,g\in C(X)$ satisfy $\vc f\vd_{\infty} =\vc g\vd_{\infty} =1$ and $fg\equiv 0$. In this paper we address basically two main questions: 1.- How close there must be a weighted composition operator to a given $\epsilon$-disjointness preserving operator? 2.- How far can the set of weighted composition operators be from a given $\epsilon$-disjointness preserving operator? We address these two questions distinguishing among three cases: $X$ infinite, $X$ finite, and $Y$ a singleton ($\epsilon$-disjointness preserving functionals). We provide sharp stability and instability bounds for the three cases.
[ { "version": "v1", "created": "Wed, 16 Jan 2008 16:40:31 GMT" } ]
2008-01-17T00:00:00
[ [ "Araujo", "Jesus", "", "Universidad de Cantabria" ], [ "Font", "Juan J.", "", "Universitat\n Jaume I" ] ]
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801.2478
Michael R\"ockner
Viorel Barbu (Institute of Mathematics "Octav Mayer", Iasi, Romania), Giuseppe Da Prato (Scuola Normale Superiore di Pisa, Italy) and Michael R\"ockner (Faculty of Mathematics, Bielefeld, Germany and Departments of Mathematics and Statistics, Purdue University, USA)
Stochastic Porous Media Equation and Self-Organized Criticality
29 pages, BiBoS-Preprint No. 07-11-268
Ann. Probab. 37 (2009), no. 2, 428-452
10.1007/s00220-008-0651-x
null
math.PR math-ph math.AP math.MP
null
The existence and uniqueness of nonnegative strong solutions for stochastic porous media equations with noncoercive monotone diffusivity function and Wiener forcing term is proven. The finite time extinction of solutions with high probability is also proven in 1-D. The results are relevant for self-organized critical behaviour of stochastic nonlinear diffusion equations with critical states.
[ { "version": "v1", "created": "Wed, 16 Jan 2008 12:02:24 GMT" } ]
2018-06-18T00:00:00
[ [ "Barbu", "Viorel", "", "Institute of Mathematics \"Octav Mayer\", Iasi, Romania" ], [ "Da Prato", "Giuseppe", "", "Scuola Normale Superiore di Pisa, Italy" ], [ "Röckner", "Michael", "", "Faculty of Mathematics, Bielefeld, Germany and Departments of\n Mathematics and Statistics, Purdue University, USA" ] ]
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801.2479
Martin Sandberg
M. Sandberg (1), C. M. Wilson (1), F. Persson (1), G. Johansson (1), V. Shumeiko (1), T. Duty (2), P. Delsing (1) ((1) Chalmers University of Technology, Gothenburg, Sweden, (2)The University of Queensland, Australia.)
In-situ frequency tuning of photons stored in a high Q microwave cavity
5 pages, 4 figures
Applied Physics Letters 92(20) 2008
null
null
cond-mat.supr-con
null
Photons are fundamental excitations of the electromagnetic field and can be captured in cavities. For a given cavity with a certain size, the fundamental mode has a fixed frequency f which gives the photons a specific "colour". The cavity also has a typical lifetime tau, which results in a finite linewidth delta f}. If the size of the cavity is changed fast compared to tau, and so that the frequency change Delta f >> delta f, then it is possible to change the "colour" of the captured photons. Here we demonstrate superconducting microwave cavities, with tunable effective lengths. The tuning is obtained by varying a Josephson inductance at one end of the cavity. We show tuning by several hundred linewidths in a time Delta t << tau. Working in the few photon limit, we show that photons stored in the cavity at one frequency will leak out from the cavity with the new frequency after the detuning. The characteristics of the measured devices make them suitable for dynamic coupling of qubits.
[ { "version": "v1", "created": "Wed, 16 Jan 2008 13:29:31 GMT" } ]
2009-03-31T00:00:00
[ [ "Sandberg", "M.", "" ], [ "Wilson", "C. M.", "" ], [ "Persson", "F.", "" ], [ "Johansson", "G.", "" ], [ "Shumeiko", "V.", "" ], [ "Duty", "T.", "" ], [ "Delsing", "P.", "" ] ]
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801.248
Gesualdo Scutari
Gesualdo Scutari, Daniel P. Palomar, and Sergio Barbarossa
Asynchronous Iterative Waterfilling for Gaussian Frequency-Selective Interference Channels
Submitted to IEEE Transactions on Information Theory, August 22, 2006. Revised September 25, 2007. Accepted January 14, 2008. To appear on IEEE Transactions on Information Theory, 2008
null
null
null
cs.IT cs.GT math.IT
null
This paper considers the maximization of information rates for the Gaussian frequency-selective interference channel, subject to power and spectral mask constraints on each link. To derive decentralized solutions that do not require any cooperation among the users, the optimization problem is formulated as a static noncooperative game of complete information. To achieve the so-called Nash equilibria of the game, we propose a new distributed algorithm called asynchronous iterative waterfilling algorithm. In this algorithm, the users update their power spectral density in a completely distributed and asynchronous way: some users may update their power allocation more frequently than others and they may even use outdated measurements of the received interference. The proposed algorithm represents a unified framework that encompasses and generalizes all known iterative waterfilling algorithms, e.g., sequential and simultaneous versions. The main result of the paper consists of a unified set of conditions that guarantee the global converge of the proposed algorithm to the (unique) Nash equilibrium of the game.
[ { "version": "v1", "created": "Wed, 16 Jan 2008 12:36:50 GMT" } ]
2008-01-17T00:00:00
[ [ "Scutari", "Gesualdo", "" ], [ "Palomar", "Daniel P.", "" ], [ "Barbarossa", "Sergio", "" ] ]
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801.2481
Alberto Elduque
Alberto Elduque and Susumu Okubo
Lie algebras with S3 or S4-action, and generalized Malcev algebras
35 pages
null
null
null
math.RA
null
Lie algebras endowed with an action by automorphisms of any of the symmetric groups S3 or S4 are considered, and their decomposition into a direct sum of irreducible modules for the given action is studied. In case of S3-symmetry, the Lie algebras are coordinatized by some nonassociative systems, which are termed generalized Malcev algebras, as they extend the classical Malcev algebras. These systems are endowed with a binary and a ternary products, and include both the Malcev algebras and the Jordan triple systems.
[ { "version": "v1", "created": "Wed, 16 Jan 2008 12:35:54 GMT" } ]
2008-01-17T00:00:00
[ [ "Elduque", "Alberto", "" ], [ "Okubo", "Susumu", "" ] ]
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801.2482
Rene Unterdorfer
Rene Unterdorfer, Hannes Pichl
On the Radiative Pion Decay
22 pages, 2 figures
Eur.Phys.J.C55:273-283,2008
10.1140/epjc/s10052-008-0584-8
PSI-PR-07-05
hep-ph
null
A reanalysis of the radiative pion decay together with the calculation of the radiative corrections within chiral perturbation theory (CHPT) is performed. The amplitude of this decay contains an inner Bremsstrahlung contribution and a structure-dependent part that are both accessible in experiments. In order to obtain a reliable estimate of the hadronic contributions we combine the CHPT result with a large-N_C expansion and experimental data on other decays, which makes it possible to determine the occurring coupling constants.
[ { "version": "v1", "created": "Wed, 16 Jan 2008 16:44:41 GMT" } ]
2008-11-26T00:00:00
[ [ "Unterdorfer", "Rene", "" ], [ "Pichl", "Hannes", "" ] ]
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801.2483
Miroslav Pardy
Miroslav Pardy
Missing experiments in quantum mechanics
9 pages
null
null
null
quant-ph
null
We discuss the two-slit experiment and the Aharonov-Bohm (AB) experiment in the magnetic field. In such a case the electron moving in the magnetic field produces so called synchrotron radiation. In other words the photons are emitted from the points of the electron trajectory and it means that the trajectory of electron is visible in the synchrotron radiation spectrum. The axiomatic system of quantum mechanics does not enable to define the trajectory of the elementary particle. The two-slit experiment and AB experiment in a magnetic field was never performed and it means that they are the missing experiments of quantum mechanics. The extension of the discussion to the cosmical rays moving in the magnetic field of the Saturn magnetosphere and its rings is mentioned. It is related to the probe CASSINI. The solution of the problem in the framework of the hydrodynamical model of quantum mechanics and the nonlinear quantum mechanics is also mentioned.
[ { "version": "v1", "created": "Wed, 16 Jan 2008 12:41:23 GMT" } ]
2008-01-17T00:00:00
[ [ "Pardy", "Miroslav", "" ] ]
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801.2484
Ariel Goobar
Jakob Nordin, Ariel Goobar, Jakob Jonsson
Quantifying systematic uncertainties in supernova cosmology
Accepted for publication in JCAP
JCAP 0802:008,2008
10.1088/1475-7516/2008/02/008
null
astro-ph
null
Observations of Type Ia supernovae used to map the expansion history of the Universe suffer from systematic uncertainties that need to be propagated into the estimates of cosmological parameters. We propose an iterative Monte-Carlo simulation and cosmology fitting technique (SMOCK) to investigate the impact of sources of error upon fits of the dark energy equation of state. This approach is especially useful to track the impact of non-Gaussian, correlated effects, e.g. reddening correction errors, brightness evolution of the supernovae, K-corrections, gravitational lensing, etc. While the tool is primarily aimed for studies and optimization of future instruments, we use the ``Gold'' data-set in Riess et al. (2007) to show examples of potential systematic uncertainties that could exceed the quoted statistical uncertainties.
[ { "version": "v1", "created": "Wed, 16 Jan 2008 12:49:34 GMT" } ]
2009-06-23T00:00:00
[ [ "Nordin", "Jakob", "" ], [ "Goobar", "Ariel", "" ], [ "Jonsson", "Jakob", "" ] ]
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801.2485
M. M. Dworetsky
M. M. Dworetsky, J. L. Persaud, K. Patel
Xenon in Mercury-Manganese Stars
8 pages, 4 figures. Accepted by Monthly Notices of the Royal Astronomical Society, 8 January 2008
null
10.1111/j.1365-2966.2008.12937.x
null
astro-ph
null
Previous studies of elemental abundances in Mercury-Manganese (HgMn) stars have occasionally reported the presence of lines of the ionized rare noble gas Xe II, especially in a few of the hottest stars with Teff ~ 13000--15000 K. A new study of this element has been undertaken using observations from Lick Observatory's Hamilton Echelle Spectrograph. In this work, the spectrum synthesis program UCLSYN has been used to undertake abundance analysis assuming LTE. We find that in the Smith & Dworetsky sample of HgMn stars, Xe is vastly over-abundant in 21 of 22 HgMn stars studied, by factors of 3.1--4.8 dex. There does not appear to be a significant correlation of Xe abundance with Teff. A comparison sample of normal late B stars shows no sign of Xe II lines that could be detected, consistent with the expected weakness of lines at normal abundance. The main reason for the previous lack of widespread detection in HgMn stars is probably due to the strongest lines being at longer wavelengths than the photographic blue. The lines used in this work were 4603.03A, 4844.33A and 5292.22A.
[ { "version": "v1", "created": "Wed, 16 Jan 2008 13:06:55 GMT" } ]
2009-11-13T00:00:00
[ [ "Dworetsky", "M. M.", "" ], [ "Persaud", "J. L.", "" ], [ "Patel", "K.", "" ] ]
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801.2486
Gilles Lancien
Yves Dutrieux, Gilles Lancien
Isometric embeddings of compact spaces into Banach spaces
8 pages
null
null
null
math.FA
null
We show the existence of a compact metric space $K$ such that whenever $K$ embeds isometrically into a Banach space $Y$, then any separable Banach space is linearly isometric to a subspace of $Y$. We also address the following related question: if a Banach space $Y$ contains an isometric copy of the unit ball or of some special compact subset of a separable Banach space $X$, does it necessarily contain a subspace isometric to $X$? We answer positively this question when $X$ is a polyhedral finite-dimensional space, $c_0$ or $\ell_1$.
[ { "version": "v1", "created": "Wed, 16 Jan 2008 13:08:07 GMT" } ]
2008-01-17T00:00:00
[ [ "Dutrieux", "Yves", "" ], [ "Lancien", "Gilles", "" ] ]
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801.2487
Henri Gouin
Henri Gouin (MSNMGP, LMMT), Fran\c{c}oise Cubisol
On the number of droplets in aerosols
7 pages
Mechanics Research Communications 30, 5 (2003) 403-409
10.1016/S0093-6413(03)00043-0
null
physics.class-ph physics.ao-ph
null
The number of droplets which may be formed with a supersaturated vapor in presence of a gas cannot exceed a number proportional to (pv-pvo)4 where pv and pvo denote at the same temperature the pressure of the supersaturated vapor-gas mixture and the pressure of the saturated vapor-gas mixture. The energy necessary to the droplet formation is also bounded by a number proportional to (pv-pvo)2 .
[ { "version": "v1", "created": "Wed, 16 Jan 2008 13:12:37 GMT" } ]
2008-01-17T00:00:00
[ [ "Gouin", "Henri", "", "MSNMGP, LMMT" ], [ "Cubisol", "Françoise", "" ] ]
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801.2488
Pengbo Li
Peng Li
Generating entangled light with atomic ensembles
This paper has been withdrawn
null
null
null
quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This paper has been withdrawn by the author due to some problems.
[ { "version": "v1", "created": "Wed, 16 Jan 2008 13:27:10 GMT" }, { "version": "v2", "created": "Tue, 1 Apr 2008 08:39:06 GMT" }, { "version": "v3", "created": "Fri, 28 Nov 2008 01:09:45 GMT" } ]
2008-11-28T00:00:00
[ [ "Li", "Peng", "" ] ]
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801.2489
Mostafa Ellabban Dr.
M.A. Ellabban
Light-induced scattering and energy transfer between orthogonally-polarized waves
10 pages and 5 figures
null
null
null
physics.optics physics.gen-ph
null
We present a detailed experimental investigation on polarization-isotropic and polarization-anisotropic holographic scattering in lithium niobate crystal doped with iron when recording parasitic gratings with an ordinary polarized pump beam. The kinetics of both types of scattering during the whole process of recording is studied. Holographic scattering is presented as a simple technique to monitor the energy transfer between beams of different polarization. Moreover, the spectral and the angular dependence of the transmitted intensity of the crystal during the reconstruction of the auto-generated parasitic gratings are measured.
[ { "version": "v1", "created": "Wed, 16 Jan 2008 13:30:32 GMT" } ]
2008-01-17T00:00:00
[ [ "Ellabban", "M. A.", "" ] ]
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801.249
Akira Endo
Akira Endo and Yasuhiro Iye
The effect of oscillating Fermi energy on the line shape of the Shubnikov-de Haas oscillation in a two dimensional electron gas
7 pages,6 figures, minor revisions
J. Phys. Soc. Jpn. 77 (2008) 064713
10.1143/JPSJ.77.064713
null
cond-mat.mes-hall
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The line shape of the Shubnikov-de Haas (SdH) oscillation has been analyzed in detail for a GaAs/AlGaAs two-dimensional electron gas. The line shape, or equivalently the behavior of the Fourier components, of the experimentally observed SdH oscillation is well reproduced by the sinusoidal density of states at the Fermi energy that oscillates with a magnetic field in a saw-tooth shape to keep the electron density constant. This suggests that the broadening of each Landau level by disorder is better described by a Gaussian than by a Lorentzian.
[ { "version": "v1", "created": "Wed, 16 Jan 2008 13:31:52 GMT" }, { "version": "v2", "created": "Tue, 10 Jun 2008 04:08:14 GMT" } ]
2008-06-10T00:00:00
[ [ "Endo", "Akira", "" ], [ "Iye", "Yasuhiro", "" ] ]
[ -0.0514786094, -0.0425795168, 0.0249830075, 0.0853102878, 0.0346383974, 0.0287392829, -0.0208485853, -0.022285549, 0.0111616822, -0.035066966, 0.0476971269, 0.0002682491, 0.0157687906, 0.0074495245, -0.0034789657, 0.0438652225, -0.088083379, -0.0256888848, 0.0604029149, -0.0002052243, -0.0593945161, -0.0571760461, 0.0330501758, 0.0882850587, -0.0048844176, -0.0528399423, 0.079512015, 0.0329745449, 0.1307889521, -0.0281342454, 0.0126994858, -0.0695288926, 0.0259661935, -0.08283972, -0.0299493577, 0.0879825428, -0.0249577984, 0.0302014574, -0.0583357029, -0.0246930942, -0.0776464865, -0.1178814769, -0.0940329134, 0.1263519973, 0.1562005281, -0.0483273715, -0.0191217065, -0.0722011477, 0.0890917778, -0.0302266665, -0.0714952648, 0.0469912477, 0.0361509919, -0.067612946, -0.0133486409, -0.0060062581, 0.0617642477, 0.1024530232, 0.1144529358, 0.0018592299, 0.0748733953, 0.0190460775, 0.006920117, 0.0232435241, -0.0104999226, -0.0093087545, -0.0346131884, -0.0564701706, 0.0288149118, 0.0728566051, -0.0219452158, 0.0272266883, 0.0717473701, -0.005565085, -0.037134178, -0.0797641128, 0.0234199949, -0.0368568711, -0.0034600585, 0.1244360507, -0.044445049, 0.0429324545, 0.0149242589, 0.0228905864, -0.057327304, 0.0573777258, -0.0222729445, -0.0463609993, -0.12060415, 0.0865203664, 0.0254367869, 0.0178864226, -0.0428316146, 0.0099390019, 0.0174704585, -0.0197771639, 0.1002345532, 0.0034190924, 0.035066966, -0.0907556266, 0.0284367632, -0.0063497429, 0.0379408933, -0.0003659374, 0.0608566925, -0.0003312738, -0.0351678059, -0.027554417, 0.0184032246, -0.0066554127, 0.0694280565, -0.0214284118, 0.0209116098, 0.0002755363, -0.0706885532, 0.0043802196, 0.0597978756, 0.0368316583, -0.0458820127, 0.1387552768, -0.0576802455, 0.115360491, 0.0384955145, -0.0079726297, 0.0950917304, 0.0335543714, 0.0474702343, -0.1262511611, -0.1181840003, -0.0345123485, -0.0031449345, 0.0374871157, -0.1604357809, -0.0921169668, -0.0659490898, 0.0025398971, 0.0127373002, 0.0093528721, 0.0972093642, 0.0431089252, 0.0572264679, 0.0588398986, 0.1107218713, 0.0791086555, 0.0965539068, 0.132906571, -0.0717977881, -0.0579827614, -0.038092155, 0.0399828963, -0.0053760107, -0.0531424619, 0.0797136948, 0.0030094315, 0.074268356, -0.0279325657, 0.0687725991, 0.0070965858, 0.0197519548, -0.0410921313, -0.0110860523, 0.0727557614, -0.0746717155, 0.0275796279, 0.0853102878, 0.044621516, -0.1064866036, -0.0213149674, -0.0268233307, -0.2162000835, -0.0700835139, -0.1185873523, 0.0269745905, -0.0672095865, 0.1203016266, 0.0501676947, -0.0474450253, -0.0944866911, -0.0480500646, 0.0095986687, 0.0258023292, -0.0282855053, 0.0322686695, 0.0908564702, 0.0703860298, -0.0222729445, 0.0569239482, 0.011155379, 0.0242141057, 0.0065041534, -0.0571760461, 0.0351678059, 0.032823287, 0.0056092022, -0.0798649564, -0.0758817866, 0.0051900875, 0.0143192215, 0.0489828289, 0.0670583248, 0.0323695093, 0.0369577073, 0.0516802892, -0.0602012351, -0.1127386615, 0.0029968265, 0.0071596107, -0.064940691, 0.0863186866, 0.0758313686, -0.0004533842, 0.0094032912, 0.0864195302, -0.0114705032, -0.1070916429, -0.0024028183, -0.0131217511, 0.0067751599, 0.0517307073, 0.0678650439, -0.0135503197, 0.0144074559, 0.0632768422, 0.1094109565, 0.0768901855, 0.0240754522, 0.0565710105, 0.0714448467, -0.0934278816, 0.0980665013, -0.0235460438, 0.0368316583, -0.0552096739, -0.037134178, -0.043512281, 0.0334535316, -0.0381677859, -0.1020496637, -0.0978144035, -0.0678650439, -0.0824867859, 0.0525374264, 0.0706381351, 0.0303779263, -0.0504197925, 0.0614617281, -0.0024217258, -0.0163990371, 0.0746717155, -0.0120188184, -0.151561901, 0.0299493577, -0.1562005281, -0.0143444315, -0.0981673375, -0.0196132995 ]
801.2491
Pablo Maynar
P. Maynar, M. I. Garcia de Soria, G. Schehr, A. Barrat, E. Trizac
Dynamics of Annihilation II: Fluctuations of Global Quantities
19 pages
Phys. Rev. E 77, 051128 (2008)
10.1103/PhysRevE.77.051128
null
cond-mat.stat-mech
null
We develop a theory for fluctuations and correlations in a gas evolving under ballistic annihilation dynamics. Starting from the hierarchy of equations governing the evolution of microscopic densities in phase space, we subsequently restrict to a regime of spatial homogeneity, and obtain explicit predictions for the fluctuations and time correlation of the total number of particles, total linear momentum and total kinetic energy. Cross-correlations between these quantities are worked out as well. These predictions are successfully tested against Molecular Dynamics and Monte-Carlo simulations. This provides strong support for the theoretical approach developed, including the hydrodynamic treatment of the spectrum of the linearized Boltzmann operator. This article is a companion paper to arXiv:0801.2299 and makes use of the spectral analysis reported there.
[ { "version": "v1", "created": "Wed, 16 Jan 2008 13:44:31 GMT" } ]
2009-11-13T00:00:00
[ [ "Maynar", "P.", "" ], [ "de Soria", "M. I. Garcia", "" ], [ "Schehr", "G.", "" ], [ "Barrat", "A.", "" ], [ "Trizac", "E.", "" ] ]
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801.2492
Akira Endo
Akira Endo and Yasuhiro Iye
Modulation of the Shubnikov-de Haas Oscillation in Unidirectional Lateral Superlattices
10 pages, 8 figures; typos corrected
J. Phys. Soc. Jpn. 77 (2008) 054709
10.1143/JPSJ.77.054709
null
cond-mat.mes-hall
null
The amplitude and phase of Shubnikov-de Haas oscillations have been analyzed in detail for two-dimensional electron gases subjected to a weak unidirectional periodic potential modulation. The amplitude is suppressed, accompanied by inversion of the phase, at the maximum bandwidth conditions at low magnetic fields. The suppression is gradually taken over by the enhancement with the increase of the magnetic fields. The suppression and the enhancement are attributable to the collisional and the diffusion contribution of the modulated potential to the conductivity, respectively, the former (the latter) being dominant at low (high) magnetic fields. A theoretical calculation that takes the two types of contributions into account shows semi-quantitative agreement with experimental traces.
[ { "version": "v1", "created": "Wed, 16 Jan 2008 13:44:41 GMT" }, { "version": "v2", "created": "Sat, 3 May 2008 14:13:11 GMT" } ]
2008-05-03T00:00:00
[ [ "Endo", "Akira", "" ], [ "Iye", "Yasuhiro", "" ] ]
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801.2493
Dubi Kelmer
Dubi Kelmer
Scarring for Quantum Maps with Simple Spectrum
5 pages
Compositio Math. 147 (2011) 1608-1612
10.1112/S0010437X10005270
null
math-ph math.MP math.NT
null
We previously introduced a family of symplectic maps of the torus whose quantization exhibits scarring on invariant co-isotropic submanifolds. The purpose of this note is to show that in contrast to other examples, where failure of Quantum Unique Ergodicity is attributed to high multiplicities in the spectrum, for these examples the spectrum is (generically) simple.
[ { "version": "v1", "created": "Wed, 16 Jan 2008 14:09:07 GMT" } ]
2019-02-20T00:00:00
[ [ "Kelmer", "Dubi", "" ] ]
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801.2494
Andre Chatzistamatiou
Andre Chatzistamatiou
Motives of hypersurfaces of very small degree
11 pages
null
null
null
math.AG
null
We study the Chow motive (with rational coefficients) of a hypersurface X in the projective space by using the variety F(X) of l-dimensional planes contained in X. If the degree of X is sufficiently small we show that the primitive part of the motive of X is the tensor product of a direct summand in the motive of a suitable complete intersection in F(X) and the l-th twist Q(-l) of the Lefschetz motive.
[ { "version": "v1", "created": "Wed, 16 Jan 2008 14:50:15 GMT" } ]
2008-01-17T00:00:00
[ [ "Chatzistamatiou", "Andre", "" ] ]
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801.2495
Stefano Agrestini
S. Agrestini, C. Mazzoli, A. Bombardi and M.R. Lees
Incommensurate magnetic ground state revealed by RXS in the frustrated spin system Ca3Co2O6
RevTex 4, 5 pages + 3 figures
Phys. Rev. B 77, 140403(R) (2008)
10.1103/PhysRevB.77.140403
null
cond-mat.other cond-mat.str-el
null
We have performed a resonant x-ray scattering study at the Co pre-K edge on a single crystal of Ca3Co2O6. The measurements reveal an abrupt transition to a magnetically ordered state immediately below T_N = 25 K, with a magnetic correlation length in excess of 5500 {\AA} along the c-axis chains. There is no evidence for modifications to the Co$^{3+}$ spin state. A temperature dependent modulation in the magnetic order along the c-axis and an unusual decrease in the magnetic correlation lengths on cooling are observed. The results are compatible with the onset of a partially disordered antiferromagnetic structure in Ca3Co2O6.
[ { "version": "v1", "created": "Wed, 16 Jan 2008 14:14:57 GMT" } ]
2008-05-10T00:00:00
[ [ "Agrestini", "S.", "" ], [ "Mazzoli", "C.", "" ], [ "Bombardi", "A.", "" ], [ "Lees", "M. R.", "" ] ]
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801.2496
Anatoly Vershik M
A.M.Vershik, A.N.Sergeev
A new approach to the representation theory of the symmetric groups. IV. $ \Bbb Z_{2}$-graded groups and algebras
30 pp. Ref.23
null
null
null
math.RT math.QA
null
We start with definitions of the general notions of the theory of $\Bbb Z_{2}$-graded algebras. Then we consider theory of inductive families of $\Bbb Z_{2}$-graded semisimple finite-dimensional algebras and its representations in the spirit of approach of the papers \cite{VO,OV} to representation theory of symmetric groups. The main example is the classical - theory of the projective representations of symmetric groups.
[ { "version": "v1", "created": "Wed, 16 Jan 2008 14:22:42 GMT" } ]
2008-01-17T00:00:00
[ [ "Vershik", "A. M.", "" ], [ "Sergeev", "A. N.", "" ] ]
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801.2497
Mario Melita Dr.
M. D. Melita (IAFE, UBA, CONICET Argentina), J. Licandro, (Instituto de Astrof\'isica de Canarias, Tenerife, Spain.) Jones, D. C. (Astronomy Unit, Queen Mary College, University of London, UK), I. P. Williams (Astronomy Unit, Queen Mary College, University of London, UK)
Physical and orbital properties of the Trojan asteroids
Accepted in Icarus
null
null
null
astro-ph
null
All the Trojan asteroids orbit about the Sun at roughly the same heliocentric distance as Jupiter. Differences in the observed visible reflection spectra range from neutral to red, with no ultra-red objects found so far. Given that the Trojan asteroids are collisionally evolved, a certain degree of variability is expected. Additionally, cosmic radiation and sublimation are important factors in modifying icy surfaces even at those large heliocentric distances. We search for correlations between physical and dynamical properties, we explore relationships between the following four quantities; the normalised visible reflectivity indexes ($S'$), the absolute magnitudes, the observed albedos and the orbital stability of the Trojans. We present here visible spectroscopic spectra of 25 Trojans. This new data increase by a factor of about 5 the size of the sample of visible spectra of Jupiter Trojans on unstable orbits. The observations were carried out at the ESO-NTT telescope (3.5m) at La Silla, Chile, the ING-WHT (4.2m) and NOT (2.5m) at Roque de los Muchachos observatory, La Palma, Spain. We have found a correlation between the size distribution and the orbital stability. The absolute-magnitude distribution of the Trojans in stable orbits is found to be bimodal, while the one of the unstable orbits is unimodal, with a slope similar to that of the small stable Trojans. This supports the hypothesis that the unstable objects are mainly byproducts of physical collisions. The values of $S'$ of both the stable and the unstable Trojans are uniformly distributed over a wide range, from $0 %/1000\AA $ to about $15 %/1000\AA$. The values for the stable Trojans tend to be slightly redder than the unstable ones, but no significant statistical difference is found.
[ { "version": "v1", "created": "Wed, 16 Jan 2008 14:34:15 GMT" } ]
2008-01-17T00:00:00
[ [ "Melita", "M. D.", "", "IAFE, UBA, CONICET Argentina" ], [ "Licandro", "J.", "", "Astronomy Unit,\n Queen Mary College, University of London, UK" ], [ "Jones", "", "", "Astronomy Unit,\n Queen Mary College, University of London, UK" ], [ "C.", "D.", "", "Astronomy Unit,\n Queen Mary College, University of London, UK" ], [ "Williams", "I. P.", "", "Astronomy\n Unit, Queen Mary College, University of London, UK" ] ]
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801.2498
Alexis B\`es
Alexis B\`es
An Application of the Feferman-Vaught Theorem to Automata and Logics for<br> Words over an Infinite Alphabet
24 pages
Logical Methods in Computer Science, Volume 4, Issue 1 (March 25, 2008) lmcs:1202
10.2168/LMCS-4(1:8)2008
null
cs.LO
null
We show that a special case of the Feferman-Vaught composition theorem gives rise to a natural notion of automata for finite words over an infinite alphabet, with good closure and decidability properties, as well as several logical characterizations. We also consider a slight extension of the Feferman-Vaught formalism which allows to express more relations between component values (such as equality), and prove related decidability results. From this result we get new classes of decidable logics for words over an infinite alphabet.
[ { "version": "v1", "created": "Wed, 16 Jan 2008 14:39:27 GMT" }, { "version": "v2", "created": "Tue, 25 Mar 2008 12:02:49 GMT" } ]
2015-07-01T00:00:00
[ [ "Bès", "Alexis", "" ] ]
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801.2499
Didier Henrion
Didier Henrion (LAAS, Fel-Cvut), Michael Sebek (FEL-Cvut)
Plane geometry and convexity of polynomial stability regions
null
null
null
null
math.OC
null
The set of controllers stabilizing a linear system is generally non-convex in the parameter space. In the case of two-parameter controller design (e.g. PI control or static output feedback with one input and two outputs), we observe however that quite often for benchmark problem instances, the set of stabilizing controllers seems to be convex. In this note we use elementary techniques from real algebraic geometry (resultants and Bezoutian matrices) to explain this phenomenon. As a byproduct, we derive a convex linear matrix inequality (LMI) formulation of two-parameter fixed-order controller design problem, when possible.
[ { "version": "v1", "created": "Wed, 16 Jan 2008 14:40:09 GMT" } ]
2008-01-17T00:00:00
[ [ "Henrion", "Didier", "", "LAAS, Fel-Cvut" ], [ "Sebek", "Michael", "", "FEL-Cvut" ] ]
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801.25
Martin W. Zwierlein
Wolfgang Ketterle and Martin W. Zwierlein
Making, probing and understanding ultracold Fermi gases
Long review article, 206 pages, 74 figures, to appear in Ultracold Fermi Gases, Proceedings of the International School of Physics "Enrico Fermi", Course CLXIV, Varenna, 20 - 30 June 2006, edited by M. Inguscio, W. Ketterle, and C. Salomon (IOS Press, Amsterdam) 2008
null
10.1393/ncr/i2008-10033-1
null
cond-mat.other cond-mat.str-el
null
A review on superfluidity and the BEC-BCS crossover in ultracold Fermi gases.
[ { "version": "v1", "created": "Wed, 16 Jan 2008 05:48:49 GMT" } ]
2009-11-13T00:00:00
[ [ "Ketterle", "Wolfgang", "" ], [ "Zwierlein", "Martin W.", "" ] ]
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801.2501
Pouria Pedram
P. Pedram, G. R. Jafari
Mona Lisa, the stochastic view and fractality in color space
16 pages, 5 figures, to appear in Int. J. Mod. Phys. C
Int. J. Mod. Phys. C 19 (2008) 855
10.1142/S0129183108012558
null
physics.data-an
null
A painting consists of objects which are arranged in specific ways. The art of painting is drawing the objects, which can be considered as known trends, in an expressive manner. Detrended methods are suitable for characterizing the artistic works of the painter by eliminating trends. It means that we study the paintings, regardless of its apparent purpose, as a stochastic process. We apply multifractal detrended fluctuation analysis to characterize the statistical properties of Mona Lisa, as an instance, to exhibit the fractality of the painting. Our results show that Mona Lisa is long range correlated and almost behaves similar in various scales.
[ { "version": "v1", "created": "Wed, 16 Jan 2008 14:55:32 GMT" } ]
2010-11-30T00:00:00
[ [ "Pedram", "P.", "" ], [ "Jafari", "G. R.", "" ] ]
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801.2502
Antony Carrington
O.J. Taylor, A. Carrington, and J.A. Schlueter
Superconductor-Insulator Phase Separation Induced by Rapid Cooling in kappa-(ET)_2Cu[N(CN)_2]Br
4 pages, to appear in Phys. Rev. B (Rapid Comm)
Phys. Rev. B 77, 060503(R), 2008
10.1103/PhysRevB.77.060503
null
cond-mat.supr-con cond-mat.str-el
null
We present measurements of the low temperature specific heat of single crystals of kappa-(ET)_2Cu[N(CN)_2]Br as a function of the cooling rate through the glasslike structure transition at $\sim$ 80K. We find that rapid cooling produces a small (< 4%) decrease in the superconducting transition temperature accompanied by a substantial (up to 50%) decrease in the normal-state electronic specific heat. A natural explanation of our data is that there is a macroscopic phase separation between superconducting and insulating regions in rapidly cooled samples.
[ { "version": "v1", "created": "Wed, 16 Jan 2008 14:46:09 GMT" } ]
2009-11-13T00:00:00
[ [ "Taylor", "O. J.", "" ], [ "Carrington", "A.", "" ], [ "Schlueter", "J. A.", "" ] ]
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801.2503
Edward Sion
Ryan T. Hamilton, Edward M. Sion
Far Ultraviolet Spectral Analysis of the Prototype Nova-Like Variable VY Sculptoris from the High State to the Low State
Accepted for publication in the PASP (to appear in February, 2008 issue)
null
10.1086/528939
null
astro-ph
null
The prototype nova-like variable VY Sculptoris was observed by the IUE during four different optical brightness states of the system. The FUV flux level from the highest state to the lowest state declines by a factor of 28. We have carried out model accretion disk and white dwarf atmosphere fitting to the spectra. The corresponding accretion rates range from $\dot{M}= 8 \times 10^{-9}$M$_{\sun}$ yr$^{-1}$ at the highest FUV flux level down to $\dot{M}= 1.9\times 10^{-10}$M$_{\sun}$ yr$^{-1}$ at the lowest flux level. We report tentative evidence for the detection of the underlying white dwarf with $T_{\rm eff} = 45,000$K in the spectrum with the lowest flux level.
[ { "version": "v1", "created": "Wed, 16 Jan 2008 14:48:57 GMT" } ]
2009-11-13T00:00:00
[ [ "Hamilton", "Ryan T.", "" ], [ "Sion", "Edward M.", "" ] ]
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801.2504
Chlo\'e F\'eron
Chlo\'e F\'eron and Jens Hjorth
Simulated Dark-Matter Halos as a Test of Nonextensive Statistical Mechanics
Accepted for publication in Physical Review E
Phys.Rev.E77:022106,2008
10.1103/PhysRevE.77.022106
null
astro-ph cond-mat.stat-mech
null
In the framework of nonextensive statistical mechanics, the equilibrium structures of astrophysical self-gravitating systems are stellar polytropes, parameterized by the polytropic index n. By careful comparison to the structures of simulated dark-matter halos we find that the density profiles, as well as other fundamental properties, of stellar polytropes are inconsistent with simulations for any value of n. This result suggests the need to reconsider the applicability of nonextensive statistical mechanics (in its simplest form) to equilibrium self-gravitating systems.
[ { "version": "v1", "created": "Wed, 16 Jan 2008 14:49:34 GMT" } ]
2009-06-23T00:00:00
[ [ "Féron", "Chloé", "" ], [ "Hjorth", "Jens", "" ] ]
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801.2505
Mikhail Sodin
Mikhail Sodin, Boris Tsirelson
Uniformly spread measures and vector fields
11 pages
Zap. Nauchn. Sem. S.-Peterburg. Otdel. Mat. Inst. Steklov. (POMI) 366 (2009), Issledovaniya po Lineinym Operatoram i Teorii Funktsii. 37, 116--127
null
null
math.CA math.PR
null
We show that two different ideas of uniform spreading of locally finite measures in the d-dimensional Euclidean space are equivalent. The first idea is formulated in terms of finite distance transportations to the Lebesgue measure, while the second idea is formulated in terms of vector fields connecting a given measure with the Lebesgue measure.
[ { "version": "v1", "created": "Wed, 16 Jan 2008 14:50:06 GMT" } ]
2016-12-21T00:00:00
[ [ "Sodin", "Mikhail", "" ], [ "Tsirelson", "Boris", "" ] ]
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801.2506
Akbar Fahmi Shakib
A. Fahmi and M. Golshani
Comment on "Quantum Key Distribution in the Holevo Limit"
REVTeX4, 1 page, no figure, A. Cabello Reply, Physical Review Letters 100, 018902 (2008)
Physical Review Letters 100, 018901 (2008)
10.1103/PhysRevLett.100.018901
null
quant-ph
null
In a Letter, Cabello proposed a quantum key distribution (QKD) Protocol which attended to Holevo limit. In this comment, we show that Eve could use a simple plan to distinguish among quantum keys, without being detected by Alice and Bob. In following, we show that our approach is not restricted to Cabello Protocol. With attention to our Eavesdropping approach, it seems that Mor's arguments for no-cloning principal for orthogonal states is not general enough to avoid eavesdropping.
[ { "version": "v1", "created": "Wed, 16 Jan 2008 15:09:20 GMT" } ]
2009-11-13T00:00:00
[ [ "Fahmi", "A.", "" ], [ "Golshani", "M.", "" ] ]
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801.2507
Ivan Marin
Ivan Marin
Characters of the Grothendieck-Teichmueller group through rigidity of the Burau representation
null
null
null
null
math.RT math.GR
null
We present examples of characters of absolute Galois groups of number fields that can be recovered through their action by automorphisms on the profinite completion of the braid groups, using a ``rigidity'' approach. The way we use to recover them is through classical representations of the braid groups, and in particular through the Burau representation. This enables one to extend these characters to Grothendieck-Teichmueller groups.
[ { "version": "v1", "created": "Wed, 16 Jan 2008 15:09:47 GMT" } ]
2008-01-17T00:00:00
[ [ "Marin", "Ivan", "" ] ]
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801.2508
Adan Cabello
Adan Cabello
Reply to Fahmi and Golshani's comment on "Quantum key distribution in the Holevo limit"
REVTeX4, 1 page
Phys. Rev. Lett. 100 (2008) 018902
10.1103/PhysRevLett.100.018902
null
quant-ph
null
As Fahmi and Golshani correctly point out, a protocol introduced in A. Cabello, Phys. Rev. Lett. 85, 5635 (2000), to show that a quantum key distribution protocol can have efficiency one (i.e., can achieve the Holevo limit), does indeed not have efficiency one. The corrected protocol, introduced in A. Cabello, Recent. Res. Devel. Physics 2, 249 (2001), is reproduced here.
[ { "version": "v1", "created": "Wed, 16 Jan 2008 15:12:00 GMT" } ]
2009-07-28T00:00:00
[ [ "Cabello", "Adan", "" ] ]
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801.2509
Akihiko Inoue
Akihiko Inoue, Yukio Kasahara and Punam Phartyal
Baxter's inequality for fractional Brownian motion-type processes with Hurst index less than 1/2
7 pages
null
null
null
math.PR math.ST stat.TH
null
The aim of this paper is to prove an analogue of Baxter's inequality for fractional Brownian motion-type processes with Hurst index less than 1/2. This inequality is concerned with the norm estimate of the difference between finite- and infinite-past predictor coefficients.
[ { "version": "v1", "created": "Wed, 16 Jan 2008 15:12:02 GMT" } ]
2008-01-17T00:00:00
[ [ "Inoue", "Akihiko", "" ], [ "Kasahara", "Yukio", "" ], [ "Phartyal", "Punam", "" ] ]
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801.251
Marcel Ausloos
J. Gillet and M. Ausloos
A Comparison of natural (english) and artificial (esperanto) languages. A Multifractal method based analysis
7 pages, 4 double figures, 45 references
null
null
null
cs.CL physics.data-an
null
We present a comparison of two english texts, written by Lewis Carroll, one (Alice in wonderland) and the other (Through a looking glass), the former translated into esperanto, in order to observe whether natural and artificial languages significantly differ from each other. We construct one dimensional time series like signals using either word lengths or word frequencies. We use the multifractal ideas for sorting out correlations in the writings. In order to check the robustness of the methods we also write the corresponding shuffled texts. We compare characteristic functions and e.g. observe marked differences in the (far from parabolic) f(alpha) curves, differences which we attribute to Tsallis non extensive statistical features in the ''frequency time series'' and ''length time series''. The esperanto text has more extreme vallues. A very rough approximation consists in modeling the texts as a random Cantor set if resulting from a binomial cascade of long and short words (or words and blanks). This leads to parameters characterizing the text style, and most likely in fine the author writings.
[ { "version": "v1", "created": "Wed, 16 Jan 2008 14:07:33 GMT" } ]
2008-01-17T00:00:00
[ [ "Gillet", "J.", "" ], [ "Ausloos", "M.", "" ] ]
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801.2511
Michail Loulakis
In\'es Armend\'ariz, Michail Loulakis
Thermodynamic Limit for the Invariant Measures in Supercritical Zero Range Processes
null
Prob. Th. Rel. Fields 145 (2009) no.1-2, 175-188
10.1007/s00440-008-0165-7
null
math.PR cond-mat.stat-mech
null
We prove a strong form of the equivalence of ensembles for the invariant measures of zero range processes conditioned to a supercritical density of particles. It is known that in this case there is a single site that accomodates a macroscopically large number of the particles in the system. We show that in the thermodynamic limit the rest of the sites have joint distribution equal to the grand canonical measure at the critical density. This improves the result of Gro\ss kinsky, Sch\"{u}tz and Spohn, where convergence is obtained for the finite dimensional marginals. We obtain as corollaries limit theorems for the order statistics of the components and for the fluctuations of the bulk.
[ { "version": "v1", "created": "Wed, 16 Jan 2008 15:14:22 GMT" } ]
2009-12-08T00:00:00
[ [ "Armendáriz", "Inés", "" ], [ "Loulakis", "Michail", "" ] ]
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801.2512
Dmitry Zhuridov Dr.
A. Ali (DESY, Hamburg), A.V. Borisov and D.V. Zhuridov (MSU, Mosow)
Electron angular correlation in neutrinoless double beta decay and new physics
5 pages, 1 figure; new version takes into account recent correction of arXiv:0706.4165
null
10.1142/9789812837592_0026
null
hep-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The angular correlation of the electrons in the neutrinoless double beta decay ($0\nu2\beta$) is calculated taking into account the nucleon recoil, the $S$ and $P$-waves for the electrons and the electron mass using a general Lorentz invariant effective Lagrangian. We show that the angular coefficient is essentially independent of the nuclear matrix element models. We work out the angular coefficient in several scenarios for new physics, in particular, in the left-right symmetric models.
[ { "version": "v1", "created": "Wed, 16 Jan 2008 15:19:03 GMT" }, { "version": "v2", "created": "Thu, 28 Apr 2022 14:08:37 GMT" } ]
2022-04-29T00:00:00
[ [ "Ali", "A.", "", "DESY, Hamburg" ], [ "Borisov", "A. V.", "", "MSU, Mosow" ], [ "Zhuridov", "D. V.", "", "MSU, Mosow" ] ]
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801.2513
Jaiyeola Temitope Gbolahan
Temitope Gbolahan Jaiyeola
A Pair of Smarandachely Isotopic Quasigroups and Loops of the Same Variety
10 pages
International Journal of Mathematical Combinatorics, Vol 1(2008), 36-44
null
null
math.GM
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The isotopic invariance or universality of types and varieties of quasigroups and loops described by one or more equivalent identities has been of interest to researchers in loop theory in the recent past. A variety of quasigroups(loops) that are not universal have been found to be isotopic invariant relative to a special type of isotopism or the other. Presently, there are two outstanding open problems on universality of loops: semi automorphic inverse property loops(1999) and Osborn loops(2005). Smarandache isotopism(S-isotopism) was originally introduced by Vasantha Kandasamy in 2002. But in this work, the concept is re-restructured in order to make it more explorable. As a result of this, the theory of Smarandache isotopy inherits the open problems as highlighted above for isotopy. In this short note, the question 'Under what type of S-isotopism will a pair of S-quasigroups(S-loops) form any variety?' is answered by presenting a pair of specially S-isotopic S-quasigroups(loops) that both belong to the same variety of S-quasigroups(S-loops). This is important because pairs of specially S-isotopic S-quasigroups(e.g Smarandache cross inverse property quasigroups) that are of the same variety are useful for applications(e.g cryptography).
[ { "version": "v1", "created": "Wed, 16 Jan 2008 15:21:08 GMT" }, { "version": "v2", "created": "Thu, 5 Jun 2008 09:23:04 GMT" } ]
2008-06-05T00:00:00
[ [ "Jaiyeola", "Temitope Gbolahan", "" ] ]
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801.2514
Alexander Jurisch
Alexander Jurisch, Jan-Michael Rost
Trapping cold Atoms by Quantum Reflection
10 pages, 7 figures
null
10.1103/PhysRevA.77.043603
null
quant-ph
null
We examine the properties of a quantum reflection trap when particle-interaction is included. We explore the influence of the particle-interaction on the trapping for different regimes: repulsive particle-interaction and attractive particle-interaction in its stable and unstable limit. With variational techniques, we calculate the phase-diagram of the quatum reflection trap and determine the stable and unstable regimes of the system.
[ { "version": "v1", "created": "Wed, 16 Jan 2008 16:09:36 GMT" } ]
2009-11-13T00:00:00
[ [ "Jurisch", "Alexander", "" ], [ "Rost", "Jan-Michael", "" ] ]
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801.2515
Konstantin Arutyunov
M. Zgirski, K. P. Riikonen, V. Tuboltsev, P. Jalkanen, T. T. Hongisto and K. Yu Arutyunov
Ion beam shaping and downsizing of nanostructures
14 pages, 6 figures
Nanotechnology 19 055301 (2008)
10.1088/0957-4484/19/05/055301
null
cond-mat.mes-hall cond-mat.mtrl-sci
null
We report a new approach for progressive and well-controlled downsizing of nanostructures below the 10 nm scale. Low energetic ion beam (Ar+) is used for gentle surface erosion, progressively shrinking the dimensions with ~ 1 nm accuracy. The method enables shaping of nanostructure geometry and polishing the surface. The process is clean room / high vacuum compatible being suitable for various applications. Apart from technological advantages, the method enables study of various size phenomena on the same sample between sessions of ion beam treatment.
[ { "version": "v1", "created": "Wed, 16 Jan 2008 15:34:37 GMT" } ]
2015-05-13T00:00:00
[ [ "Zgirski", "M.", "" ], [ "Riikonen", "K. P.", "" ], [ "Tuboltsev", "V.", "" ], [ "Jalkanen", "P.", "" ], [ "Hongisto", "T. T.", "" ], [ "Arutyunov", "K. Yu", "" ] ]
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801.2516
Konstantin Arutyunov
M. Zgirski, K.-P. Riikonen, V. Touboltsev and K.Yu. Arutyunov
Quantum fluctuations in ultranarrow superconducting nanowires
18 pages, 5 figures
Phys. Rev. B. 77, 054508 (2008)
10.1103/PhysRevB.77.054508
null
cond-mat.supr-con cond-mat.mes-hall
null
Progressive reduction of the effective diameter of a nanowire is applied to trace evolution of the shape of superconducting transition $R(T)$ in quasi-one-dimensional aluminum structures. In nanowires with effective diameter $\leq$ 15 nm the $R(T)$ dependences are much wider than predicted by the model of thermally activated phase slips. The effect can be explained by quantum fluctuations of the order parameter. Negative magnetoresistance is observed in the thinest samples. Experimental results are in reasonable agreement with existing theoretical models. The effect should have a universal validity indicating a breakdown of zero resistance state in a superconductor below a certain scale.
[ { "version": "v1", "created": "Wed, 16 Jan 2008 15:18:03 GMT" } ]
2009-11-13T00:00:00
[ [ "Zgirski", "M.", "" ], [ "Riikonen", "K. -P.", "" ], [ "Touboltsev", "V.", "" ], [ "Arutyunov", "K. Yu.", "" ] ]
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801.2517
Ahmed Ali
A. Ali (DESY, Hamburg), A.V. Borisov and M.V. Sidorova (MSU, Moscow)
Bilinear R-parity Violation in Rare Meson Decays
5 pages, 1 figure; To appear in the Proceedings of the 13th Lomonosov Conference on Elementary Particle Physics, 23 -- 29 August, 2007, Moscow, Russia
null
10.1142/9789812837592_0048
null
hep-ph
null
We discuss rare meson decays $K^ + \to \pi ^ - \ell ^ + \ell '^ +$ and $D^ + \to K^ - \ell ^ + \ell '^ +$ ($\ell ,\ell ' = e,\mu $) in a supersymmetric extension of the standard model with explicit breaking of R-parity by bilinear Yukawa couplings in the superpotential. Estimates of the branching ratios for these decays are given. We also compare our numerical results with analogous ones previously obtained for two other mechanisms of lepton number violation: exchange by massive Majorana neutrinos and trilinear R-parity violation.
[ { "version": "v1", "created": "Wed, 16 Jan 2008 15:37:44 GMT" } ]
2017-08-23T00:00:00
[ [ "Ali", "A.", "", "DESY, Hamburg" ], [ "Borisov", "A. V.", "", "MSU, Moscow" ], [ "Sidorova", "M. V.", "", "MSU, Moscow" ] ]
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801.2518
Paolo Franzetti
P. Franzetti, M. Scodeggio, B. Garilli, M. Fumana, L. Paioro
GOSSIP, a new VO compliant tool for SED fitting
4 pages, 2 figures. To appear in the ADASS XVII conference proceeding. ASP conference series
null
null
null
astro-ph
null
We present GOSSIP (Galaxy Observed-Simulated SED Interactive Program), a new tool developed to perform SED fitting in a simple, user friendly and efficient way. GOSSIP automatically builds-up the observed SED of an object (or a large sample of objects) combining magnitudes in different bands and eventually a spectrum; then it performs a chi-square minimization fitting procedure versus a set of synthetic models. The fitting results are used to estimate a number of physical parameters like the Star Formation History, absolute magnitudes, stellar mass and their Probability Distribution Functions. User defined models can be used, but GOSSIP is also able to load models produced by the most commonly used synthesis population codes. GOSSIP can be used interactively with other visualization tools using the PLASTIC protocol for communications. Moreover, since it has been developed with large data sets applications in mind, it will be extended to operate within the Virtual Observatory framework. GOSSIP is distributed to the astronomical community from the PANDORA group web site (http://cosmos.iasf-milano.inaf.it/pandora/gossip.html)
[ { "version": "v1", "created": "Wed, 16 Jan 2008 15:40:41 GMT" } ]
2008-01-17T00:00:00
[ [ "Franzetti", "P.", "" ], [ "Scodeggio", "M.", "" ], [ "Garilli", "B.", "" ], [ "Fumana", "M.", "" ], [ "Paioro", "L.", "" ] ]
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801.2519
Allard Jan van Marle
Stanley P. Owocki, Allard Jan van Marle
Luminous Blue Variables & Mass Loss near the Eddington Limit
Conference proceedings, Massive Stars as Cosmic Engines, IAU Symp 250, ed. F. Bresolin, P. A. Crowther, & J. Puls (Cambridge Univ. Press)
null
10.1017/S1743921308020358
null
astro-ph
null
During the course of their evolution, massive stars lose a substantial fraction of their initial mass, both through steady winds and through relatively brief eruptions during their Luminous Blue Variable (LBV) phase. This talk reviews the dynamical driving of this mass loss, contrasting the line-driving of steady winds to the potential role of continuum driving for eruptions during LBV episodes when the star exceeds the Eddington limit. A key theme is to emphasize the inherent limits that self-shadowing places on line-driven mass loss rates, whereas continuum driving can in principle drive mass up to the "photon-tiring" limit, for which the energy to lift the wind becomes equal to the stellar luminosity. We review how the "porosity" of a highly clumped atmosphere can regulate continuum-driven mass loss, but also discuss recent time-dependent simulations of how base mass flux that exceeds the tiring limit can lead to flow stagnation and a complex, time-dependent combination of inflow and outflow regions. A general result is thus that porosity-mediated continuum driving in super-Eddington phases can explain the large, near tiring-limit mass loss inferred for LBV giant eruptions.
[ { "version": "v1", "created": "Wed, 16 Jan 2008 15:52:37 GMT" } ]
2009-11-13T00:00:00
[ [ "Owocki", "Stanley P.", "" ], [ "van Marle", "Allard Jan", "" ] ]
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801.252
Luciano da Fontoura Costa
Luciano da Fontoura Costa
Synchronization of Non-Linear Random Walk Dynamics in Complex Network
8 pages, 8 figures. A working manuscript: suggestions and comments welcomed
null
null
null
physics.soc-ph cond-mat.dis-nn physics.comp-ph
null
This work addresses synchronization in transient, non-linear stochastic dynamics corresponding to accesses performed by self-avoiding walks originating at each node of a complex network. More specifically, the synchronizability of accesses incoming from other nodes has been considered and quantified in terms of the entropy of the mean periods of access, being closely associated to the efficiency of access delivery to each node. The concept of synchronous support of a node $i$ has also been suggested as corresponding to the nodes which contribute the most for the synchronization of the accesses to $i$. These concepts have been applied to the analysis of 6 networks of different types, leading to markedly smaller synchronizability being obtained for the Watts-Strogatz and a geographical models. The more uniform synchronizabilities were identified for the Watts-Strogatz and path-regular structures. Varying degrees of correlations were found between the synchronizability and the degree or outward accessibility of the nodes. The synchronous support of a node $i$ has been found to present diverse structure, including nodes which may be near to $i$, or nodes which are scattered through the network and far away from $i$.
[ { "version": "v1", "created": "Wed, 16 Jan 2008 15:46:04 GMT" } ]
2008-01-17T00:00:00
[ [ "Costa", "Luciano da Fontoura", "" ] ]
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801.2521
Wilfried Schoepe
R. H\"anninen and W. Schoepe
Frequency Dependence of the Critical Velocity of a Sphere Oscillating in Superfluid Helium-4
3 pages, 1 figure
null
null
null
cond-mat.other
null
It is shown that the critical velocity of a small sphere oscillating in superfluid helium increases with the square root of the oscillation frequency. This behavior can be described by a simple dimensional argument. The size of the sphere and the temperature of the superfluid are found to have no or only very little effect. Surface properties of the sphere and remanent vorticity may have an influence but have not been under systematic investigation in these measurements
[ { "version": "v1", "created": "Wed, 16 Jan 2008 15:49:52 GMT" } ]
2008-01-17T00:00:00
[ [ "Hänninen", "R.", "" ], [ "Schoepe", "W.", "" ] ]
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801.2522
Jouko Mickelsson
Pedram Hekmati and Jouko Mickelsson
Fractional Loop Group and Twisted K-Theory
Final version in Commun. Math. Phys
Commun.Math.Phys.299 (3):741-763,2010
10.1007/s00220-010-1108-6
null
math.DG hep-th math-ph math.MP
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study the structure of abelian extensions of the group $L_qG$ of $q$-differentiable loops (in the Sobolev sense), generalizing from the case of central extension of the smooth loop group. This is motivated by the aim of understanding the problems with current algebras in higher dimensions. Highest weight modules are constructed for the Lie algebra. The construction is extended to the current algebra of supersymmetric Wess-Zumino-Witten model. An application to the twisted K-theory on $G$ is discussed.
[ { "version": "v1", "created": "Wed, 16 Jan 2008 15:58:31 GMT" }, { "version": "v2", "created": "Fri, 19 Dec 2008 14:41:06 GMT" }, { "version": "v3", "created": "Sat, 1 Aug 2009 09:17:58 GMT" }, { "version": "v4", "created": "Thu, 8 Mar 2012 10:02:24 GMT" } ]
2012-03-09T00:00:00
[ [ "Hekmati", "Pedram", "" ], [ "Mickelsson", "Jouko", "" ] ]
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801.2523
Veronica Dexheimer
V. Dexheimer, S. Schramm, H. Stoecker
Proto-Neutron and Neutron Stars
Prepared for International Workshop on Astronomy and Relativistic Astrophysics (IWARA 2007), Joao Pessoa, Brazil, 3-6 Oct 2007
null
null
null
astro-ph
null
The parity doublet model, containing the SU(2) multiplets including the baryons identified as the chiral partners of the nucleons is applied to neutron stars. The maximum mass for the star is calculated for different stages of the cooling taking into account finite temperature/entropy effect, trapped neutrinos and fixed baryon number. Rotation effects are also included.
[ { "version": "v1", "created": "Wed, 16 Jan 2008 16:00:19 GMT" } ]
2008-01-17T00:00:00
[ [ "Dexheimer", "V.", "" ], [ "Schramm", "S.", "" ], [ "Stoecker", "H.", "" ] ]
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801.2524
Dominique Rossin
Mathilde Bouvel (LIAFA), Dominique Rossin (LIAFA)
A variant of the tandem duplication - random loss model of genome rearrangement
null
Theoretical Computer Science 410, 8-10 (2009)
10.1016/j.tcs.2008.11.017
null
math.CO q-bio.GN
null
In Soda'06, Chaudhuri, Chen, Mihaescu and Rao study algorithmic properties of the tandem duplication - random loss model of genome rearrangement, well-known in evolutionary biology. In their model, the cost of one step of duplication-loss of width k is $\alpha^k$ for $\alpha =1$ or $\alpha >=2 $. In this paper, we study a variant of this model, where the cost of one step of width $k$ is 1 if $k <= K$ and $\infty$ if $k > K$, for any value of the parameter $K in N$. We first show that permutations obtained after $p$ steps of width $K$ define classes of pattern-avoiding permutations. We also compute the numbers of duplication-loss steps of width $K$ necessary and sufficient to obtain any permutation of $S_n$, in the worst case and on average. In this second part, we may also consider the case $K=K(n)$, a function of the size $n$ of the permutation on which the duplication-loss operations are performed.
[ { "version": "v1", "created": "Wed, 16 Jan 2008 16:03:05 GMT" } ]
2011-12-06T00:00:00
[ [ "Bouvel", "Mathilde", "", "LIAFA" ], [ "Rossin", "Dominique", "", "LIAFA" ] ]
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801.2525
Walter Whiteley
Brigitte Servatius, Offer Shai, Walter Whiteley
Combinatorial Characterization of the Assur Graphs from Engineering
null
null
null
null
math.CO math.MG
null
We introduce the idea of Assur graphs, a concept originally developed and exclusively employed in the literature of the kinematics community. The paper translates the terminology, questions, methods and conjectures from the kinematics terminology for one degree of freedom linkages to the terminology of Assur graphs as graphs with special properties in rigidity theory. Exploiting recent works in combinatorial rigidity theory we provide mathematical characterizations of these graphs derived from minimal linkages. With these characterizations, we confirm a series of conjectures posed by Offer Shai, and offer techniques and algorithms to be exploited further in future work.
[ { "version": "v1", "created": "Wed, 16 Jan 2008 16:05:03 GMT" } ]
2009-12-06T00:00:00
[ [ "Servatius", "Brigitte", "" ], [ "Shai", "Offer", "" ], [ "Whiteley", "Walter", "" ] ]
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801.2526
Cristian Favio Coletti
Cristian F. Coletti, Pablo A. Ferrari and Leandro P.R. Pimentel
The variance of the shock in the HAD process
null
null
null
null
math.PR
null
We consider the Hammersley-Aldous-Diaconis (HAD) process with sinks and sources such that there is a microscopic shock at every time $t$; denote $Z(t)$ its position. We show that the mean and variance of $Z(t)$ are linear functions of $t$ and compute explicitely the respective constants in function of the left and right densities. Furthermore, we describe the dependence of $Z(t)$ on the initial configuration in the scale $\sqrt t$ and, as a corollary, prove a central limit theorem.
[ { "version": "v1", "created": "Wed, 16 Jan 2008 16:08:17 GMT" } ]
2008-01-17T00:00:00
[ [ "Coletti", "Cristian F.", "" ], [ "Ferrari", "Pablo A.", "" ], [ "Pimentel", "Leandro P. R.", "" ] ]
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801.2527
Vladimir Burdyuzha
V. Burdyuzha, O. Lalakulich, Yu. Ponomarev, G. Vereshkov
Familon Model of Dark Matter
12 pages
Astron.Astrophys.Trans.23:453-461,2004
10.1080/10556790412331312395
null
hep-ph
null
If the next fundamental level of matter occurs (preons) then dark matter must consist of familons containing a "hot" component from massless particles and a "cold" component from massive particles. During evolution of the Universe this dark matter was undergone to late-time relativistic phase transitions temperatures of which were different. Fluctuations created by these phase transitions have had a fractal character. In the result the structurization of dark matter (and therefore the baryon subsystem) has taken place and in the Universe some characteristic scales which have printed this phenomenon arise naturally. Familons are collective excitations of nonperturbative preon condensates which could be produced during more early relativistic phase transition. For structurization of dark matter (and baryon component) three generations of particles are necessary. The first generation of particles has produced the observed baryon world. The second and third generations have produced dark matter from particles which have appeared when symmetry among generations was spontaneously broken.
[ { "version": "v1", "created": "Wed, 16 Jan 2008 16:25:48 GMT" } ]
2009-11-13T00:00:00
[ [ "Burdyuzha", "V.", "" ], [ "Lalakulich", "O.", "" ], [ "Ponomarev", "Yu.", "" ], [ "Vereshkov", "G.", "" ] ]
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801.2528
Pavel Altukhov
Pavel Altukhov and Evgenii Kuzminov
Direct evidence of the self-compression of injected electron-hole plasma in silicon
3 pages, 2 figures, published in Physica Status Solidi (b)
phys. stat. sol. (b), 2008, v. 245, No. 6, p.p. 1181-1183
10.1002/pssb.200743504
null
cond-mat.mtrl-sci
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A surface distribution of the electroluminescence intensity of silicon p-n light emitting diodes is obtained under space scanning experiments at room temperature. An emitting surface of the diodes, represented by a few small bright emitting dots and a weakly emitting area outside the dots, serves as a direct evidence of the self-compression of injected electron-hole plasma in silicon. The plasma self-compression explains concentration of injected carriers into one or a few strongly emitting plasma drops.
[ { "version": "v1", "created": "Wed, 16 Jan 2008 16:21:38 GMT" }, { "version": "v2", "created": "Wed, 23 Apr 2008 22:31:39 GMT" }, { "version": "v3", "created": "Thu, 12 Jun 2008 21:08:26 GMT" } ]
2008-06-13T00:00:00
[ [ "Altukhov", "Pavel", "" ], [ "Kuzminov", "Evgenii", "" ] ]
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801.2529
Nuno C. Santos
N. C. Santos, C. Melo, D. J. James, J. F. Gameiro, J. Bouvier, J. I. Gomes
Chemical abundances in six nearby star-forming regions: implications for galactic evolution and planet searches around very young stars
10 pages, 5 figures, accepted for publication in A&A
null
10.1051/0004-6361:20079083
null
astro-ph
null
In this paper we present a study of chemical abundances in six star-forming regions. Stellar parameters and metallicities are derived using high-resolution, high S/N spectra of weak-line T-Tauri stars in each region. The results show that nearby star-forming regions have a very small abundance dispersion (only 0.033dex in [Fe/H]). The average metallicity found is slightly below that of the Sun, although compatible with solar once the errors are taken into account. The derived abundances for Si and Ni show that the observed stars have the abundances typical of Galactic thin disk stars of the same metallicity. The impact of these observations is briefly discussed in the context of the Galactic chemical evolution, local inter-stellar medium abundances, and in the origin of metal-rich stars in the solar neighbourhood (namely, stars more likely to harbour planets). The implication for future planet-search programmes around very young, nearby stars is also discussed.
[ { "version": "v1", "created": "Wed, 16 Jan 2008 16:25:22 GMT" } ]
2009-11-13T00:00:00
[ [ "Santos", "N. C.", "" ], [ "Melo", "C.", "" ], [ "James", "D. J.", "" ], [ "Gameiro", "J. F.", "" ], [ "Bouvier", "J.", "" ], [ "Gomes", "J. I.", "" ] ]
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801.253
Jerome Buzzi
Jerome Buzzi (LM-Orsay, CMLS-EcolePolytechnique)
Une nouvelle analyse des mesures maximisant l'entropie des diff\'eomorphismes d'Anosov de surfaces
null
null
null
null
math.DS
null
This note illustrates the strategy of our paper on piecewise affine surface homeomorphisms by giving a new proof of the finite multiplicity of the maximum entropy measure of Anosov diffeomorphisms (here on surfaces). This approach avoids the explicit construction of Markov partitions and will be applied elsewhere to some non-uniformly hyperbolic diffeomorphisms.
[ { "version": "v1", "created": "Wed, 16 Jan 2008 16:39:08 GMT" } ]
2008-01-17T00:00:00
[ [ "Buzzi", "Jerome", "", "LM-Orsay, CMLS-EcolePolytechnique" ] ]
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801.2531
William Arveson
William Arveson
Quantum channels that preserve entanglement
14 pages, links to references are now fixed
null
null
null
math.OA math.FA quant-ph
null
Let M and N be full matrix algebras. A unital completely positive (UCP) map \phi:M\to N is said to preserve entanglement if its inflation \phi\otimes \id_N : M\otimes N\to N\otimes N has the following property: for every maximally entangled pure state \rho of N\otimes N, \rho\circ(\phi\otimes \id_N) is an entangled state of M\otimes N. We show that there is a dichotomy in that every UCP map that is not entanglement breaking in the sense of Horodecki-Shor-Ruskai must preserve entanglement, and that entanglement preserving maps of every possible rank exist in abundance. We also show that with probability 1, {\em all} UCP maps of relatively small rank preserve entanglement, but that this is not so for UCP maps of maximum rank.
[ { "version": "v1", "created": "Wed, 16 Jan 2008 16:40:02 GMT" }, { "version": "v2", "created": "Thu, 17 Jan 2008 17:02:20 GMT" } ]
2008-01-17T00:00:00
[ [ "Arveson", "William", "" ] ]
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801.2532
Costanza Argiroffi
C. Argiroffi (1 and 2), G. Micela (2), A. Maggio (2) ((1) Dip. di Scienze Fisiche ed Astronomiche, Universita di Palermo, Italy, (2) INAF - Osservatorio Astronomico di Palermo, Italy)
Simbol-X capability of detecting the non-thermal emission of stellar flares
2 pages, 2 postscript figures, proceedings of the workshop "Simbol-X: the hard X-ray universe in focus", to be published in "Memorie of the Italian Astronomical Society"
null
null
null
astro-ph
null
We investigate the capability of detecting, with Simbol-X, non-thermal emission during stellar flares, and distinguishing it from hot thermal emission. We find that flare non-thermal emission is detectable when at least ~20 cts are detected with the CZT detector in the 20-80 keV band. Therefore Simbol-X will detect the non-thermal emission from some of the X-ray brightest nearby stars, whether the thermal vs. non-thermal relation, derived for solar flares, holds.
[ { "version": "v1", "created": "Wed, 16 Jan 2008 16:45:35 GMT" } ]
2008-01-17T00:00:00
[ [ "Argiroffi", "C.", "", "1 and 2" ], [ "Micela", "G.", "" ], [ "Maggio", "A.", "" ] ]
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801.2533
Shinichiro Seki
S. Seki, Y. Yamasaki, M. Soda, M. Matsuura, K. Hirota, and Y. Tokura
Correlation between spin helicity and electric polarization vector in quantum-spin chain magnet LiCu$_2$O$_2$
5 pages, 3 figures
null
10.1103/PhysRevLett.100.127201
null
cond-mat.str-el
null
Measurements of polarized neutron scattering were performed on a $S=1/2$ chain multiferroic LiCu$_2$O$_2$. In the ferroelectric ground state with the spontaneous polarization along the c-axis, the existence of transverse spiral spin component in the $bc$-plane was confirmed. When the direction of electric polarization is reversed, the vector spin chirality as defined by ${\bf C}_{ij} = {\bf S}_i \times {\bf S}_j$ ($i$ and $j$ being the neighboring spin sites) is observed to be reversed, indicating that the spin-current model or the inverse Dzyaloshinskii-Moriya mechanism is applicable even to this $e_{\mathrm{g}}$-electron quantum-spin system. Differential scattering intensity of polarized neutrons shows a large discrepancy from that expected for the classical-spin $bc$-cycloidal structure, implying the effect of large quantum fluctuation.
[ { "version": "v1", "created": "Wed, 16 Jan 2008 16:46:00 GMT" } ]
2009-11-13T00:00:00
[ [ "Seki", "S.", "" ], [ "Yamasaki", "Y.", "" ], [ "Soda", "M.", "" ], [ "Matsuura", "M.", "" ], [ "Hirota", "K.", "" ], [ "Tokura", "Y.", "" ] ]
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801.2534
Nicolas Lehner
N. Lehner, J.C. Howk, F.P. Keenan, J.V. Smoker
Metallicity and Physical Conditions in the Magellanic Bridge
Accepted for publication in the ApJ
null
10.1086/529574
null
astro-ph
null
We present a new analysis of the diffuse gas in the Magellanic Bridge (RA>3h) based on HST/STIS E140M and FUSE spectra of 2 early-type stars lying within the Bridge and a QSO behind it. We derive the column densities of HI (from Ly\alpha), NI, OI, ArI, SiII, SII, and FeII of the gas in the Bridge. Using the atomic species, we determine the first gas-phase metallicity of the Magellanic Bridge, [Z/H]=-1.02+/-0.07 toward one sightline, and -1.7<[Z/H]<-0.9 toward the other one, a factor 2 or more smaller than the present-day SMC metallicity. Using the metallicity and N(HI), we show that the Bridge gas along our three lines of sight is ~70-90% ionized, despite high HI columns, logN(HI)=19.6-20.1. Possible sources for the ongoing ionization are certainly the hot stars within the Bridge, hot gas (revealed by OVI absorption), and leaking photons from the SMC and LMC. From the analysis of CII*, we deduce that the overall density of the Bridge must be low (<0.03-0.1 cm^-3). We argue that our findings combined with other recent observational results should motivate new models of the evolution of the SMC-LMC-Galaxy system.
[ { "version": "v1", "created": "Wed, 16 Jan 2008 19:07:47 GMT" } ]
2009-11-13T00:00:00
[ [ "Lehner", "N.", "" ], [ "Howk", "J. C.", "" ], [ "Keenan", "F. P.", "" ], [ "Smoker", "J. V.", "" ] ]
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801.2535
Fu-Jiun Jiang
Fu-Jiun Jiang and Brian C. Tiburzi
Chiral Corrections to Hyperon Axial Form Factors
23 pages, 3 figures, typos corrected and a new NLO prediction added
Phys.Rev.D77:094506,2008
10.1103/PhysRevD.77.094506
UMD-40762-405
hep-lat hep-ph
null
We study the complete set of flavor changing hyperon axial current matrix elements at small momentum transfer. Using partially quenched heavy baryon chiral perturbation theory, we derive the chiral and momentum behavior of the axial and induced pseudoscalar form factors. The meson pole contributions to the latter posses a striking signal for chiral physics. We argue that the study of hyperon axial matrix elements enables a systematic lattice investigation of the efficacy of three flavor chiral expansions in the baryon sector. This can be achieved by considering chiral corrections to SU(3) symmetry predictions, and their partially quenched generalizations. In particular, despite the presence of eight unknown low-energy constants, we are able to make next-to-leading order symmetry breaking predictions for two linear combinations of axial charges.
[ { "version": "v1", "created": "Wed, 16 Jan 2008 16:52:01 GMT" }, { "version": "v2", "created": "Mon, 17 Mar 2008 07:29:12 GMT" } ]
2008-11-26T00:00:00
[ [ "Jiang", "Fu-Jiun", "" ], [ "Tiburzi", "Brian C.", "" ] ]
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801.2536
Wei Li
Wei Li
Non-Supersymmetric Attractors in Symmetric Coset Spaces
26 pages, 4 figures, contribution to the Proceedings of the School on Attractor Mechanism 2007 (SAM2007), 18-22 June 2007, INFN-LNF, Frascati, Italy; v2: reference added
null
null
null
hep-th
null
We present a method of constructing generic single-centered and multi-centered extremal black hole solutions in a large class of 4D N=2 supergravities coupled to vector-multiplets with cubic prepotentials. The method is applicable to models for which the 3D moduli spaces obtained via c*-map are symmetric coset spaces. The attractor solutions are generated by certain nilpotent elements in the coset algebra. We present explicit computations in 4D N=2 supergravity coupled to one vector-multiplet, whose 3D moduli space is the symmetric coset space G_{2(2)}/SL(2,R)^2. The non-supersymmetric multi-centered black holes in this model are found to lack the intricate moduli space of bound configurations that are typical of the supersymmetric case.
[ { "version": "v1", "created": "Wed, 16 Jan 2008 20:56:59 GMT" }, { "version": "v2", "created": "Thu, 17 Jan 2008 20:56:42 GMT" } ]
2008-01-17T00:00:00
[ [ "Li", "Wei", "" ] ]
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801.2537
Priscilla Chapman Frisch
P. C. Frisch
Multi-Cycle HST Treasury Program for STIS: Mapping the Galactic Environment of the Sun
This note was submitted Nov. 30, 2007 to the Space Telescope Science Institute in response to a solicitation for white papers commenting on the possibility of instituting multi-cycle treasury programs
null
null
null
astro-ph
null
Interstellar clouds form the cosmic "ecosystem" through which the Sun moves. Understanding the physical properties of nearby interstellar material, in sufficient detail to evaluate historical variations in the solar galactic environment, requires a survey of ultraviolet interstellar absorption lines towards stars within 20 pc with the STIS spectrometer. A complete survey would yield ionization, temperature, density and velocity for nearby interstellar clouds, and would require a large number of Hubble Space Telescope orbits spaced over several cycles. This note was submitted as a "white paper" to the Space Telescope Science Institute in support of multi-cycle treasury programs.
[ { "version": "v1", "created": "Wed, 16 Jan 2008 17:33:09 GMT" } ]
2008-01-17T00:00:00
[ [ "Frisch", "P. C.", "" ] ]
[ -0.065165855, -0.040791478, 0.1027465016, -0.009178781, 0.0225316379, 0.0403726734, 0.0698006153, 0.0310752317, -0.0029089404, -0.0336718149, 0.0020120027, -0.0316894762, -0.0631555915, -0.0749379396, 0.0884513333, 0.0709732622, -0.0235786475, 0.0619829446, -0.054974962, 0.1049242839, 0.019767534, -0.0183017198, -0.0992285535, 0.081303753, -0.0955430791, -0.1127419472, -0.0493071526, 0.0294558592, 0.0850450695, -0.0562872142, 0.0389208198, -0.0546678379, -0.0787350908, -0.0907407925, -0.0532718264, 0.2113004178, -0.0363242403, 0.1579169035, -0.0325829275, 0.0465151295, -0.0153282145, 0.0001417825, -0.0009423083, 0.0387253799, -0.0023540256, 0.007294164, -0.0051094047, -0.084821701, 0.0300421827, 0.0503681228, -0.0364359207, 0.0327504463, -0.080354467, -0.0785675719, -0.0493909121, -0.0715316683, -0.0692422092, 0.0190416072, -0.0772273988, -0.080354467, -0.0015705138, -0.0223222356, -0.0820296779, -0.0054514278, 0.003425465, 0.0995635912, 0.0729835182, 0.0660034567, -0.0139601221, 0.0084877545, -0.1140821204, 0.0416290835, -0.0356262326, -0.0193208102, 0.0596376434, 0.0042857574, -0.0825322419, -0.0457892008, 0.0510102883, -0.0598610044, 0.0556729697, 0.0381669737, 0.0362683982, 0.0249606986, -0.0608661324, -0.0274595618, 0.0180783588, 0.0366592817, -0.0431926176, -0.0253097024, -0.0119149648, 0.0929744169, -0.0374131277, -0.0366872028, 0.0800194219, -0.1777961254, -0.0048616128, -0.0720342323, 0.0558404885, 0.0078106886, 0.0185948834, -0.1028023437, -0.0595818013, -0.1268695891, 0.0600285269, 0.0138554219, 0.0049732937, 0.1021880955, -0.0492792316, -0.0153282145, -0.0811920688, 0.0160681009, -0.0496701151, 0.092025131, -0.0346490256, 0.0400934704, -0.1704251766, 0.027333919, -0.0092067011, -0.0207028612, 0.0340068601, -0.0093114013, 0.0349840671, 0.0691863671, 0.0571806617, -0.0789026096, 0.0117055625, -0.1106200069, -0.0121871866, 0.0250444598, 0.1174883917, -0.0521550179, -0.0220430326, -0.0203259382, 0.0157190971, -0.0652216896, 0.014260265, -0.0386416204, 0.0154817756, -0.04104276, 0.0288695339, -0.0203538593, 0.0923601687, 0.053215988, 0.0637698397, -0.0097302049, -0.0304330662, 0.1190519258, -0.0070324116, 0.0892889425, -0.0184971616, -0.0321641229, 0.0713083073, -0.0190555677, 0.0499213971, -0.0390604213, -0.027110558, 0.0423829332, -0.0454541594, -0.0131574152, -0.0208703838, 0.0610894971, -0.0102467295, -0.0133598372, 0.0017589754, 0.0220151134, 0.0254213829, 0.030656429, -0.1697550863, 0.0318290778, -0.0494467542, -0.1377026439, -0.0043171677, 0.0172686707, -0.0160681009, 0.033476375, -0.0431647003, -0.0844308212, -0.0373014472, -0.0814712718, -0.0396188274, 0.0439743847, 0.006589178, -0.1118485034, 0.0086133955, -0.0324154049, 0.0124314893, 0.0374689698, 0.0713641495, 0.001825286, -0.000565385, 0.0232994445, 0.0457333624, 0.1205037758, -0.1006804034, -0.1087772772, 0.0002637154, -0.0177014358, -0.0282273684, 0.0494188331, 0.053215988, 0.0535789505, -0.0458171219, 0.0041426662, -0.0799635798, -0.0373572893, 0.0741003305, 0.0443373471, -0.0976091772, 0.0564826541, 0.0436672643, 0.066170983, -0.1164832637, 0.0641048849, -0.0657242537, 0.0165567044, -0.0577390678, 0.0664501861, 0.128321439, 0.1167066246, -0.065668419, 0.0359612741, 0.0640490428, 0.1564650536, 0.0621504635, 0.1013504863, -0.0239555705, 0.0310752317, 0.0551704057, -0.0776182786, 0.0487766676, 0.0041321963, -0.0765573084, -0.1054268479, -0.0360450372, 0.0362404771, -0.005458408, -0.0568176992, -0.0255051441, -0.0986143053, -0.0687396452, 0.0829231292, 0.0233413242, 0.0245000143, -0.0421874896, 0.0495584346, -0.0224059969, -0.0914667249, 0.0964365229, -0.0086133955, 0.0480786636, -0.0095487237, -0.033951018, -0.0882838145, -0.014008983, 0.0099675274 ]
801.2538
Oleg Tsupko
G. S. Bisnovatyi-Kogan and O. Yu. Tsupko
Dynamic stabilization of non-spherical bodies against unlimited collapse
MNRAS, accepted, 7 pages, 9 figures
null
10.1111/j.1365-2966.2008.12983.x
null
astro-ph
null
We solve equations, describing in a simplified way the newtonian dynamics of a selfgravitating nonrotating spheroidal body after loss of stability. We find that contraction to a singularity happens only in a pure spherical collapse, and deviations from the spherical symmetry stop the contraction by the stabilising action of nonlinear nonspherical oscillations. A real collapse happens after damping of the oscillations due to energy losses, shock wave formation or viscosity. Detailed analysis of the nonlinear oscillations is performed using a Poincar\'{e} map construction. Regions of regular and chaotic oscillations are localized on this map.
[ { "version": "v1", "created": "Wed, 16 Jan 2008 17:16:39 GMT" } ]
2009-11-13T00:00:00
[ [ "Bisnovatyi-Kogan", "G. S.", "" ], [ "Tsupko", "O. Yu.", "" ] ]
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801.2539
Dan Hooper
Dan Hooper, Tilman Plehn and Alberto Vallinotto
Neutralino Dark Matter and Trilepton Searches in the MSSM
13 pages, 14 figures
Phys.Rev.D77:095014,2008
10.1103/PhysRevD.77.095014
FERMILAB-PUB-07-666-A
hep-ph astro-ph
null
Searches for supersymmetry are among the most exciting physics goals at Run II of the Tevatron. In particular, in supersymmetric models with light charginos, neutralinos and sleptons, associated chargino--neutralino production can potentially be observed as multi-lepton events with missing energy. We discuss how, in the generic TeV-scale MSSM, the prospects for these chargino-neutralino searches are impacted by cosmological considerations, namely the neutralino relic abundance and direct detection limits. We also discuss what an observation of chargino-neutralino production at the Tevatron would imply for the prospects of future direct dark matter searches without assuming specific patterns of supersymmetry breaking.
[ { "version": "v1", "created": "Wed, 16 Jan 2008 17:17:31 GMT" } ]
2008-11-26T00:00:00
[ [ "Hooper", "Dan", "" ], [ "Plehn", "Tilman", "" ], [ "Vallinotto", "Alberto", "" ] ]
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801.254
Marco Pirrone
Marco Pirrone
Giants on Deformed Backgrounds Part II: The Gauge Field Fluctuations
LaTex, 20 pages, 3 figures, uses JHEP3
JHEP 0803:034,2008
10.1088/1126-6708/2008/03/034
FT-08-1
hep-th
null
We study the full bosonic spectrum around giant and dual giant graviton probes in exactly marginally deformed backgrounds. Considering supersymmetric and non-supersymmetric three-parameter deformations of AdS_5 X S^5, we perform a detailed analysis of small fluctuations for both the expanded D3-brane configurations. In particular, we enhance the scalar spectra of frequencies found in our previous paper hep-th/0609173 with the important contributions brought by the gauge field fluctuations. The giant graviton case exhibits a non-trivial coupling between scalar and vector modes driven by the deformation, whose resolution yields to a universal correction of the undeformed spectrum. On the other hand, dual giant vibrations turn out to be completely decoupled. From our results one can also easily read the gauge field fluctuations in the undeformed (dual) giant graviton scenario.
[ { "version": "v1", "created": "Wed, 16 Jan 2008 17:21:16 GMT" } ]
2009-12-15T00:00:00
[ [ "Pirrone", "Marco", "" ] ]
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801.2541
Andrey Leznov
A. N. Leznov
Two Poisson structures invariant with respect to discrete transformation in the case of arbitrary semi-simple algebras
25 pages, no figures
null
null
null
hep-lat
null
Two Poisson structures invariant with respect to discrete transformation of the Maximal root in the case of arbitrary semi-simple algebras are presented in explicit form. Thus the problem of construction of equations of n-wave hierarchy in the case of arbitrary semi simple algebra is solved finally.
[ { "version": "v1", "created": "Wed, 16 Jan 2008 17:38:13 GMT" } ]
2008-01-17T00:00:00
[ [ "Leznov", "A. N.", "" ] ]
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801.2542
Ivan K. Kostov
Ivan Kostov, Didina Serban, Dmytro Volin
Functional BES equation
References added
JHEP 0808:101,2008
10.1088/1126-6708/2008/08/101
SPhT-t08/007
hep-th
null
We give a realization of the Beisert, Eden and Staudacher equation for the planar N=4 supersymetric gauge theory whichseems to be particularly useful to study the strong coupling limit. We use a linearized version of the BES equation as two coupled equations involving an auxiliary density function. We write these equations in terms of the resolvents and we transform them into to a system of functional, instead of integral, equations. We solve the functional equations perturbatively in the strong coupling limit and reproduce the recursive solution obtained by Basso, Korchemsky and Kotanski. The coefficients of the strong coupling expansion are fixed by the analyticity properties obeyed by the resolvents.
[ { "version": "v1", "created": "Wed, 16 Jan 2008 19:52:59 GMT" }, { "version": "v2", "created": "Thu, 17 Jan 2008 15:44:39 GMT" } ]
2009-12-15T00:00:00
[ [ "Kostov", "Ivan", "" ], [ "Serban", "Didina", "" ], [ "Volin", "Dmytro", "" ] ]
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801.2543
Francesco Dalla Piazza
Sergio L. Cacciatori, Francesco Dalla Piazza, and Bert van Geemen
Modular Forms and Three Loop Superstring Amplitudes
25 pages
Nucl.Phys.B800:565-590,2008
10.1016/j.nuclphysb.2008.03.007
null
hep-th
null
We study a proposal of D'Hoker and Phong for the chiral superstring measure for genus three. A minor modification of the constraints they impose on certain Siegel modular forms leads to a unique solution. We reduce the problem of finding these modular forms, which depend on an even spin structure, to finding a modular form of weight 8 on a certain subgroup of the modular group. An explicit formula for this form, as a polynomial in the even theta constants, is given. We checked that our result is consistent with the vanishing of the cosmological constant. We also verified a conjecture of D'Hoker and Phong on modular forms in genus 3 and 4 using results of Igusa.
[ { "version": "v1", "created": "Wed, 16 Jan 2008 17:46:18 GMT" }, { "version": "v2", "created": "Thu, 3 Apr 2008 14:33:25 GMT" } ]
2008-11-26T00:00:00
[ [ "Cacciatori", "Sergio L.", "" ], [ "Piazza", "Francesco Dalla", "" ], [ "van Geemen", "Bert", "" ] ]
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801.2544
Stefano Forte
Simone Marzani, Richard D.Ball, Vittorio Del Duca, Stefano Forte and Alessandro Vicini
Higgs production via gluon-gluon fusion with finite top mass beyond next-to-leading order
20 pages, 5 figures, latex with epsfig
Nucl.Phys.B800:127-145,2008
10.1016/j.nuclphysb.2008.03.016
IFUM-911-FT, Edinburgh 2008/1, CERN-PH-TH/2008-009
hep-ph
null
We present a computation of the cross section for inclusive Higgs production in gluon-gluon fusion for finite values of the top mass in perturbative QCD to all orders in the limit of high partonic center-of-mass energy. We show that at NLO the high energy contribution accounts for most of the difference between the result found with finite top mass and that obtained in the limit of infinite top mass. We use our result to improve the known NNLO order result obtained with infinite top mass. We estimate the effect of the high energy NNLO top mass dependence on the K factor to be of the order of a few per cent.
[ { "version": "v1", "created": "Wed, 16 Jan 2008 18:06:49 GMT" } ]
2008-11-26T00:00:00
[ [ "Marzani", "Simone", "" ], [ "Ball", "Richard D.", "" ], [ "Del Duca", "Vittorio", "" ], [ "Forte", "Stefano", "" ], [ "Vicini", "Alessandro", "" ] ]
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801.2545
Ernest Ma
Ernest Ma (UC Riverside)
Supersymmetric U(1) Gauge Realization of the Dark Scalar Doublet Model of Radiative Neutrino Mass
8 pages, 3 figures
Mod.Phys.Lett.A23:721-725,2008
10.1142/S0217732308026753
UCRHEP-T444
hep-ph
null
Adding a second scalar doublet (eta^+,eta^0) and three neutral singlet fermions N_{1,2,3} to the Standard Model of particle interactions with a new Z_2 symmetry, it has been shown that Re(eta^0) or Im(eta^0) is a good dark-matter candidate and seesaw neutrino masses are generated radiatively. A supersymmetric U(1) gauge extension of this new idea is proposed, which enforces the usual R parity of the Minimal Supersymmetric Standard Model, and allows this new Z_2 symmetry to emerge as a discrete remnant.
[ { "version": "v1", "created": "Wed, 16 Jan 2008 18:07:03 GMT" }, { "version": "v2", "created": "Mon, 21 Jan 2008 20:33:28 GMT" } ]
2008-11-26T00:00:00
[ [ "Ma", "Ernest", "", "UC Riverside" ] ]
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801.2546
Alexander Kordyuk
A. A. Kordyuk, S. V. Borisenko, V. B. Zabolotnyy, R. Schuster, D. S. Inosov, R. Follath, A. Varykhalov, L. Patthey, H. Berger
Non-monotonic pseudo-gap in high-Tc cuprates
null
Phys. Rev. B 79, 020504(R) (2009)
10.1103/PhysRevB.79.020504
null
cond-mat.supr-con cond-mat.str-el
null
The mechanism of high temperature superconductivity is not resolved for so long because the normal state of cuprates is not yet understood. Here we show that the normal state pseudo-gap exhibits an unexpected non-monotonic temperature dependence, which rules out the possibility to describe it by a single mechanism such as superconducting phase fluctuations. Moreover, this behaviour, being remarkably similar to the behaviour of the charge ordering gap in the transition-metal dichalcogenides, completes the correspondence between these two classes of compounds: the cuprates in the PG state and the dichalcogenides in the incommensurate charge ordering state reveal virtually identical spectra of one-particle excitations as function of energy, momentum and temperature. These results suggest that the normal state pseudo-gap, which was considered to be very peculiar to cuprates, seems to be a general complex phenomenon for 2D metals. This may not only help to clarify the normal state electronic structure of 2D metals but also provide new insight into electronic properties of 2D solids where the metal-insulator and metal-superconductor transitions are considered on similar basis as instabilities of particle-hole and particle-particle interaction, respectively.
[ { "version": "v1", "created": "Wed, 16 Jan 2008 18:41:39 GMT" }, { "version": "v2", "created": "Thu, 17 Jan 2008 11:53:07 GMT" } ]
2009-01-15T00:00:00
[ [ "Kordyuk", "A. A.", "" ], [ "Borisenko", "S. V.", "" ], [ "Zabolotnyy", "V. B.", "" ], [ "Schuster", "R.", "" ], [ "Inosov", "D. S.", "" ], [ "Follath", "R.", "" ], [ "Varykhalov", "A.", "" ], [ "Patthey", "L.", "" ], [ "Berger", "H.", "" ] ]
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801.2547
Francesco Calura
F. Calura (1), G. L. Lanfranchi (2), F. Matteucci (1,3) - ((1) INAF-Oss. Astronomico di Trieste, Italy; (2) Nucleo de Astrofisica Teorica-UNICSUL, Brazil; (3) Dip. di Astronomia, Universita' di Trieste, Italy)
The evolution of the photometric properties of Local Group dwarf spheroidal galaxies
13 pages, Astronomy & Astrophysics, accepted
null
10.1051/0004-6361:20078465
null
astro-ph
null
We investigate the present-day photometric properties of the dwarf spheroidal galaxies in the Local Group. From the analysis of their integrated colours, we consider a possible link between dwarf spheroidals and giant ellipticals. From the analysis of the V vs (B-V) plot, we search for a possible evolutionary link between dwarf spheroidal galaxies (dSphs) and dwarf irregular galaxies (dIrrs). By means of chemical evolution models combined with a spectro-photometric model, we study the evolution of six Local Group dwarf spheroidal galaxies (Carina, Draco, Sagittarius, Sculptor, Sextans and Ursa Minor). The chemical evolution models, which adopt up-to-date nucleosynthesis from low and intermediate mass stars as well as nucleosynthesis and energetic feedback from supernovae type Ia and II, reproduce several observational constraints of these galaxies, such as abundance ratios versus metallicity and the metallicity distributions. The proposed scenario for the evolution of these galaxies is characterised by low star formation rates and high galactic wind efficiencies. Such a scenario allows us to predict integrated colours and magnitudes which agree with observations. Our results strongly suggest that the first few Gyrs of evolution, when the star formation is most active, are crucial to define the luminosities, colours, and other photometric properties as observed today. After the star formation epoch, the galactic wind sweeps away a large fraction of the gas of each galaxy, which then evolves passively. Our results indicate that it is likely that at a certain stage of their evolution, dSphs and dIrrs presented similar photometric properties. However, after that phase, they evolved along different paths, leading them to their currently disparate properties.
[ { "version": "v1", "created": "Wed, 16 Jan 2008 18:13:31 GMT" } ]
2009-11-13T00:00:00
[ [ "Calura", "F.", "" ], [ "Lanfranchi", "G. L.", "" ], [ "Matteucci", "F.", "" ], [ "-", "", "" ] ]
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801.2548
Chakrabarti Amitabha
B. Abdesselam and A. Chakrabarti
A new eight vertex model and higher dimensional, multiparameter generalizations
24 pages, 2 figures, some misprints are corrected
J. Math. Phys. 49, 053301 (2008)
10.1063/1.2918142
CPHT-RR001.01.08
math.QA cond-mat.stat-mech hep-th
null
We study statistical models, specifically transfer matrices corresponding to a multiparameter hierarchy of braid matrices of $(2n)^2\times(2n)^2$ dimensions with $2n^2$ free parameters $(n=1,2,3,...)$. The simplest, $4\times 4$ case is treated in detail. Powerful recursion relations are constructed giving the dependence on the spectral parameter $\theta$ of the eigenvalues of the transfer matrix explicitly at each level of coproduct sequence. A brief study of higher dimensional cases ($n\geq 2$) is presented pointing out features of particular interest. Spin chain Hamiltonians are also briefly presented for the hierarchy. In a long final section basic results are recapitulated with systematic analysis of their contents. Our eight vertex $4\times 4$ case is compared to standard six vertex and eight vertex models.
[ { "version": "v1", "created": "Wed, 16 Jan 2008 19:48:08 GMT" }, { "version": "v2", "created": "Wed, 30 Jan 2008 18:51:43 GMT" }, { "version": "v3", "created": "Tue, 12 Feb 2008 17:31:45 GMT" } ]
2009-11-13T00:00:00
[ [ "Abdesselam", "B.", "" ], [ "Chakrabarti", "A.", "" ] ]
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801.2549
Mario Ponce
Mario Ponce
On the persistence of invariant curves for Fibered Holomorphic Transformations
null
null
10.1007/s00220-009-0805-5
null
math.DS
null
We consider the problem of the persistence of invariant curves for analytical fibered holomorphic transformations. We define a fibered rotation number associated to an invariant curve. We show that an invariant curve with a prescribed fibered rotation number persists under small perturbations on the dynamics provided that the pair of rotation numbers verifies a Brjuno type arithmetical condition.
[ { "version": "v1", "created": "Wed, 16 Jan 2008 18:48:30 GMT" } ]
2015-05-13T00:00:00
[ [ "Ponce", "Mario", "" ] ]
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801.255
Marcos Jardim
Marcos Jardim
Moduli spaces of framed instanton sheaves on projective spaces
This paper has been withdraw. A fully revised version with two new co-authors has been posted: "ADHM construction of perverse instanton sheaves", arXiv:1201.5657
null
null
null
math.AG
null
This paper has been withdraw. A fully revised version with two new co-authors has been posted: "ADHM construction of perverse instanton sheaves", arXiv:1201.5657.
[ { "version": "v1", "created": "Wed, 16 Jan 2008 18:54:44 GMT" }, { "version": "v2", "created": "Tue, 22 Apr 2008 20:41:47 GMT" }, { "version": "v3", "created": "Wed, 5 May 2010 18:50:25 GMT" }, { "version": "v4", "created": "Wed, 19 Sep 2012 16:25:22 GMT" } ]
2012-09-20T00:00:00
[ [ "Jardim", "Marcos", "" ] ]
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801.2551
Francesco Calura
F. Calura (1), A. Pipino (2,3), F. Matteucci (1,3) - ((1) INAF-Oss. Astronomico di Trieste, Italy; (2) Astrophysics, Oxford University, UK; (3) Dip. di Astronomia, Universita' di Trieste, Italy)
Interstellar dust evolution in galaxies of different morphological types
22 pages, to appear on the proceedings of "XIXemes Rencontres de Blois"
null
null
null
astro-ph
null
We study interstellar dust evolution in various environments by means of chemical evolution models for galaxies of different morphological types. We start from the formalism developed by Dwek (1998) to study dust evolution in the solar neighbourhood and extend it to ellipticals and dwarf irregular galaxies, showing how the evolution of the dust production rates and of the dust fractions depend on the galactic star formation history. The observed dust fractions observed in the solar neighbourhood can be reproduced by assuming that dust destruction depends the condensation temperatures T_c of the elements. In elliptical galaxies, type Ia SNe are the major dust factories in the last 10 Gyr. With our models, we successfully reproduce the dust masses observed in local ellipticals (~10^6 M_sun) by means of recent FIR and SCUBA observations. We show that dust is helpful in solving the iron discrepancy observed in the hot gaseous halos surrounding local ellipticals. In dwarf irregulars, we show how a precise determination of the dust depletion pattern could be useful to put solid constraints on the dust condensation efficiencies. Our results will be helpful to study the spectral properties of dust grains in local and distant galaxies.
[ { "version": "v1", "created": "Wed, 16 Jan 2008 18:53:10 GMT" } ]
2008-01-17T00:00:00
[ [ "Calura", "F.", "" ], [ "Pipino", "A.", "" ], [ "Matteucci", "F.", "" ], [ "-", "", "" ] ]
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801.2552
Joseph Schechter
Amir H. Fariborz, Renata Jora and Joseph Schechter
Note on a sigma model connection with instanton dynamics
reference added, minor typos corrected
Phys.Rev.D77:094004,2008
10.1103/PhysRevD.77.094004
SU-4252-872
hep-ph
null
It is well known that the instanton approach to QCD generates an effective term which looks like a three flavor determinant of quark bilinears. This has the right behavior to explain the unusual mass and mixing of the $\eta(958)$ meson, as is often simply illustrated with the aid of a linear SU(3) sigma model. It is less well known that the instanton analysis generates another term which has the same transformation property but does not have a simple interpretation in terms of this usual linear sigma model. Here we point out that this term has an interpretation in a generalized linear sigma model containing two chiral nonets. The second chiral nonet is taken to correspond to mesons having two quarks and two antiquarks in their makeup. The generalized model seems to be useful for learning about the spectrum of low lying scalar mesons which have been emerging in the last few years. The physics of the new term is shown to be related to the properties of an "excited" $\eta'$ state present in the generalized model and for which there are some experimental candidates.
[ { "version": "v1", "created": "Wed, 16 Jan 2008 19:04:42 GMT" }, { "version": "v2", "created": "Fri, 1 Feb 2008 20:54:42 GMT" } ]
2008-11-26T00:00:00
[ [ "Fariborz", "Amir H.", "" ], [ "Jora", "Renata", "" ], [ "Schechter", "Joseph", "" ] ]
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801.2553
Maia Fraser
Y. Eliashberg, M. Fraser
Topologically Trivial Legendrian Knots
Various typographical errors corrected and introduction shortened
null
null
null
math.GT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The paper deals with topologically trivial Legendrian knots in tight and overtwisted contact 3-manifolds. The first part contains a thorough exposition of the proof of the classification of topologically trivial Legendrian knots (i.e. Legendrian knots bounding embedded 2-disks) in tight contact 3-manifolds. This part was essentially written more than 10 years ago, but only a short version, without the detailed proofs, was published (in CRM Proc. Lecture Notes, Vol. 15, 1998). That paper also briefly discussed the overtwisted case. The final part of the present paper contains a more systematic discussion of Legendrian knots in overtwisted contact manifolds, and in particular, gives the coarse classification (i.e. classification up to a global contactomorphism) of topologically trivial Legendrian knots in overtwisted contact S^3.
[ { "version": "v1", "created": "Wed, 16 Jan 2008 19:07:07 GMT" }, { "version": "v2", "created": "Sun, 16 Nov 2008 17:08:21 GMT" } ]
2008-11-16T00:00:00
[ [ "Eliashberg", "Y.", "" ], [ "Fraser", "M.", "" ] ]
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801.2554
Frank Sottile
Frederic Bihan and Frank Sottile
Betti number bounds for fewnomial hypersurfaces via stratified Morse theory
8 pages, 2 figures
null
null
null
math.AG math.AT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We use stratified Morse theory for a manifold with corners to give a new bound for the sum of the Betti numbers of a hypersurface in R^n_> defined by a polynomial with n+l+1 terms.
[ { "version": "v1", "created": "Wed, 16 Jan 2008 19:23:07 GMT" }, { "version": "v2", "created": "Tue, 3 Feb 2009 03:06:21 GMT" } ]
2009-02-03T00:00:00
[ [ "Bihan", "Frederic", "" ], [ "Sottile", "Frank", "" ] ]
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801.2555
Ping Ma
Ping Ma and Wenxuan Zhong
Penalized Clustering of Large Scale Functional Data with Multiple Covariates
null
null
null
null
stat.ME stat.CO
null
In this article, we propose a penalized clustering method for large scale data with multiple covariates through a functional data approach. In the proposed method, responses and covariates are linked together through nonparametric multivariate functions (fixed effects), which have great flexibility in modeling a variety of function features, such as jump points, branching, and periodicity. Functional ANOVA is employed to further decompose multivariate functions in a reproducing kernel Hilbert space and provide associated notions of main effect and interaction. Parsimonious random effects are used to capture various correlation structures. The mixed-effect models are nested under a general mixture model, in which the heterogeneity of functional data is characterized. We propose a penalized Henderson's likelihood approach for model-fitting and design a rejection-controlled EM algorithm for the estimation. Our method selects smoothing parameters through generalized cross-validation. Furthermore, the Bayesian confidence intervals are used to measure the clustering uncertainty. Simulation studies and real-data examples are presented to investigate the empirical performance of the proposed method. Open-source code is available in the R package MFDA.
[ { "version": "v1", "created": "Wed, 16 Jan 2008 19:34:50 GMT" } ]
2008-01-17T00:00:00
[ [ "Ma", "Ping", "" ], [ "Zhong", "Wenxuan", "" ] ]
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801.2556
Supriya Jain
D0 Collaboration: V. Abazov, et al
Search for production of single top quarks via $tcg$ and $tug$ flavor-changing neutral current couplings
7 pages, 5 figures; updated (published) version of hep-ex/0702005
Phys.Rev.Lett.99:191802,2007
10.1103/PhysRevLett.99.191802
FERMILAB-PUB-07-031-E
hep-ex
null
We search for the production of single top quarks via flavor-changing neutral current couplings of a gluon to the top quark and a charm ($c$) or up ($u$) quark. We analyze 230 pb$^{-1}$ of lepton + jets data from $\ppbar$ collisions at a center of mass energy of 1.96 TeV collected by the D0 detector at the Fermilab Tevatron Collider. We observe no significant deviation from standard model predictions, and hence set upper limits on the anomalous coupling parameters $\kappacLambda$ and $\kappauLambda$, where $\kappag$ define the strength of $tcg$ and $tug$ couplings, and $\Lambda$ defines the scale of new physics. The limits at 95% C.L. are: $\kappacLambda < 0.15 \rm TeV^{-1}$ and $\kappauLambda < 0.037 \rm TeV^{-1}$.
[ { "version": "v1", "created": "Wed, 16 Jan 2008 19:26:00 GMT" } ]
2010-04-22T00:00:00
[ [ "D0 Collaboration", "", "" ], [ "Abazov", "V.", "" ] ]
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801.2557
Nikolaos Mavromatos
J. Alexandre, Anna Kostouki, and N. E. Mavromatos
Non-renormalization for the Liouville wave function
13 pages Latex, no figures
New J.Phys.10:073029,2008
10.1088/1367-2630/10/7/073029
null
hep-th gr-qc math-ph math.MP
null
Using an exact functional method, within the framework of the gradient expansion for the Liouville effective action, we show that the kinetic term for the Liouville field is not renormalized.
[ { "version": "v1", "created": "Wed, 16 Jan 2008 19:27:05 GMT" } ]
2009-11-19T00:00:00
[ [ "Alexandre", "J.", "" ], [ "Kostouki", "Anna", "" ], [ "Mavromatos", "N. E.", "" ] ]
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801.2558
Daniela Calzetti
D. Calzetti (UMass-Amherst)
Measuring Star Formation in Local and Distant Galaxies
6 pages, 1 figure; to appear in the Proceedings `A Century of Cosmology', San Servolo (Venezia, Italy), August 2007, to be published by `Il Nuovo Cimento'
Nuovo Cim.B122:971-976,2007
10.1393/ncb/i2008-10432-y
null
astro-ph
null
I review measurements of star formation in nearby galaxies in the UV-to-FIR wavelength range, and discuss their impact on SFR determinations in intermediate and high redshift galaxy populations. Existing and upcoming facilities will enable precise cross-calibrations among the various indicators, thus bringing them onto a common scale.
[ { "version": "v1", "created": "Wed, 16 Jan 2008 20:41:29 GMT" } ]
2010-11-11T00:00:00
[ [ "Calzetti", "D.", "", "UMass-Amherst" ] ]
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801.2559
Waldyr A. Rodrigues Jr.
Eduardo A. Notte-Cuello and Waldyr A. Rodrigues Jr
Freud's Identity of Differential Geometry, the Einstein-Hilbert Equations and the Vexatious Problem of the Energy-Momentum Conservation in GR
New references have been added and misprints have been corrected
null
null
null
math-ph math.MP
null
We reveal in a rigorous mathematical way using the theory of differential forms, here viewed as sections of a Clifford bundle over a Lorentzian manifold, the true meaning of Freud's identity of differential geometry discovered in 1939 (as a generalization of results already obtained by Einstein in 1916) and rediscovered in disguised forms by several people. We show moreover that contrary to some claims in the literature there is not a single (mathematical) inconsistency between Freud's identity (which is a decomposition of the Einstein indexed 3-forms in two gauge dependent objects) and the field equations of General Relativity. However, as we show there is an obvious inconsistency in the way that Freud's identity is usually applied in the formulation of energy-momentum "conservation laws" in GR. In order for this paper to be useful for a large class of readers (even those ones making a first contact with the theory of differential forms) all calculations are done with all details (disclosing some of the "tricks of the trade" of the subject).
[ { "version": "v1", "created": "Wed, 16 Jan 2008 19:54:29 GMT" }, { "version": "v2", "created": "Sat, 19 Jan 2008 18:06:27 GMT" }, { "version": "v3", "created": "Wed, 23 Jan 2008 18:05:40 GMT" }, { "version": "v4", "created": "Wed, 5 Mar 2008 16:16:48 GMT" } ]
2008-03-05T00:00:00
[ [ "Notte-Cuello", "Eduardo A.", "" ], [ "Rodrigues", "Waldyr A.", "Jr" ] ]
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801.256
Sean Raymond
Sean N. Raymond (University of Colorado)
Terrestrial Planet Formation in Extra-Solar Planetary Systems
19 pages, 5 figures. To appear in the proceedings of IAU Symposium 249: Exoplanets: Detection, Formation and Dynamics, held in Suzhou, China, Oct 22-26 2007
null
10.1017/S1743921308016645
null
astro-ph
null
Terrestrial planets form in a series of dynamical steps from the solid component of circumstellar disks. First, km-sized planetesimals form likely via a combination of sticky collisions, turbulent concentration of solids, and gravitational collapse from micron-sized dust grains in the thin disk midplane. Second, planetesimals coalesce to form Moon- to Mars-sized protoplanets, also called "planetary embryos". Finally, full-sized terrestrial planets accrete from protoplanets and planetesimals. This final stage of accretion lasts about 10-100 Myr and is strongly affected by gravitational perturbations from any gas giant planets, which are constrained to form more quickly, during the 1-10 Myr lifetime of the gaseous component of the disk. It is during this final stage that the bulk compositions and volatile (e.g., water) contents of terrestrial planets are set, depending on their feeding zones and the amount of radial mixing that occurs. The main factors that influence terrestrial planet formation are the mass and surface density profile of the disk, and the perturbations from giant planets and binary companions if they exist. Simple accretion models predicts that low-mass stars should form small, dry planets in their habitable zones. The migration of a giant planet through a disk of rocky bodies does not completely impede terrestrial planet growth. Rather, "hot Jupiter" systems are likely to also contain exterior, very water-rich Earth-like planets, and also "hot Earths", very close-in rocky planets. Roughly one third of the known systems of extra-solar (giant) planets could allow a terrestrial planet to form in the habitable zone.
[ { "version": "v1", "created": "Wed, 16 Jan 2008 20:03:05 GMT" } ]
2009-11-13T00:00:00
[ [ "Raymond", "Sean N.", "", "University of Colorado" ] ]
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801.2561
Yong Zhang
Yong Zhang (Utah)
Quantum Error Correction Code in the Hamiltonian Formulation
v2, v3: latex, 19 pages, 2 figures
null
null
null
quant-ph cond-mat.other hep-th
null
The Hamiltonian model of quantum error correction code in the literature is often constructed with the help of its stabilizer formalism. But there have been many known examples of nonadditive codes which are beyond the standard quantum error correction theory using the stabilizer formalism. In this paper, we suggest the other type of Hamiltonian formalism for quantum error correction code without involving the stabilizer formalism, and explain it by studying the Shor nine-qubit code and its generalization. In this Hamiltonian formulation, the unitary evolution operator at a specific time is a unitary basis transformation matrix from the product basis to the quantum error correction code. This basis transformation matrix acts as an entangling quantum operator transforming a separate state to an entangled one, and hence the entanglement nature of the quantum error correction code can be explicitly shown up. Furthermore, as it forms a unitary representation of the Artin braid group, the quantum error correction code can be described by a braiding operator. Moreover, as the unitary evolution operator is a solution of the quantum Yang--Baxter equation, the corresponding Hamiltonian model can be explained as an integrable model in the Yang--Baxter theory. On the other hand, we generalize the Shor nine-qubit code and articulate a topic called quantum error correction codes using Greenberger-Horne-Zeilinger states to yield new nonadditive codes and channel-adapted codes.
[ { "version": "v1", "created": "Wed, 16 Jan 2008 20:23:52 GMT" }, { "version": "v2", "created": "Mon, 21 Jan 2008 02:56:25 GMT" }, { "version": "v3", "created": "Mon, 28 Jan 2008 19:26:34 GMT" } ]
2008-01-28T00:00:00
[ [ "Zhang", "Yong", "", "Utah" ] ]
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801.2562
Gian Francesco Giudice
G.F. Giudice
Naturally Speaking: The Naturalness Criterion and Physics at the LHC
22 pages
null
10.1142/9789812779762_0010
null
hep-ph hep-th
null
A non-technical discussion of the naturalness criterion and its implications for new physics searches at the LHC. To be published in the book "LHC Perspectives", edited by G. Kane and A. Pierce.
[ { "version": "v1", "created": "Wed, 16 Jan 2008 20:04:43 GMT" }, { "version": "v2", "created": "Sun, 30 Mar 2008 11:51:24 GMT" } ]
2016-11-23T00:00:00
[ [ "Giudice", "G. F.", "" ] ]
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801.2563
George Smoot Dr
George F. Smoot
CMB Anisotropies: Their Discovery and Utilization
12 pages, 2 figures, `A Century of Cosmology' held at San Servolo, Venice
Nuovo Cim.B122:1339-1351,2007
10.1393/ncb/i2008-10481-2
null
astro-ph
null
This article is a written and modified version of a talk presented at the conference `A Century of Cosmology' held at San Servolo, Venice, Italy, in August 2007. The talk focuses on some of the cosmology history leading to the discovery and exploitation of Cosmic Microwave Background (CMB) Radiation anisotropies. We have made tremendous advances first in the development of the techniques to observe these anisotropies and in observing and interpreting them to extract their contained cosmological information. CMB anisotropies are now a cornerstone in our understanding of the cosmos and our future progress in the field. This is an outcome that Dennis Sciama hoped for and encouraged.
[ { "version": "v1", "created": "Wed, 16 Jan 2008 20:10:32 GMT" } ]
2010-11-11T00:00:00
[ [ "Smoot", "George F.", "" ] ]
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801.2564
Jorge Pullin
Rodolfo Gambini and Jorge Pullin
Modern space-time and undecidability
8 pages, no figures, Revtex, contribution to the volume "Minkowski spacetime: a hundred years later", edited by Vesselin Petkov
Fundamental theories of physics 165, 149 (2010)
null
LSU-REL-011508
gr-qc hep-th quant-ph
null
The picture of space-time that Minkowski created in 1907 has been followed by two important developments in physics not contained in the original picture: general relativity and quantum mechanics. We will argue that the use of concepts of those theories to construct space-time implies conceptual modifications in quantum mechanics. In particular one can construct a viable picture of quantum mechanics without a reduction process that has outcomes equivalent to a picture with a reduction process. One therefore has two theories that are entirely equivalent experimentally but profoundly different in the description of reality they give. This introduces a fundamental level of undecidability in physics of a kind that has not been present before. We discuss some of the implications.
[ { "version": "v1", "created": "Wed, 16 Jan 2008 20:17:33 GMT" } ]
2013-02-22T00:00:00
[ [ "Gambini", "Rodolfo", "" ], [ "Pullin", "Jorge", "" ] ]
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801.2565
Erik Carlsson
Erik Carlsson, Andrei Okounkov
Exts and Vertex Operators
21 pages, 0 figures
Duke Math. J. 161, no. 9 (2012), 1797-1815
10.1215/00127094-1593380
null
math.AG math.RT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The direct product of two Hilbert schemes of the same surface has natural K-theory classes given by the alternating Ext groups between the two ideal sheaves in question, twisted by a line bundle. We express the Chern classes of these virtual bundles in terms of Nakajima operators.
[ { "version": "v1", "created": "Wed, 16 Jan 2008 20:36:56 GMT" }, { "version": "v2", "created": "Tue, 16 Jun 2009 21:02:31 GMT" }, { "version": "v3", "created": "Wed, 8 Nov 2017 08:28:02 GMT" } ]
2019-12-19T00:00:00
[ [ "Carlsson", "Erik", "" ], [ "Okounkov", "Andrei", "" ] ]
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801.2566
Chad M. Topaz
A.J. Leverentz, C.M. Topaz, A.J. Bernoff
Asymptotic dynamics of attractive-repulsive swarms
23 pages, 10 figures; revised version updates the analysis in sec. 2.1 and 2.2, and contains enhanced discussion of the admissible class of social interaction forces
null
10.1137/090749037
null
q-bio.PE nlin.AO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We classify and predict the asymptotic dynamics of a class of swarming models. The model consists of a conservation equation in one dimension describing the movement of a population density field. The velocity is found by convolving the density with a kernel describing attractive-repulsive social interactions. The kernel's first moment and its limiting behavior at the origin determine whether the population asymptotically spreads, contracts, or reaches steady-state. For the spreading case, the dynamics approach those of the porous medium equation. The widening, compactly-supported population has edges that behave like traveling waves whose speed, density and slope we calculate. For the contracting case, the dynamics of the cumulative density approach those of Burgers' equation. We derive an analytical upper bound for the finite blow-up time after which the solution forms one or more $\delta$-functions.
[ { "version": "v1", "created": "Wed, 16 Jan 2008 20:34:12 GMT" }, { "version": "v2", "created": "Thu, 7 Aug 2008 15:39:56 GMT" } ]
2015-05-13T00:00:00
[ [ "Leverentz", "A. J.", "" ], [ "Topaz", "C. M.", "" ], [ "Bernoff", "A. J.", "" ] ]
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801.2567
J. Scott Carter
J. Scott Carter (Univ. of South Alabama), Alissa S. Crans (Loyola Marymount Univ), Mohamed Elhamdadi (Univ. of South Fla.), Enver Karadayi (Univ. of South Fla.), Masahico Saito (Univ. of South Fla.)
Cohomology of Frobenius Algebras and the Yang-Baxter Equation
21 pages, 18 figures, in memory of Xiao Song Lin
null
null
null
math.QA math.CT
null
A cohomology theory for multiplications and comultiplications of Frobenius algebras is developed in low dimensions in analogy with Hochschild cohomology of bialgebras based on deformation theory. Concrete computations are provided for key examples. Skein theoretic constructions give rise to solutions to the Yang-Baxter equation using multiplications and comultiplications of Frobenius algebras, and 2-cocycles are used to obtain deformations of R-matrices thus obtained.
[ { "version": "v1", "created": "Wed, 16 Jan 2008 20:35:36 GMT" } ]
2008-01-17T00:00:00
[ [ "Carter", "J. Scott", "", "Univ. of South Alabama" ], [ "Crans", "Alissa S.", "", "Loyola\n Marymount Univ" ], [ "Elhamdadi", "Mohamed", "", "Univ. of South Fla." ], [ "Karadayi", "Enver", "", "Univ. of South Fla." ], [ "Saito", "Masahico", "", "Univ. of South Fla." ] ]
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801.2568
Eugene Eliseev
Sergei V. Kalinin, Brian J. Rodriguez, Seung-Hyun Kim, S-K. Hong, Alexei Gruverman and Eugene A. Eliseev
Imaging Mechanism of Piezoresponse Force Microscopy in Capacitor Structures
20 pages, 3 figures, 2 tables, 1 Aappendix, to be submitted to Appl. Phys. Lett
null
10.1063/1.2905266
null
cond-mat.mtrl-sci
null
The image formation mechanism in Piezoresponse Force Microscopy (PFM) of capacitor structures is analyzed. We demonstrate that the spatial resolution is a bilinear function of film and top electrode thicknesses, and derive the corresponding analytical expressions. For many perovskites, the opposite contributions of d31 and d33 components can result in anomalous domain wall profiles. This analysis establishes the applicability limits of PFM for polarization dynamics studies in capacitors, and applies to other structural probes, including focused X-ray studies of capacitor structures.
[ { "version": "v1", "created": "Wed, 16 Jan 2008 20:41:15 GMT" } ]
2009-11-13T00:00:00
[ [ "Kalinin", "Sergei V.", "" ], [ "Rodriguez", "Brian J.", "" ], [ "Kim", "Seung-Hyun", "" ], [ "Hong", "S-K.", "" ], [ "Gruverman", "Alexei", "" ], [ "Eliseev", "Eugene A.", "" ] ]
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801.2569
Gabriele Ghisellini
G. Ghisellini and F. Tavecchio (INAF - Osservatorio Astr. di Brera, Italy)
Rapid variability in TeV blazars: the case of PKS 2155-304
Minor changes, accepted for publication in MNRAS Letters
null
10.1111/j.1745-3933.2008.00454.x
null
astro-ph
null
Recent Cherenkov observations of BL Lac objects showed that the TeV flux of PKS 2155-304 changed by a factor 2 in just 3-5 minutes. This fast variability can be accounted for if the emitting region is moving with a bulk Lorentz factor Gamma~50 and a similar relativistic Doppler factor. If this Gamma is adopted, several models can fit the data, but, irrespective of the chosen model, the jet is matter dominated. The Doppler factor requires viewing angles of the order of 1 degree or less: if the entire jet is as narrow as this, then we have problems with current unification schemes. This suggests that there are small active regions, inside a larger jet, moving faster than the rest of the plasma, occasionally pointing at us. Coordinated X-ray/TeV variability can discriminate between the different scenarios.
[ { "version": "v1", "created": "Wed, 16 Jan 2008 21:00:16 GMT" }, { "version": "v2", "created": "Wed, 6 Feb 2008 11:31:53 GMT" } ]
2009-11-13T00:00:00
[ [ "Ghisellini", "G.", "", "INAF - Osservatorio Astr. di Brera,\n Italy" ], [ "Tavecchio", "F.", "", "INAF - Osservatorio Astr. di Brera,\n Italy" ] ]
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801.257
Tesla E. Jeltema
Tesla E. Jeltema, Breanna Binder, and John S. Mulchaey
The Hot Gas Halos of Galaxies in Groups
33 pages, 7 figures, accepted to ApJ, for version with full resolution figures see http://www.ucolick.org/~tesla/groupgals.ps.gz
Astrophys.J.679:1162-1172,2008
10.1086/587508
null
astro-ph
null
We use Chandra observations of 13 nearby groups of galaxies to investigate the hot gas content of their member galaxies. We find that a large fraction of near-IR bright, early-type galaxies in groups have extended X-ray emission, indicating that they retain significant hot gas halos even in these dense environments. In particular, we detect hot gas halos in ~80% of L_K > L_star galaxies. We do not find a significant difference in the L_K-L_X relation for detected group and cluster early-type galaxies. However, we detect X-ray emission from a significantly higher fraction of galaxies brighter than L_star in groups compared to clusters, indicating that a larger fraction of galaxies in clusters experience significant stripping of their hot gas. In addition, group and cluster galaxies appear to be X-ray faint compared to field galaxies, though a Chandra based field sample is needed to confirm this result. The near-IR bright late-types galaxies in clusters and groups appear to follow the L_K-L_X relation for early-type galaxies, while near-IR fainter late-type galaxies are significantly more X-ray luminous than this relation likely due to star formation. Finally, we find individual examples of ongoing gas stripping of group galaxies. One galaxy shows a 40-50 kpc X-ray tail, and two merging galaxy systems show tidal bridges/tails of X-ray emission. Therefore, stripping of hot galactic gas through both ram pressure and tidal forces does occur in groups and clusters, but the frequency or efficiency of such events must be moderate enough to allow hot gas halos in a large fraction of bright galaxies to survive even in group and cluster cores.
[ { "version": "v1", "created": "Wed, 16 Jan 2008 21:12:19 GMT" } ]
2010-11-11T00:00:00
[ [ "Jeltema", "Tesla E.", "" ], [ "Binder", "Breanna", "" ], [ "Mulchaey", "John S.", "" ] ]
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801.2571
R. B. Metcalf
R. Benton Metcalf and S.D.M. White
Cosmological Information in the Gravitational Lensing of Pregalactic HI
submitted to MNRAS, 12 pages, error in computer code corrected which changed constraints on some cosmological parameters, change to lensing estimator to improve performance
Mon.Not.Roy.Astron.Soc.394:704-714,2009
10.1111/j.1365-2966.2009.14401.x
null
astro-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study the constraints which the next generation of radio telescopes could place on the nature of dark energy, dark matter and inflation by studying the gravitational lensing of high redshift 21 cm emission, and we compare with the constraints obtainable from wide-angle surveys of galaxy lensing. If the reionization epoch is effectively at z ~ 8 or later, very large amounts of cosmological information will be accessible to telescopes like SKA and LOFAR. We use simple characterizations of reionization history and of proposed telescope designs to investigate how well the two-dimensional convergence power spectrum, the three-dimensional matter power spectrum, the evolution of the linear growth function, and the standard cosmological parameters can be measured from radio data. The power spectra can be measured accurately over a wide range of wavenumbers at z ~ 2, and the evolution in the cosmic energy density can be probed from z ~ 0.5 to z ~ 7. This results in a characterization of the shape of the power spectra (i.e. of the nature of dark matter and of inflationary structure generation) which is potentially more precise than that obtained from galaxy lensing surveys. On the other hand, the dark energy parameters in their conventional parametrization (Omega_Lambda, w_o, w_a) are somewhat less well constrained by feasible 21 cm lensing surveys than by an all-sky galaxy lensing survey although a 21 cm surveys might be more powerful than galaxy surveys for constraining models with "early" dark energy. Overall, the best constraints come from combining surveys of the two types. This results in extremely tight constraints on dark matter and inflation, and improves constraints on dark energy, as judged by the standard figure of merit, by more than an order of magnitude over either survey alone.
[ { "version": "v1", "created": "Wed, 16 Jan 2008 21:10:01 GMT" }, { "version": "v2", "created": "Mon, 15 Dec 2008 16:38:59 GMT" } ]
2009-06-23T00:00:00
[ [ "Metcalf", "R. Benton", "" ], [ "White", "S. D. M.", "" ] ]
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801.2572
Dai Yamazaki
Dai G. Yamazaki, Kiyotomo Ichiki, Toshitaka Kajino, Grant J. Mathews
Effects of a Primordial Magnetic Field on Low and High Multipoles of the CMB
15 pages, 2 figures, submitted to PRD 7 May 2007, accepted for publication in PRD 14 Jan 2008. Figure 1 is revised
Phys.Rev.D77:043005,2008
10.1103/PhysRevD.77.043005
null
astro-ph gr-qc
null
The existence of a primordial magnetic field (PMF) would affect both the temperature and polarization anisotropies of the cosmic microwave background (CMB). It also provides a plausible explanation for the possible disparity between observations and theoretical fits to the CMB power spectrum. Here we report on calculations of not only the numerical CMB power spectrum from the PMF, but also the correlations between the CMB power spectrum from the PMF and the primary curvature perturbations. We then deduce a precise estimate of the PMF effect on all modes of perturbations. We find that the PMF affects not only the CMB TT and TE modes on small angular scales, but also on large angular scales. The introduction of a PMF leads to a better fit to the CMB power spectrum for the higher multipoles, and the fit at lowest multipoles can be used to constrain the correlation of the PMF with the density fluctuations for large negative values of the spectral index. Our prediction for the BB mode for a PMF average field strength $|B_\lambda| =4.0$ nG is consistent with the upper limit on the BB mode deduced from the latest CMB observations. We find that the BB mode is dominated by the vector mode of the PMF for higher multipoles. We also show that by fitting the complete power spectrum one can break the degeneracy between the PMF amplitude and its power spectral index.
[ { "version": "v1", "created": "Thu, 17 Jan 2008 16:20:42 GMT" }, { "version": "v2", "created": "Thu, 14 Feb 2008 12:33:40 GMT" }, { "version": "v3", "created": "Sat, 16 Feb 2008 06:04:05 GMT" } ]
2008-12-18T00:00:00
[ [ "Yamazaki", "Dai G.", "" ], [ "Ichiki", "Kiyotomo", "" ], [ "Kajino", "Toshitaka", "" ], [ "Mathews", "Grant J.", "" ] ]
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