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712.2279
Kenny Easwaran
Kenny Easwaran
A Cheerful Introduction to Forcing and the Continuum Hypothesis
null
null
null
null
math.LO math.GM
null
This is an introduction to the set-theoretic method of forcing, including its application in proving the independence of the Continuum Hypothesis from the Zermelo-Fraenkel axioms of set theory. I presuppose no particular mathematical background beyond some familiarity with set theory and mathematical logic - in particular, no algebra is presupposed, though it can be useful. The goal is to have a document that makes this material accessible to mathematics graduate students in all fields, and to philosophers with an interest in set theory and mathematical logic but no other mathematical background.
[ { "version": "v1", "created": "Fri, 14 Dec 2007 03:37:42 GMT" } ]
2007-12-17T00:00:00
[ [ "Easwaran", "Kenny", "" ] ]
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712.228
Raul Angulo
R. E. Angulo, C. M. Baugh, C. G. Lacey
The assembly bias of dark matter haloes to higher orders
13 pages, 6 figures. Published version
2008MNRAS.387..921A
10.1111/j.1365-2966.2008.13304.x
null
astro-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We use an extremely large volume ($2.4h^{-3}{\rm Gpc}^{3}$), high resolution N-body simulation to measure the higher order clustering of dark matter haloes as a function of mass and internal structure. As a result of the large simulation volume and the use of a novel ``cross-moment'' counts-in-cells technique which suppresses discreteness noise, we are able to measure the clustering of haloes corresponding to rarer peaks than was possible in previous studies; the rarest haloes for which we measure the variance are 100 times more clustered than the dark matter. We are able to extract, for the first time, halo bias parameters from linear up to fourth order. For all orders measured, we find that the bias parameters are a strong function of mass for haloes more massive than the characteristic mass $M_{*}$. Currently, no theoretical model is able to reproduce this mass dependence closely. We find that the bias parameters also depend on the internal structure of the halo up to fourth order. For haloes more massive than $M_{*}$, we find that the more concentrated haloes are more weakly clustered than the less concentrated ones. We see no dependence of clustering on concentration for haloes with masses $M<M_{*}$; this is contrary to the trend reported in the literature when segregating haloes by their formation time. Our results are insensitive to whether haloes are labelled by the total mass returned by the friends-of-friends group finder or by the mass of the most massive substructure. This implies that our conclusions are not an artefact of the particular choice of group finding algorithm. Our results will provide important input to theoretical models of galaxy clustering.
[ { "version": "v1", "created": "Fri, 14 Dec 2007 20:56:49 GMT" }, { "version": "v2", "created": "Fri, 14 Dec 2007 21:02:30 GMT" }, { "version": "v3", "created": "Thu, 31 Jul 2008 14:29:35 GMT" } ]
2008-07-31T00:00:00
[ [ "Angulo", "R. E.", "" ], [ "Baugh", "C. M.", "" ], [ "Lacey", "C. G.", "" ] ]
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712.2281
Kei-Jiro Takahashi
Tetsuji Kimura, Mitsuhisa Ohta and Kei-Jiro Takahashi
Type IIA orientifolds and orbifolds on non-factorizable tori
42 pages, 3 figures, v2: typos corrected, references added, version to appear in Nucl. Phys. B
Nucl.Phys.B798:89-123,2008
10.1016/j.nuclphysb.2008.01.030
KUNS-2100, YITP-07-82
hep-th
null
We investigate Type II orientifolds on non-factorizable torus with and without its oribifolding. We explicitly calculate the Ramond-Ramond tadpole from string one-loop amplitudes, and confirm that the consistent number of orientifold planes is directly derived from the Lefschetz fixed point theorem. We furthermore classify orientifolds on non-factorizable Z_N x Z_M orbifolds, and construct new supersymmetric Type IIA orientifold models on them.
[ { "version": "v1", "created": "Fri, 14 Dec 2007 20:11:21 GMT" }, { "version": "v2", "created": "Fri, 14 Mar 2008 03:22:15 GMT" } ]
2008-11-26T00:00:00
[ [ "Kimura", "Tetsuji", "" ], [ "Ohta", "Mitsuhisa", "" ], [ "Takahashi", "Kei-Jiro", "" ] ]
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712.2282
Albert Roura
Guillem Perez-Nadal, Albert Roura, Enric Verdaguer
Stability of de Sitter spacetime under isotropic perturbations in semiclassical gravity
19 pages, REVTeX4
Phys.Rev.D77:124033,2008
10.1103/PhysRevD.77.124033
LA-UR-07-7066
gr-qc
null
A spatially flat Robertson-Walker spacetime driven by a cosmological constant is non-conformally coupled to a massless scalar field. The equations of semiclassical gravity are explicitly solved for this case, and a self-consistent de Sitter solution associated with the Bunch-Davies vacuum state is found (the effect of the quantum field is to shift slightly the effective cosmological constant). Furthermore, it is shown that the corrected de Sitter spacetime is stable under spatially-isotropic perturbations of the metric and the quantum state. These results are independent of the free renormalization parameters.
[ { "version": "v1", "created": "Fri, 14 Dec 2007 05:14:45 GMT" } ]
2008-11-26T00:00:00
[ [ "Perez-Nadal", "Guillem", "" ], [ "Roura", "Albert", "" ], [ "Verdaguer", "Enric", "" ] ]
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712.2283
Bruno Julia Diaz
B. Julia-Diaz, T.-S. H. Lee, A. Matsuyama, T. Sato, L.C. Smith
Dynamical Coupled-Channels Effects on Pion Photoproduction
Corrected version. 14 pages, 10 figures
Phys.Rev.C77:045205,2008
10.1103/PhysRevC.77.045205
null
nucl-th
null
The electromagnetic pion production reactions are investigated within the dynamical coupled-channels model developed in {\bf Physics Reports, 439, 193 (2007)}. The meson-baryon channels included in this study are $\gamma N$, $\pi N$, $\eta N$, and the $\pi\Delta$, $\rho N$ and $\sigma N$ resonant components of the $\pi\pi N$ channel. With the hadronic parameters of the model determined in a recent study of $\pi N$ scattering, we show that the pion photoproduction data up to the second resonance region can be described to a very large extent by only adjusting the bare $\gamma N \to N^*$ helicity amplitudes, while the non-resonant electromagnetic couplings are taken from previous works. It is found that the coupled-channels effects can contribute about 10 - 20 % of the production cross sections in the $\Delta$ (1232) resonance region, and can drastically change the magnitude and shape of the cross sections in the second resonance region. The importance of the off-shell effects in a dynamical approach is also demonstrated. The meson cloud effects as well as the coupled-channels contributions to the $\gamma N \to N^*$ form factors are found to be mainly in the low $Q^2$ region. For the magnetic M1 $\gamma N \to \Delta$ (1232) form factor, the results are close to that of the Sato-Lee Model. Necessary improvements to the model and future developments are discussed.
[ { "version": "v1", "created": "Fri, 14 Dec 2007 05:20:22 GMT" }, { "version": "v2", "created": "Mon, 7 Jan 2008 16:16:41 GMT" } ]
2008-11-26T00:00:00
[ [ "Julia-Diaz", "B.", "" ], [ "Lee", "T. -S. H.", "" ], [ "Matsuyama", "A.", "" ], [ "Sato", "T.", "" ], [ "Smith", "L. C.", "" ] ]
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712.2284
Andrzej Niedzielski
Andrzej Niedzielski and Aleksander Wolszczan
The PennState/Toru\'n Center for Astronomy Search for Planets around Evolved Stars
5 pages, to appear in ,,Extreme Solar Systems'', 2007 ASP Conference Series, eds. Debra Fischer, Fred Rasio, Steve Thorsett and Alex Wolszczan
null
null
null
astro-ph
null
We present the motivation for and the first results from a large radial velocity search for planets around red giants with the 9.2-m Hobby-Eberly Telescope.
[ { "version": "v1", "created": "Fri, 14 Dec 2007 05:28:38 GMT" } ]
2007-12-17T00:00:00
[ [ "Niedzielski", "Andrzej", "" ], [ "Wolszczan", "Aleksander", "" ] ]
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712.2285
Andrzej Niedzielski
Grzegorz Nowak and Andrzej Niedzielski
The PSU/TCfA Search for Planets Around Evolved Stars: Bisector Analysis of Activity of a Sample of Red Giants
2 pages, to appear in "Extreme Solar Systems", 2007 ASP Conference Series, eds. Debra Fischer, Fred Rasio, Steve Thorsett and Alex Wolszczan
null
null
null
astro-ph
null
Searches for planets around evolved G-K subgiant and giant stars are essential for developing general understanding of planet formation and evolution of the planetary systems. Precise radial velocity (RV) measurements of giants have lead to the discovery of ten planets around such star. However, the long period radial velocity variations of red giants may also have other than planetary nature. Non-radial oscillations or rotational modulation due to starspots can also induce RV variations, thereby mimicking the gravitational influence of low-mass companions. In this work we present bisector analysis of five carefully selected lines for two stars from our survey.
[ { "version": "v1", "created": "Fri, 14 Dec 2007 05:38:40 GMT" } ]
2007-12-17T00:00:00
[ [ "Nowak", "Grzegorz", "" ], [ "Niedzielski", "Andrzej", "" ] ]
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712.2286
Andrzej Niedzielski
Grzegorz Nowak and Andrzej Niedzielski
The PSU/TCfA Search for Planets Around Evolved Stars: Vsin(i) Measurements for Slow Rotating F-K Giants
2 pages, to appear in "Extreme Solar Systems", 2007 ASP Conference Series, eds. Debra Fischer, Fred Rasio, Steve Thorsett and Alex Wolszczan
null
null
null
astro-ph
null
We present results of our projected rotational velocities (Vsin(i)) measurements of F, G and K giants obtained from the cross-correlation function (CCF) constructed from high signal to noise spectra. We also present the calibration of the HET/HRS cross-correlation function to determine accurate projected rotational velocities Vsin(i) for slowly-rotating F-K giants.
[ { "version": "v1", "created": "Fri, 14 Dec 2007 07:45:21 GMT" } ]
2007-12-17T00:00:00
[ [ "Nowak", "Grzegorz", "" ], [ "Niedzielski", "Andrzej", "" ] ]
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712.2287
Andrzej Niedzielski
Pawel Zielinski and Andrzej Niedzielski
The PennState/Toru\'n Center for Astronomy Search for Planets Around Evolved Stars. Basic parameters of a sample of evolved stars
2 pages, to appear in "Extreme Solar Systems", 2007 ASP Conference Series, eds. Debra Fischer, Fred Rasio, Steve Thorsett and Alex Wolszczan
null
10.1016/j.actao.2008.03.008
null
astro-ph
null
The objective of the PSU/TCfA Search for Planets Around Evolved Stars is to study evolution of planetary systems in the stellar evolution timescale. For such an analysis precise physical parameters of the hosts of the planetary systems are essential. In this paper we present an attempt to obtain basic physical parameters for a sample of evolved stars observed within our survey with the High Resolution Spectrograph of the Hobby-Eberly Telescope.
[ { "version": "v1", "created": "Fri, 14 Dec 2007 05:56:59 GMT" } ]
2009-11-13T00:00:00
[ [ "Zielinski", "Pawel", "" ], [ "Niedzielski", "Andrzej", "" ] ]
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712.2288
Yu Shi
Yu Shi, Yue-Liang Wu
CP Measurement in Quantum Teleportation of Neutral Mesons
7 pages
Eur.Phys.J.C55:477-482,2008
10.1140/epjc/s10052-008-0593-7
null
hep-ph quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Quantum teleportation using neutral pseudoscalar mesons shows novel connections between particle physics and quantum information. The projection basis, which is crucial in the teleportation process, is determined by the conservation laws of particle physics, and is different from the Bell basis, as in the usual case. Here we show that one can verify the teleportation process by CP measurement. This method significantly simplifies the high energy quantum teleportation protocol. Especially, it is rigorous, and is independent of whether CP is violated in weak decays. This method can also be applied to general verification of Einstein-Podolsky-Rosen correlations in particle physics.
[ { "version": "v1", "created": "Fri, 14 Dec 2007 06:20:49 GMT" }, { "version": "v2", "created": "Tue, 8 Jul 2008 08:33:01 GMT" } ]
2008-11-26T00:00:00
[ [ "Shi", "Yu", "" ], [ "Wu", "Yue-Liang", "" ] ]
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712.2289
Mitsutoshi Fujita
Mitsutoshi Fujita
Non-equilibrium thermodynamics near the horizon and holography
15 pages; v2, v3: typos (in eq. (32) etc.) corrected, v4:refs. added, minor corrections, sections enlarged, v5, v6:explanation clarified
JHEP 0810:031,2008
10.1088/1126-6708/2008/10/031
KUNS-2115
hep-th gr-qc
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Small perturbations of a black brane are interpreted as small deviations from thermodynamic equilibrium in a dual theory with the AdS/CFT correspondence. In this paper, we calculate hydrodynamics of the dual Yang-Mills theory in the gravity side using membrane paradigm. This method is different from the usual AdS/CFT correspondence and evaluate classical solutions not at boundaries but at the place slightly away from a horizon. There are sound modes or shear modes for gravity perturbation. For sound modes, such calculation at the horizon has not yet been done. Then, we find that boundary stress tensor at the horizon satisfies conservation law in flat space and can represent dissipative parts of stress tensor in the dual theory by holography. Using them, we can read off directly shear and bulk viscosity of the dual theory. Quasinormal modes are solutions to linearized equations obeyed by classical fluctuations of a gravitational background subject to specific boundary conditions and are also gauge-invariant quantities. We use solutions for each fluctuation that compose such quantities and show that quasinormal modes are consistent with the membrane paradigm.
[ { "version": "v1", "created": "Fri, 14 Dec 2007 06:34:15 GMT" }, { "version": "v2", "created": "Thu, 20 Dec 2007 05:34:01 GMT" }, { "version": "v3", "created": "Sun, 23 Dec 2007 14:42:50 GMT" }, { "version": "v4", "created": "Sun, 20 Jan 2008 10:52:45 GMT" }, { "version": "v5", "created": "Sun, 30 Mar 2008 13:15:16 GMT" }, { "version": "v6", "created": "Tue, 2 Sep 2008 13:33:47 GMT" } ]
2009-12-15T00:00:00
[ [ "Fujita", "Mitsutoshi", "" ] ]
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712.229
Alex Degtyarev
Alex Degtyarev
Irreducible plane sextics with large fundamental groups
A revised version: a few proofs added/clarified
J. Math. Soc. Japan, 61:4 (2009), 1131--1169
null
null
math.AG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We compute the fundamental group of the complement of each irreducible sextic of weight eight or nine (in a sense, the largest groups for irreducible sextics), as well as of 169 of their derivatives (both of and not of torus type). We also give a detailed geometric description of sextics of weight eight and nine and of their moduli spaces and compute their Alexander modules; the latter are shown to be free over an appropriate ring.
[ { "version": "v1", "created": "Fri, 14 Dec 2007 06:35:24 GMT" }, { "version": "v2", "created": "Wed, 10 Sep 2008 10:53:52 GMT" } ]
2010-01-25T00:00:00
[ [ "Degtyarev", "Alex", "" ] ]
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712.2291
Ikuo Ichinose
T.Ono, S.Doi, Y.Hori, I.Ichinose, and T.Matsui
Phase Structure and Critical Behavior of Multi-Higgs U(1) Lattice Gauge Theory in Three Dimensions
Long version of arXiv:0704.1323, New results added
Annals of Physics 324(2009)2453
null
null
hep-lat astro-ph cond-mat.str-el
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study the three-dimensional (3D) compact U(1) lattice gauge theory coupled with $N$-flavor Higgs fields by means of the Monte Carlo simulations. This model is relevant to multi-component superconductors, antiferromagnetic spin systems in easy plane, inflational cosmology, etc. It is known that there is no phase transition in the N=1 model. For N=2, we found that the system has a second-order phase transition line $\tilde{c}_1(c_2)$ in the $c_2$(gauge coupling)$-c_1$(Higgs coupling) plane, which separates the confinement phase and the Higgs phase. Numerical results suggest that the phase transition belongs to the universality class of the 3D XY model as the previous works by Babaev et al. and Smiseth et al. suggested. For N=3, we found that there exists a critical line similar to that in the N=2 model, but the critical line is separated into two parts; one for $c_2 < c_{2{\rm tc}}=2.4\pm 0.1$ with first-order transitions, and the other for $ c_{2{\rm tc}} < c_2$ with second-order transitions, indicating the existence of a tricritical point. We verified that similar phase diagram appears for the N=4 and N=5 systems. We also studied the case of anistropic Higgs coupling in the N=3 model and found that there appear two second-order phase transitions or a single second-order transition and a crossover depending on the values of the anisotropic Higgs couplings. This result indicates that an "enhancement" of phase transition occurs when multiple phase transitions coincide at a certain point in the parameter space.
[ { "version": "v1", "created": "Fri, 14 Dec 2007 07:58:06 GMT" }, { "version": "v2", "created": "Wed, 29 Apr 2009 06:28:42 GMT" } ]
2009-10-26T00:00:00
[ [ "Ono", "T.", "" ], [ "Doi", "S.", "" ], [ "Hori", "Y.", "" ], [ "Ichinose", "I.", "" ], [ "Matsui", "T.", "" ] ]
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712.2292
Tsung-Wen Yeh
Tsung-Wen Yeh
QCD factorization at twist-3: the two parton contributions
67 pages, 7 figures, typos corrected, six references added;
null
null
null
hep-ph
null
In this paper, the twist-3 two parton corrections in charmless $B\to PP$ decays are shown to be factorizable under the QCD factorization approach. The factorizability of the twist-3 two parton corrections is constructed on the following findings. Under the energetic meson limit, the pseudoscalar distribution amplitude for a light pseudoscalar meson is allowed to be non-constant by the equations of motion for the quark. The non-constant pseudoscalar distribution amplitude is then used to regularize the end-point divergences in the hard spectator corrections at twist-3 order. By retaining the momentum fraction variable of the spectator quark of the $B$ meson in the propagators, the end-point divergence in the weak annihilation corrections at twist-3 order is resolved. The factorization of the $O(\alpha_s)$ corrections under the two parton approximation is shown valid up-to $O(1/m_b)$ . The hard scattering kernels of order $O(\alpha_s)$ and $O(\Lambda_{QCD}/m_b)$ are explicitly given and found to be infrared finite. The results are applied for making predictions for the branching ratios of $B\to \pi K $ decays.
[ { "version": "v1", "created": "Fri, 14 Dec 2007 06:42:15 GMT" }, { "version": "v2", "created": "Thu, 3 Jan 2008 08:24:35 GMT" }, { "version": "v3", "created": "Thu, 6 Mar 2008 12:28:27 GMT" } ]
2008-03-06T00:00:00
[ [ "Yeh", "Tsung-Wen", "" ] ]
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712.2293
Kazufumi Kimoto
Kazufumi Kimoto
Representation theory of the $\alpha$-determinant and zonal spherical functions
9 pages
null
null
null
math.RT
null
We prove that the multiplicity of each irreducible component in the $\mathcal{U}(\mathfrak{gl}_n)$-cyclic module generated by the $l$-th power $\det^{(\alpha)}(X)^l$ of the $\alpha$-determinant is given by the rank of a matrix whose entries are given by a variation of the spherical Fourier transformation for $(\mathfrak{S}_{nl},\mathfrak{S}_l^n)$. Further, we calculate the matrix explicitly when $n=2$. This gives not only another proof of the result by Kimoto-Matsumoto-Wakayama (2007) but also a new aspect of the representation theory of the $\alpha$-determinants.
[ { "version": "v1", "created": "Fri, 14 Dec 2007 06:48:53 GMT" } ]
2007-12-17T00:00:00
[ [ "Kimoto", "Kazufumi", "" ] ]
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712.2294
Amaya Moro-Martin
Amaya Moro-Martin
On the Solar System-Debris Disk Connecction
8 pages, Exoplanets: Detection, Formation and Dynamics Proceedings IAU Symposium No. 249 2008
null
10.1017/S1743921308016803
null
astro-ph
null
This paper emphasizes the connection between solar and extra-solar debris disks: how models and observations of the Solar System are helping us understand the debris disk phenomenon, and vice versa, how debris disks are helping us place our Solar System into context.
[ { "version": "v1", "created": "Fri, 14 Dec 2007 06:49:56 GMT" } ]
2009-11-13T00:00:00
[ [ "Moro-Martin", "Amaya", "" ] ]
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712.2295
Wei Huang
Wei Huang, Zhaohui Wei
Efficient One-way Quantum Computations for Quantum Error Correction
null
null
null
null
quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We show how to explicitly construct an $O(nd)$ size and constant quantum depth circuit which encodes any given $n$-qubit stabilizer code with $d$ generators. Our construction is derived using the graphic description for stabilizer codes and the one-way quantum computation model. Our result demonstrates how to use cluster states as scalable resources for many multi-qubit entangled states and how to use the one-way quantum computation model to improve design of quantum algorithms.
[ { "version": "v1", "created": "Fri, 14 Dec 2007 07:12:17 GMT" }, { "version": "v2", "created": "Mon, 18 Aug 2008 18:53:25 GMT" } ]
2008-08-18T00:00:00
[ [ "Huang", "Wei", "" ], [ "Wei", "Zhaohui", "" ] ]
[ 0.0145101268, -0.0372073911, 0.0011721776, 0.1004624739, -0.0133135449, 0.0034637889, -0.007330637, 0.0932577923, -0.1171894297, 0.069426924, 0.1266613156, 0.0651444197, -0.0676131621, -0.0300027095, 0.0407593474, -0.0465785153, 0.077740021, -0.020543417, 0.0528007373, 0.1348232627, -0.0701826587, -0.1012182087, 0.118197076, -0.0328996964, 0.0037818276, 0.0575870648, 0.0968853235, 0.0345371254, 0.1286766082, -0.1244444922, 0.0193468351, -0.0471075289, -0.0589473918, -0.0999586508, -0.0207449477, 0.1470157951, -0.0364768468, 0.0162735097, -0.0806621984, 0.075019367, 0.0020200186, -0.0413387455, -0.0418929532, -0.0427998342, 0.1140657216, 0.032798931, -0.0621718615, 0.0326729752, -0.016865503, 0.0619703345, 0.0432280861, 0.0835339949, -0.0695276931, -0.001684661, -0.0593504496, 0.0520450026, -0.0160215981, 0.0794530213, 0.0370058604, 0.0294485036, 0.1451012641, -0.0521961488, -0.0248888973, 0.0619703345, -0.0141322585, -0.0226972643, -0.0861034989, 0.0213495363, 0.0512136929, 0.0985479429, -0.0871111453, 0.0589473918, 0.1006136239, -0.0576878302, 0.0740117207, -0.002917455, -0.0225587133, 0.1381485015, 0.0677643046, 0.0222564191, 0.0627260655, 0.0112352716, 0.1542708576, -0.0312874615, -0.0067827287, -0.0096608223, -0.0432784669, -0.0654467195, -0.0825767294, -0.0674620122, 0.0386432894, 0.035721112, 0.0079793101, -0.0139811113, 0.0998578891, 0.0293477383, 0.0945677385, 0.0504075773, -0.014031494, -0.0473594405, -0.0234152135, -0.0958776772, 0.0481907502, 0.0096482262, 0.0553198569, -0.0832820833, -0.1168871298, 0.0279622227, -0.0571336225, 0.0944669694, 0.0026844365, -0.03443636, -0.1282735467, -0.0578893609, -0.0118146688, -0.0485686176, 0.0067512398, -0.0730544552, -0.0667566583, 0.089781411, -0.0484678522, -0.0635321885, 0.0142078325, 0.0027300955, -0.0476365462, -0.0326981694, -0.012331089, -0.1327072084, 0.0716941357, 0.0062474157, 0.115476422, 0.0545641221, 0.0597031265, 0.0850958452, -0.042371586, -0.0394242145, -0.0161475539, 0.051793091, 0.0441601612, 0.0050697275, 0.0532037988, -0.0149887595, 0.0389707759, -0.0137795825, -0.0187548418, 0.059451215, -0.0165254213, 0.034713462, 0.0186162908, 0.0341844484, -0.0652451888, -0.1091282442, -0.0317660943, -0.0043486296, 0.0081367549, -0.0198758505, -0.0927539691, 0.0716941357, -0.0046131369, -0.027987415, 0.0834332258, 0.0494251177, -0.1000594124, -0.0377867892, 0.1145695448, -0.0414143205, -0.0772361979, -0.0425983071, -0.0792011097, 0.0270049591, 0.0872119069, 0.0253549349, 0.0101331575, 0.007299148, 0.0596023612, -0.0657490119, -0.0345875062, -0.1587045044, -0.0979433581, -0.0936608538, -0.0109329773, -0.0242843088, 0.0365272276, 0.0440845862, -0.0215384699, -0.0576878302, 0.0576878302, 0.0098938411, 0.0113297384, -0.0512388833, -0.0823248178, 0.0924516767, -0.0014949398, 0.0862042606, 0.0110148489, -0.0913432613, 0.0663536042, -0.0402807146, 0.1547746807, -0.1513486803, -0.0016767888, 0.002539587, 0.0118272649, -0.0245362222, 0.0846927911, -0.0663536042, 0.0264255609, -0.0251911916, -0.0221934412, 0.0559748299, -0.0062568625, 0.0285164304, 0.0190949235, -0.0228736028, 0.0343355946, 0.0132379718, -0.0337310061, -0.0458731614, -0.0774377286, 0.0105488114, -0.0637337193, 0.0067449417, -0.0268286206, 0.0052303211, -0.0445380285, 0.0191579014, -0.0881691724, -0.0286675766, 0.0809141099, -0.0033315353, -0.0606100075, 0.0009926904, 0.0198128726, -0.0080611818, -0.0106936609, 0.0170544367, 0.0659505427, -0.1548754573, 0.0008250115, -0.0987998545, -0.0387188643, 0.001201305, 0.046200648, 0.0178101733, -0.0522969142, 0.1023770049, -0.0531030335, 0.0181628503, -0.0117453933, -0.0053720218, -0.0219163373, 0.0373585373, -0.0221934412, -0.0637337193, -0.0726514012, -0.0414647013 ]
712.2296
Toshiaki Shoji
Toshiaki Shoji
Lusztig's conjecture for finite classical groups with even characteristic
30 pages
null
null
null
math.RT
null
The determination of scalars involved in Lusztig's conjecture for finite reductive groups $G(F_q)$ was achieved by Waldspurger in the case of symplectic groups or orthogonal groups, under the condition that $p,q$ are large enough. Here $p$ is the characteristic of the finite field $F_q$. In this paper, we determine the scalars in the case of symplectic groups with $p = 2$, by applying the theory of symmetric spaces over a finite field due to Kawanaka and Lusztig. We also obtain a partial result in the case of special orthogonal groups with $p = 2$.
[ { "version": "v1", "created": "Fri, 14 Dec 2007 07:13:31 GMT" } ]
2007-12-17T00:00:00
[ [ "Shoji", "Toshiaki", "" ] ]
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712.2297
Andrzej Niedzielski
Andrzej Niedzielski, Alex Wolszczan
A HET search for planets around evolved stars
6 pages, to appear in ,,Exoplanets. Detection, Formation & Dynamics'' IAU Symposium 249, Cambridge University Press, 2007
null
10.1017/S1743921308016347
null
astro-ph
null
We present our ongoing survey of ~1000 GK-giants with the 9.2-m Hobby-Eberly Telescope in search for planets around evolved stars. The stars selected for this survey are brighter than 11 mag and are located in the section of the HR-diagram, which is approximately delimited by the main sequence, the instability strip, and the coronal dividing line. We use the High Resolution Spectrograph to obtain stellar spectra for radial velocity measurements with a 4-6 m/s precision. So far, the survey has discovered a planetary-mass companion to the K0-giant HD 17092, and it has produced a number of plausible planet candidates around other stars. Together with other similar efforts, our program provides information on planet formation around intermediate mass main sequence-progenitors and it will create the experimental basis with which to study dynamics of planetary systems around evolving stars.
[ { "version": "v1", "created": "Fri, 14 Dec 2007 07:24:30 GMT" } ]
2009-11-13T00:00:00
[ [ "Niedzielski", "Andrzej", "" ], [ "Wolszczan", "Alex", "" ] ]
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712.2298
Andrzej Niedzielski
Andrzej Niedzielski, Grzegorz Nowak and Pawel Zielinski
The PSU/TCfA Search for Planets around Evolved Stars. Stellar parameters and activity indicators of targets
5 pages, to appear in ,,Exoplanets. Detection, Formation & Dynamics'' IAU Symposium 249, Cambridge University Press, 2007
null
10.1017/S1743921308016359
null
astro-ph
null
The main objective of the Penn State/Torun Centre for Astronomy Search for Planets around Evolved Stars is the detection of planetary systems around massive, evolved stars. We are also interested in the evolution of these systems on stellar evolution timescales. In this paper we present our approach to determine the basic physical parameters of our targets GK-giants. We also discuss the stellar activity indicators used in our survey: line bisector and curvature, and Halpha variability.
[ { "version": "v1", "created": "Fri, 14 Dec 2007 07:32:20 GMT" } ]
2009-11-13T00:00:00
[ [ "Niedzielski", "Andrzej", "" ], [ "Nowak", "Grzegorz", "" ], [ "Zielinski", "Pawel", "" ] ]
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712.2299
Dave Witte Morris
Dave Witte Morris
What is a superrigid subgroup?
18 pages, 7 figures
null
null
null
math.HO math.MG
null
This is an expository paper. It is well known that a linear transformation can be defined to have any desired action on a basis. From this fact, one can show that every group homomorphism from Z^k to R^d extends to a homomorphism from R^k to R^d, and we will see other examples of discrete subgroups H of connected groups G, such that the homomorphisms defined on $H$ can ("almost") be extended to homomorphisms defined on all of G. This is related to a very classical topic in geometry, the study of linkages.
[ { "version": "v1", "created": "Fri, 14 Dec 2007 07:39:03 GMT" } ]
2007-12-17T00:00:00
[ [ "Morris", "Dave Witte", "" ] ]
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712.23
P. F. Chen
D. H. Gao, P. F. Chen, M. D. Ding, and X. D. Li
Simulations of the periodic flaring rate on YY Gem
9 pages, 9 figures, accepted by MNRAS
null
10.1111/j.1365-2966.2007.12830.x
null
astro-ph
null
The binary YY Gem shows many interesting properties, one of which is the periodicity in its flaring rate. The period, which is about $48 \pm 3$ min, was ever interpreted in terms of the oscillation of a filament. In this paper, we propose a new model to explain this phenomenon by means of 2.5-dimensional MHD numerical simulations. It is found that magnetic reconnection is induced as the coronal loops rooted on both stars inflate and approach each other, which is driven by the differential stellar rotation. The magnetic reconnection is modulated by fast-mode magnetoacoustic waves which are trapped between the surfaces of the two stars, so that the reconnection rate presents a periodic behaviour. With the typical parameters for the binary system, the observed period can be reproduced. We also derive an empirical formula to relate the period of the flaring rate to the coronal temperature and density, as well as the magnetic field.
[ { "version": "v1", "created": "Fri, 14 Dec 2007 07:51:51 GMT" } ]
2009-11-13T00:00:00
[ [ "Gao", "D. H.", "" ], [ "Chen", "P. F.", "" ], [ "Ding", "M. D.", "" ], [ "Li", "X. D.", "" ] ]
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712.2301
Ho Seong Hwang
Ho Seong Hwang (Seoul National Univ, Korea Institute for Advanced Study), Myung Gyoon Lee (Seoul National Univ.)
Galaxy Orbits for Galaxy Clusters in Sloan Digital Sky Survey and 2dF Galaxy Redshift Survey
59 pages, 21 figures. To appear in ApJ. Paper with high resolution figures are available at http://astro.kias.re.kr/~hshwang/papers/orbit.pdf
Astrophys.J.676:218-247,2008
10.1086/528733
null
astro-ph
null
We present the results of a study for galaxy orbits in galaxy clusters using a spectroscopic sample of galaxies in Sloan Digital Sky Survey (SDSS) and 2dF Galaxy Redshift Survey (2dFGRS). We have determined the member galaxies of Abell clusters covered by these surveys using the galaxies' redshift and positional data. We have selected 10 clusters using three criteria: the number of member galaxies is greater than or equal to 40, the spatial coverage is complete, and X-ray mass profile is available in the literature. We derive the radial profile of the galaxy number density and velocity dispersion using all, early-type, and late-type galaxies for each cluster. We have investigated the galaxy orbits for our sample clusters with constant and variable velocity anisotropies over the clustercentric distance using Jeans equation. Using all member galaxies, the galaxy orbits are found to be isotropic within the uncertainty for most of sample clusters, although it is difficult to conclude strongly for some clusters due the large errors and the variation as a function of the clustercentric distance in the calculated velocity anisotropies. We investigated the orbital difference between early-type and late-type galaxies for four sample clusters, and found no significant difference between them.
[ { "version": "v1", "created": "Fri, 14 Dec 2007 08:11:51 GMT" } ]
2008-11-26T00:00:00
[ [ "Hwang", "Ho Seong", "", "Seoul National Univ, Korea Institute for Advanced\n Study" ], [ "Lee", "Myung Gyoon", "", "Seoul National Univ." ] ]
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712.2302
Georg Hager
Georg Hager, Thomas Zeiser, Gerhard Wellein
Data access optimizations for highly threaded multi-core CPUs with multiple memory controllers
12 pages, 7 figures. Accepted for Workshop on Large-Scale Parallel Processing 2008. Revised and extended version
null
null
null
cs.DC cs.PF
null
Processor and system architectures that feature multiple memory controllers are prone to show bottlenecks and erratic performance numbers on codes with regular access patterns. Although such effects are well known in the form of cache thrashing and aliasing conflicts, they become more severe when memory access is involved. Using the new Sun UltraSPARC T2 processor as a prototypical multi-core design, we analyze performance patterns in low-level and application benchmarks and show ways to circumvent bottlenecks by careful data layout and padding.
[ { "version": "v1", "created": "Fri, 14 Dec 2007 08:14:20 GMT" }, { "version": "v2", "created": "Mon, 28 Jan 2008 16:18:50 GMT" } ]
2008-01-28T00:00:00
[ [ "Hager", "Georg", "" ], [ "Zeiser", "Thomas", "" ], [ "Wellein", "Gerhard", "" ] ]
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712.2303
Attila Popping
Attila Popping and Robert Braun
The Standing Wave Phenomenon in Radio Telescopes; Frequency Modulation of the WSRT Primary Beam
12 pages, 11 figures, Accepted for publication in A&A, figures compressed to low resolution; high-resolution version available at: http://www.astro.rug.nl/~popping/wsrtbeam.pdf
null
10.1051/0004-6361:20079122
null
astro-ph
null
Inadequacies in the knowledge of the primary beam response of current interferometric arrays often form a limitation to the image fidelity. We hope to overcome these limitations by constructing a frequency-resolved, full-polarization empirical model for the primary beam of the Westerbork Synthesis Radio Telescope (WSRT). Holographic observations, sampling angular scales between about 5 arcmin and 11 degrees, were obtained of a bright compact source (3C147). These permitted measurement of voltage response patterns for seven of the fourteen telescopes in the array and allowed calculation of the mean cross-correlated power beam. Good sampling of the main-lobe, near-in, and far-side-lobes out to a radius of more than 5 degrees was obtained. A robust empirical beam model was detemined in all polarization products and at frequencies between 1322 and 1457 MHz with 1 MHz resolution. Substantial departures from axi-symmetry are apparent in the main-lobe as well as systematic differences between the polarization properties. Surprisingly, many beam properties are modulated at the 5 to 10% level with changing frequency. These include: (1) the main beam area, (2) the side-lobe to main-lobe power ratio, and (3) the effective telescope aperture. These semi-sinusoidsal modulations have a basic period of about 17 MHz, consistent with the natural 'standing wave' period of a 8.75 m focal distance. The deduced frequency modulations of the beam pattern were verified in an independent long duration observation using compact continuum sources at very large off-axis distances. Application of our frequency-resolved beam model should enable higher dynamic range and improved image fidelity for interferometric observations in complex fields. (abridged)
[ { "version": "v1", "created": "Fri, 14 Dec 2007 09:24:46 GMT" } ]
2009-11-13T00:00:00
[ [ "Popping", "Attila", "" ], [ "Braun", "Robert", "" ] ]
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712.2304
Damien Roy
Damien Roy
On simultaneous rational approximations to a real number, its square, and its cube
12 pages
Acta Arithmetica, vol.133 (2008), 185-197
10.4064/aa133-2-6
null
math.NT
null
We provide an upper bound on the uniform exponent of approximation to a triple (xi, xi^2, xi^3) by rational numbers with the same denominator, valid for any transcendental real number xi. This upper bound refines a previous result of Davenport and Schmidt. As a consequence, we get a sharper lower bound on the exponent of approximation of such a number xi by algebraic integers of degree at most 4.
[ { "version": "v1", "created": "Fri, 14 Dec 2007 18:42:26 GMT" }, { "version": "v2", "created": "Sat, 15 Dec 2007 19:47:41 GMT" } ]
2015-05-13T00:00:00
[ [ "Roy", "Damien", "" ] ]
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712.2305
Eugene Kamenetskii
M. Sigalov, E.O. Kamenetskii, and R. Shavit
Electric self inductance of quasi-2D magnetic-dipolar-mode ferrite disks
null
J. Appl. Phys. 104, 053901 (2008)
10.1063/1.2973676
null
cond-mat.mtrl-sci cond-mat.mes-hall
null
An electric current flowing around a loop produces a magnetic field and hence a magnetic flux through the loop. The ratio of the magnetic flux to the electric current is called the (magnetic) self inductance. Can there be a dual situation with a magnetic current flowing around a loop and producing an electric field and hence an electric flux through the loop? Following the classical electrodynamics laws an answer to this question should be negative. Nevertheless special spectral properties of magnetic dipolar modes in a quasi-2D ferrite disk show there are the double-valued-function loop magnetic currents which may produce eigen electric fields and hence eigen electric fluxes through the loop. In this case one can definitely introduce the notion of the electric self inductance as the ratio of the electric flux to the magnetic current. In this paper we show experimentally that in the magnetic-dipolar-mode ferrite disks there exist eigen electric fluxes. These fluxes are very sensitive to permittivity parameters of materials abutting to the ferrite disk. Dielectric samples above a ferrite disk with a higher permittivity than air confine the electric field closely outside the ferrite, thereby changing the loop magnetic currents and thus transforming the magnetic-dipolar-mode oscillating spectrum.
[ { "version": "v1", "created": "Fri, 14 Dec 2007 08:56:11 GMT" } ]
2009-11-13T00:00:00
[ [ "Sigalov", "M.", "" ], [ "Kamenetskii", "E. O.", "" ], [ "Shavit", "R.", "" ] ]
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712.2306
Phuong Mai Dinh
J. Messud, P. M. Dinh, P.-G. Reinhard, and E. Suraud
Time-dependent density-functional theory with self-interaction correction
4 pages, 1 figure
Phys. Rev. Lett. 101 (2008) 096404
10.1103/PhysRevLett.101.096404
null
cond-mat.other
null
We discuss an extension of time-dependent density-functional theory by a self-interaction correction (SIC). A strictly variational formulation is given taking care of the necessary constraints. A manageable and transparent propagation scheme using two sets of wavefunctions is proposed and applied to laser excitation with subsequent ionization of a dimer molecule.
[ { "version": "v1", "created": "Fri, 14 Dec 2007 09:05:26 GMT" }, { "version": "v2", "created": "Fri, 4 Apr 2008 10:01:14 GMT" } ]
2009-11-13T00:00:00
[ [ "Messud", "J.", "" ], [ "Dinh", "P. M.", "" ], [ "Reinhard", "P. -G.", "" ], [ "Suraud", "E.", "" ] ]
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712.2307
Valerio Scarani
Valerio Scarani (CQT Singapore)
On the local and non-local content of bipartite qubit and qutrit correlations
Accepted version. Previous title "The Elitzur-Popescu-Rohrlich approach to quantum non-locality" changed for editorial reasons
Phys. Rev. A 77, 042112 (2008)
10.1103/PhysRevA.77.042112
null
quant-ph
null
The local and non-local contents of non-local probability distributions are studied using the approach of Elitzur, Popescu and Rohrlich [Phys. Lett. A \textbf{162}, 25 (1992)]. This work focuses on distributions that can be obtained by single-copy von Neumann measurements on bipartite quantum systems. For pure two-qubit states Psi(theta)=cos(theta)|00>+sin(theta)|11>, with cos(theta)>=sin(theta), the local content of the corresponding probability distribution is found to lie between 1-sin(2*theta) and cos(2*theta). For the family Psi(gamma)= (|00>+|11>+gamma*|22>)/sqrt(2+gamma^2) of two-qutrit states, non-zero local content is found for gamma>2.
[ { "version": "v1", "created": "Fri, 14 Dec 2007 09:11:30 GMT" }, { "version": "v2", "created": "Tue, 8 Apr 2008 03:30:59 GMT" } ]
2009-11-13T00:00:00
[ [ "Scarani", "Valerio", "", "CQT Singapore" ] ]
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712.2308
Xinxian Zheng
J\"urgen Herzog, Marius Vladoiu and Xinxian Zheng
How to compute the Stanley depth of a monomial ideal
null
null
null
null
math.AC
null
Let $J\subset I$ be monomial ideals. We show that the Stanley depth of $I/J$ can be computed in a finite number of steps. We also introduce the $\fdepth$ of a monomial ideal which is defined in terms of prime filtrations and show that it can also be computed in a finite number of steps. In both cases it is shown that these invariants can be determined by considering partitions of suitable finite posets into intervals.
[ { "version": "v1", "created": "Fri, 14 Dec 2007 09:11:39 GMT" } ]
2007-12-17T00:00:00
[ [ "Herzog", "Jürgen", "" ], [ "Vladoiu", "Marius", "" ], [ "Zheng", "Xinxian", "" ] ]
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712.2309
Shrisha Rao
Jeremiah Barr, Shrisha Rao
The $n$-Queens Problem in Higher Dimensions
null
Elemente der Mathematik 61 (4), 2006, pp. 133--137
null
null
math.CO
null
A well-known chessboard problem is that of placing eight queens on the chessboard so that no two queens are able to attack each other. (Recall that a queen can attack anything on the same row, column, or diagonal as itself.) This problem is known to have been studied by Gauss, and can be generalized to an (n \times n) board, where (n \geq 4). We consider this problem in $d$-dimensional chess spaces, where (d \geq 3), and obtain the result that in higher dimensions, $n$ queens do not always suffice (in any arrangement) to attack all board positions. Our methods allow us to obtain the first lower bound on the number of queens that are necessary to attack all positions in a $d$-dimensional chess space of size $n$, and further to show that for any $k$, there are higher-dimensional chess spaces in which not all positions can be attacked by (n^k) queens.
[ { "version": "v1", "created": "Fri, 14 Dec 2007 09:17:04 GMT" } ]
2007-12-17T00:00:00
[ [ "Barr", "Jeremiah", "" ], [ "Rao", "Shrisha", "" ] ]
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712.231
Thomas Oikonomou
Thomas Oikonomou
From Boltzmann-Gibbs ensemble to generalized ensembles
This paper has been withdrawn by the author
null
null
null
cond-mat.stat-mech
null
We reconsider the Boltzmann-Gibbs statistical ensemble in thermodynamics using the multinomial coefficient approach. We show that an ensemble is defined by the determination of four statistical quantities, the element probabilities $p_i$, the configuration probabilities $P_j$, the entropy $S$ and the extremum constraints (EC). This distinction is of central importance for the understanding of the conditions under which a microcanonical, canonical and macrocanonical ensemble is defined. These three ensembles are characterized by the conservation of their sizes. A variation of the ensemble size creates difficulties in the definitions of the quadruplet $\{p_i, P_j, S, \mt{EC}\}$, giving rise for a generalization of the Boltzmann-Gibbs formalism, such one as introduced by Tsallis. We demonstrate that generalized thermodynamics represent a transformation of ordinary thermodynamics in such a way that the energy of the system remains conserved. From our results it becomes evident that Tsallis's formalism is a very specific generalization, however, not the only one. We also revisit the Jaynes's Maximum Entropy Principle, showing that in general it can lead to incorrect results and consider the appropriate corrections.
[ { "version": "v1", "created": "Fri, 14 Dec 2007 09:18:24 GMT" }, { "version": "v2", "created": "Thu, 17 Jan 2008 10:42:36 GMT" }, { "version": "v3", "created": "Sat, 27 Aug 2011 11:54:56 GMT" } ]
2011-08-30T00:00:00
[ [ "Oikonomou", "Thomas", "" ] ]
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712.2311
Christoph Bohle
C. Bohle, K. Leschke, F. Pedit, U. Pinkall
Conformal maps from a 2-torus to the 4-sphere
27 pages, 5 figures
J. Reine Angew. Math. 671 (2012), 1-30
10.1515/CRELLE.2011.156
null
math.DG
null
We study the space of conformal immersions of a 2-torus into the 4-sphere. The moduli space of generalized Darboux transforms of such an immersed torus has the structure of a Riemann surface, the spectral curve. This Riemann surface arises as the zero locus of the determinant of a holomorphic family of Dirac type operators parameterized over the complexified dual torus. The kernel line bundle of this family over the spectral curve describes the generalized Darboux transforms of the conformally immersed torus. If the spectral curve has finite genus the kernel bundle can be extended to the compactification of the spectral curve and we obtain a linear 2-torus worth of algebraic curves in projective 3-space. The original conformal immersion of the 2-torus is recovered as the orbit under this family of the point at infinity on the spectral curve projected to the 4-sphere via the twistor fibration.
[ { "version": "v1", "created": "Fri, 14 Dec 2007 09:46:54 GMT" } ]
2012-12-21T00:00:00
[ [ "Bohle", "C.", "" ], [ "Leschke", "K.", "" ], [ "Pedit", "F.", "" ], [ "Pinkall", "U.", "" ] ]
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712.2312
Roberto Lineros
T. Delahaye (1), R. Lineros (2), F. Donato (2), N. Fornengo (2), P. Salati (1) ((1) LAPTH/Annecy, CNRS-SPM and Universite' de Savoie 9, (2) University of Torino and INFN/Torino)
Positrons from dark matter annihilation in the galactic halo: theoretical uncertainties
22 pages, 15 figures. A few comments and references added
Phys.Rev.D77:063527,2008
10.1103/PhysRevD.77.063527
DFTT 7/2007, LAPTH-1187/07
astro-ph hep-ph
null
Indirect detection signals from dark matter annihilation are studied in the positron channel. We discuss in detail the positron propagation inside the galactic medium: we present novel solutions of the diffusion and propagation equations and we focus on the determination of the astrophysical uncertainties which affect the positron dark matter signal. We find dark matter scenarios and propagation models that nicely fit existing data on the positron fraction. Finally, we present predictions both on the positron fraction and on the flux for already running or planned space experiments, concluding that they have the potential to discriminate a possible signal from the background and, in some cases, to distinguish among different astrophysical propagation models.
[ { "version": "v1", "created": "Fri, 14 Dec 2007 09:34:10 GMT" }, { "version": "v2", "created": "Sat, 9 Feb 2008 16:35:42 GMT" } ]
2010-04-06T00:00:00
[ [ "Delahaye", "T.", "" ], [ "Lineros", "R.", "" ], [ "Donato", "F.", "" ], [ "Fornengo", "N.", "" ], [ "Salati", "P.", "" ] ]
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712.2313
Felix H\"ofling
Felix H\"ofling, Tobias Munk, Erwin Frey, and Thomas Franosch
Critical dynamics of ballistic and Brownian particles in a heterogeneous environment
14 pages
J. Chem. Phys. 128, 164517 (2008)
10.1063/1.2901170
LMU-ASC 77/07
cond-mat.soft cond-mat.stat-mech
null
The dynamic properties of a classical tracer particle in a random, disordered medium are investigated close to the localization transition. For Lorentz models obeying Newtonian and diffusive motion at the microscale, we have performed large-scale computer simulations, demonstrating that universality holds at long times in the immediate vicinity of the transition. The scaling function describing the crossover from anomalous transport to diffusive motion is found to vary extremely slowly and spans at least 5 decades in time. To extract the scaling function, one has to allow for the leading universal corrections to scaling. Our findings suggest that apparent power laws with varying exponents generically occur and dominate experimentally accessible time windows as soon as the heterogeneities cover a decade in length scale. We extract the divergent length scales, quantify the spatial heterogeneities in terms of the non-Gaussian parameter, and corroborate our results by a thorough finite-size analysis.
[ { "version": "v1", "created": "Fri, 14 Dec 2007 09:58:23 GMT" } ]
2008-04-29T00:00:00
[ [ "Höfling", "Felix", "" ], [ "Munk", "Tobias", "" ], [ "Frey", "Erwin", "" ], [ "Franosch", "Thomas", "" ] ]
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712.2314
Erik Dujardin
Jean-Francois Dayen, Ather Mahmood, Dmitry S. Golubev, Isabelle Roch-Jeune, Philippe Salles and Erik Dujardin
Side-gated transport in FIB-fabricated multilayered graphene nanoribbons
Revised version: more detailed description of control experiments. 5 pages, 4 figures, submitted to Small (Wiley-VCH). Added supporting information (Figs S1 to S8)
Small, 2008, 4, 716-720
10.1002/smll.200700913
null
cond-mat.mtrl-sci
null
In this Letter, we present the patterning, exfoliation and micromanipulation of thin graphitic discs which are subsequently connected and patterned into sub-100nm wide ribbons with a resist-free process using Focused Ion Beam (FIB) lithography and deposition. The electronic transport properties of the double side-gated nanoribbons are then investigated down to 40 K and interpreted with a simple model of 1D array of tunnelling junctions.
[ { "version": "v1", "created": "Fri, 14 Dec 2007 09:47:13 GMT" }, { "version": "v2", "created": "Sat, 26 Jan 2008 23:47:07 GMT" } ]
2010-11-22T00:00:00
[ [ "Dayen", "Jean-Francois", "" ], [ "Mahmood", "Ather", "" ], [ "Golubev", "Dmitry S.", "" ], [ "Roch-Jeune", "Isabelle", "" ], [ "Salles", "Philippe", "" ], [ "Dujardin", "Erik", "" ] ]
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712.2315
Vadim Puller
Vadim I. Puller, Yigal Meir
Phase switching in a voltage-biased Aharonov-Bohm interferometer
12 pages, 9 figures
null
10.1103/PhysRevB.77.165421
null
cond-mat.mes-hall
null
Recent experiment [Sigrist et al., Phys. Rev. Lett. {\bf 98}, 036805 (2007)] reported switches between 0 and $\pi$ in the phase of Aharonov-Bohm oscillations of the two-terminal differential conductance through a two-dot ring with increasing voltage bias. Using a simple model, where one of the dots contains multiple interacting levels, these findings are explained as a result of transport through the interferometer being dominated at different biases by quantum dot levels of different "parity" (i.e. the sign of the overlap integral between the dot state and the states in the leads). The redistribution of electron population between different levels with bias leads to the fact that the number of switching events is not necessarily equal to the number of dot levels, in agreement with experiment. For the same reason switching does not always imply that the parity of levels is strictly alternating. Lastly, it is demonstrated that the correlation between the first switching of the phase and the onset of the inelastic cotunneling, as well as the sharp (rather than gradual) change of phase when switching occurs, give reason to think that the present interpretation of the experiment is preferable to the one based on electrostatic AB effect.
[ { "version": "v1", "created": "Fri, 14 Dec 2007 09:49:09 GMT" } ]
2009-11-13T00:00:00
[ [ "Puller", "Vadim I.", "" ], [ "Meir", "Yigal", "" ] ]
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712.2316
Hiroshi Itoyama
H.Itoyama and A.Morozov
Boundary Ring or a Way to Construct Approximate NG Solutions with Polygon Boundary Conditions. II. Polygons which admit an inscribed circle
45 pages
Prog.Theor.Phys.120:231-287,2008
10.1143/PTP.120.231
OCU-PHYS 284, ITEP/TH-58/07
hep-th
null
We further develop the formalism of arXiv:0712.0159 for approximate solution of Nambu-Goto (NG) equations with polygon conditions in AdS backgrounds, needed in modern studies of the string/gauge duality. Inscribed circle condition is preserved, which leaves only one unknown function y_0(y_1,y_2) to solve for, what considerably simplifies our presentation. The problem is to find a delicate balance -- if not exact match -- between two different structures: NG equation -- a non-linear deformation of Laplace equation with solutions non-linearly deviating from holomorphic functions, -- and the boundary ring, associated with polygons made from null segments in Minkovski space. We provide more details about the theory of these structures and suggest an extended class of functions to be used at the next stage of Alday-Maldacena program: evaluation of regularized NG actions.
[ { "version": "v1", "created": "Fri, 14 Dec 2007 10:15:16 GMT" } ]
2008-11-26T00:00:00
[ [ "Itoyama", "H.", "" ], [ "Morozov", "A.", "" ] ]
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712.2317
Laurent Duval
Caroline Chaux, Laurent Duval, Amel Benazza-Benyahia and Jean-Christophe Pesquet
A nonlinear Stein based estimator for multichannel image denoising
null
null
10.1109/TSP.2008.921757
null
physics.data-an stat.AP
null
The use of multicomponent images has become widespread with the improvement of multisensor systems having increased spatial and spectral resolutions. However, the observed images are often corrupted by an additive Gaussian noise. In this paper, we are interested in multichannel image denoising based on a multiscale representation of the images. A multivariate statistical approach is adopted to take into account both the spatial and the inter-component correlations existing between the different wavelet subbands. More precisely, we propose a new parametric nonlinear estimator which generalizes many reported denoising methods. The derivation of the optimal parameters is achieved by applying Stein's principle in the multivariate case. Experiments performed on multispectral remote sensing images clearly indicate that our method outperforms conventional wavelet denoising techniques
[ { "version": "v1", "created": "Fri, 14 Dec 2007 10:27:16 GMT" } ]
2023-01-19T00:00:00
[ [ "Chaux", "Caroline", "" ], [ "Duval", "Laurent", "" ], [ "Benazza-Benyahia", "Amel", "" ], [ "Pesquet", "Jean-Christophe", "" ] ]
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712.2318
Makoto Sakurai
Makoto Sakurai
Mixed anomalies of chiral algebras compactified to smooth quasi-projective surfaces
Ph.D. dissertation at the University of Tokyo, 2007, v2. changed the arXiv address of reference, v3. eliminated some typos and references, v4. introduced AMS format of LaTeX, v5. cleaned signs, fonts, and formats with polite calculations
null
null
UT-07-39
hep-th math.AG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Some time ago, the chiral algebra theory of Beilinson-Drinfeld was expected to play a central role in the convergence of divergence in mathematical physics of superstring theory for quantization of gauge theory and gravity. Naively, this algebra plays an important role in a holomorphic conformal field theory with a non-negative integer graded conformal dimension, whose target space does not necessarily have the vanishing first Chern class. This algebra has two definitions until now: one is that by Malikov-Schechtman-Vaintrob by gluing affine patches, and the other is that of Kapranov-Vasserot by gluing the formal loop spaces. I will use the new definition of Nekrasov by simplifying Malikov-Schechtman-Vaintrob in order to compute the obstruction classes of gerbes of chiral differential operators. In this paper, I will examine the two independent Ans$\"{a}$tze (or working hypotheses) of Witten's $\mathcal{N}=(0,2)$ heterotic strings and Nekrasov's generalized complex geometry, after Hitchin and Gualtieri, are consistent in the case of $\mathbb{CP}^2$, which has $3$ affine patches and is expected to have the "first Pontryagin anomaly". I also scrutinized the physical meanings of $2$ dimensional toric Fano manifolds, or rather toric del Pezzo surfaces, obtained by blowing up the non-colinear $1, 2, 3$ points of $\mathbb{CP}^2$. The obstruction classes of gerbes of them coincide with the second Chern characters obtained by the Riemann-Roch theorem and in particular vanishes for $1$ point blowup, which means that one of the gravitational anomalies vanishes for a non-Calabi-Yau manifold compactification. The future direction towards the geometric Langlands program is also discussed in the last section.
[ { "version": "v1", "created": "Fri, 14 Dec 2007 11:45:58 GMT" }, { "version": "v2", "created": "Sun, 16 Dec 2007 08:21:41 GMT" }, { "version": "v3", "created": "Wed, 19 Sep 2012 00:31:55 GMT" }, { "version": "v4", "created": "Thu, 13 Dec 2012 07:11:35 GMT" }, { "version": "v5", "created": "Wed, 25 Feb 2015 04:49:50 GMT" } ]
2015-02-26T00:00:00
[ [ "Sakurai", "Makoto", "" ] ]
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712.2319
Jens Mueller
Jens Mueller, Steffen Wirth, Stephan von Molnar
Room-temperature magnetoresistance switching of Py thin films induced by Fe-nanoparticles grown by STM-assisted CVD
null
null
null
null
cond-mat.other
null
Arrays of Fe-nanoparticles grown by STM-assited CVD have been placed on top of a narrow stripe of Py. The magnetic coupling between the nanoparticles and the underlying Py film results in distinct negative jumps of the Py magnetoresistance. The switching of the magnetization orientation of individual particles is clearly reflected in the Py magnetoresistance as a consequence of AMR and DWMR, with a homogeneous particle magnetization orientation yielding the highest resistances.
[ { "version": "v1", "created": "Fri, 14 Dec 2007 10:38:08 GMT" }, { "version": "v2", "created": "Mon, 17 Dec 2007 10:37:29 GMT" } ]
2007-12-17T00:00:00
[ [ "Mueller", "Jens", "" ], [ "Wirth", "Steffen", "" ], [ "von Molnar", "Stephan", "" ] ]
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712.232
Ernst Heintze
Ernst Heintze (Augsburg)
Real forms and finite order automorphisms of affine Kac-Moody algebras - an outline of a new approach
13 pages. To appear in RIMS Kokyuroku
null
null
null
math.RA math.MG
null
We outline a new approach to classify real forms and automorphisms of finite order of affine Kac-Moody algebras.
[ { "version": "v1", "created": "Fri, 14 Dec 2007 10:25:40 GMT" } ]
2007-12-17T00:00:00
[ [ "Heintze", "Ernst", "", "Augsburg" ] ]
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712.2321
Euro Spallucci
Patricio Gaete, Euro Spallucci
Remarks on confinement driven by axion-like particles in Yang-Mills theories
8 pages, Latex; typos corrected; presentation improved; 2 references added
J.Phys.A41:185401,2008
10.1088/1751-8113/41/18/185401
USM-TH-233
hep-th
null
Features of screening and confinement are studied for a non-Abelian gauge theory with a mixture of pseudoscalar and scalar coupling, in the case where a constant chromo-electric, or chromo-magnetic, strength expectation value is present. Our discussion is carried out using the gauge-invariant but path-dependent variables formalism. We explicitly show that the static potential profile is the sum of a Yukawa and a linear potential, leading to the confinement of static probe charges. Interestingly, similar results have been obtained in the context of gluodynamics in curved space-time. For only pseudoscalar coupling, the results are radically different.
[ { "version": "v1", "created": "Fri, 14 Dec 2007 10:46:33 GMT" }, { "version": "v2", "created": "Mon, 17 Mar 2008 09:33:41 GMT" } ]
2008-11-26T00:00:00
[ [ "Gaete", "Patricio", "" ], [ "Spallucci", "Euro", "" ] ]
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712.2322
Faustino Palmero
F. Palmero, R. Carretero-Gonz\'alez, J. Cuevas, P.G. Kevrekidis and W. Kr\'olikowski
Solitons in one-dimensional nonlinear Schr\"{o}dinger lattices with a local inhomogeneity
12 pages, 10 figures
null
10.1103/PhysRevE.77.036614
null
nlin.PS
null
In this paper we analyze the existence, stability, dynamical formation and mobility properties of localized solutions in a one-dimensional system described by the discrete nonlinear Schr\"{o}dinger equation with a linear point defect. We consider both attractive and repulsive defects in a focusing lattice. Among our main findings are: a) the destabilization of the on--site mode centered at the defect in the repulsive case; b) the disappearance of localized modes in the vicinity of the defect due to saddle-node bifurcations for sufficiently strong defects of either type; c) the decrease of the amplitude formation threshold for attractive and its increase for repulsive defects; and d) the detailed elucidation as a function of initial speed and defect strength of the different regimes (trapping, trapping and reflection, pure reflection and pure transmission) of interaction of a moving localized mode with the defect.
[ { "version": "v1", "created": "Fri, 14 Dec 2007 11:27:20 GMT" } ]
2008-03-31T00:00:00
[ [ "Palmero", "F.", "" ], [ "Carretero-González", "R.", "" ], [ "Cuevas", "J.", "" ], [ "Kevrekidis", "P. G.", "" ], [ "Królikowski", "W.", "" ] ]
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712.2323
Gerald Teschl
Michael Schmied, Robert Sims, and Gerald Teschl
On the Absolutely Continuous Spectrum of Sturm-Liouville Operators with Applications to Radial Quantum Trees
16 pages
Oper. Matrices 2:3, 417-434 (2008)
10.7153/oam-02-25
null
math.SP math-ph math.MP
null
We consider standard subordinacy theory for general Sturm--Liouville operators and give criteria when boundedness of solutions implies that no subordinate solutions exist. As applications, we prove a Weidmann-type result for general Sturm--Liouville operators and investigate the absolutely continuous spectrum of radially symmetric quantum trees.
[ { "version": "v1", "created": "Fri, 14 Dec 2007 11:32:08 GMT" }, { "version": "v2", "created": "Wed, 12 Mar 2008 10:01:56 GMT" } ]
2013-11-28T00:00:00
[ [ "Schmied", "Michael", "" ], [ "Sims", "Robert", "" ], [ "Teschl", "Gerald", "" ] ]
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712.2324
Andrej Vilfan
Andrej Vilfan
Myosin V passing over Arp2/3 junctions: branching ratio calculated from the elastic lever arm model
9 pages, 7 figures, to appear in Biophysical Journal
Biophys. J. 94, 3405-3412 (2008)
10.1529/biophysj.107.120568
null
physics.bio-ph cond-mat.soft q-bio.BM
null
Myosin V is a two-headed processive motor protein that walks in a hand-over-hand fashion along actin filaments. When it encounters a filament branch, formed by the Arp2/3 complex, it can either stay on the straight mother filament, or switch to the daughter filament. We study both probabilities using the elastic lever arm model for myosin V. We calculate the shapes and bending energies of all relevant configurations in which the trail head is bound to the actin filament before Arp2/3 and the lead head is bound either to the mother or to the daughter filament. Based on the assumption that the probability for a head to bind to a certain actin subunit is proportional to the Boltzmann factor obtained from the elastic energy, we calculate the mother/daughter filament branching ratio. Our model predicts a value of 27% for the daughter and 73% for the mother filament. This result is in good agreement with recent experimental data.
[ { "version": "v1", "created": "Fri, 14 Dec 2007 11:32:20 GMT" } ]
2008-04-03T00:00:00
[ [ "Vilfan", "Andrej", "" ] ]
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712.2325
Cosima Schuster
U. Schwingenschloegl and C. Schuster
Confined Ge-Pt states in self-organized Pt nanowire arrays on Ge(001)
3 pages, 3 figures, accepted by Eur. Phys. J. B
The European Physical Journal B 60, 409-411 (2007)
10.1140/epjb/e2008-00019-y
null
cond-mat.mes-hall
null
By means of band structure calculations within the density functional theory and the generalized gradient approximation, we investigate the electronic structure of self-organized Pt nanowires on the Ge(001) surface. In particular, we deal with a novel one-dimensional surface state confined in the nanowire array and clarify its origin. Due to large Pt contributions, the novel state is rather a mixed Ge-Pt hybrid state than a confined Ge surface state. Moreover, we compare our results to data from scanning tunneling microscopy.
[ { "version": "v1", "created": "Fri, 14 Dec 2007 11:39:46 GMT" } ]
2009-11-13T00:00:00
[ [ "Schwingenschloegl", "U.", "" ], [ "Schuster", "C.", "" ] ]
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712.2326
Dominique Eckert M.
D. Eckert, N. Produit, S. Paltani, A. Neronov, T. J.-L. Courvoisier
INTEGRAL discovery of non-thermal hard X-ray emission from the Ophiuchus cluster
8 pages, 9 figures, accepted by A&A
null
10.1051/0004-6361:20078853
null
astro-ph
null
We present the results of deep observations of the Ophiuchus cluster of galaxies with INTEGRAL in the 3-80 keV band. We analyse 3 Ms of INTEGRAL data on the Ophiuchus cluster with the IBIS/ISGRI hard X-ray imager and the JEM-X X-ray monitor. In the X-ray band using JEM-X, we show that the source is extended, and that the morphology is compatible with the results found by previous missions. Above 20 keV, we show that the size of the source is slightly larger than the PSF of the instrument, and is consistent with the soft X-ray morphology found with JEM-X and ASCA. Thanks to the constraints on the temperature provided by JEM-X, we show that the spectrum of the cluster is not well fitted by a single-temperature thermal Bremsstrahlung model, and that another spectral component is needed to explain the high energy data. We detect the high energy tail with a higher detection significance (6.4 sigma) than the BeppoSAX claim (2 sigma). Because of the imaging capabilities of JEM-X and ISGRI, we are able to exclude the possibility that the excess emission comes from very hot regions or absorbed AGN, which proves that the excess emission is indeed of non-thermal origin. Using the available radio data together with the non-thermal hard X-ray flux, we estimate a magnetic field B ~ 0.1-0.2 mu G.
[ { "version": "v1", "created": "Fri, 14 Dec 2007 11:41:25 GMT" } ]
2009-11-13T00:00:00
[ [ "Eckert", "D.", "" ], [ "Produit", "N.", "" ], [ "Paltani", "S.", "" ], [ "Neronov", "A.", "" ], [ "Courvoisier", "T. J. -L.", "" ] ]
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712.2327
Lothar Tiator
B. Pasquini (Pavia), D. Drechsel, L. Tiator (Mainz)
Invariant Amplitudes for Pion Electroproduction
18 pages, 8 figures
Eur.Phys.J.A34:387-403,2007
10.1140/epja/i2007-10510-7
null
hep-ph nucl-th
null
The invariant amplitudes for pion electroproduction on the nucleon are evaluated by dispersion relations at constant t with MAID as input for the imaginary parts of these amplitudes. In the threshold region these amplitudes are confronted with the predictions of several low-energy theorems derived in the soft-pion limit. In general agreement with Chiral Perturbation Theory, the dispersive approach yields large corrections to these theorems because of the finite pion mass.
[ { "version": "v1", "created": "Fri, 14 Dec 2007 11:58:00 GMT" } ]
2008-11-26T00:00:00
[ [ "Pasquini", "B.", "", "Pavia" ], [ "Drechsel", "D.", "", "Mainz" ], [ "Tiator", "L.", "", "Mainz" ] ]
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712.2328
Erwan Deriaz M
Erwan Deriaz
$L^2$-stability of explicit schemes for incompressible Euler equations
6 pages
null
null
null
math.NA
null
We present an original study on the numerical stabiliy of explicit schemes solving the incompressible Euler equations on an open domain with slipping boundary conditions. Relying on the skewness property of the non-linear term, we demonstrate that some explicit schemes are numerically stable for small perturbations under the condition $\delta t\leq C \delta x^{2r/(2r-1)}$ where $r$ is an integer, $\delta t$ the time step and $\delta x$ the space step.
[ { "version": "v1", "created": "Fri, 14 Dec 2007 12:01:32 GMT" } ]
2007-12-17T00:00:00
[ [ "Deriaz", "Erwan", "" ] ]
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712.2329
Mahender Singh
Mahender Singh
Fixed points of circle actions on spaces with rational cohomology of $S^n V S^{2n} V S^{3n}$ or $P^2(n) V S^{3n}$
10 pages, appeared in Archiv der Mathematik
Archiv der Mathematik, 92 (2009), 174-183
10.1007/s00013-009-2792-3
null
math.AT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Let $X$ be a finitistic space with its rational cohomology isomorphic to that of the wedge sum $P^2(n)\vee S^{3n} $ or $S^{n} \vee S^{2n}\vee S^{3n}$. We study continuous $\mathbb{S}^1$ actions on $X$ and determine the possible fixed point sets up to rational cohomology depending on whether or not $X$ is totally non-homologous to zero in $X_{\mathbb{S}^1}$ in the Borel fibration $X\hookrightarrow X_{\mathbb{S}^1} \longrightarrow B_{\mathbb{S}^1}$. We also give examples realizing the possible cases.
[ { "version": "v1", "created": "Fri, 14 Dec 2007 12:02:12 GMT" }, { "version": "v2", "created": "Fri, 28 Dec 2007 09:18:21 GMT" }, { "version": "v3", "created": "Fri, 27 Mar 2009 08:44:35 GMT" }, { "version": "v4", "created": "Tue, 28 Sep 2010 04:22:44 GMT" } ]
2010-09-29T00:00:00
[ [ "Singh", "Mahender", "" ] ]
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712.233
Alessandro Giuliani
Alessandro Giuliani, Joel L. Lebowitz, Elliott H. Lieb
Periodic minimizers in 1D local mean field theory
20 pages, 2 figures
Comm. Math. Phys. 286, 163-177 (2009)
10.1007/s00220-008-0589-z
null
math-ph cond-mat.stat-mech math.MP
null
Using reflection positivity techniques we prove the existence of minimizers for a class of mesoscopic free-energies representing 1D systems with competing interactions. All minimizers are either periodic, with zero average, or of constant sign. If the local term in the free energy satisfies a convexity condition, then all minimizers are either periodic or constant. Examples of both phenomena are given. This extends our previous work where such results were proved for the ground states of lattice systems with ferromagnetic nearest neighbor interactions and dipolar type antiferromagnetic long range interactions.
[ { "version": "v1", "created": "Fri, 14 Dec 2007 12:03:09 GMT" } ]
2011-09-09T00:00:00
[ [ "Giuliani", "Alessandro", "" ], [ "Lebowitz", "Joel L.", "" ], [ "Lieb", "Elliott H.", "" ] ]
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712.2331
Andrey Milchev
D. I. Dimitrov, A. Milchev, and K. Binder
Forced Imbibition - a Tool for Determining Laplace Pressure, Drag Force and Slip Length in Capillary Filling Experiments
4 pages, 5 figures
null
10.1039/b719248g
null
physics.flu-dyn physics.comp-ph
null
When a very thin capillary is inserted into a liquid, the liquid is sucked into it: this imbibition process is controlled by a balance of capillary and drag forces, which are hard to quantify experimentally, in particularly considering flow on the nanoscale. By computer experiments using a generic coarse-grained model, it is shown that an analysis of imbibition forced by a controllable external pressure quantifies relevant physical parameter such as the Laplace pressure, Darcy's permeability, effective pore radius, effective viscosity, dynamic contact angle and slip length of the fluid flowing into the pore. In determining all these parameters independently, the consistency of our analysis of such forced imbibition processes is demonstrated.
[ { "version": "v1", "created": "Fri, 14 Dec 2007 12:11:00 GMT" } ]
2019-02-20T00:00:00
[ [ "Dimitrov", "D. I.", "" ], [ "Milchev", "A.", "" ], [ "Binder", "K.", "" ] ]
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712.2332
Jose Luis Jaramillo
J.L. Jaramillo, J.A. Valiente Kroon and E. Gourgoulhon
From Geometry to Numerics: interdisciplinary aspects in mathematical and numerical relativity
Topical review commissioned by Classical and Quantum Gravity. Discussion inspired by the workshop "From Geometry to Numerics" (Paris, 20-24 November, 2006), part of the "General Relativity Trimester" at the Institut Henri Poincare (Fall 2006). Comments and references added. Typos corrected. Submitted to Classical and Quantum Gravity
Class.Quant.Grav.25:093001,2008
10.1088/0264-9381/25/9/093001
null
gr-qc
null
This article reviews some aspects in the current relationship between mathematical and numerical General Relativity. Focus is placed on the description of isolated systems, with a particular emphasis on recent developments in the study of black holes. Ideas concerning asymptotic flatness, the initial value problem, the constraint equations, evolution formalisms, geometric inequalities and quasi-local black hole horizons are discussed on the light of the interaction between numerical and mathematical relativists.
[ { "version": "v1", "created": "Fri, 14 Dec 2007 12:20:54 GMT" }, { "version": "v2", "created": "Wed, 30 Jan 2008 17:38:11 GMT" } ]
2008-11-26T00:00:00
[ [ "Jaramillo", "J. L.", "" ], [ "Kroon", "J. A. Valiente", "" ], [ "Gourgoulhon", "E.", "" ] ]
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712.2333
Mayra Osorio
Mayra Osorio
Models for Dust and Molecular Emission of High-Mass Protostars
8 pages, 5 figures. Conference: "Massive Star Formation: Observations confront Theory" 2007, Heidelberg Germany. To appear in Astronomical Society of the Pacific
null
null
null
astro-ph
null
We present the results of a detailed modeling aimed to reproduce the spectral energy distribution (SED) of dust and molecular line emission of massive protostars under the hypothesis that they form via an accretion process. We model the emission originated in the infalling envelopes at scales smaller than 0.1 pc from the central protostar. To do that, we compared our model results with observational data covering a wide range of wavelengths, paying special attention to the high angular resolution mid-infrared data obtained with the Gemini Observatory and the ammonia line emission observed with the VLA at centimeter wavelengths. We have explored two kind of model envelopes. In the first kind of models, spherical symmetry is assumed and the SED as well as the ammonia emission of the infalling envelope are calculated. In this way, the temperature, density, velocity, velocity dispersion, and ammonia abundance variations along the core can be obtained. The second approach takes into account deviations from the spherical symmetry, and parameters such as the rotation, degree of elongation of the core, or inclination of the system can be constrained through the SED fitting. Using these two approaches we have been able to model the formation of massive stars with a degree of detail similar to that reached for the low mass stars.
[ { "version": "v1", "created": "Fri, 14 Dec 2007 12:22:42 GMT" } ]
2007-12-17T00:00:00
[ [ "Osorio", "Mayra", "" ] ]
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712.2334
Daniel Sevcovic
M. Benes, M. Kimura, P. Paus, D. Sevcovic, T. Tsujikawa, S. Yazaki
Application of a curvature adjusted method in image segmentation
submitted to: Bulltetin of Inst. of Mathematics, Academia Sinica at Taipei
null
null
null
math.NA
null
This article deals with flow of plane curves driven by the curvature and external force. We make use of such a geometric flow for the purpose of image segmentation. A parametric model for evolving curves with uniform and curvature adjusted redistribution of grid points will be described and compared.
[ { "version": "v1", "created": "Fri, 14 Dec 2007 12:24:30 GMT" } ]
2007-12-17T00:00:00
[ [ "Benes", "M.", "" ], [ "Kimura", "M.", "" ], [ "Paus", "P.", "" ], [ "Sevcovic", "D.", "" ], [ "Tsujikawa", "T.", "" ], [ "Yazaki", "S.", "" ] ]
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712.2335
Didier Sornette
D. Sornette, S. Utkin and A. Saichev
Nonlinear theory and tests of earthquake recurrence times
31 pages including 11 figures
null
10.1103/PhysRevE.77.066109
null
physics.data-an physics.geo-ph
null
We develop an efficient numerical scheme to solve accurately the set of nonlinear integral equations derived previously in (Saichev and Sornette, 2007), which describes the distribution of inter-event times in the framework of a general model of earthquake clustering with long memory. Detailed comparisons between the linear and nonlinear versions of the theory and direct synthetic catalogs show that the nonlinear theory provides an excellent fit to the synthetic catalogs, while there are significant biases resulting from the use of the linear approximation. We then address the suggestions proposed by some authors to use the empirical distribution of inter-event times to obtain a better determination of the so-called clustering parameter. Our theory and tests against synthetic and empirical catalogs find a rather dramatic lack of power for the distribution of inter-event times to distinguish between quite different sets of parameters, casting doubt on the usefulness of this statistics for the specific purpose of identifying the clustering parameter.
[ { "version": "v1", "created": "Fri, 14 Dec 2007 12:29:20 GMT" } ]
2009-11-13T00:00:00
[ [ "Sornette", "D.", "" ], [ "Utkin", "S.", "" ], [ "Saichev", "A.", "" ] ]
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712.2336
Andreas Schaelicke
Andreas Sch\"alicke, Karim Laihem and Pavel Starovoitov
Polarised Geant4 - Applications at the ILC
Proceedings to the International Conference on Linear Colliders (ILC07/LCWS07), Hamburg 2007
ECONF C0705302:POL04,2007
null
DESY-07-202
physics.ins-det
null
Geant4 is a Monte Carlo simulation framework for the description of interactions of particles and matter. Starting with version 8.2 a new package of QED physics processes is available, allowing for the studies of interactions of polarised particles with polarised media dedicated to beam applications. In this contribution some details about the implementation are presented and applications to the linear collider are discussed.
[ { "version": "v1", "created": "Fri, 14 Dec 2007 12:38:20 GMT" } ]
2009-02-16T00:00:00
[ [ "Schälicke", "Andreas", "" ], [ "Laihem", "Karim", "" ], [ "Starovoitov", "Pavel", "" ] ]
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712.2337
David Sauzin
David Sauzin (IMCCE)
Mould expansions for the saddle-node and resurgence monomials
78 pages
null
null
null
math.DS
null
This article is an introduction to some aspects of \'Ecalle's mould calculus, a powerful combinatorial tool which yields surprisingly explicit formulas for the normalising series attached to an analytic germ of singular vector field or of map. This is illustrated on the case of the saddle-node, a two-dimensional vector field which is formally conjugate to Euler's vector field $x^2\frac{\pa}{\pa x}+(x+y)\frac{\pa}{\pa y}$, and for which the formal normalisation is shown to be resurgent in $1/x$. Resurgence monomials adapted to alien calculus are also described as another application of mould calculus.
[ { "version": "v1", "created": "Fri, 14 Dec 2007 12:35:59 GMT" } ]
2007-12-17T00:00:00
[ [ "Sauzin", "David", "", "IMCCE" ] ]
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712.2338
Louis-Pierre Arguin
Louis-Pierre Arguin
Competing Particle Systems and the Ghirlanda-Guerra Identities
17 pages
Electr. Jour. Prob. 13 (2008) 2101-2117
null
null
math.PR cond-mat.dis-nn math-ph math.MP
null
We study point processes on the real line whose configurations X can be ordered decreasingly and evolve by increments which are functions of correlated gaussian variables. The correlations are intrinsic to the points and quantified by a matrix Q={q_ij}. Quasi-stationary systems are those for which the law of (X,Q) is invariant under the evolution up to translation of X. It was conjectured by Aizenman and co-authors that the matrix Q of robustly quasi-stationary systems must exhibit a hierarchal structure. This was established recently, up to a natural decomposition of the system, whenever the set S_Q of values assumed by q_ij is finite. In this paper, we study the general case where S_Q may be infinite. Using the past increments of the evolution, we show that the law of robustly quasi-stationary systems must obey the Ghirlanda-Guerra identities, which first appear in the study of spin glass models. This provides strong evidence that the above conjecture also holds in the general case.
[ { "version": "v1", "created": "Fri, 14 Dec 2007 12:37:31 GMT" } ]
2010-11-09T00:00:00
[ [ "Arguin", "Louis-Pierre", "" ] ]
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712.2339
Serge Richard
Johannes Kellendonk, Serge Richard
The topological meaning of Levinson's theorem, half-bound states included
4 pages
null
10.1088/1751-8113/41/29/295207
null
math-ph math.MP
null
We propose to interpret Levinson's theorem as an index theorem. This exhibits its topological nature. It furthermore leads to a more coherent explanation of the corrections due to resonances at thresholds.
[ { "version": "v1", "created": "Fri, 14 Dec 2007 12:39:04 GMT" } ]
2009-11-13T00:00:00
[ [ "Kellendonk", "Johannes", "" ], [ "Richard", "Serge", "" ] ]
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712.234
Andreas Schaelicke
Andreas Sch\"alicke
Polarised Positrons for the ILC
Presented at the XXXI International Conference of Theoretical Physics, "Matter to the Deepest", Ustron, Poland, September 5--11, 2007
ActaPhys.Polon.B38:3589,2007
null
DESY-07-203
hep-ex
null
For the planned International Linear Collider it is intended to have both -- electron and positron -- beams polarised. This offers a great benefit for many physics studies, but also provides a challenge for the engineering of the machine. A polarised positron source that meets the machine parameters is topic of current design studies and prototype experiments.
[ { "version": "v1", "created": "Fri, 14 Dec 2007 12:50:37 GMT" } ]
2008-11-26T00:00:00
[ [ "Schälicke", "Andreas", "" ] ]
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712.2341
Lars Brink
Lars Brink
From the Nambu-Goto the Sigma-Model Action, Memoirs from Long Ago
Contribution to the volume "The Birth of StringTheory" 12 pages
null
null
null
hep-th
null
In this article I describe my own stumblings in the first string era. This was a time when most of the active people were very young, not very knowledgeable and the field was completely new. Many of us had little training for what we came to work on, and it took quite some time to accomplish the new conceptual discoveries.
[ { "version": "v1", "created": "Fri, 14 Dec 2007 12:56:47 GMT" } ]
2007-12-17T00:00:00
[ [ "Brink", "Lars", "" ] ]
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712.2342
Klaus Capelle
Mariana M. Odashima and K. Capelle
Empirical analysis of the Lieb-Oxford bound in ions and molecules
8 pages, 3 color figures
Int. J. Quantum Chem. 108, p. 2428 (2008)
10.1002/qua.21677
null
physics.chem-ph cond-mat.mtrl-sci physics.atom-ph
null
Universal properties of the Coulomb interaction energy apply to all many-electron systems. Bounds on the exchange-correlation energy, inparticular, are important for the construction of improved density functionals. Here we investigate one such universal property -- the Lieb-Oxford lower bound -- for ionic and molecular systems. In recent work [J. Chem. Phys. 127, 054106 (2007)], we observed that for atoms and electron liquids this bound may be substantially tightened. Calculations for a few ions and molecules suggested the same tendency, but were not conclusive due to the small number of systems considered. Here we extend that analysis to many different families of ions and molecules, and find that for these, too, the bound can be empirically tightened by a similar margin as for atoms and electron liquids. Tightening the Lieb-Oxford bound will have consequences for the performance of various approximate exchange-correlation functionals.
[ { "version": "v1", "created": "Fri, 14 Dec 2007 13:00:41 GMT" } ]
2015-05-13T00:00:00
[ [ "Odashima", "Mariana M.", "" ], [ "Capelle", "K.", "" ] ]
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712.2343
Andriy Ushakov
Andriy Ushakov and Sabine Riemann
Radiation damage of the ILC positron source target
to appear in the proceedings of the Linear Collider Workshop 2007 and the International Linear Collider meeting 2007, DESY, Hamburg, 30 May - 3 June 2007
ECONF C0705302:SRC10,2007
null
DESY 07-204
physics.acc-ph
null
The radiation damage of the positron source target for the International Linear Collider (ILC) has been studied. The displacement damage in target material due to multi-MeV photons has been calculated by combining FLUKA simulations for secondary particle production, SPECTER data for neutron displacement cross-sections and the Lindhard model for estimations of displacement damage by ions. The radiation damage of a stationary Ti6Al4V target in units of displacements per atom (dpa) has been estimated for photons from an undulator with strength 0.92 and period 1.15 cm. The calculated damage is 7 dpa. Approximately 12.5% of displacement damage result from neutrons.
[ { "version": "v1", "created": "Fri, 14 Dec 2007 13:12:48 GMT" } ]
2009-02-16T00:00:00
[ [ "Ushakov", "Andriy", "" ], [ "Riemann", "Sabine", "" ] ]
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712.2344
Par M. Kurlberg
Robert L. Benedetto, Dragos Ghioca, Par Kurlberg, and Thomas J. Tucker
The Dynamical Mordell-Lang Conjecture
25 pages. Results strengthened to include the case of indecomposable polynomials with complex coefficients (using some recent results of Medvedev and Scanlon.)
null
null
null
math.NT math.AG math.DS
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We prove a special case of a dynamical analogue of the classical Mordell-Lang conjecture. In particular, let $\phi$ be a rational function with no superattracting periodic points other than exceptional points. If the coefficients of $\phi$ are algebraic, we show that the orbit of a point outside the union of proper preperiodic subvarieties of $(\bP^1)^g$ has only finite intersection with any curve contained in $(\bP^1)^g$. We also show that our result holds for indecomposable polynomials $\phi$ with coefficients in $\bC$. Our proof uses results from $p$-adic dynamics together with an integrality argument. The extension to polynomials defined over $\bC$ uses the method of specializations coupled with some new results of Medvedev and Scanlon for describing the periodic plane curves under the action of $(\phi,\phi)$ on $\bA^2$.
[ { "version": "v1", "created": "Fri, 14 Dec 2007 13:06:51 GMT" }, { "version": "v2", "created": "Fri, 6 Feb 2009 16:13:22 GMT" } ]
2009-02-06T00:00:00
[ [ "Benedetto", "Robert L.", "" ], [ "Ghioca", "Dragos", "" ], [ "Kurlberg", "Par", "" ], [ "Tucker", "Thomas J.", "" ] ]
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712.2345
Yi Wang
Bin Chen, Yi Wang, Wei Xue
Inflationary NonGaussianity from Thermal Fluctuations
20 pages, 1 figure. v2, v3: references and acknowledgments updated
JCAP 0805:014,2008
10.1088/1475-7516/2008/05/014
CAS-KITPC/ITP-017
hep-th astro-ph gr-qc
null
We calculate the contribution of the fluctuations with the thermal origin to the inflationary nonGaussianity. We find that even a small component of radiation can lead to a large nonGaussianity. We show that this thermal nonGaussianity always has positive $f_{\rm NL}$. We illustrate our result in the chain inflation model and the very weakly dissipative warm inflation model. We show that $f_{NL}\sim {\cal O}(1)$ is general in such models. If we allow modified equation of state, or some decoupling effects, the large thermal nonGaussianity of order $f_{\rm NL}>5$ or even $f_{\rm NL}\sim 100$ can be produced. We also show that the power spectrum of chain inflation should have a thermal origin. In the Appendix A, we made a clarification on the different conventions used in the literature related to the calculation of $f_{\rm NL}$.
[ { "version": "v1", "created": "Fri, 14 Dec 2007 13:13:37 GMT" }, { "version": "v2", "created": "Sat, 15 Dec 2007 02:10:09 GMT" }, { "version": "v3", "created": "Tue, 18 Dec 2007 12:27:15 GMT" } ]
2009-12-15T00:00:00
[ [ "Chen", "Bin", "" ], [ "Wang", "Yi", "" ], [ "Xue", "Wei", "" ] ]
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712.2346
Bernd Reindl
G.A. Tammann (1), A. Sandage (2), B. Reindl (1) ((1) Astr. Inst. Univ. Basel, (2) Obs. Carnegie Inst. Washington)
Comparison of Distances from RR Lyrae Stars, the Tip of the Red-Giant Branch and Classical Cepheids
55 pages, 9 figures, 9 tables, accepted for publication in the Astrophysical Journal
null
10.1086/529508
null
astro-ph
null
The extragalactic distance scale relies heavily on Cepheids. However, it has become clear from observations and pulsation models that the slope and zero point of their P-L relations differ from galaxy to galaxy. This makes the determination of Cepheid distances complex and calls for an independent test of their differences. The test is provided by RR Lyrae star distances of 24 galaxies which calibrate the tip of the red-giant branch (TRGB; M_I = -4.05), which in turn confirms the adopted Cepheids distances on our 2006 distance scale in 18 cases to within 0.1 mag on average. Relative SN Ia and velocity distances deny a remaining significant metallicity effect of the adopted distances. The new support for these Cepheid distances increases the weight of our previous calibration of the SN Ia luminosity and of the 21cm line width - luminosity (TF) relation. The value of H_0 = 62.3 (+/-5) is confirmed on all scales.
[ { "version": "v1", "created": "Fri, 14 Dec 2007 13:57:16 GMT" } ]
2009-11-13T00:00:00
[ [ "Tammann", "G. A.", "" ], [ "Sandage", "A.", "" ], [ "Reindl", "B.", "" ] ]
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712.2347
Vladimir Chernov (Tchernov)
Evarist Byberi and Vladimir Chernov (Tchernov)
Virtual Bridge Number One Knots
8 pages, 7 figures
Commun. Contemp. Math. 10 (2008), suppl. 1, 1013-1021
null
null
math.GT
null
We define the virtual bridge number $vb(K)$ and the virtual unknotting number $vu(K)$ invariants for virtual knots. For ordinary knots $K$ they are closely related to the bridge number $b(K)$ and the unknotting number $u(K)$ and we have $vu(K)\leq u(K), vb(K)\leq b(K).$ There are no ordinary knots $K$ with $b(K)=1.$ We show there are infinitely many homotopy classes of virtual knots each of which contains infinitely many isotopy classes of $K$ with $vb(K)=1.$ In fact for each $i\in \N$ there exists $K$ virtually homotopic (but not virtually isotopic) to the unknot with $vb(K)=1$ and $vu(K)=i.$
[ { "version": "v1", "created": "Fri, 14 Dec 2007 13:29:07 GMT" } ]
2014-04-24T00:00:00
[ [ "Byberi", "Evarist", "", "Tchernov" ], [ "Chernov", "Vladimir", "", "Tchernov" ] ]
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712.2348
Thomas Kuhr
CDF collaboration: T. Aaltonen, et al
Measurement of Lifetime and Decay-Width Difference in B0s -> J/psi phi Decays
null
Phys.Rev.Lett.100:121803,2008
10.1103/PhysRevLett.100.121803
FERMILAB-PUB-07-655-E
hep-ex
null
We measure the mean lifetime, tau=2/(Gamma_L+Gamma_H), and the width difference, DeltaGamma=Gamma_L-Gamma_H, of the light and heavy mass eigenstates of the B0s meson, B0sL and B0sH, in B0s -> J/psi phi decays using 1.7 fb^-1 of data collected with the CDF II detector at the Fermilab Tevatron ppbar collider. Assuming CP conservation, a good approximation for the B0s system in the Standard Model, we obtain DeltaGamma = 0.076^+0.059_-0.063 (stat.) +- 0.006 (syst.) ps^-1 and tau = 1.52 +- 0.04 (stat.) +- 0.02 (syst.) ps, the most precise measurements to date. Our constraints on the weak phase and DeltaGamma are consistent with CP conservation. Dedicated to the memory of our dear friend and colleague, Michael P. Schmidt
[ { "version": "v1", "created": "Fri, 14 Dec 2007 20:05:51 GMT" }, { "version": "v2", "created": "Tue, 1 Apr 2008 19:01:20 GMT" } ]
2010-05-12T00:00:00
[ [ "CDF collaboration", "", "" ], [ "Aaltonen", "T.", "" ] ]
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712.2349
Sebastian Bernhardsson
Petter Minnhagen and Sebastian Bernhardsson
Optimization and Scale-freeness for Complex Networks
8 pages, 4 figures
Chaos 17, 2 (2007)
10.1063/1.2720101
null
cond-mat.stat-mech
null
Complex networks are mapped to a model of boxes and balls where the balls are distinguishable. It is shown that the scale-free size distribution of boxes maximizes the information associated with the boxes provided configurations including boxes containing a finite fraction of the total amount of balls are excluded. It is conjectured that for a connected network with only links between different nodes, the nodes with a finite fraction of links are effectively suppressed. It is hence suggested that for such networks the scale-free node-size distribution maximizes the information encoded on the nodes. The noise associated with the size distributions is also obtained from a maximum entropy principle. Finally explicit predictions from our least bias approach are found to be born out by metabolic networks.
[ { "version": "v1", "created": "Fri, 14 Dec 2007 13:55:45 GMT" } ]
2007-12-17T00:00:00
[ [ "Minnhagen", "Petter", "" ], [ "Bernhardsson", "Sebastian", "" ] ]
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712.235
Klaus Capelle
J. M. Morbec and K. Capelle
Orbital-polarization terms: from a phenomenological to a first-principles description of orbital magnetism in density-functional theory
null
Int. J. Quantum Chem. 108, p. 2433 (2008)
10.1002/qua.21784
null
cond-mat.mtrl-sci physics.chem-ph
null
Phenomenological orbital-polarization (OP) terms have been repeatedly introduced in the single-particle equations of spin-density-functional theory, in order to improve the description of orbital magnetic moments in systems containing transition metal ions. Here we show that these ad hoc corrections can be interpreted as approximations to the exchange-correlation vector potential A_xc of current-density-functional theory (CDFT). This connection provides additional information on both approaches: Phenomenological OP terms are connected to first-principles theory, leading to a rationale for their empirical success and a reassessment of their limitations and the approximations made in their derivation. Conversely, the connection of OP terms with CDFT leads to a set of simple approximations to the CDFT potential A_xc, with a number of desirable features that are absent from electron-gas-based functionals.
[ { "version": "v1", "created": "Fri, 14 Dec 2007 13:48:08 GMT" } ]
2015-05-13T00:00:00
[ [ "Morbec", "J. M.", "" ], [ "Capelle", "K.", "" ] ]
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712.2351
Teruhiko Kawano
Teruhiko Kawano
Chaotic D-Term Inflation
3 pages, lanlmac
Prog. Theor. Phys. 120 (2008), 793
10.1143/PTP.120.793
UT-07-40
hep-th astro-ph gr-qc hep-ph
null
A simple model for chaotic inflation in supergravity is proposed. The model is N=1 supersymmetric massive U(1) gauge theory via the Stuckelberg superfield and gives rise to D-term inflation with a quadratic term of inflaton in the potential. The Fayet-Iliopoulos field plays a role of the inflaton.
[ { "version": "v1", "created": "Fri, 14 Dec 2007 14:05:09 GMT" } ]
2008-12-23T00:00:00
[ [ "Kawano", "Teruhiko", "" ] ]
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712.2352
Guido Nolte
Guido Nolte, Andreas Ziehe, Vadim V. Nikulin, Alois Schl\"ogl, Nicole Kr\"amer, Tom Brismar, Klaus-Robert M\"uller
Robustly estimating the flow direction of information in complex physical systems
5 pages, 4 figures
null
10.1103/PhysRevLett.100.234101
null
stat.ME stat.AP
null
We propose a new measure to estimate the direction of information flux in multivariate time series from complex systems. This measure, based on the slope of the phase spectrum (Phase Slope Index) has invariance properties that are important for applications in real physical or biological systems: (a) it is strictly insensitive to mixtures of arbitrary independent sources, (b) it gives meaningful results even if the phase spectrum is not linear, and (c) it properly weights contributions from different frequencies. Simulations of a class of coupled multivariate random data show that for truly unidirectional information flow without additional noise contamination our measure detects the correct direction as good as the standard Granger causality. For random mixtures of independent sources Granger Causality erroneously yields highly significant results whereas our measure correctly becomes non-significant. An application of our novel method to EEG data (88 subjects in eyes-closed condition) reveals a strikingly clear front-to-back information flow in the vast majority of subjects and thus contributes to a better understanding of information processing in the brain.
[ { "version": "v1", "created": "Fri, 14 Dec 2007 16:10:07 GMT" } ]
2009-11-13T00:00:00
[ [ "Nolte", "Guido", "" ], [ "Ziehe", "Andreas", "" ], [ "Nikulin", "Vadim V.", "" ], [ "Schlögl", "Alois", "" ], [ "Krämer", "Nicole", "" ], [ "Brismar", "Tom", "" ], [ "Müller", "Klaus-Robert", "" ] ]
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712.2353
Stephen L. Olsen
Stephen L. Olsen (for the Belle Collaboration)
Recent Belle results on CP violation
5 pages, 5 figures to be published in the Proceedings of the 4th International Conference on Flavor Physics (ICFP 2007), Beijing, China, 24-28 Sept. 2007
Int.J.Mod.Phys.A23:3277-3281,2008
10.1142/S0217751X08041979
null
hep-ex
null
The Belle experiment's recent results on CP violation in B meson decays are summarized.
[ { "version": "v1", "created": "Fri, 14 Dec 2007 08:05:11 GMT" } ]
2019-08-13T00:00:00
[ [ "Olsen", "Stephen L.", "", "for the Belle Collaboration" ] ]
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712.2354
Victor Malyshev
Joost A. Klugkist, Victor A. Malyshev, Jasper Knoester
Intrinsic optical bistability of thin films of linear molecular aggregates: The two-exciton approximation
11 two-column pages, 6 figures, to appear in the Journal of Chemical Physics
J. Chem. Phys. 128, 084706 (2008)
10.1063/1.2832312
null
cond-mat.dis-nn cond-mat.mtrl-sci
null
We generalize our recent work on the optical bistability of thin films of molecular aggregates [J. Chem. Phys. 127, 164705 (2007); arXiv:0707.1264v1 [cond-mat.dis-nn]] by accounting for the optical transitions from the one-exciton manifold to the two-exciton manifold as well as the exciton-exciton annihilation of the two-exciton states via a high-lying molecular vibronic term. We also include the relaxation from the vibronic level back to both the one-exciton manifold and the ground state. By selecting the dominant optical transitions between the ground state, the one-exciton manifold, and the two-exciton manifold, we reduce the problem to four levels, enabling us to describe the nonlinear optical response of the film. The one- and two-exciton states are obtained by diagonalizing a Frenkel Hamiltonian with an uncorrelated on-site (diagonal) disorder. The optical dynamics is described by means of the density matrix equations coupled to the electromagnetic field in the film. We show that the one-to-two exciton transitions followed by a fast exciton-exciton annihilation promote the occurrence of bistability and reduce the switching intensity. We provide estimates of pertinent parameters for actual materials and conclude that the effect can be realized.
[ { "version": "v1", "created": "Fri, 14 Dec 2007 14:17:34 GMT" } ]
2009-11-13T00:00:00
[ [ "Klugkist", "Joost A.", "" ], [ "Malyshev", "Victor A.", "" ], [ "Knoester", "Jasper", "" ] ]
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712.2355
Rikkert Frederix
R. Frederix, F. Maltoni
Top pair invariant mass distribution: a window on new physics
32 pages, 18 figures; Improvements on the section about the top quark mass dependence, including one more figure
JHEP 0901:047,2009
10.1088/1126-6708/2009/01/047
CP3-07-29
hep-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We explore in detail the physics potential of a measurement of the ttbar invariant mass distribution. First, we assess the accuracy of the best available predictions for this observable and find that in the low invariant mass region, the shape is very well predicted and could be used to perform a top mass measurement. Second, we study the effects of a heavy s-channel resonance on the ttbar invariant mass distribution, in a model independent way. We provide the necessary Monte Carlo tools to perform the search and outline a simple three-step analysis.
[ { "version": "v1", "created": "Fri, 14 Dec 2007 14:26:04 GMT" }, { "version": "v2", "created": "Wed, 9 Jul 2008 12:34:28 GMT" }, { "version": "v3", "created": "Wed, 21 Jan 2009 09:11:45 GMT" } ]
2009-01-27T00:00:00
[ [ "Frederix", "R.", "" ], [ "Maltoni", "F.", "" ] ]
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712.2356
Klaus Moenig
Ties Behnke, Chris Damerell, John Jaros, Akya Myamoto, et al
ILC Reference Design Report Volume 4 - Detectors
A version with high resolution pictures can be found at http://www.linearcollider.org/cms/?pid=1000437 The full authorlist is inside the report
null
null
null
physics.ins-det
null
This report, Volume IV of the International Linear Collider Reference Design Report, describes the detectors which will record and measure the charged and neutral particles produced in the ILC's high energy e+e- collisions. The physics of the ILC, and the environment of the machine-detector interface, pose new challenges for detector design. Several conceptual designs for the detector promise the needed performance, and ongoing detector R&D is addressing the outstanding technological issues. Two such detectors, operating in push-pull mode, perfectly instrument the ILC interaction region, and access the full potential of ILC physics.
[ { "version": "v1", "created": "Fri, 14 Dec 2007 10:36:45 GMT" } ]
2007-12-17T00:00:00
[ [ "Behnke", "Ties", "" ], [ "Damerell", "Chris", "" ], [ "Jaros", "John", "" ], [ "Myamoto", "Akya", "" ] ]
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712.2357
Ansgar Reiners
Ansgar Reiners
At the Bottom of the Main Sequence: Activity and magnetic fields beyond the threshold to complete convection
25 pages, 7 figures, Ludwig Biermann Lecture given at the annual meeting of the German Astronomical Society, 2007, v2
null
10.1002/9783527622993.ch3
null
astro-ph
null
The bottom of the main sequence hosts objects with fundamentally different properties. At masses of about 0.3 M$_{\odot}$, stars become fully convective and at about 0.08 M$_{\odot}$ the hydrogen-burning main sequence ends; less massive objects are brown dwarfs. While stars and brown dwarfs experience very different evolutions, their inner structure has relatively little impact on the atmospheres. The generation of magnetic fields and activity is obviously connected to the threshold between partial and complete convection, because dynamo mechanisms involving a layer of shear like the solar $\alpha\Omega$-dynamo must cease. Hence a change in stellar activity can be expected there. Observations of stellar activity do not confirm a rapid break in activity at the convection boundary, but the fraction of active stars and rapid rotators is higher on the fully convective side. I summarize the current picture of stellar activity and magnetic field measurements at the bottom of the main sequence and present recent results on rotational braking beyond.
[ { "version": "v1", "created": "Fri, 14 Dec 2007 14:21:59 GMT" }, { "version": "v2", "created": "Tue, 18 Dec 2007 13:49:17 GMT" } ]
2015-05-13T00:00:00
[ [ "Reiners", "Ansgar", "" ] ]
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712.2358
Richard W. Robinett
R. W. Robinett
Using Physics to Learn Mathematica to Do Physics: From Homework Problems to Research Examples
27 pages, 3 figures
null
null
null
physics.ed-ph physics.comp-ph
null
We describe the development of a junior-senior level course for Physics majors designed to teach Mathematica skills in support of their undergraduate coursework, but also to introduce students to modern research level results. Standard introductory and intermediate level Physics homework-style problems are used to teach Mathematica commands and programming methods, which are then applied, in turn, to more sophisticated problems in some of the core undergraduate subjects, along with making contact with recent research papers in a variety of fields.
[ { "version": "v1", "created": "Fri, 14 Dec 2007 14:22:39 GMT" } ]
2007-12-17T00:00:00
[ [ "Robinett", "R. W.", "" ] ]
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712.2359
Katarzyna Ostasiewicz
A. Radosz, A. T. Augousti, K. Ostasiewicz
Decoupling of kinematical time dilation and gravitational time dilation in particular geometries
4 pages
ActaPhys.Polon.B39:1357-1362,2008
null
null
gr-qc
null
Two different forms of time dilation, namely, the kinematical time dilation of special relativity and gravitational red shift are coupled during observations of systems moving through a gravitational field. In the particular situation of free fall in a Schwarzschild geometry these two effects are decoupled and in consequence the time dilation, as observed by a distant observer, factorises. Such a factorization is not a universal feature. We define here a necessary and sufficient criterion for time dilation and gravitational red-shift decoupling. This property is manifested in a particular form of the Doppler shift in Schwarzschild geometry.
[ { "version": "v1", "created": "Fri, 14 Dec 2007 14:27:49 GMT" } ]
2008-11-26T00:00:00
[ [ "Radosz", "A.", "" ], [ "Augousti", "A. T.", "" ], [ "Ostasiewicz", "K.", "" ] ]
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712.236
John Ellis
J.S. Lee, M. Carena, J. Ellis, A. Pilaftsis and C.E.M. Wagner
CPsuperH2.0: an Improved Computational Tool for Higgs Phenomenology in the MSSM with Explicit CP Violation
35 pages, 11 figures, references added, to appear in Comput. Phys. Commun
Comput.Phys.Commun.180:312-331,2009
10.1016/j.cpc.2008.09.003
KEK-TH-1203
hep-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We describe the Fortran code CPsuperH2.}, which contains several improvements and extensions of its predecessor CPsuperH. It implements improved calculations of the Higgs-boson pole masses, notably a full treatment of the 4 times 4 neutral Higgs propagator matrix including the Goldstone boson and a more complete treatment of threshold effects in self-energies and Yukawa couplings, improved treatments of two-body Higgs decays, some important three-body decays, and two-loop Higgs-mediated contributions to electric dipole moments. CPsuperH2.0 also implements an integrated treatment of several B-meson observables, including the branching ratios of B_s to mu^+ mu^-, B_d to tau^+ tau^-, B_u to tau nu, B to X_s gamma and the latter's CP-violating asymmetry A_CP, and the supersymmetric contributions to the B^0_{s,d} - \bar B^0_{s,d} mass differences. These additions make CPsuperH2.0 an attractive integrated tool for analyzing supersymmetric CP and flavour physics as well as searches for new physics at high-energy colliders such as the Tevatron, LHC and linear colliders. The program may be obtained from http://www.hep.man.ac.uk/u/jslee/CPsuperH.html
[ { "version": "v1", "created": "Fri, 14 Dec 2007 14:28:05 GMT" }, { "version": "v2", "created": "Wed, 3 Sep 2008 11:44:49 GMT" } ]
2009-02-02T00:00:00
[ [ "Lee", "J. S.", "" ], [ "Carena", "M.", "" ], [ "Ellis", "J.", "" ], [ "Pilaftsis", "A.", "" ], [ "Wagner", "C. E. M.", "" ] ]
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712.2361
Klaus Moenig
Nan Phinney, Nobukasu Toge, Nicholas Walker, et al
ILC Reference Design Report Volume 3 - Accelerator
A version with high resolution pictures can be found at http://www.linearcollider.org/cms/?pid=1000437 The full authorlist is inside the report
null
null
null
physics.acc-ph
null
The International Linear Collider (ILC) is a 200-500 GeV center-of-mass high-luminosity linear electron-positron collider, based on 1.3 GHz superconducting radio-frequency (SCRF) accelerating cavities. The ILC has a total footprint of about 31 km and is designed for a peak luminosity of 2x10^34 cm^-2 s^-1. The complex includes a polarized electron source, an undulator-based positron source, two 6.7 km circumference damping rings, two-stage bunch compressors, two 11 km long main linacs and a 4.5 km long beam delivery system. This report is Volume III (Accelerator) of the four volume Reference Design Report, which describes the design and cost of the ILC.
[ { "version": "v1", "created": "Fri, 14 Dec 2007 14:40:46 GMT" } ]
2007-12-18T00:00:00
[ [ "Phinney", "Nan", "" ], [ "Toge", "Nobukasu", "" ], [ "Walker", "Nicholas", "" ] ]
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712.2362
Boris Kostenko F.
B.F. Kostenko, J. Pribish, M.Z. Yuriev
Quantum Elastic Net and the Traveling Salesman Problem
Reported at Quantum Physics and Communication, Dubna, October 15-19, 2007
Physics of Particles and Nuclei Lett. 2009, V.6, P. 599
null
null
quant-ph
null
Theory of computer calculations strongly depends on the nature of elements the computer is made of. Quantum interference allows to formulate the Shor factorization algorithm turned out to be more effective than any one written for classical computers. Similarly, quantum wave packet reduction allows to devise the Grover search algorithm which outperforms any classical one. In the present paper we argue that the quantum incoherent tunneling can be used for elaboration of new algorithms able to solve some NP-hard problems, such as the Traveling Salesman Problem, considered to be intractable in the classical theory of computer computations.
[ { "version": "v1", "created": "Fri, 14 Dec 2007 14:44:45 GMT" }, { "version": "v2", "created": "Wed, 23 Jan 2008 15:56:08 GMT" }, { "version": "v3", "created": "Wed, 30 Jan 2008 16:52:43 GMT" } ]
2009-11-23T00:00:00
[ [ "Kostenko", "B. F.", "" ], [ "Pribish", "J.", "" ], [ "Yuriev", "M. Z.", "" ] ]
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712.2363
Jason Steffen
Jason H. Steffen (Fermilab) Octavio Valenzuela (UNAM, Mexico)
Constraints on the angular distribution of satellite galaxies about spiral hosts
MNRAS in press. Version 2 has some sections reordered and additional discussion included
Mon.Not.Roy.Astron.Soc.387:1199-1205,2008
10.1111/j.1365-2966.2008.13314.x
FERMILAB-PUB-07-654-A-CD
astro-ph
null
We present, using a novel technique, a study of the angular distribution of satellite galaxies around a sample of isolated, blue host galaxies selected from the sixth data release of the Sloan Digital Sky Survey. As a complement to previous studies we subdivide the sample of galaxies into bins of differing inclination and use the systematic differences that would exist between the different bins as the basis for our approach. We parameterize the cumulative distribution function of satellite galaxies and apply a maximum likelihood, Monte-Carlo technique to determine allowable distributions, which we show as an exclusion plot. We find that the allowed distributions of the satellites of spiral hosts are very nearly isotropic. We outline our formalism and our analysis and discuss how this technique may be refined for future studies and future surveys.
[ { "version": "v1", "created": "Fri, 14 Dec 2007 15:26:18 GMT" }, { "version": "v2", "created": "Fri, 11 Apr 2008 15:34:38 GMT" } ]
2008-11-26T00:00:00
[ [ "Steffen", "Jason H.", "", "Fermilab" ], [ "Valenzuela", "Octavio", "", "UNAM, Mexico" ] ]
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712.2364
Peter Vermeire
Pete Vermeire
Singularities of the Secant Variety
6 pages
null
null
null
math.AG math.AC
null
We give positivity conditions on the embedding of a smooth variety which guarantee the normality of the secant variety, generalizing earlier results of the author and others. We also give classes of secant varieties satisfying the Hodge conjecture as well as a result on the singular locus of degenerate secant varieties.
[ { "version": "v1", "created": "Fri, 14 Dec 2007 14:55:14 GMT" } ]
2007-12-17T00:00:00
[ [ "Vermeire", "Pete", "" ] ]
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712.2365
Pieter Moree
Yves Gallot and Pieter Moree
Ternary cyclotomic polynomials having a large coefficient
19 pages, 6 tables, to appear in Crelle's Journal. Revised version with many small changes
J. Reine Angew. Math. 632 (2009), 105-125
null
MPIM2007-141
math.NT
null
Let $\Phi_n(x)$ denote the $n$th cyclotomic polynomial. In 1968 Sister Marion Beiter conjectured that $a_n(k)$, the coefficient of $x^k$ in $\Phi_n(x)$, satisfies $|a_n(k)|\le (p+1)/2$ in case $n=pqr$ with $p<q<r$ primes (in this case $\Phi_n(x)$ is said to be ternary). Since then several results towards establishing her conjecture have been proved (for example $|a_n(k)|\le 3p/4$). Here we show that, nevertheless, Beiter's conjecture is false for every $p\ge 11$. We also prove that given any $\epsilon>0$ there exist infinitely many triples $(p_j,q_j,r_j)$ with $p_1<p_2<... $ consecutive primes such that $|a_{p_jq_jr_j}(n_j)|>(2/3-\epsilon)p_j$ for $j\ge 1$.
[ { "version": "v1", "created": "Fri, 14 Dec 2007 15:05:49 GMT" }, { "version": "v2", "created": "Mon, 14 Apr 2008 14:49:54 GMT" } ]
2012-07-30T00:00:00
[ [ "Gallot", "Yves", "" ], [ "Moree", "Pieter", "" ] ]
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712.2366
Paolo Sibani
Paolo Sibani and Simon Christiansen
Thermal shifts and intermittent linear response of aging systems
10 pages, 17 figures, RevTeX style
Phys. Rev. E 77,041106 (2008)
10.1103/PhysRevE.77.041106
null
cond-mat.stat-mech cond-mat.dis-nn cond-mat.soft
null
At time $t$ after an initial quench, an aging system responds to a perturbation turned on at time $ t_{\rm w} < t$ in a way mainly depending on the number of intermittent energy fluctuations, so-called quakes, which fall within the observation interval $(t_{\rm w},t]$ [Sibani et al. Phys. Rev. B, 74, 224407 and Eur. J. of Physics B, 58,483-491, 2007]. The temporal distribution of the quakes implies a functional dependence of the average response on the ratio $t/t_{\rm w}$. Further insight is obtained imposing small temperature steps, so-called $T$-shifts. The average response as a function of $t/t_{\rm w,eff}$, where $t_{\rm w,eff}$ is the effective age, is similar to the response of a system aged isothermally at the final temperature. Using an Ising model with plaquette interactions, the applicability of analytic formulae for the average isothermal magnetization is confirmed. The $T$-shifted aging behavior of the model is described using effective ages. Large positive shifts nearly reset the effective age. Negative $T$-shifts offer a more detailed probe of the dynamics. Assuming the marginal stability of the `current' attractor against thermal noise fluctuations, the scaling form $t_{\rm w,eff} = t_{\rm w}^x$, and the dependence of the exponent $x$ on the aging temperatures before and after the shift are theoretically available. The predicted form of $x$ has no adjustable parameters. Both the algebraic scaling of the effective age and the form of the exponent agree with the data. The simulations thus confirm the crucial r\^{o}le of marginal stability in glassy relaxation.
[ { "version": "v1", "created": "Fri, 14 Dec 2007 15:37:12 GMT" } ]
2009-09-29T00:00:00
[ [ "Sibani", "Paolo", "" ], [ "Christiansen", "Simon", "" ] ]
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712.2367
Montserrat Teixidor i Bigas
Montserrat Teixidor i Bigas
Petri map for rank two bundles with canonical determinant
To appear in Compositio Mathematica
null
10.1112/S0010437X07003442
null
math.AG
null
We prove the Bertram-Feinberg-Mukai conjecture for a generic curve $C$ of genus $g$ and a semistable vector bundle $E$ of rank two and determinant $K$ on $C$, namely we prove the injectivity of the Petri-canonical map $S^2(H^0(E))\to H^0(S^2(E))$.
[ { "version": "v1", "created": "Fri, 14 Dec 2007 19:17:48 GMT" } ]
2014-01-14T00:00:00
[ [ "Bigas", "Montserrat Teixidor i", "" ] ]
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712.2368
Ewa L. Lokas
Ewa L. Lokas, Radoslaw Wojtak, Gary A. Mamon and Stefan Gottloeber
Mass modelling of galaxy clusters via velocity moments
6 pages, 5 figures, contribution to the proceedings of XIX Rencontres de Blois
null
null
null
astro-ph
null
We summarize the method of mass modelling of galaxy clusters based on reproducing the dispersion and kurtosis of the projected velocity distribution of galaxies. The models are parametrized within the framework of the NFW density profile, characterized by the virial mass and concentration, together with the constant anisotropy of galaxy orbits. The use of velocity dispersion alone does not allow to constrain all the three parameters from kinematic data due to the mass-anisotropy degeneracy. The degeneracy is broken by introducing the fourth velocity moment, the kurtosis. We tested the method based on fitting both moments on mock data sets drawn from simulated dark matter haloes and showed it to reproduce reliably the properties of the haloes. The method has been applied to estimate the mass, concentration and anisotropy of more than 20 clusters which allowed us to confirm, for the first time using kinematic data, the mass-concentration relation found in N-body simulations.
[ { "version": "v1", "created": "Fri, 14 Dec 2007 15:16:58 GMT" } ]
2007-12-17T00:00:00
[ [ "Lokas", "Ewa L.", "" ], [ "Wojtak", "Radoslaw", "" ], [ "Mamon", "Gary A.", "" ], [ "Gottloeber", "Stefan", "" ] ]
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712.2369
Jason Nordhaus
J. Nordhaus (Univ. of Rochester), E. G. Blackman (Univ. of Rochester)
Dynamos and Chemical Mixing in Evolved Stars
7 pages, 3 figures. To appear in AIP Proceedings of the IXth Torino Workshop on AGB Nucleosynthesis
AIPConf.Proc.1001:306-312,2008
10.1063/1.2916979
null
astro-ph
null
In low-mass Red Giant Branch (RGB) and Asymptotic Giant Branch (AGB) stars, anomalous mixing must transport material near the hydrogen-burning shell to the convective envelope. Recently, it was suggested that buoyant magnetic flux tubes could supply the necessary transport rate (Busso et al. 2007). The fields are assumed to originate from a dynamo operating in the stellar interior. Here, we show what is required of an $\alpha-\Omega$ dynamo in the envelope of an AGB star to maintain these fields. Differential rotation and rotation drain via turbulent dissipation and Poynting flux, so if shear can be resupplied by convection, then large-scale toroidal field strengths of $\left<B_\phi\right>\simeq3\times10^4$ G can be sustained at the base of the convection zone.
[ { "version": "v1", "created": "Fri, 14 Dec 2007 15:26:10 GMT" } ]
2008-11-26T00:00:00
[ [ "Nordhaus", "J.", "", "Univ. of Rochester" ], [ "Blackman", "E. G.", "", "Univ. of Rochester" ] ]
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712.237
Pin Liu
Changjian Fu, Pin Liu
Lifting to cluster-tilting objects in 2-Calabi-Yau triangulated categories
7 pages; typos corrected; reference added; a gap filled
null
null
null
math.RT math.RA
null
We show that a tilting module over the endomorphism algebra of a cluster-tilting object in a 2-Calabi-Yau triangulated category lifts to a cluster-tilting object in this 2-Calabi-Yau triangulated category. This generalizes a recent work of D. Smith for cluster categories.
[ { "version": "v1", "created": "Fri, 14 Dec 2007 15:24:24 GMT" }, { "version": "v2", "created": "Mon, 17 Dec 2007 02:21:51 GMT" }, { "version": "v3", "created": "Sat, 29 Dec 2007 15:23:54 GMT" } ]
2007-12-29T00:00:00
[ [ "Fu", "Changjian", "" ], [ "Liu", "Pin", "" ] ]
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712.2371
B.Sundar Rajan
Sanjay Karmakar and B. Sundar Rajan
Maximum-rate, Minimum-Decoding-Complexity STBCs from Clifford Algebras
Under consideration for possible publication in IEEE Transactions on Information Theory
null
null
null
cs.IT math.IT
null
It is well known that Space-Time Block Codes (STBCs) from orthogonal designs (ODs) are single-symbol decodable/symbol-by-symbol decodable (SSD) and are obtainable from unitary matrix representations of Clifford algebras. However, SSD codes are obtainable from designs that are not orthogonal also. Recently, two such classes of SSD codes have been studied: (i) Coordinate Interleaved Orthogonal Designs (CIODs) and (ii) Minimum-Decoding-Complexity (MDC) STBCs from Quasi-ODs (QODs). Codes from ODs, CIODs and MDC-QODs are mutually non-intersecting classes of codes. The class of CIODs have {\it non-unitary weight matrices} when written as a Linear Dispersion Code (LDC) proposed by Hassibi and Hochwald, whereas several known SSD codes including CODs have {\it unitary weight matrices}. In this paper, we obtain SSD codes with unitary weight matrices (that are not CODs) called Clifford Unitary Weight SSDs (CUW-SSDs) from matrix representations of Clifford algebras. A main result of this paper is the derivation of an achievable upper bound on the rate of any unitary weight SSD code as $\frac{a}{2^{a-1}}$ for $2^a$ antennas which is larger than that of the CODs which is $\frac{a+1}{2^a}$. It is shown that several known classes of SSD codes are CUW-SSD codes and CUW-SSD codes meet this upper bound. Also, for the codes of this paper conditions on the signal sets which ensure full-diversity and expressions for the coding gain are presented. A large class of SSD codes with non-unitary weight matrices are obtained which include CIODs as a proper subclass.
[ { "version": "v1", "created": "Fri, 14 Dec 2007 15:24:29 GMT" } ]
2007-12-17T00:00:00
[ [ "Karmakar", "Sanjay", "" ], [ "Rajan", "B. Sundar", "" ] ]
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712.2372
Ewa L. Lokas
Ewa L. Lokas, Jaroslaw Klimentowski and Radoslaw Wojtak
The effect of unbound stars on the mass modelling of the Fornax dwarf
7 pages, 5 figures, contribution to the proceedings of XIX Rencontres de Blois
null
null
null
astro-ph
null
We discuss how different approaches to selecting member stars in kinematic samples of dwarf spheroidal galaxies affect the estimates of their mass and anisotropy of stellar orbits. We demonstrate that the selection of members is an additional source of error compared to the usual uncertainties due to the sampling of velocity moments. As an example we use the kinematic data set for 202 stars in the Fornax dwarf galaxy for which we model the velocity dispersion profile and estimate the mass-to-light ratio and anisotropy assuming that mass follows light. We also show that stronger constraints on these parameters can be obtained if kurtosis of the velocity distribution is included in the analysis. Using the Besancon model of the Milky Way we demonstrate that the majority of contamination in Fornax probably comes from the Milky Way stars.
[ { "version": "v1", "created": "Fri, 14 Dec 2007 15:29:06 GMT" } ]
2007-12-17T00:00:00
[ [ "Lokas", "Ewa L.", "" ], [ "Klimentowski", "Jaroslaw", "" ], [ "Wojtak", "Radoslaw", "" ] ]
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712.2373
Shahin Atashbar Tehrani
Ali N. Khorramian and S. Atashbar Tehrani
Simple model for QCD analysis of the proton helicity structure
4 pages and 1 figure, submission for the Proceedings of the International Conference on Hadron Physics, 30 Aug - 3 Sep 2007, Canakkale, Turkey
null
null
null
hep-ph
null
In this paper we use the experimental data to obtain the polarized parton distribution functions (PPDFs) in the LO and NLO approximations. The analysis is based on the Jacobi polynomials expansion of the polarized structure function (PSF). Our calculations for polarized parton distribution functions based on the Jacobi polynomials method are in good agreement with the other theoretical models.
[ { "version": "v1", "created": "Fri, 14 Dec 2007 15:33:24 GMT" }, { "version": "v2", "created": "Sat, 15 Dec 2007 13:30:15 GMT" } ]
2007-12-17T00:00:00
[ [ "Khorramian", "Ali N.", "" ], [ "Tehrani", "S. Atashbar", "" ] ]
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712.2374
Jae Dong Noh
Sang-Woo Kim and Jae Dong Noh (UOS)
Instability in a Network Coevolving with a Particle System
4 pages and 5 figures
Phys. Rev. Lett. 100, 118702 (2008)
10.1103/PhysRevLett.100.118702
null
cond-mat.stat-mech
null
We study a coupled dynamics of a network and a particle system. Particles of density $\rho$ diffuse freely along edges, each of which is rewired at a rate given by a decreasing function of particle flux. We find that the coupled dynamics leads to an instability toward the formation of hubs and that there is a dynamic phase transition at a threshold particle density $\rho_c$. In the low density phase, the network evolves into a star-shaped one with the maximum degree growing linearly in time. In the high density phase, the network exhibits a fat-tailed degree distribution and an interesting dynamic scaling behavior. We present an analytic theory explaining mechanism for the instability and a scaling theory for the dynamic scaling behavior.
[ { "version": "v1", "created": "Fri, 14 Dec 2007 15:33:56 GMT" } ]
2008-03-24T00:00:00
[ [ "Kim", "Sang-Woo", "", "UOS" ], [ "Noh", "Jae Dong", "", "UOS" ] ]
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712.2375
Fabrizio Nicastro
F. Nicastro (1,2), Smita Mathur (3), Martin Elvis (2)
Missing Baryons and the Warm-Hot Intergalactic Medium
14 pages, accepted for publication in Science (to appear as a Perspective Article in a Januray 2008 special issue of Science)
null
10.1126/science.1151400
null
astro-ph
null
Stars and gas in galaxies, hot intracluster medium, and intergalactic photo-ionized gas make up at most half of the baryons that are expected to be present in the universe. The majority of baryons are still missing and are expected to be hidden in a web of warm-hot intergalactic medium. This matter was shock-heated during the collapse of density perturbations that led to the formation of the relaxed structures that we see today. Finding the missing baryons and thereby producing a complete inventory of possibly the only detectable component of the energy-mass budget of the universe is crucial to validate or invalidate our standard cosmological model.
[ { "version": "v1", "created": "Fri, 14 Dec 2007 15:47:50 GMT" } ]
2009-11-13T00:00:00
[ [ "Nicastro", "F.", "" ], [ "Mathur", "Smita", "" ], [ "Elvis", "Martin", "" ] ]
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712.2376
Johannes Voss
Johannes Voss and Daniela Pfannkuche
Electron spin relaxation in GaAs quantum dot systems - The role of the hyperfine interaction
14 pages, 10 figures
null
null
null
cond-mat.mes-hall cond-mat.other
null
We present numerical results for electron spin relaxation rates for single and laterally coupled double GaAs quantum dots in a perpendicular magnetic field. As source of spin relaxation we consider hyperfine interaction with the nuclear spins in the GaAs substrate. Due to the differences in the energy scales of the nuclear and electronic Zeeman energies, the phonon bath system has to be taken into account for energy dissipation. The corresponding transition rates of second order show strong dependencies on correlations between the electrons and the electronic energy differences, and hence on the magnetic field. For a highly asymmetric double dot we have found a relatively low second order electron spin relaxation rate for a wide range of magnetic fields.
[ { "version": "v1", "created": "Fri, 14 Dec 2007 15:48:30 GMT" } ]
2007-12-17T00:00:00
[ [ "Voss", "Johannes", "" ], [ "Pfannkuche", "Daniela", "" ] ]
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712.2377
Ettore Vicari
Andrea Pelissetto, Ettore Vicari
High-order perturbative expansions of multi-parameter Phi^4 quantum field theories
12 pages
null
null
null
hep-th cond-mat.stat-mech
null
We present high-order pertubative expansions of multi-parameter Phi^4 quantum field theories with an N-component fundamental field, containing up to 4th-order polynomials of the field. Multi-parameter Phi^4 theories generalize the simplest O(N)-symmetric Phi^4 theories, and describe more complicated symmetry breaking patterns. These notes collect several high-order perturbative series of physically interesting multi-parameter Phi^4 theories, to five or six loops. We consider the O(M)XO(N)-symmetric Phi^4 model, the so-called MN model, and a spin-density-wave Phi^4 model containing five quartic terms.
[ { "version": "v1", "created": "Fri, 14 Dec 2007 15:48:32 GMT" } ]
2007-12-19T00:00:00
[ [ "Pelissetto", "Andrea", "" ], [ "Vicari", "Ettore", "" ] ]
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712.2378
Alexander Gutman
A. E. Gutman, A. G. Kusraev, S. S. Kutateladze
The Wickstead Problem
44 pages; copyright statements are changed; some typos are corrected; item A3.9 is subdivided into two items and some remarks are added therein; the references section is corrected and slightly extended; a footnote on a foundation support is added
Siberian Electronic Math. Reports, 2008, V.5, 293-333
null
null
math.FA
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In 1977 Anthony Wickstead raised the question of the conditions for all band preserving linear operators to be order bounded in a vector lattice. This article overviews the main ideas and results on the Wickstead problem and its variations, focusing primarily on the case of band preserving operators in a universally complete vector lattice.
[ { "version": "v1", "created": "Fri, 14 Dec 2007 15:49:55 GMT" }, { "version": "v2", "created": "Sat, 15 Dec 2007 09:24:12 GMT" }, { "version": "v3", "created": "Wed, 2 Jul 2008 08:24:24 GMT" }, { "version": "v4", "created": "Sat, 13 Dec 2008 16:03:29 GMT" } ]
2011-05-31T00:00:00
[ [ "Gutman", "A. E.", "" ], [ "Kusraev", "A. G.", "" ], [ "Kutateladze", "S. S.", "" ] ]
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