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801.1473
Arunava Bhadra Dr.
A. Bhadra
Compatibility of Einstein minimally coupled self interacting scalar field theory with the solar system tests of gravity
6 pages, a part of the earlier version removed, final version accepeted by CQG
Class.Quant.Grav.25:205001,2008
10.1088/0264-9381/25/20/205001
null
gr-qc
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We examine the compatibility of the Einstein minimally coupled self-interacting scalar field theory with the local tests of gravity. We find that apart from the trivial case of the Schwarzschild-de Sitter solution with constant scalar field the theory does not admit any other static solution, which is consistent with the solar system tests of gravity.
[ { "version": "v1", "created": "Wed, 9 Jan 2008 17:52:16 GMT" }, { "version": "v2", "created": "Mon, 6 Oct 2008 05:40:29 GMT" } ]
2008-11-26T00:00:00
[ [ "Bhadra", "A.", "" ] ]
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801.1474
Andrea Grazian
E. Giallongo (1), R. Ragazzoni (2), A. Grazian (1), A. Baruffolo (2), G. Beccari (3), C. De Santis (1), E. Diolaiti (3), A. Di Paola (1), J. Farinato (2), A. Fontana (1), S. Gallozzi (1), F. Gasparo (4), G. Gentile (2), R. Green (5), J. Hill (5), O. Kuhn (5), F. Pasian (4), F. Pedichini (1), M. Radovich (6), P. Salinari (7), R. Smareglia (4), R. Speziali (1), V. Testa (1), D. Thompson (5), E. Vernet (7,8), R. M. Wagner (5) ((1) INAF - Osservatorio Astronomico di Roma, Monteporzio, Italy, (2) INAF - Osservatorio Astronomico di Padova, Padova, Italy, (3) INAF - Osservatorio Astronomico di Bologna, Bologna, Italy, (4) INAF - Osservatorio Astronomico di Trieste, Trieste, Italy, (5) Large Binocular Telescope Observatory, University of Arizona, Tucson, AZ, (6) INAF - Osservatorio Astronomico di Capodimonte, Napoli, Italy, (7) INAF - Osservatorio Astronomico di Arcetri, Firenze, Italy, (8) European Southern Observatory, Garching, Germany)
The performance of the blue prime focus Large Binocular Camera at the Large Binocular Telescope
Accepted for publication in A&A. Uses aa.cls, 10 pages, 10 figures. Zero points changed in Table 2
null
10.1051/0004-6361:20078402
null
astro-ph
null
We present the characteristics and some early scientific results of the first instrument at the Large Binocular Telescope (LBT), the Large Binocular Camera (LBC). Each LBT telescope unit will be equipped with similar prime focus cameras. The blue channel is optimized for imaging in the UV-B bands and the red channel for imaging in the VRIz bands. The corrected field-of-view of each camera is approximately 30 arcminutes in diameter, and the chip area is equivalent to a 23x23 arcmin2 field. In this paper we also present the commissioning results of the blue channel. The scientific and technical performance of the blue channel was assessed by measurement of the astrometric distortion, flat fielding, ghosts, and photometric calibrations. These measurements were then used as input to a data reduction pipeline applied to science commissioning data. The measurements completed during commissioning show that the technical performance of the blue channel is in agreement with original expectations. Since the red camera is very similar to the blue one we expect similar performance from the commissioning that will be performed in the following months in binocular configuration. Using deep UV image, acquired during the commissioning of the blue camera, we derived faint UV galaxy-counts in a ~500 sq. arcmin. sky area to U(Vega)=26.5. These galaxy counts imply that the blue camera is the most powerful UV imager presently available and in the near future in terms of depth and extent of the field-of-view. We emphasize the potential of the blue camera to increase the robustness of the UGR multicolour selection of Lyman break galaxies at redshift z~3.
[ { "version": "v1", "created": "Wed, 9 Jan 2008 18:08:04 GMT" }, { "version": "v2", "created": "Mon, 4 Feb 2008 15:10:45 GMT" }, { "version": "v3", "created": "Thu, 13 Mar 2008 10:25:37 GMT" } ]
2009-11-13T00:00:00
[ [ "Giallongo", "E.", "" ], [ "Ragazzoni", "R.", "" ], [ "Grazian", "A.", "" ], [ "Baruffolo", "A.", "" ], [ "Beccari", "G.", "" ], [ "De Santis", "C.", "" ], [ "Diolaiti", "E.", "" ], [ "Di Paola", "A.", "" ], [ "Farinato", "J.", "" ], [ "Fontana", "A.", "" ], [ "Gallozzi", "S.", "" ], [ "Gasparo", "F.", "" ], [ "Gentile", "G.", "" ], [ "Green", "R.", "" ], [ "Hill", "J.", "" ], [ "Kuhn", "O.", "" ], [ "Pasian", "F.", "" ], [ "Pedichini", "F.", "" ], [ "Radovich", "M.", "" ], [ "Salinari", "P.", "" ], [ "Smareglia", "R.", "" ], [ "Speziali", "R.", "" ], [ "Testa", "V.", "" ], [ "Thompson", "D.", "" ], [ "Vernet", "E.", "" ], [ "Wagner", "R. M.", "" ] ]
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801.1475
Woo-Sung Jung
Gabjin Oh, Cheoljun Eom, Shlomo Havlin, Woo-Sung Jung, Fengzhong Wang, H. Eugene Stanley, Seunghwan Kim
A Multifractal Analysis of Asian Foreign Exchange Markets
null
Eur. Phys. J. B (2012) 85: 214
10.1140/epjb/e2012-20570-0
null
q-fin.ST cond-mat.stat-mech physics.soc-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We analyze the multifractal spectra of daily foreign exchange rates for Japan, Hong-Kong, Korea, and Thailand with respect to the United States Dollar from 1991 to 2005. We find that the return time series show multifractal spectrum features for all four cases. To observe the effect of the Asian currency crisis, we also estimate the multifractal spectra of limited series before and after the crisis. We find that the Korean and Thai foreign exchange markets experienced a significant increase in multifractality compared to Hong-Kong and Japan. We also show that the multifractality is stronge related to the presence of high values of returns in the series.
[ { "version": "v1", "created": "Wed, 9 Jan 2008 18:09:26 GMT" }, { "version": "v2", "created": "Tue, 9 Jul 2019 15:15:33 GMT" } ]
2019-07-10T00:00:00
[ [ "Oh", "Gabjin", "" ], [ "Eom", "Cheoljun", "" ], [ "Havlin", "Shlomo", "" ], [ "Jung", "Woo-Sung", "" ], [ "Wang", "Fengzhong", "" ], [ "Stanley", "H. Eugene", "" ], [ "Kim", "Seunghwan", "" ] ]
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801.1476
Victor Sanchez-Morcillo
Yu. N. Makov and V.J. Sanchez-Morcillo
Fresnel Number Concept and Revision of some Characteristics in the Linear Theory of Focused Acoustic Beams
Submitted to Acta Acustica United with Acustica
null
null
null
physics.flu-dyn
null
The advisability of the use of the Fresnel number as the measure (characteristic) of the ratio of diffraction and focusing properties for ultrasonic transducers and its radiated beams is proposed and demonstrated. Althought this characteristic is more habitual in optics, in acoustics the equivalent (mathematically although not fully in its physical meaning) parameter of linear gain is used as a rule. However, the preference and the more accuracy of the Fresnel number use is demonstrated here on the basis that the usual determination of the linear gain parameter ceases to correspond to the real value of the gain for low Fresnel number acoustic beams. It connects with the linear effect of axial maximum pressure shift from the geometrical focus towards the transducer. This effect is known for a long time, but here the analytical formulas describing this shift with a high accuracy for arbitrary Fresnel numbers are presented. As a consequence, also the analytical dependence of the real gain on the Fresnel number is obtained.
[ { "version": "v1", "created": "Wed, 9 Jan 2008 18:12:36 GMT" } ]
2008-01-10T00:00:00
[ [ "Makov", "Yu. N.", "" ], [ "Sanchez-Morcillo", "V. J.", "" ] ]
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801.1477
Petit Jean Pierre
Jean-Pierre Petit, Gilles d'Agostini
Bigravity : A bimetric model of the Universe. Positive and negative gravitational lensings
19 pages, 20 figures
null
null
null
physics.gen-ph
null
After a short summary of our bimetric model of the Universe, an exact nonlinear solution is built, which demonstrates the existence of solutions for our two coupled field equations system. In addition to the classical positive gravitational lensing, this solution is shown to also lead to negative gravitational lensing, a phenomenon previously described in 1995 (Astrophysics and Space Science). Such negative lensing provides an alternative interpretation for the observed faint magnitudes of high redshift galaxies, so far considered as dwarf galaxies.
[ { "version": "v1", "created": "Wed, 9 Jan 2008 18:14:05 GMT" } ]
2008-12-08T00:00:00
[ [ "Petit", "Jean-Pierre", "" ], [ "d'Agostini", "Gilles", "" ] ]
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801.1478
Rafael Villarreal H
Luis A. Dupont and Rafael H. Villarreal
Algebraic and combinatorial properties of ideals and algebras of uniform clutters of TDI systems
Journal of Combinatorial Optimization, to appear
J. Comb. Optim. 21 (2011), no. 3, 269-292
null
null
math.AC math.CO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Let C be a uniform clutter, i.e., all the edges of C have the same size, and let A be the incidence matrix of C. We denote the column vectors of A by v1,...,vq. The vertex covering number of C, denoted by g, is the smallest number of vertices in any minimal vertex cover of C. Under certain conditions we prove that C is vertex critical. If C satisfies the max-flow min-cut property, we prove that A diagonalizes over the integers to an identity matrix and that v1,...,vq is a Hilbert basis. It is shown that if C has a perfect matching such that C has the packing property and g=2, then A diagonalizes over the integers to an identity matrix. If A is a balanced matrix we prove that any regular triangulation of the cone generated by v1,...,vq is unimodular. Some examples are presented to show that our results only hold for uniform clutters. These results are closely related to certain algebraic properties, such as the normality or torsion freeness, of blowup algebras of edge ideals and to finitely generated abelian groups. They are also related to the theory of Gr\"obner bases of toric ideals and to Ehrhart rings.
[ { "version": "v1", "created": "Wed, 9 Jan 2008 18:16:56 GMT" }, { "version": "v2", "created": "Wed, 27 May 2009 15:39:26 GMT" } ]
2011-04-05T00:00:00
[ [ "Dupont", "Luis A.", "" ], [ "Villarreal", "Rafael H.", "" ] ]
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801.1479
Victor Sanchez-Morcillo
Yu. N. Makov, V.J. Sanchez-Morcillo, F. Camarena and V. Espinosa
Nonlinear change of on-axis pressure and intensity maxima positions and its relation with the linear focal shift effect
12 pages, 3 figures
null
null
null
physics.flu-dyn
null
Experimental results related with the movement of the position of pressure and intensity maxima along the axis of focused acoustic beams under increasing driving voltages and its interpretation are presented. It is shown that in the nonlinear regime the points of the pressure and intensity maximum are separated and move differently along the axis, contrary to the linear regime, where these points coincide. The considered effects are particularly strong in the case of low-Fresnel-number beams.
[ { "version": "v1", "created": "Wed, 9 Jan 2008 18:18:10 GMT" } ]
2008-01-10T00:00:00
[ [ "Makov", "Yu. N.", "" ], [ "Sanchez-Morcillo", "V. J.", "" ], [ "Camarena", "F.", "" ], [ "Espinosa", "V.", "" ] ]
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801.148
Sumedha
Sumedha, Martin Weigt
A thermodynamic model for agglomeration of DNA-looping proteins
12 pages, 5 figures, to app. in JSTAT
J. Stat. Mech. (2008) P11005
10.1088/1742-5468/2008/11/P11005
null
q-bio.SC cond-mat.soft cond-mat.stat-mech physics.bio-ph q-bio.GN
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper, we propose a thermodynamic mechanism for the formation of transcriptional foci via the joint agglomeration of DNA-looping proteins and protein-binding domains on DNA: The competition between the gain in protein-DNA binding free energy and the entropy loss due to DNA looping is argued to result in an effective attraction between loops. A mean-field approximation can be described analytically via a mapping to a restricted random-graph ensemble having local degree constraints and global constraints on the number of connected components. It shows the emergence of protein clusters containing a finite fraction of all looping proteins. If the entropy loss due to a single DNA loop is high enough, this transition is found to be of first order.
[ { "version": "v1", "created": "Wed, 9 Jan 2008 18:21:04 GMT" }, { "version": "v2", "created": "Mon, 20 Oct 2008 16:37:38 GMT" } ]
2008-11-26T00:00:00
[ [ "Sumedha", "", "" ], [ "Weigt", "Martin", "" ] ]
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801.1481
Jian Hu
Jian Hu
The black hole mass -- stellar velocity dispersion correlation: bulges versus pseudobulges
12 pages, 5 figures, accepted by MNRAS
null
10.1111/j.1365-2966.2008.13195.x
null
astro-ph
null
We investigate the correlation between the supermassive black holes (SMBHs) mass ($M_{\rm bh}$) and the stellar velocity dispersion ($\sigma_*$) in two types of host galaxies: the early-type bulges (disk galaxies with classical bulges or elliptical galaxies) and pseudobulges. In the form $\log (M_{\rm bh}/{\rm M_\odot})=\alpha+\beta\log(\sigma_*/200 {\rm km s^{-1}})$, the best-fit results for the 39 early-type bulges are the slope $\beta=4.06\pm0.28$ and the normalization $\alpha=8.28\pm0.05$; the best-fit results for the 9 pseudobulges are $\beta=4.5\pm1.3$, $\alpha=7.50\pm0.18$. Both relations have intrinsic scatter in $\log M_{\rm bh}$ of $\lesssim$0.27 dex. The $M_{\rm bh}$-$\sigma_*$ relation for pseudobulges is different from the relation in the early-type bulges over the 3$\sigma$ significance level. The contrasting relations indicate the formation and growth histories of SMBHs depend on their host type. The discrepancy between the slope of the $M_{\rm bh}$-$\sigma_*$ relations using different definition of velocity dispersion vanishes in our sample, a uniform slope will constrain the coevolution theories of the SMBHs and their host galaxies more effectively. We also find the slope for the ``core'' elliptical galaxies at the high mass range of the relation appears steeper ($\beta\simeq$ 5-6), which may be the imprint of their origin of dissipationless mergers.
[ { "version": "v1", "created": "Wed, 9 Jan 2008 18:25:09 GMT" }, { "version": "v2", "created": "Thu, 10 Jan 2008 13:38:02 GMT" }, { "version": "v3", "created": "Tue, 4 Mar 2008 22:12:30 GMT" } ]
2009-11-13T00:00:00
[ [ "Hu", "Jian", "" ] ]
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801.1482
Robert W. Johnson Jr
Robert W. Johnson
Currents in a Tokamak
6 pages, 3 figures, uses revtex4
null
null
null
physics.plasm-ph
null
A self-consistent analysis of the currents in a tokamak yields the result that the parallel neutralizing current is given simply by the sum of currents commonly called the bootstrap current and the Pfirsch-Schlueter current. An expression is given relating the parallel and perpendicular pressure gradient induced species flow velocities to the total current.
[ { "version": "v1", "created": "Wed, 9 Jan 2008 18:25:15 GMT" } ]
2008-01-10T00:00:00
[ [ "Johnson", "Robert W.", "" ] ]
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801.1483
Dong Ye
Dong Ye, Zhongbin Qi and Heping Zhang
On k-resonant fullerene graphs
26 pages; 29 figures
SIAM J. DISCRETE MATH. Vol. 23 (2009) pp. 1023
null
null
math.CO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A fullerene graph $F$ is a 3-connected plane cubic graph with exactly 12 pentagons and the remaining hexagons. Let $M$ be a perfect matching of $F$. A cycle $C$ of $F$ is $M$-alternating if the edges of $C$ appear alternately in and off $M$. A set $\mathcal H$ of disjoint hexagons of $F$ is called a resonant pattern (or sextet pattern) if $F$ has a perfect matching $M$ such that all hexagons in $\mathcal H$ are $M$-alternating. A fullerene graph $F$ is $k$-resonant if any $i$ ($0\leq i \leq k$) disjoint hexagons of $F$ form a resonant pattern. In this paper, we prove that every hexagon of a fullerene graph is resonant and all leapfrog fullerene graphs are 2-resonant. Further, we show that a 3-resonant fullerene graph has at most 60 vertices and construct all nine 3-resonant fullerene graphs, which are also $k$-resonant for every integer $k>3$. Finally, sextet polynomials of the 3-resonant fullerene graphs are computed.
[ { "version": "v1", "created": "Wed, 9 Jan 2008 18:26:48 GMT" }, { "version": "v2", "created": "Tue, 11 Aug 2009 10:14:29 GMT" } ]
2009-08-11T00:00:00
[ [ "Ye", "Dong", "" ], [ "Qi", "Zhongbin", "" ], [ "Zhang", "Heping", "" ] ]
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801.1484
Petr Navratil
R. Roth, P. Navratil
Reply to Comment on ``Ab Initio Study of 40-Ca with an Importance Truncated No-Core Shell Model''
2 pages
Phys.Rev.Lett.101:119202,2008
10.1103/PhysRevLett.101.119202
LLNL-JRNL-400311
nucl-th
null
We respond to Comment on our recent letter (Phys.Rev.Lett.99:092501,2007) by Dean et al (arXiv:0709.0449).
[ { "version": "v1", "created": "Wed, 9 Jan 2008 18:33:08 GMT" } ]
2008-11-26T00:00:00
[ [ "Roth", "R.", "" ], [ "Navratil", "P.", "" ] ]
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801.1485
Nikitas Papasimakis
N. Papasimakis, V. A. Fedotov, S. L. Prosvirnin and N. I. Zheludev
A metamaterial analog of electromagnetically induced transparency
null
Phys. Rev. Lett. 101, 253903 (2008)
10.1103/PhysRevLett.101.253903
null
physics.optics
null
We present a new type of electromagnetic planar metamaterial that exhibit strong dispersion at a local minimum of losses and is believed to be the first metamaterial analog of electromagnetically induced transparency. We demonstrate that pulses propagating through such metamaterials experience considerable delay, whereas the thickness of the structure along the direction of wave propagation is much smaller than the wavelength, which allows successive stacking of multiple metamaterial slabs. This leads to a significant increase in the band of normal dispersion, as well as in transmission levels.
[ { "version": "v1", "created": "Wed, 9 Jan 2008 19:03:57 GMT" }, { "version": "v2", "created": "Thu, 10 Jan 2008 16:39:17 GMT" } ]
2010-09-03T00:00:00
[ [ "Papasimakis", "N.", "" ], [ "Fedotov", "V. A.", "" ], [ "Prosvirnin", "S. L.", "" ], [ "Zheludev", "N. I.", "" ] ]
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801.1486
Antonio Lopez Maroto
Jose Beltran Jimenez, Antonio L. Maroto
A cosmic vector for dark energy
5 pages, 3 figures, 1 table. New comments and references included. Final version to appear in Phys. Rev. D
Phys.Rev.D78:063005,2008
10.1103/PhysRevD.78.063005
null
astro-ph gr-qc hep-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this work we show that the presence of a vector field on cosmological scales could explain the present phase of accelerated expansion of the universe. The proposed theory contains no dimensional parameters nor potential terms and does not require unnatural initial conditions in the early universe, thus avoiding the so called cosmic coincidence problem. In addition, it fits the data from high-redshift supernovae with excellent precision, making definite predictions for cosmological parameters. Upcoming observations will be able to clearly discriminate this model from standard cosmology with cosmological constant.
[ { "version": "v1", "created": "Wed, 9 Jan 2008 19:19:57 GMT" }, { "version": "v2", "created": "Fri, 15 Aug 2008 11:23:23 GMT" } ]
2008-12-18T00:00:00
[ [ "Jimenez", "Jose Beltran", "" ], [ "Maroto", "Antonio L.", "" ] ]
[ 0.0347621962, 0.0857500285, -0.08427497, 0.0117082717, -0.1063024998, 0.0127346655, -0.0002869449, 0.097353816, -0.0822098926, 0.0201837085, -0.0659842566, 0.0525612272, -0.1086625904, -0.0133984424, 0.0855533555, 0.0116652492, -0.0827507451, 0.0707536042, 0.0364093445, 0.0372452103, -0.0694752261, -0.0244122073, 0.030877877, 0.0447925888, -0.0652467236, -0.1069908589, 0.0079714581, 0.0657384098, 0.1128910929, -0.0840291306, 0.0442025661, -0.0372943804, -0.0511353388, -0.0084938752, -0.0879626125, 0.1415072083, -0.049340684, -0.0376385599, -0.0719336569, -0.0990255475, -0.0540362857, -0.0047294041, -0.0156110292, 0.0703110918, -0.0504961461, -0.0165944006, -0.1115143746, -0.0896835178, -0.0507911593, -0.0513811819, -0.0660334229, -0.0364093445, 0.0259610172, -0.0038382234, -0.0468576699, -0.024694927, 0.0325987786, -0.0885034725, 0.0339509137, -0.0582156144, 0.01567249, -0.0829474181, -0.068246007, 0.0700160787, -0.0651975572, 0.0817182064, -0.0280998517, 0.0418916419, -0.0792106092, 0.0807840005, -0.0157216582, 0.0668692887, 0.0926336348, 0.0024507472, 0.0674101412, -0.0350326225, 0.0148243308, 0.0305091124, -0.0836849511, 0.0287882127, -0.0561013669, 0.0197411906, -0.0092559876, -0.0698685721, -0.0915519223, -0.0311974734, -0.0232936218, -0.0213883389, -0.0412770361, 0.029304482, 0.0112042939, 0.0309516303, -0.0721303299, -0.0131403068, 0.0066193221, 0.0721303299, 0.1044340953, 0.013078846, 0.1275433302, 0.0281981882, -0.0707536042, 0.0203189217, 0.1425889283, -0.0795547888, 0.0564947166, 0.0284194481, -0.0269689746, -0.0966162905, -0.0179957058, -0.0163116809, 0.0459234677, 0.0429733507, 0.0796531215, 0.0135459481, -0.0267477147, -0.0765063316, -0.1031557098, -0.0055929278, -0.0245720055, 0.0212162491, -0.0094403699, 0.0648042113, 0.1391471177, 0.0616574176, -0.0627391264, -0.1217414439, -0.0703602582, -0.0769488513, -0.0792106092, 0.0431700274, 0.0511353388, -0.0372943804, -0.0082480321, 0.0040133866, -0.1466207504, 0.0224946328, 0.0032082507, -0.0372206271, -0.0016302462, 0.0197043139, 0.0522170477, -0.0397773944, 0.0405149236, 0.0027780256, 0.064705871, 0.0082910545, -0.0349588692, 0.0491194278, 0.1277400106, -0.0522662178, -0.0424570814, -0.0085307509, 0.0491685942, -0.0726711825, -0.0055867815, -0.122823149, -0.0095264148, 0.0505944826, -0.0003749105, -0.0947970524, 0.0215604287, 0.0227773506, 0.0022909492, -0.0003028862, 0.0449892655, 0.0208966527, -0.0553638376, -0.0941086933, -0.0966162905, -0.1243965477, -0.0317874961, -0.0796531215, -0.1301001012, 0.006527131, 0.0488489978, 0.0942070261, -0.0183890536, -0.1177096143, 0.0010471374, -0.0263297819, 0.0462922305, 0.0816690326, 0.1157428697, -0.0603298657, -0.0480868854, 0.0109400125, 0.0138286669, 0.1069908589, 0.0001547082, -0.0443500727, -0.0392365381, 0.0426783413, 0.0485048182, 0.0657875761, -0.0001356938, -0.0785714164, 0.0269443896, 0.1020740047, 0.0286407061, -0.0270673111, 0.0152545562, 0.0522662178, 0.0037829087, -0.0834882706, -0.0560030304, -0.0561013669, 0.086290881, 0.0138409594, -0.0932728276, 0.0060231527, 0.0807840005, -0.029083224, 0.0561997034, -0.0321562625, -0.0814723596, -0.0611165613, 0.0243138708, 0.1223314628, 0.084078297, 0.0339263305, -0.1044340953, 0.1134811193, 0.022765059, -0.0390152782, 0.0623457767, -0.0503240563, 0.0191634595, -0.12537992, -0.0378106497, 0.0681476742, 0.0408836864, -0.0178973693, -0.0309024621, -0.0383269191, 0.0618049242, -0.1055158004, -0.0087704482, -0.0212162491, 0.0331642181, -0.0186840668, -0.0870775804, -0.0104360338, 0.062886633, 0.0538396128, -0.037613973, 0.0207491461, -0.0342213437, -0.041227866, 0.1324601918, -0.0452351086, 0.0891426653, 0.1321651787, -0.0487752445, -0.0136074089, 0.0156110292, 0.0455547012 ]
801.1487
Diego F. Torres
Agnieszka Sierpowska-Bartosik, Diego F. Torres
GLAST testing of a pulsar model matching H.E.S.S. observations of LS 5039
Accepted for publication in The Astrophysical Journal Letters
Astrophys.J.674:L89-L92,2008
10.1086/529376
null
astro-ph
null
LS 5039 is one of a handful of X-ray binaries that have been recently detected at high-energy $\gamma$-rays, in this case, by the High-Energy Stereoscopy Array (H.E.S.S.). The nature of this system is unknown: both a black hole and a pulsar have been invoked as possible compact object companions. Here we work with a model of the high energy phenomenology of the system in which it is assumed that the companion object is a pulsar rotating around an O6.5V star in the $\sim 3.9$ days orbit. The model assumes two different sets of power-law spectral parameters of the interacting primary leptons corresponding to the two orbital phase intervals defined by H.E.S.S. as having different gamma-ray spectra and very-high-energy (VHE) cutoffs. We show the H.E.S.S. phenomenology is completely explained by this model. We present predictions for photons with lower energies (for $E>1 $ GeV), subject to test in the forthcoming months with the GLAST satellite. We find that GLAST is able to judge on this model within one year.
[ { "version": "v1", "created": "Wed, 9 Jan 2008 18:59:56 GMT" } ]
2009-11-13T00:00:00
[ [ "Sierpowska-Bartosik", "Agnieszka", "" ], [ "Torres", "Diego F.", "" ] ]
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801.1488
Rogemar Andre Riffel
Rogemar A. Riffel, Thaisa Storchi-Bergmann, Claudia Winge, Peter J. McGregor, Tracy Beck, Henrique Schmitt
Mapping of the molecular gas inflow towards the Seyfert nucleus of NGC4051 using Gemini NIFS
paper accepted for publication in MNRAS, 17 pages, 10 figures
null
10.1111/j.1365-2966.2008.12936.x
null
astro-ph
null
We present two-dimensional (2D) stellar and gaseous kinematics of the inner ~130x180 pc^2 of the Narrow Line Seyfert 1 galaxy NGC4051 at a sampling of 4.5 pc, from near-infrared K-band spectroscopic observations obtained with the Gemini's Near-infrared Integral Field Spectrograph (NIFS). The turnover of the stellar rotation curve at only ~55 pc from the nucleus, revealing a highly concentrated gravitational potential. The stellar velocity dispersion of the bulge is ~60 km/s -- implying on a nuclear black hole mass of ~10^6 M_sun -- within which patches of lower velocity dispersion suggest the presence of regions of more recent star formation. The Brgamma emission-line shows no rotation as well as no blueshifts or redshifts in excess of 30 km/s, and is thus not restricted to the galaxy plane. The [CaVIII] coronal region is compact but resolved, extending over the inner 75 pc. It shows the highest blueshifts -- of up to -250 km/s, and the highest velocity dispersions, interpreted as due to outflows from the active nucleus, supporting an origin close to the nucleus. Subtraction of the stellar velocity field from the gaseous velocity field has allowed us to isolate non-circular motions observed in the H_2 emitting gas. The most conspicuous kinematic structures are two nuclear spiral arms. We interpret these structures as inflows towards the nucleus, a result similar to those of previous studies in which we have found streaming motions along nuclear spirals in ionized gas using optical IFU observations. We have calculated the mass inflow rate along the nuclear spiral arms, obtaining $\dot{M}_{H_2} ~ 4x10^{-5} M_Sun/yr, value ~100 times smaller than the accretion rate necessary to power the active nucleus.
[ { "version": "v1", "created": "Wed, 9 Jan 2008 19:10:15 GMT" }, { "version": "v2", "created": "Thu, 31 Jan 2008 17:24:04 GMT" } ]
2009-11-13T00:00:00
[ [ "Riffel", "Rogemar A.", "" ], [ "Storchi-Bergmann", "Thaisa", "" ], [ "Winge", "Claudia", "" ], [ "McGregor", "Peter J.", "" ], [ "Beck", "Tracy", "" ], [ "Schmitt", "Henrique", "" ] ]
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801.1489
Emerson Sadurni
Emerson Sadurni, Thomas H. Seligman
Relativistic echo dynamics and the stability of a beam of Landau electrons
8 pages, no figures
J.Phys.A41:102002,2008
10.1088/1751-8113/41/10/102002
null
quant-ph hep-th
null
We extend the concepts of echo dynamics and fidelity decay to relativistic quantum mechanics, specifically in the context of Klein-Gordon and Dirac equations under external electromagnetic fields. In both cases we define similar expressions for the fidelity amplitude under perturbations of these fields, and a covariant version of the echo operator. Transformation properties under the Lorentz group are established. An alternate expression for fidelity is given in the Dirac case in terms of a 4-current. As an application we study a beam of Landau electrons perturbed by field inhomogeneities.
[ { "version": "v1", "created": "Wed, 9 Jan 2008 19:29:32 GMT" }, { "version": "v2", "created": "Sat, 9 Feb 2008 19:03:30 GMT" }, { "version": "v3", "created": "Wed, 27 Feb 2008 19:43:57 GMT" } ]
2008-11-26T00:00:00
[ [ "Sadurni", "Emerson", "" ], [ "Seligman", "Thomas H.", "" ] ]
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801.149
Vali Bashiry
V. Bashiry
CP-Conserving Unparticle Phase Effects on the Unpolarized and Polarized Direct CP Asymmetry in $b \to d \ell^+\ell^-$ Transition
10 figures, PRD Published version
Phys.Rev.D77:096005,2008
10.1103/PhysRevD.77.096005
null
hep-ph
null
We examine the unparticle CP-conserving phase effects on the direct CP asymmetry for both polarized and unpolarized lepton in the inclusive $b\to d \ell^+ \ell^-$ transition, where the flavor changing neutral currents are forbidden at tree level but are induced by one-loop penguin diagrams. The averaged polarized and unpolarized CP asymmetries depict strong dependency on the unparticle parameters. In particular, a sizable discrepancy corresponding to the standard model is achieved when the scale dimension value is $1<d_{\UP}< 2$. We see that the unparticle stuff significantly enhances, suppresses or changes the sign of the CP asymmetry depending on the definite value of the scaling dimension $d_{\UP}$. Especially, when $d_{\UP}\sim 1.1$ the CP asymmetries vanish.
[ { "version": "v1", "created": "Wed, 9 Jan 2008 19:31:21 GMT" }, { "version": "v2", "created": "Wed, 14 May 2008 05:01:52 GMT" } ]
2008-11-26T00:00:00
[ [ "Bashiry", "V.", "" ] ]
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801.1491
Christian Reichardt
C. L. Reichardt, P. A. R. Ade, J. J. Bock, J. R. Bond, J. A. Brevik, C. R. Contaldi, M. D. Daub, J. T. Dempsey, J. H. Goldstein, W. L. Holzapfel, C. L. Kuo, A. E. Lange, M. Lueker, M. Newcomb, J. B. Peterson, J. Ruhl, M. C. Runyan, Z. Staniszewski
High resolution CMB power spectrum from the complete ACBAR data set
Submitted to ApJ; Changed to apply a WMAP5-based calibration. The cosmological parameter estimation has been updated to include WMAP5
Astrophys.J.694:1200-1219,2009
10.1088/0004-637X/694/2/1200
null
astro-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper, we present results from the complete set of cosmic microwave background (CMB) radiation temperature anisotropy observations made with the Arcminute Cosmology Bolometer Array Receiver (ACBAR) operating at 150 GHz. We include new data from the final 2005 observing season, expanding the number of detector-hours by 210% and the sky coverage by 490% over that used for the previous ACBAR release. As a result, the band-power uncertainties have been reduced by more than a factor of two on angular scales encompassing the third to fifth acoustic peaks as well as the damping tail of the CMB power spectrum. The calibration uncertainty has been reduced from 6% to 2.1% in temperature through a direct comparison of the CMB anisotropy measured by ACBAR with that of the dipole-calibrated WMAP5 experiment. The measured power spectrum is consistent with a spatially flat, LambdaCDM cosmological model. We include the effects of weak lensing in the power spectrum model computations and find that this significantly improves the fits of the models to the combined ACBAR+WMAP5 power spectrum. The preferred strength of the lensing is consistent with theoretical expectations. On fine angular scales, there is weak evidence (1.1 sigma) for excess power above the level expected from primary anisotropies. We expect any excess power to be dominated by the combination of emission from dusty protogalaxies and the Sunyaev-Zel'dovich effect (SZE). However, the excess observed by ACBAR is significantly smaller than the excess power at ell > 2000 reported by the CBI experiment operating at 30 GHz. Therefore, while it is unlikely that the CBI excess has a primordial origin; the combined ACBAR and CBI results are consistent with the source of the CBI excess being either the SZE or radio source contamination.
[ { "version": "v1", "created": "Wed, 9 Jan 2008 19:23:29 GMT" }, { "version": "v2", "created": "Thu, 10 Jan 2008 20:30:35 GMT" }, { "version": "v3", "created": "Fri, 7 Nov 2008 02:39:22 GMT" } ]
2009-06-23T00:00:00
[ [ "Reichardt", "C. L.", "" ], [ "Ade", "P. A. R.", "" ], [ "Bock", "J. J.", "" ], [ "Bond", "J. R.", "" ], [ "Brevik", "J. A.", "" ], [ "Contaldi", "C. R.", "" ], [ "Daub", "M. D.", "" ], [ "Dempsey", "J. T.", "" ], [ "Goldstein", "J. H.", "" ], [ "Holzapfel", "W. L.", "" ], [ "Kuo", "C. L.", "" ], [ "Lange", "A. E.", "" ], [ "Lueker", "M.", "" ], [ "Newcomb", "M.", "" ], [ "Peterson", "J. B.", "" ], [ "Ruhl", "J.", "" ], [ "Runyan", "M. C.", "" ], [ "Staniszewski", "Z.", "" ] ]
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801.1492
Axel Weber
Axel Weber
Muonium spectrum beyond the nonrelativistic limit
6 pages, LaTeX, 2 figures, uses aipxfm.sty. Talk delivered at the XI Mexican Workshop on Particles and Fields, Tuxtla Gutierrez, Mexico, November 7-12, 2007; to be published in the proceedings
AIPConf.Proc.1026:204-209,2008
10.1063/1.2965046
null
hep-th
null
A generalization of the Gell-Mann-Low theorem is applied to the antimuon-electron system. The bound state spectrum is extracted numerically. As a result, fine and hyperfine structure are reproduced correctly near the nonrelativistic limit (and for arbitrary masses). We compare the spectrum for the relativistic value alpha = 0.3 with corresponding calculations in light-front quantization.
[ { "version": "v1", "created": "Wed, 9 Jan 2008 19:52:07 GMT" } ]
2008-11-26T00:00:00
[ [ "Weber", "Axel", "" ] ]
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801.1493
Michael Singer
Charlotte Hardouin, Michael F. Singer
Differential Galois Theory of Linear Difference Equations
50 pages
null
null
null
math.CA
null
We present a Galois theory of difference equations designed to measure the differential dependencies among solutions of linear difference equations. With this we are able to reprove Hoelder's Theorem that the Gamma function satisfies no polynomial differential equation and are able to give general results that imply, for example, that no differential relationship holds among solutions of certain classes of q-hypergeometric functions.
[ { "version": "v1", "created": "Wed, 9 Jan 2008 19:58:31 GMT" } ]
2008-01-10T00:00:00
[ [ "Hardouin", "Charlotte", "" ], [ "Singer", "Michael F.", "" ] ]
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801.1494
Padelis Papadopoulos Dr
Padeli P. Papadopoulos, Ilana J. Feain, Jeff Wagg, David J. Wilner
A new twist to an old story: HE 0450-2958, and the ULIRG$\to $(optically bright QSO) transition hypothesis
25 pages, 5 figures, accepted for publication by The Astrophysical Journal
null
10.1086/590233
null
astro-ph
null
We report on interferometric imaging of the CO J=1--0 and J=3--2 line emission from the controversial QSO/galaxy pair HE 0450--2958. {\it The detected CO J=1--0 line emission is found associated with the disturbed companion galaxy not the luminous QSO,} and implies $\rm M_{gal}(H_2)\sim (1-2)\times 10^{10} M_{\odot}$, which is $\ga 30% $ of the dynamical mass in its CO-luminous region. Fueled by this large gas reservoir this galaxy is the site of an intense starburst with $\rm SFR\sim 370 M_{\odot} yr^{-1}$, placing it firmly on the upper gas-rich/star-forming end of Ultra Luminous Infrared Galaxies (ULIRGs, $\rm L_{IR}>10^{12} L_{\odot}$). This makes HE 0450--2958 the first case of extreme starburst and powerful QSO activity, intimately linked (triggered by a strong interaction) but not coincident. The lack of CO emission towards the QSO itself renews the controversy regarding its host galaxy by making a gas-rich spiral (the typical host of Narrow Line Seyfert~1 AGNs) less likely. Finally, given that HE 0450--2958 and similar IR-warm QSOs are considered typical ULIRG$\to $(optically bright QSO) transition candidates, our results raise the possibility that some may simply be {\it gas-rich/gas-poor (e.g. spiral/elliptical) galaxy interactions} which ``activate'' an optically bright unobscured QSO in the gas-poor galaxy, and a starburst in the gas-rich one. We argue that such interactions may have gone largely unnoticed even in the local Universe because the combination of tools necessary to disentagle the progenitors (high resolution and S/N optical {\it and} CO imaging) became available only recently.
[ { "version": "v1", "created": "Wed, 9 Jan 2008 19:54:45 GMT" }, { "version": "v2", "created": "Wed, 21 May 2008 17:01:04 GMT" } ]
2009-11-13T00:00:00
[ [ "Papadopoulos", "Padeli P.", "" ], [ "Feain", "Ilana J.", "" ], [ "Wagg", "Jeff", "" ], [ "Wilner", "David J.", "" ] ]
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801.1495
Yossi Farjoun
Yossi Farjoun and Benjamin Seibold
Solving One Dimensional Scalar Conservation Laws by Particle Management
15 pages, 6 figures. Submitted to proceedings of the Fourth International Workshop Meshfree Methods for Partial Differential Equations
Meshfree Methods for Partial Differential Equations IV, Lecture Notes in Computational Science and Engineering, Vol. 65, Springer, 2009, pp. 95-109
10.1007/978-3-540-79994-8_6
null
math.NA math-ph math.MP
null
We present a meshfree numerical solver for scalar conservation laws in one space dimension. Points representing the solution are moved according to their characteristic velocities. Particle interaction is resolved by purely local particle management. Since no global remeshing is required, shocks stay sharp and propagate at the correct speed, while rarefaction waves are created where appropriate. The method is TVD, entropy decreasing, exactly conservative, and has no numerical dissipation. Difficulties involving transonic points do not occur, however inflection points of the flux function pose a slight challenge, which can be overcome by a special treatment. Away from shocks the method is second order accurate, while shocks are resolved with first order accuracy. A postprocessing step can recover the second order accuracy. The method is compared to CLAWPACK in test cases and is found to yield an increase in accuracy for comparable resolutions.
[ { "version": "v1", "created": "Wed, 9 Jan 2008 20:15:33 GMT" } ]
2008-11-15T00:00:00
[ [ "Farjoun", "Yossi", "" ], [ "Seibold", "Benjamin", "" ] ]
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801.1496
Jonathan Irwin
Jonathan Irwin, David Charbonneau, Philip Nutzman, William F. Welsh, Abhijith Rajan, Marton Hidas, Timothy M. Brown, Timothy A. Lister, Donald Davies, Gregory Laughlin, Jonathan Langton
Parameters and Predictions for the Long-Period Transiting Planet HD 17156b
8 pages, 4 figures, 1 table, emulateapj format. v2: accepted for publication in ApJ, minor changes. Changed to emulateapj to save the rainforests
null
10.1086/588461
null
astro-ph
null
We report high-cadence time-series photometry of the recently-discovered transiting exoplanet system HD 17156, spanning the time of transit on UT 2007 October 1, from three separate observatories. We present a joint analysis of our photometry, previously published radial velocity measurements, and times of transit center for 3 additional events. Adopting the spectroscopically-determined values and uncertainties for the stellar mass and radius, we estimate a planet radius of Rp = 1.01 +/- 0.09 RJup and an inclination of i = 86.5 +1.1 -0.7 degrees. We find a time of transit center of Tc = 2454374.8338 +/- 0.0020 HJD and an orbital period of P = 21.21691 +/- 0.00071 days, and note that the 4 transits reported to date show no sign of timing variations that would indicate the presence of a third body in the system. Our results do not preclude the existence of a secondary eclipse, but imply there is only a 9.2% chance for this to be present, and an even lower probability (6.9%) that the secondary eclipse would be a non-grazing event. Due to its eccentric orbit and long period, HD 17156b is a fascinating object for the study of the dynamics of exoplanet atmospheres. To aid such future studies, we present theoretical light curves for the variable infrared emission from the visible hemisphere of the planet throughout its orbit.
[ { "version": "v1", "created": "Wed, 9 Jan 2008 20:32:51 GMT" }, { "version": "v2", "created": "Thu, 20 Mar 2008 13:32:21 GMT" } ]
2009-11-13T00:00:00
[ [ "Irwin", "Jonathan", "" ], [ "Charbonneau", "David", "" ], [ "Nutzman", "Philip", "" ], [ "Welsh", "William F.", "" ], [ "Rajan", "Abhijith", "" ], [ "Hidas", "Marton", "" ], [ "Brown", "Timothy M.", "" ], [ "Lister", "Timothy A.", "" ], [ "Davies", "Donald", "" ], [ "Laughlin", "Gregory", "" ], [ "Langton", "Jonathan", "" ] ]
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801.1497
John Davis
J.P. Davis, J. Pollanen, H. Choi, J.A. Sauls, and W.P. Halperin
Discovery of an Excited Pair State in Superfluid 3He
null
Nature Physics 4, 571 - 575 (2008)
10.1038/nphys969
null
cond-mat.supr-con cond-mat.str-el
null
Order parameter collective modes are the fingerprint of a condensed phase. The spectroscopy of these modes in superfluid $^3$He and unconventional superconductors can provide key information on the symmetry of the condensate as well as the microscopic pairing mechanism responsible for the ground state and excitation energies. We report the discovery of a new collective mode in superfluid $^3$He-B which we identify as an excited bound state of Cooper pairs. We use interferometry within an acoustic cavity that is very sensitive to changes in the velocity of transverse sound. Our measurements of sound velocity and mode frequency, together with the observation of acoustic birefringence indicate that this new mode is weakly bound with an excitation energy within 1% of the pair-breaking edge of $2\Delta$. Based on the selection rules for coupling of transverse sound to a collective mode in $^3$He-B, combined with the observation of acoustic birefringence near the collective mode frequency, we infer that the new mode is most likely a spin-triplet (S=1), $f$-wave pair exciton (L=3) with total angular momentum, J=4. The existence of a pair exciton with J=4 suggests an attractive, sub-dominant, $f$-wave pairing interaction in liquid $^3$He.
[ { "version": "v1", "created": "Wed, 9 Jan 2008 20:39:56 GMT" } ]
2009-02-13T00:00:00
[ [ "Davis", "J. P.", "" ], [ "Pollanen", "J.", "" ], [ "Choi", "H.", "" ], [ "Sauls", "J. A.", "" ], [ "Halperin", "W. P.", "" ] ]
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801.1498
William J. Briscoe
P. Golubev, V. Avdeichikov, K.G. Fissum, B. Jakobsson, I. A. Pshenichnov, W.J. Briscoe, G.V. O'Rielly, J. Annand, K. Hansen, L. Isaksson, H. Jaederstrom, M. Karlsson, M. Lundin, B. Schroeder, L. Westerberg
Pion emission in 2H, 12C, 27Al, gamma pi+ reactions at threshold
19 pages, 7 figures
Nucl.Phys.A806:216-229,2008
10.1016/j.nuclphysa.2008.02.308
Lund University Preprint, ISRN LUNFD6/NFFR-3105/1-19 (2007)
nucl-ex
null
The first data from MAX-lab in Lund, Sweden on pion production in photonuclear reactions at threshold energies, is presented. The decrease of the total yield of pi+ in gamma + 12C, 27Al reactions below 200 MeV as well as differential, dsigma/dOmega, cross sections follow essentially predictions from an intranuclear cascade model with an attractive potential for pion-nucleus interaction in its simplest form. Double differential, d2sigma/dOmegadT, cross sections at 176 MeV show, however, deviations from the model, which call for refinements of nuclear and Coulomb potentials and possibly also for coherent pion production mechanisms.
[ { "version": "v1", "created": "Wed, 9 Jan 2008 20:58:28 GMT" }, { "version": "v2", "created": "Tue, 19 Feb 2008 19:49:27 GMT" } ]
2008-11-26T00:00:00
[ [ "Golubev", "P.", "" ], [ "Avdeichikov", "V.", "" ], [ "Fissum", "K. G.", "" ], [ "Jakobsson", "B.", "" ], [ "Pshenichnov", "I. A.", "" ], [ "Briscoe", "W. J.", "" ], [ "O'Rielly", "G. V.", "" ], [ "Annand", "J.", "" ], [ "Hansen", "K.", "" ], [ "Isaksson", "L.", "" ], [ "Jaederstrom", "H.", "" ], [ "Karlsson", "M.", "" ], [ "Lundin", "M.", "" ], [ "Schroeder", "B.", "" ], [ "Westerberg", "L.", "" ] ]
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801.1499
John Smetanka
M. A. Maize and J. J. Smetanka
The dynamic electric polarizability of a particle bound by a double delta potential
11 pages, 5 figures
null
10.1088/0143-0807/29/3/010
null
math-ph math.MP
null
In this paper we derive an expression for the dynamic electric polarizability of a particle bound by a double delta potential for frequencies below and above the absolute value of the particle's ground state energy. The derived expression will be used to study some of the fundamental features of the system and its representation of real systems. In addition we derive a general expression of the dynamic electric polarizability for a potential of multi-delta functions.
[ { "version": "v1", "created": "Wed, 9 Jan 2008 20:50:56 GMT" } ]
2009-11-13T00:00:00
[ [ "Maize", "M. A.", "" ], [ "Smetanka", "J. J.", "" ] ]
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801.15
Michael McGuigan
Michael McGuigan
Toward the Graphics Turing Scale on a Blue Gene Supercomputer
9 pages, 4 figures, 6 tables
null
null
null
cs.GR
null
We investigate raytracing performance that can be achieved on a class of Blue Gene supercomputers. We measure a 822 times speedup over a Pentium IV on a 6144 processor Blue Gene/L. We measure the computational performance as a function of number of processors and problem size to determine the scaling performance of the raytracing calculation on the Blue Gene. We find nontrivial scaling behavior at large number of processors. We discuss applications of this technology to scientific visualization with advanced lighting and high resolution. We utilize three racks of a Blue Gene/L in our calculations which is less than three percent of the the capacity of the worlds largest Blue Gene computer.
[ { "version": "v1", "created": "Wed, 9 Jan 2008 20:51:02 GMT" } ]
2008-01-10T00:00:00
[ [ "McGuigan", "Michael", "" ] ]
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801.1501
Chow-Choong Ngeow
C. Ngeow (UIUC), S. Kanbur (SUNY-Oswego)
The Period-Luminosity Relation for the Large Magellanic Cloud Cepheids Derived from Spitzer Archival Data
10 pages, 11 figures and 6 tables, ApJ accepted
null
10.1086/586704
null
astro-ph
null
Using Spitzer archival data from the SAGE (Surveying the Agents of a Galaxy's Evolution) program, we derive the Cepheid period-luminosity (P-L) relation at 3.6, 4.5, 5.8 and 8.0 microns for Large Magellanic Cloud (LMC) Cepheids. These P-L relations can be used, for example, in future extragalactic distance scale studies carried out with the James Webb Space Telescope. We also derive Cepheid period-color (P-C) relations in these bands and find that the slopes of the P-C relations are relatively flat. We test the nonlinearity of these P-L relations with the F statistical test, and find that the 3.6 micron, 4.5 micron and 5.8 micron P-L relations are consistent with linearity. However the 8.0 micron P-L relation presents possible but inconclusive evidence of nonlinearity.
[ { "version": "v1", "created": "Wed, 9 Jan 2008 20:53:44 GMT" } ]
2009-11-13T00:00:00
[ [ "Ngeow", "C.", "", "UIUC" ], [ "Kanbur", "S.", "", "SUNY-Oswego" ] ]
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801.1502
Bernd Kniehl
Alexey Yu. Illarionov, Bernd A. Kniehl, Anatoly V. Kotikov
Heavy-quark contributions to the ratio F_L/F_2 at low x
11 pages, 1 figure
Phys.Lett.B663:66-72,2008
10.1016/j.physletb.2008.02.068
DESY 08-002
hep-ph hep-ex
null
We study the heavy-quark contribution to the proton structure functions F_2^i(x,Q^2) and F_L^i(x,Q^2), with i=c,b, for small values of Bjorken's x variable at next-to-lading order and provide compact formulas for their ratios R_i=F_L^i/F_2^i that are useful to extract F_2^i(x,Q^2) from measurements of the doubly differential cross section of inclusive deep-inelastic scattering at DESY HERA. Our approach naturally explains why R_i is approximately independent of x and the details of the parton distributions in the small-x regime.
[ { "version": "v1", "created": "Wed, 9 Jan 2008 20:54:59 GMT" } ]
2008-11-26T00:00:00
[ [ "Illarionov", "Alexey Yu.", "" ], [ "Kniehl", "Bernd A.", "" ], [ "Kotikov", "Anatoly V.", "" ] ]
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801.1503
Andrew Becker
Andrew C. Becker
Transient Detection and Classification
4 pages. In Proceedings of Hot-wiring the Transient Universe (HTU) 2007. To be published in Astronomische Nachrichten, March 2008
null
10.1002/asna.200710937
null
astro-ph
null
I provide an incomplete inventory of the astronomical variability that will be found by next-generation time-domain astronomical surveys. These phenomena span the distance range from near-Earth satellites to the farthest Gamma Ray Bursts. The surveys that detect these transients will issue alerts to the greater astronomical community; this decision process must be extremely robust to avoid a slew of ``false'' alerts, and to maintain the community's trust in the surveys. I review the functionality required of both the surveys and the telescope networks that will be following them up, and the role of VOEvents in this process. Finally, I offer some ideas about object and event classification, which will be explored more thoroughly by other articles in these proceedings.
[ { "version": "v1", "created": "Wed, 9 Jan 2008 20:55:17 GMT" } ]
2009-11-13T00:00:00
[ [ "Becker", "Andrew C.", "" ] ]
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801.1504
Aurel Bulgac
P. Magierski, G. Wlazlowski, A. Bulgac and J.E. Drut
The Finite Temperature Pairing Gap of a Unitary Fermi Gas by Quantum Monte Carlo Calculations
4 pages, 5 figures. Published version
Phys. Rev. Lett. 103, 210403 (2009)
10.1103/PhysRevLett.103.210403
null
cond-mat.stat-mech nucl-th
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We calculate the one-body temperature Green's (Matsubara) function of the unitary Fermi gas via Quantum Monte Carlo, and extract the spectral weight function $A(p,\omega)$ using the methods of maximum entropy and singular value decomposition. From $A(p,\omega)$ we determine the quasiparticle spectrum, which can be accurately parametrized by three functions of temperature: an effective mass $m^*$, a mean-field potential $U$, and a gap $\Delta$. Below the critical temperature $T_c=0.15\varepsilon_F$ the results for $m^*$, $U$ and $\Delta$ can be accurately reproduced using an independent quasiparticle model. We find evidence of a pseudogap in the fermionic excitation spectrum for temperatures up to {$T^*\approx 0.20\varepsilon_{F} > T_c$}.
[ { "version": "v1", "created": "Wed, 9 Jan 2008 20:58:39 GMT" }, { "version": "v2", "created": "Wed, 27 May 2009 21:24:28 GMT" }, { "version": "v3", "created": "Tue, 2 Jun 2009 16:53:51 GMT" }, { "version": "v4", "created": "Sun, 22 Nov 2009 20:23:19 GMT" } ]
2009-11-22T00:00:00
[ [ "Magierski", "P.", "" ], [ "Wlazlowski", "G.", "" ], [ "Bulgac", "A.", "" ], [ "Drut", "J. E.", "" ] ]
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801.1505
Aaron Dutton
Aaron A. Dutton (UCSC), Frank C. van den Bosch (MPIA), St\'ephane Courteau (Queen's)
The Tully-Fisher Zero Point Problem
4 pages, 1 figure, to appear in proceedings of "Formation and Evolution of Galaxy Disks", Rome, October 2007, Eds. J.G. Funes, S.J. and E.M. Corsini
null
null
null
astro-ph
null
A long standing problem for hierarchical disk galaxy formation models has been the simultaneous matching of the zero point of the Tully-Fisher relation and the galaxy luminosity function (LF). We illustrate this problem for a typical disk galaxy and discuss three solutions: low stellar mass-to-light ratios, low initial dark halo concentrations, and no halo contraction. We speculate that halo contraction may be reversed through a combination of mass ejection through feedback and angular momentum exchange brought about by dynamical friction between baryons and dark matter during the disk formation process.
[ { "version": "v1", "created": "Wed, 9 Jan 2008 21:00:23 GMT" } ]
2008-01-11T00:00:00
[ [ "Dutton", "Aaron A.", "", "UCSC" ], [ "Bosch", "Frank C. van den", "", "MPIA" ], [ "Courteau", "Stéphane", "", "Queen's" ] ]
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801.1506
Aaron Dutton
Aaron A. Dutton (UCSC), St\'ephane Courteau (Queen's)
Confronting Scaling Relations of Spiral Galaxies with Hierarchical Models of Disk Formation
4 pages, 1 figure, to appear in proceedings of "Formation and Evolution of Galaxy Disks", Rome, October 2007, Eds. J. Funes and E. M. Corsini
null
null
null
astro-ph
null
The scaling relations between rotation velocity, size and luminosity form a benchmark test for any theory of disk galaxy formation. We confront recent theoretical models of disk formation to a recent large compilation of such scaling relations. We stress the importance of achieving a fair comparison between models and observations.
[ { "version": "v1", "created": "Wed, 9 Jan 2008 21:00:30 GMT" } ]
2008-01-11T00:00:00
[ [ "Dutton", "Aaron A.", "", "UCSC" ], [ "Courteau", "Stéphane", "", "Queen's" ] ]
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801.1507
Oksana Zaharko
O. Zaharko, J. Mesot, L. A. Salguero, R. Valenti, M. Zbiri, M. Johnson, Y. Filinchuk, B. Klemke, K. Kiefer, M. Mys'kiv, T. Straessle, H. Mutka
Tetrahedra system Cudaca: high-temperature manifold of molecular configurations governing low-temperature properties
15 figures
null
10.1103/PhysRevB.77.224408
null
cond-mat.mtrl-sci
null
The Cudaca system composed of isolated Cu2+ S=1/2 tetrahedra with antiferromagnetic exchange should exhibit properties of a frustrated quantum spin system. ab initio density functional theory calculations for electronic structure and molecular dynamics computations suggest a complex interplay between magnetic exchange, electron delocalization and molecular vibrations. Yet, extensive experimental characterization of Cudaca by means of synchrotron x-ray diffraction, magnetization, specific heat and inelastic neutron scattering reveal that properties of the real material can be only partly explained by proposed theoretical models as the low temperature properties seem to be governed by a manifold of molecular configurations coexisting at high temperatures.
[ { "version": "v1", "created": "Wed, 9 Jan 2008 21:34:44 GMT" }, { "version": "v2", "created": "Fri, 9 May 2008 07:02:16 GMT" } ]
2009-11-13T00:00:00
[ [ "Zaharko", "O.", "" ], [ "Mesot", "J.", "" ], [ "Salguero", "L. A.", "" ], [ "Valenti", "R.", "" ], [ "Zbiri", "M.", "" ], [ "Johnson", "M.", "" ], [ "Filinchuk", "Y.", "" ], [ "Klemke", "B.", "" ], [ "Kiefer", "K.", "" ], [ "Mys'kiv", "M.", "" ], [ "Straessle", "T.", "" ], [ "Mutka", "H.", "" ] ]
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801.1508
James Gray
James Gray, Yang-Hui He, Anton Ilderton and Andr\'e Lukas
STRINGVACUA: A Mathematica Package for Studying Vacuum Configurations in String Phenomenology
21 pages, 9 figures
Comput.Phys.Commun.180:107-119,2009
10.1016/j.cpc.2008.08.009
null
hep-th
null
We give a simple tutorial introduction to the Mathematica package STRINGVACUA, which is designed to find vacua of string-derived or inspired four-dimensional N=1 supergravities. The package uses powerful algebro-geometric methods, as implemented in the free computer algebra system Singular, but requires no knowledge of the mathematics upon which it is based. A series of easy-to-use Mathematica modules are provided which can be used both in string theory and in more general applications requiring fast polynomial computations. The use of these modules is illustrated throughout with simple examples.
[ { "version": "v1", "created": "Wed, 9 Jan 2008 21:26:56 GMT" } ]
2008-12-18T00:00:00
[ [ "Gray", "James", "" ], [ "He", "Yang-Hui", "" ], [ "Ilderton", "Anton", "" ], [ "Lukas", "André", "" ] ]
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801.1509
David Wilson Dr
D.M. Wilson, M. Gillon, C. Hellier, P.F.L. Maxted, F. Pepe, D. Queloz, D.R. Anderson, A. Collier Cameron, B. Smalley, T.A. Lister, S.J. Bentley, A. Blecha, D.J. Christian, B. Enoch, C.A. Haswell, L. Hebb, K. Horne, J. Irwin, Y.C. Joshi, S.R. Kane, M. Marmier, M. Mayor, N. Parley, D. Pollacco, F. Pont, R. Ryans, D. Segransan, I. Skillen, R.A. Street, S. Udry, R.G. West, P.J. Wheatley
WASP-4b: a 12th-magnitude transiting hot-Jupiter in the Southern hemisphere
Added 3 new RV measurements and resultant fit parameters updated. Minor revisions to text. 7 pages incl. 4 figures. Accepted for publication in ApJL
null
10.1086/586735
null
astro-ph
null
We report the discovery of WASP-4b, a large transiting gas-giant planet with an orbital period of 1.34 days. This is the first planet to be discovered by the SuperWASP-South observatory and CORALIE collaboration and the first planet orbiting a star brighter than 16th magnitude to be discovered in the Southern hemisphere. A simultaneous fit to high-quality lightcurves and precision radial-velocity measurements leads to a planetary mass of 1.22 +/- 0.1 MJup and a planetary radius of 1.42 +/- 0.08 RJup. The host star is USNO-B1.0 0479-0948995, a G7V star of visual magnitude 12.5. As a result of the short orbital period, the predicted surface temperature of the planet is 1776 K, making it an ideal candidate for detections of the secondary eclipse at infrared wavelengths.
[ { "version": "v1", "created": "Wed, 9 Jan 2008 21:03:19 GMT" }, { "version": "v2", "created": "Thu, 7 Feb 2008 12:29:59 GMT" } ]
2009-11-13T00:00:00
[ [ "Wilson", "D. M.", "" ], [ "Gillon", "M.", "" ], [ "Hellier", "C.", "" ], [ "Maxted", "P. F. L.", "" ], [ "Pepe", "F.", "" ], [ "Queloz", "D.", "" ], [ "Anderson", "D. R.", "" ], [ "Cameron", "A. Collier", "" ], [ "Smalley", "B.", "" ], [ "Lister", "T. A.", "" ], [ "Bentley", "S. J.", "" ], [ "Blecha", "A.", "" ], [ "Christian", "D. J.", "" ], [ "Enoch", "B.", "" ], [ "Haswell", "C. A.", "" ], [ "Hebb", "L.", "" ], [ "Horne", "K.", "" ], [ "Irwin", "J.", "" ], [ "Joshi", "Y. C.", "" ], [ "Kane", "S. R.", "" ], [ "Marmier", "M.", "" ], [ "Mayor", "M.", "" ], [ "Parley", "N.", "" ], [ "Pollacco", "D.", "" ], [ "Pont", "F.", "" ], [ "Ryans", "R.", "" ], [ "Segransan", "D.", "" ], [ "Skillen", "I.", "" ], [ "Street", "R. A.", "" ], [ "Udry", "S.", "" ], [ "West", "R. G.", "" ], [ "Wheatley", "P. J.", "" ] ]
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801.151
Christopher Night
Rosanne Di Stefano and Christopher Night
Discovery and Study of Nearby Habitable Planets with Mesolensing
12 pages, 3 figures, 1 table
null
null
null
astro-ph
null
We demonstrate that gravitational lensing can be used to discover and study planets in the habitable zones of nearby dwarf stars. If appropriate software is developed, a new generation of monitoring programs will automatically conduct a census of nearby planets in the habitable zones of dwarf stars. In addition, individual nearby dwarf stars can produce lensing events at predictable times; careful monitoring of these events can discover any planets located in the zone of habitability. Because lensing can discover planets (1) in face-on orbits, and (2) in orbit around the dimmest stars, lensing techniques will provide complementary information to that gleaned through Doppler and/or transit investigations. The ultimate result will be a comprehensive understanding of the variety of systems with conditions similar to those that gave rise to life on Earth.
[ { "version": "v1", "created": "Wed, 9 Jan 2008 21:06:22 GMT" } ]
2008-01-11T00:00:00
[ [ "Di Stefano", "Rosanne", "" ], [ "Night", "Christopher", "" ] ]
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801.1511
Rosanne Di Stefano
R. Di Stefano
Discovery and Study of Nearby Planetary and Binary Systems Via Mesolensing
12 pages, 4 figures, submitted to ApJL 14 September 2007
null
null
null
astro-ph
null
This paper is devoted to exploring how we can discover and study nearby (< 1-2 kpc) planetary and binary systems by observing their action as gravitational lenses. Lensing can extend the realm of nearby binaries and planets that can be systematically studied to include dark and dim binaries, and face-on systems. As with more traditional studies, which use light from the system, orbital parameters (including the total mass, mass ratio, and orbital separation) can be extracted from lensing data, Also in common with these traditional methods, individual systems can be targeted for study. We discuss the specific observing strategies needed in order to optimize the discovery and study of nearby planetary and binary systems by observing their actions as lenses.
[ { "version": "v1", "created": "Wed, 9 Jan 2008 21:19:47 GMT" } ]
2008-01-11T00:00:00
[ [ "Di Stefano", "R.", "" ] ]
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801.1512
Petros Galanopoulos
Petros Galanopoulos
Theory of Bergman spaces (I)
null
null
null
null
math.CV
null
These notes are part of the research seminar with title "Theory of Bergman spaces and related function spaces" that took place in the University of Crete, Department of Mathematics (September 2006- December 2007), in the framework of the research program PYTHAGORAS II(75% European funds--25% Greek national funds).
[ { "version": "v1", "created": "Wed, 9 Jan 2008 21:19:59 GMT" } ]
2008-01-11T00:00:00
[ [ "Galanopoulos", "Petros", "" ] ]
[ -0.1186526567, 0.0056152758, 0.0584455021, 0.002768778, -0.0637304634, -0.012098426, 0.0173704382, -0.0114766657, 0.0120401364, 0.008244805, -0.0890154019, -0.0518392958, -0.0118523128, -0.0716579184, -0.0681346059, 0.1286008209, -0.0249999594, 0.0303367376, 0.0851293951, 0.0234585106, 0.0099611236, -0.0647149235, -0.0854920894, 0.039922215, -0.0099416934, -0.1040412858, 0.0438859388, 0.0947148725, 0.0543004312, -0.0251294933, 0.1461137533, -0.0330569409, -0.0231994446, -0.0443004481, -0.0371502005, 0.137098223, 0.0121567156, 0.0875646248, 0.0097927302, 0.0696371943, -0.0537822954, 0.0491709039, -0.0434196182, 0.1284971982, -0.0348185971, -0.0055764159, 0.0113730384, 0.0344559029, 0.0047506401, -0.0260621347, 0.0071049109, -0.0625905693, 0.0734713823, -0.0460880101, -0.1160619855, -0.0904143602, -0.1416577995, 0.0083808154, 0.0278496966, -0.0007346976, 0.0194947869, -0.1035231501, 0.0268134288, -0.0897926018, -0.1387562454, 0.0133419475, -0.1210360751, 0.0322538354, 0.0437823124, 0.0799480602, 0.0083290022, 0.021334162, 0.0194170661, 0.1656992137, -0.0173056722, 0.0605698489, 0.042150192, 0.0802071244, 0.0027347754, 0.0526942164, 0.0565802194, 0.0340154879, 0.0149222557, -0.0118652657, -0.0380310267, -0.0607252903, -0.0373574533, -0.009203353, -0.025155399, 0.0025663818, 0.0491709039, 0.0184585191, -0.031010313, -0.001125322, 0.1345075518, -0.0705180168, 0.0739377066, -0.0351812914, 0.0330051295, -0.0111074951, -0.0565284044, -0.1194816753, 0.0438600332, -0.075440295, 0.0894299075, -0.0226294976, -0.0046016765, 0.0348185971, -0.0458289422, 0.0300258584, -0.164144814, -0.0107059414, 0.0492745303, 0.1163728684, 0.0707252771, -0.0130634503, -0.0412434563, -0.0108289979, -0.0539377369, 0.0454921536, 0.0018361369, 0.043549154, -0.0119106025, -0.0081929918, 0.0962174609, -0.0217616223, -0.0240284577, -0.0374610797, -0.0856475309, -0.0028902155, 0.0721242353, -0.0605180375, 0.0575646721, -0.07015533, -0.057875555, -0.0034132069, 0.0365025327, -0.0359066762, 0.0834713653, -0.0041580242, 0.0605698489, -0.0129792532, -0.011463712, 0.079585366, -0.0027202028, 0.029352285, -0.0888599604, 0.1779271662, 0.1364764571, -0.0274870023, 0.0379792117, -0.0253367461, 0.0099157868, 0.0340673029, 0.0426942296, -0.0501294509, 0.0565802194, 0.0391968265, -0.0160621498, 0.0011755163, 0.0969946608, 0.0705180168, -0.0253367461, 0.0959583968, 0.0695853829, 0.1509842128, -0.0579273663, -0.0130440202, -0.0640413463, -0.0769946948, -0.0800516829, -0.1601033658, -0.0826423541, 0.030880779, 0.0295336302, 0.0295854434, -0.0155181093, -0.0293004699, -0.0138600813, 0.0093264095, -0.0430828333, 0.1277718097, 0.0106541282, -0.0028222105, -0.0573056079, 0.0563729666, 0.0148315821, 0.0370206647, -0.0000680051, 0.0934713483, 0.0496631302, -0.0002113015, 0.090621613, 0.1211396977, -0.0543522425, -0.0570983514, -0.0961656496, 0.0336268879, -0.042720139, 0.0342486501, 0.0366061591, 0.0318134204, 0.0247408934, 0.0222927108, -0.0706734583, -0.0305958055, 0.0368652269, 0.0519947335, -0.0185880531, 0.0199352, 0.0017130801, -0.0844558254, -0.015155416, 0.05132116, -0.0064280983, -0.027512908, -0.0529014692, 0.1244557574, 0.0445595123, 0.1534712613, -0.0871501192, -0.0008848755, 0.0802071244, -0.0280051362, 0.1080827266, 0.0348185971, 0.0493004397, 0.0259973668, -0.0056962343, -0.0590154491, 0.1090153679, 0.0893262774, -0.0703625828, 0.0499221981, 0.0093717463, 0.0815024599, 0.0243781991, -0.008471489, -0.1208288223, -0.0646631047, -0.0118782194, 0.0693781227, -0.0004477001, -0.0349222235, -0.0657511875, -0.0076813349, -0.0199481547, 0.0363729969, 0.027823789, 0.0363470912, -0.0871501192, -0.0290932171, 0.0135103408, 0.0708288997, 0.021904109, 0.00469235 ]
801.1513
Stefano Vidussi
Stefan Friedl, Stefano Vidussi
Symplectic 4-manifolds with a free circle action
This paper has been withdrawn
null
null
null
math.GT math.SG
null
The content of this unpublished paper is subsumed in successive work of the authors, in particular arXiv:1102.0820, arXiv:1102.0821 and arXiv:1205.2434.
[ { "version": "v1", "created": "Wed, 9 Jan 2008 21:39:35 GMT" }, { "version": "v2", "created": "Tue, 15 May 2012 05:18:20 GMT" } ]
2012-05-16T00:00:00
[ [ "Friedl", "Stefan", "" ], [ "Vidussi", "Stefano", "" ] ]
[ -0.0197884329, 0.011270348, -0.0443613902, -0.0060677556, 0.0139819672, 0.0288465172, -0.0470323674, 0.027847806, 0.0069967904, -0.0690737069, 0.0507717282, -0.0462891385, -0.021600049, -0.0066658217, 0.058157552, 0.0296594221, 0.0306813605, 0.0301471651, 0.1130634844, 0.1311796606, 0.0968053862, -0.0946686044, 0.0176284276, 0.0163974576, -0.0188477859, -0.0139471283, -0.029078776, 0.0657756329, 0.000032117, 0.0234465059, 0.0503536649, -0.0463123657, 0.020984564, 0.008483245, -0.1114841253, 0.1246764138, 0.0136335799, 0.1598868221, -0.0968982875, 0.0239458606, 0.030890394, 0.0580646507, 0.0516543128, -0.0059109814, 0.0949008614, 0.0151432604, 0.0250142515, 0.127277717, 0.0579717457, 0.004758398, -0.0018159719, 0.0034461368, 0.0702349991, -0.0788750201, -0.0775279179, -0.0039629121, -0.0730685517, -0.0350478217, 0.0068516284, 0.0224942453, 0.010103249, -0.0536052845, 0.0131458361, 0.0171058457, -0.1043305621, 0.070467256, -0.0393213816, -0.0066600153, 0.0248981211, 0.0934608579, -0.0066948542, 0.05290851, 0.1124131605, 0.1470661461, 0.0503536649, 0.0353497565, 0.0573214218, 0.1089757308, 0.0675408021, 0.0602943301, 0.098384738, 0.0335613675, 0.0301936176, 0.0042793648, -0.1387048364, -0.1158505902, 0.011949705, 0.0447097793, 0.0003211701, -0.0088258265, 0.1137138084, -0.0637782142, -0.0910453722, -0.0782246962, 0.1130634844, -0.0650324076, -0.0629420802, 0.064056918, 0.0096967965, 0.0281032901, 0.0111890575, -0.0762272701, -0.0582040027, -0.0234348923, 0.0741369426, 0.1387048364, 0.016676167, 0.0412955768, -0.0054696901, -0.036464598, 0.0000028976, -0.006944532, -0.107860893, 0.0988492593, 0.039994929, -0.0257574786, -0.0995924845, -0.0092148595, -0.0240852162, 0.0126348678, -0.0313549116, -0.0154568097, 0.0083032446, -0.0255252197, 0.0682840273, -0.0920208544, -0.0082625998, -0.1203099564, -0.0920208544, -0.0492388234, 0.05537045, -0.0459175259, 0.0329110436, -0.0769704953, 0.0380904116, 0.0758092031, 0.0499820486, 0.0561136752, 0.1152931675, -0.0322374925, 0.0453833304, 0.0088026011, 0.0343045965, 0.1601655334, 0.1139925197, 0.0229355358, -0.0541162528, 0.1066531464, -0.0509575345, 0.0320516862, 0.0185110103, 0.0106142182, 0.0927640796, 0.0334452391, -0.0954118297, -0.0177561697, 0.0663795099, -0.0068400158, -0.0012955675, -0.0031877493, 0.0849137455, -0.0359536298, -0.0651253089, 0.0013412934, 0.0791072771, 0.0760879144, -0.000764276, -0.0302168429, -0.0557420626, -0.1653681248, 0.0071013067, -0.086400196, -0.1400983781, 0.0884440765, 0.0019495205, 0.0671227351, -0.07376533, -0.098570548, -0.0725575835, 0.0367433093, 0.1257912517, 0.107860893, 0.0585291646, -0.0355355665, -0.0230981167, 0.0448026843, -0.0211006943, 0.0001261092, 0.0305187795, 0.0690272525, -0.0747408196, 0.0598762669, -0.0190684311, 0.0086980844, 0.0214606952, -0.098384738, 0.0359304063, 0.0083380835, -0.0599691682, 0.0339329801, 0.0522581823, -0.0218439214, -0.0637782142, 0.0168271344, -0.0186852049, -0.0486349501, 0.0066367895, 0.0747408196, -0.0359071791, 0.0798505023, -0.0189639144, -0.0629885346, 0.0019030689, 0.0881653652, -0.0454297811, 0.045754943, 0.0628491789, -0.0189058501, 0.024967799, 0.0823124498, -0.0907202065, 0.0242710225, 0.0013470999, 0.0440594554, 0.1432570964, -0.0173148792, -0.0993137732, -0.0311691035, -0.1038660407, 0.0170361679, 0.0569033548, 0.0589472316, -0.1245835125, 0.0247819927, -0.0317729749, -0.0208916608, -0.0191961732, 0.0044506555, -0.0204852074, -0.0206477884, 0.0553239994, -0.0541162528, 0.0399020277, 0.0270349011, -0.0735330731, 0.0155264875, 0.0048280754, 0.0097432481, 0.049703341, -0.0038119443, 0.0536052845, 0.0824982524, -0.0883511677, 0.0652182102, -0.0593188442, 0.0273368359 ]
801.1514
Grenville Croll
David Chadwick, Rodney E. Sue
Teaching spreadsheet development using peer audit and self-audit methods for reducing error
9 Pages, includes references
European Spreadsheet Risks Int. Grp. 2001 95-105 ISBN:1 86166 179 7
null
null
cs.CY
null
Recent research has highlighted the high incidence of errors in spreadsheet models used in industry. In an attempt to reduce the incidence of such errors, a teaching approach has been devised which aids students to reduce their likelihood of making common errors during development. The approach comprises of spreadsheet checking methods based on the commonly accepted educational paradigms of peer assessment and self-assessment. However, these paradigms are here based upon practical techniques commonly used by the internal audit function such as peer audit and control and risk self-assessment. The result of this symbiosis between educational assessment and professional audit is a method that educates students in a set of structured, transferable skills for spreadsheet error-checking which are useful for increasing error-awareness in the classroom and for reducing business risk in the workplace.
[ { "version": "v1", "created": "Wed, 9 Jan 2008 21:58:45 GMT" } ]
2008-03-13T00:00:00
[ [ "Chadwick", "David", "" ], [ "Sue", "Rodney E.", "" ] ]
[ -0.0265805814, 0.0456958674, 0.0674717948, 0.0238036979, 0.0130900964, 0.0137810884, 0.0095834751, 0.0973846316, -0.0005174366, 0.0533678122, 0.1410398185, -0.0610139258, 0.0349241458, 0.0591023974, 0.071914807, -0.0019664206, 0.0604456365, 0.0183403417, -0.0551760159, 0.0787859783, 0.0796125829, 0.0735163614, 0.0547110476, 0.1167582348, 0.0383080654, -0.0862771049, 0.0405554064, -0.0096803429, 0.018869888, -0.0620988496, 0.0371973142, -0.0624604896, -0.0019325167, 0.0705715716, -0.0526445322, 0.098004587, -0.0340975374, 0.0721731186, 0.0622021742, -0.1340136528, 0.0120697534, -0.0020261558, 0.0091507975, 0.128744036, -0.0270197149, -0.007814019, -0.0657152534, -0.0138198351, 0.0938198939, -0.0277429968, -0.1104553565, 0.0550210252, 0.0997611284, -0.0308427736, -0.0428285748, 0.0302486494, -0.1021376252, 0.0642686933, -0.1048757583, 0.013161133, 0.1341169775, 0.0365773588, -0.1172748655, 0.0392121673, -0.072328113, -0.0309460983, -0.0858121365, 0.017733302, -0.0537294522, -0.0121924533, 0.0401421003, 0.0343041904, 0.0856054872, -0.0031691983, -0.0572425313, -0.1108686626, 0.0173458308, 0.0769777745, 0.0034194405, 0.0849338695, 0.1500291675, -0.0173070841, 0.0509138219, -0.0017775279, -0.0723797753, -0.0762544945, -0.1115919426, 0.0389280207, -0.1032742113, -0.0646819994, -0.097694613, 0.063493751, -0.0284404457, 0.0219954941, 0.0744462907, 0.0466258004, -0.0798192397, 0.0207168367, 0.1433129907, -0.072638087, 0.0162738245, 0.0250565242, 0.0454633832, 0.0866904035, 0.0638553873, -0.0320826843, 0.0164288133, -0.0346399993, -0.0677817687, -0.0276655015, -0.1549888104, -0.0035808873, -0.0431902148, -0.0224217139, 0.0843655765, -0.0304036383, 0.0142848017, -0.1010527015, -0.0009872464, -0.0416144952, -0.0257152263, -0.0397029668, 0.0679367632, -0.1372167617, 0.0933032632, -0.0525153764, -0.0569325574, -0.0491056219, 0.0370681584, -0.1166549101, 0.090306811, 0.0058088512, 0.0330384485, -0.0902551487, -0.0294478741, -0.0151114091, -0.0899451748, 0.0660768971, -0.0311785825, -0.0121278744, 0.0271230415, 0.0894802064, -0.0426994152, 0.0651986226, -0.0576041751, -0.0477365516, 0.0433710366, 0.0363448747, -0.0229125116, 0.1165515855, -0.0648886487, 0.013884414, -0.0874653533, 0.0398579538, 0.0211430565, -0.0376364477, -0.0225121249, 0.0418728106, -0.0161575824, -0.0951114669, 0.0287762545, 0.0442234725, -0.013794004, -0.008866651, -0.0054504396, -0.0307136159, -0.0692283362, -0.0449209213, -0.1365967989, -0.0410720333, -0.1153116748, -0.0257023107, 0.0998644531, -0.0525670387, 0.0752728954, 0.0151114091, 0.0032192466, -0.0388505273, 0.0096997162, -0.0260122884, -0.1675945669, -0.0278463233, 0.0226800293, 0.0348724835, 0.0474007428, -0.0728964061, 0.0506038442, -0.1108686626, 0.0444042943, -0.0182499327, -0.0306877848, 0.0058314539, -0.0114175091, 0.0766678005, -0.0389796868, -0.0300419983, 0.066541858, 0.0423636064, -0.0337358974, -0.0412011929, -0.0251469333, -0.0775977299, -0.0216726009, -0.0337617286, 0.0427252464, 0.0064417222, -0.0615822189, 0.0654052794, -0.0446367785, -0.0411753617, 0.0700549409, -0.0289312433, 0.0362157188, 0.1086988151, -0.025482744, 0.0304811317, 0.0584307797, -0.0317985378, 0.064785324, 0.056260936, -0.0240490977, -0.025030693, 0.0504488572, 0.0413303487, -0.0223829672, 0.0351307951, 0.0705199093, 0.0355441011, 0.0380239226, -0.1137617826, -0.0192831904, -0.1302939206, -0.0622538365, 0.0489248, 0.0909784287, 0.0065224455, -0.0227058604, -0.0398579538, -0.0547627136, 0.0718631446, 0.019050708, 0.0694349855, -0.0398579538, -0.056467589, -0.0539877675, 0.104100816, -0.0738263354, -0.0495705865, -0.0575008467, 0.0459541827, 0.0035841162, -0.0699516162, 0.0640103742, -0.0312044136, -0.0577074997, -0.0550726913 ]
801.1515
Nam Dao
D. N. H. Nam, N. C. Thuan, L. V. Hong, N. X. Phuc, S. A. Wolf, N. V. Dai, and Y. P. Lee
Impact of in-plane currents on magnetoresistance properties of an exchange-biased spin-valve with insulating antiferromagnetic layer
null
null
null
null
cond-mat.mtrl-sci cond-mat.other
null
The impact of in-plane alternating currents on the exchange bias, resistance, and magnetoresistance of a CoFe/NiCoO/CoFe/Cu/CoFe spin-valve is studied. With increasing current, the resistance is increased while the maximum magnetoresistance ratio decreases. Noticeably, the reversal of the pinned layer is systematically suppressed in both field sweeping directions. Since the NiCoO oxide is a good insulator, it is expected that the ac current flows only in the CoFe/Cu/CoFe top layers, thus ruling out any presence of spin-transfer torque acting on the spins in the antiferromagnetic layer. Instead, our measurements show clear evidences for the influence of Joule heating caused by the current. Moreover, results from temperature-dependent measurements very much resemble those of the current dependence, indicating that the effect of Joule heating plays a major role in the current-in-plane spin-valve configurations. The results also suggest that spin-transfer torques between ferromagnetic layers might still exist and compete with the exchange bias at sufficiently high currents.
[ { "version": "v1", "created": "Wed, 9 Jan 2008 22:08:44 GMT" } ]
2008-01-11T00:00:00
[ [ "Nam", "D. N. H.", "" ], [ "Thuan", "N. C.", "" ], [ "Hong", "L. V.", "" ], [ "Phuc", "N. X.", "" ], [ "Wolf", "S. A.", "" ], [ "Dai", "N. V.", "" ], [ "Lee", "Y. P.", "" ] ]
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801.1516
Grenville Croll
Kamalasen Rajalingham, David Chadwick, Brian Knight
An Evaluation of a Structured Spreadsheet Development Methodology
17 pages including references
European Spreadsheet Risks Int. Grp. 2001 39-59 ISBN:1 86166 179
null
null
cs.CY
null
This paper presents the results of an empirical evaluation of the quality of a structured methodology for the development of spreadsheet models, proposed in numerous previous papers by Rajalingham K, Knight B and Chadwick D et al. This paper also describes an improved version of their methodology, supported by appropriate examples. The principal objective of a structured and disciplined methodology for the construction of spreadsheet models is to reduce the occurrence of user-generated errors in the models. The evaluation of the effectiveness of the methodology has been carried out based on a number of real-life experiments. The results of these experiments demonstrate the methodology's potential for improved integrity control and enhanced comprehensibility of spreadsheet models.
[ { "version": "v1", "created": "Wed, 9 Jan 2008 22:12:13 GMT" } ]
2008-03-10T00:00:00
[ [ "Rajalingham", "Kamalasen", "" ], [ "Chadwick", "David", "" ], [ "Knight", "Brian", "" ] ]
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801.1517
Fan Yizhong
Yi-Zhong Fan, Dong Xu and Da-Ming Wei
Polarization evolution accompanying the very early sharp decline of GRB X-ray afterglows
9 pages including 4 figures. Accepted for publication in MNRAS, typos corrected
Mon. Not. Roy. Astron. Soc. 387 (2008) 92-96
10.1111/j.1365-2966.2008.12886.x
null
astro-ph
null
In the synchrotron radiation model, the polarization property depends on both the configuration of the magnetic field and the geometry of the visible emitting region. Some peculiar behaviors in the X-ray afterglows of {\it Swift} gamma-ray bursts (GRBs), such as energetic flares and the plateau followed by a sharp drop, might by highly linearly-polarized because the outflows powering these behaviors may be Poynting-flux dominated. Furthermore, the broken-down of the symmetry of the visible emitting region may be hiding in current X-ray data and will give rise to interesting polarization signatures. In this work we focus on the polarization accompanying the very early sharp decline of GRB X-ray afterglows. We show that strong polarization evolution is possible in both the high latitude emission model and the dying central engine model which are used to interpret this sharp X-ray decline. It is thus not easy to efficiently probe the physical origin of the very early X-ray sharp decline with future polarimetry. Strong polarization evolution is also possible in the decline phase of X-ray flares and in the shallow decline phase of X-ray light curves characterized by chromatic X-ray VS. Optical breaks. An {\it XRT}-like detector but with polarization capability on board a {\em Swift}-like satellite would be suitable to test our predictions.
[ { "version": "v1", "created": "Thu, 10 Jan 2008 01:49:38 GMT" }, { "version": "v2", "created": "Mon, 21 Jan 2008 11:26:08 GMT" } ]
2009-11-13T00:00:00
[ [ "Fan", "Yi-Zhong", "" ], [ "Xu", "Dong", "" ], [ "Wei", "Da-Ming", "" ] ]
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801.1518
S. Karataglidis
S. Karataglidis and K. Amos
On the excluded space in applications of Feshbach projection formalism
6 pages, submitted to Physics Letters B
Phys.Lett.B660:428-431,2008
10.1016/j.physletb.2008.01.020
null
nucl-th
null
Various model applications in nuclear structure and reactions have been formulated starting with the Feshbach projection formalism. In recent studies a truncated excluded space has been enumerated to facilitate calculation and identify a convergence in expansions within that truncation. However, the effect of any remainder must be addressed before results from such can be considered physical.
[ { "version": "v1", "created": "Wed, 9 Jan 2008 22:33:09 GMT" } ]
2008-11-26T00:00:00
[ [ "Karataglidis", "S.", "" ], [ "Amos", "K.", "" ] ]
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801.1519
Tobias Stauber
N. M. R. Peres and T. Stauber
Transport in a Clean Graphene Sheet at Finite Temperature and Frequency
8 pages, 1 figure
Int. J. Mod. Phys. B 22, 2529-2536 (2008)
10.1142/S0217979208039794
null
cond-mat.mes-hall
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We calculate the conductivity of a clean graphene sheet at finite temperatures starting from the tight-binding model. We obtain a finite value for the dc-conductivity at zero temperature. For finite temperature, the spontaneous electron-hole creation, responsible for the finite conductivity at zero temperature, is washed out and the dc-conductivity yields zero. Our results are in agreement with calculations based on the field-theoretical model for graphene.
[ { "version": "v1", "created": "Thu, 10 Jan 2008 16:18:06 GMT" }, { "version": "v2", "created": "Fri, 4 Jul 2008 12:23:13 GMT" } ]
2008-07-04T00:00:00
[ [ "Peres", "N. M. R.", "" ], [ "Stauber", "T.", "" ] ]
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801.152
Oliver DeWolfe
Oliver DeWolfe, Shamit Kachru and Michael Mulligan
A Gravity Dual of Metastable Dynamical Supersymmetry Breaking
27 pages, LaTeX
Phys.Rev.D77:065011,2008
10.1103/PhysRevD.77.065011
COLO-HEP-536, SU-ITP-08/01, SLAC-PUB-13065
hep-th cond-mat.str-el
null
Metastable, supersymmetry-breaking configurations can be created in flux geometries by placing antibranes in warped throats. Via gauge/gravity duality, such configurations should have an interpretation as supersymmetry-breaking states in the dual field theory. In this paper, we perturbatively determine the asymptotic supergravity solutions corresponding to anti-D3-brane probes placed at the tip of the cascading warped deformed conifold geometry, which is dual to an SU(N+M) x SU(N) gauge theory. The backreaction of the antibranes has the effect of introducing imaginary anti-self-dual flux, squashing the compact part of the space and forcing the dilaton to run. Using the generalization of holographic renormalization to cascading geometries, we determine the expectation values of operators in the dual field theory in terms of the asymptotic values of the supergravity fields.
[ { "version": "v1", "created": "Thu, 10 Jan 2008 05:28:26 GMT" }, { "version": "v2", "created": "Tue, 12 Feb 2008 16:52:48 GMT" } ]
2016-04-28T00:00:00
[ [ "DeWolfe", "Oliver", "" ], [ "Kachru", "Shamit", "" ], [ "Mulligan", "Michael", "" ] ]
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801.1521
Sergey Yuzvinsky
S. Yuzvinsky
A new bound on the number of special fibers in a pencil of curves
null
null
null
null
math.AG
null
In the previous paper by Pereira and the author, it was proved that any pencil of plane curves of degree greater than one with irreducible generic fiber can have at most five completely reducible fibers although no examples with five such fibers were ever found. Recently Janis Stipins has proved that if any two fibers of a pencil intersect transversally then it cannot have five completely reducible fibers. In this paper we generalize the Stipins result to arbitrary pencils. We also include into consideration more general special fibers that are the unions of lines and non-reduced curves. These fibers are important for characteristic varieties of line complements.
[ { "version": "v1", "created": "Wed, 9 Jan 2008 22:40:05 GMT" }, { "version": "v2", "created": "Fri, 11 Jan 2008 19:09:33 GMT" } ]
2008-01-11T00:00:00
[ [ "Yuzvinsky", "S.", "" ] ]
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801.1522
Mazyar Mirrahimi
Karine Beauchard, Mazyar Mirrahimi
Approximate stabilization of a quantum particle in a 1D infinite square potential well
26 pages, 3 figures
null
null
null
math.AP
null
We consider a non relativistic charged particle in a 1-dimensional infinite square potential well. This quantum system is subjected to a control, which is a uniform (in space) time depending electric field. It is represented by a complex probability amplitude solution of a Schrodinger equation on a 1-dimensional bounded domain, with Dirichlet boundary conditions. We prove the almost global approximate stabilization of the eigenstates by explicit feedback laws.
[ { "version": "v1", "created": "Thu, 10 Jan 2008 16:20:20 GMT" } ]
2008-01-11T00:00:00
[ [ "Beauchard", "Karine", "" ], [ "Mirrahimi", "Mazyar", "" ] ]
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801.1523
Yong-il Shin
Yong-il Shin
Determination of the Equation of State of a Two-Component Fermi Gas at Unitarity
4 pages, 3 figures / typo correction / figure replacement
null
10.1103/PhysRevA.77.041603
null
cond-mat.stat-mech
null
We report on the measurement of the equation of state of a two-component Fermi gas of $^6$Li atoms with resonant interactions. By analyzing the \textit{in situ} density distributions of a population-imbalanced Fermi mixture reported in the recent experiment [Y. Shin \textit{et al.}, Nature \textbf{451}, 689 (2008)], we determine the energy density of a resonantly interacting Fermi gas as a function of the densities of the two components. We present a method to determine the equation of state directly from the shape of the trapped cloud, where the fully-polarized, non-interacting ideal Fermi gas in the outer region provides the absolute calibration of particle density. From the density profiles obtained at the lowest temperature, we estimate the zero-temperature equation of state.
[ { "version": "v1", "created": "Thu, 10 Jan 2008 18:58:12 GMT" }, { "version": "v2", "created": "Fri, 28 Mar 2008 14:11:24 GMT" } ]
2009-11-13T00:00:00
[ [ "Shin", "Yong-il", "" ] ]
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801.1524
Lexing Ying
Lexing Ying
Sparse Fourier Transform via Butterfly Algorithm
null
null
null
null
math.NA
null
We introduce a fast algorithm for computing sparse Fourier transforms supported on smooth curves or surfaces. This problem appear naturally in several important problems in wave scattering and reflection seismology. The main observation is that the interaction between a frequency region and a spatial region is approximately low rank if the product of their radii are bounded by the maximum frequency. Based on this property, equivalent sources located at Cartesian grids are used to speed up the computation of the interaction between these two regions. The overall structure of our algorithm follows the recently-introduced butterfly algorithm. The computation is further accelerated by exploiting the tensor-product property of the Fourier kernel in two and three dimensions. The proposed algorithm is accurate and has an $O(N \log N)$ complexity. Finally, we present numerical results in both two and three dimensions.
[ { "version": "v1", "created": "Wed, 9 Jan 2008 22:45:21 GMT" } ]
2008-01-11T00:00:00
[ [ "Ying", "Lexing", "" ] ]
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801.1525
Michael Ireland
M.J. Ireland, A. Kraus, F. Martinache, J.P. Lloyd, P.G. Tuthill
Dynamical Mass of GJ 802B: a brown dwarf in a triple system
10 pages, 6 figures, accepted for ApJ
null
10.1086/529578
null
astro-ph
null
We report a dynamical measurement of the mass of the brown dwarf GJ 802B using aperture-masking interferometry and astrometry. In addition, we report the discovery that GJ 802A is itself a close spectroscopic non-eclipsing binary with a 19 hour period. We find the mass of GJ 802B to be $0.063\pm0.005$M$_\sun$. GJ 802 has kinematics inconsistent with a young star and more consistent with the thick disk population, implying a system age of $\sim$10 GYr. However, model evolutionary tracks for GJ 802B predict system ages of $\sim$2 GYr, suggesting that brown dwarf evolutionary models may be underestimating luminosity for old brown dwarfs.
[ { "version": "v1", "created": "Wed, 9 Jan 2008 22:49:47 GMT" } ]
2009-11-13T00:00:00
[ [ "Ireland", "M. J.", "" ], [ "Kraus", "A.", "" ], [ "Martinache", "F.", "" ], [ "Lloyd", "J. P.", "" ], [ "Tuthill", "P. G.", "" ] ]
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801.1526
Dan Ciubotaru
Dan Ciubotaru
Multiplicity matrices for the affine graded Hecke algebra
30 pages
null
null
null
math.RT
null
In this paper, we look at the problem of determining the composition factors for the affine graded Hecke algebra via the computation of Kazhdan-Lusztig type polynomials. We review the algorithms of \cite{L1,L2}, and use them in particular to compute, at every real central character which admits tempered modules, the geometric parameterization, the Kazhdan-Lusztig polynomials, the composition series, and the Iwahori-Matsumoto involution for the representations with Iwahori fixed vectors of the split $p$-adic groups of type $G_2$ and $F_4$.
[ { "version": "v1", "created": "Wed, 9 Jan 2008 22:56:35 GMT" } ]
2008-01-11T00:00:00
[ [ "Ciubotaru", "Dan", "" ] ]
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801.1527
Javier Redondo
Javier Redondo
Helioscope Bounds on Hidden Sector Photons
25 pages, 8 figures; Minor comments and one figure added. Submitted to JCAP
JCAP0807:008,2008
10.1088/1475-7516/2008/07/008
DESY 07-211
hep-ph astro-ph hep-ex
null
The flux of hypothetical "hidden photons" from the Sun is computed under the assumption that they interact with normal matter only through kinetic mixing with the ordinary standard model photon. Requiring that the exotic luminosity is smaller than the standard photon luminosity provides limits for the mixing parameter down to 10^-14, depending on the hidden photon mass. Furthermore, it is pointed out that helioscopes looking for solar axions are also very sensitive to hidden photons. The recent results of the CAST collaboration are used to further constrain the mixing parameter at low masses m<1 eV where the luminosity bound is weaker. In this regime the solar hidden photon flux has a sizable contribution of longitudinally polarized hidden photons of low energy which are invisible for current helioscopes.
[ { "version": "v1", "created": "Thu, 10 Jan 2008 19:38:50 GMT" }, { "version": "v2", "created": "Tue, 22 Jan 2008 23:42:50 GMT" } ]
2008-11-26T00:00:00
[ [ "Redondo", "Javier", "" ] ]
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801.1528
Edward Glass
E.N. Glass
Acceleration and Classical Electromagnetic Radiation
To appear in Gen. Rel. Grav
Gen.Rel.Grav.40:1193-1202,2008
10.1007/s10714-007-0596-y
null
gr-qc
null
Classical radiation from an accelerated charge is reviewed along with the reciprocal topic of accelerated observers detecting radiation from a static charge. This review commemerates Bahram Mashhoon's 60th birthday.
[ { "version": "v1", "created": "Wed, 9 Jan 2008 23:08:43 GMT" } ]
2008-11-26T00:00:00
[ [ "Glass", "E. N.", "" ] ]
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801.1529
Ken Amos
K. Amos, S. Karataglidis, Y. J. Kim
Low excitation structure of $^{10}$B probed by scattering of electron and of 197 MeV polarized protons
25 pages, 18 figures
null
10.1016/j.nuclphysa.2010.01.162
null
nucl-th
null
Cross-section and analyzing power data from 197 MeV $(p,p')$ scattering and longitudinal and transverse form factors for electron scattering to low lying states in $^{10}$B have been analyzed as tests of the structure of the nuclear states when they are described using a no-core $(0+2)\hbar\omega$ shell model. While the results obtained from the shell model clearly show the need of other elements, three-body forces in particular, to explain the observed spectrum, the reasonable level of agreement obtained in the analyses of the scattering data suggest that the wavefunctions from our shell model using only a two-body potential are credible. Any changes to the wavefunctions with the introduction of three-body forces in the shell model Hamiltonian should therefore be relatively minor.
[ { "version": "v1", "created": "Wed, 9 Jan 2008 23:44:48 GMT" }, { "version": "v2", "created": "Wed, 20 Feb 2008 02:11:07 GMT" } ]
2015-05-13T00:00:00
[ [ "Amos", "K.", "" ], [ "Karataglidis", "S.", "" ], [ "Kim", "Y. J.", "" ] ]
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801.153
Xiaoguang Ma
Pavel Etingof, Rebecca Freund, Xiaoguang Ma
A Lie-theoretic construction of representations of the degenerate affine and double affine Hecke algebras of type $BC_n$
17 pages, final version. to appear in Representation Theory; mistake about the exactness of the functors are corrected.
Represent. Theory 13 (2009), 33--49.
null
null
math.RT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Let G=GL(N), K=GL(p)xGL(q), where p+q=N, and n be a positive integer. We construct a functor from the category of Harish-Chandra modules for the pair (G,K) to the category of representations of the degenerate affine Hecke algebra of type B_n, and a functor from the category of K-monodromic twisted D-modules on G/K to the category of representations of the degenerate double affine Hecke algebra of type BC_n; the second functor is an extension of the first one. These functors are generalizations of the type A functors from q-alg/9710037 and math/0702670, respectively.
[ { "version": "v1", "created": "Wed, 9 Jan 2008 23:51:50 GMT" }, { "version": "v2", "created": "Sat, 12 Jan 2008 19:24:08 GMT" }, { "version": "v3", "created": "Wed, 28 Jan 2009 14:57:10 GMT" }, { "version": "v4", "created": "Sun, 4 Apr 2010 10:22:05 GMT" } ]
2010-04-06T00:00:00
[ [ "Etingof", "Pavel", "" ], [ "Freund", "Rebecca", "" ], [ "Ma", "Xiaoguang", "" ] ]
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801.1531
Hugh Lippincott
W. H. Lippincott, K. J. Coakley, D. Gastler, A. Hime, E. Kearns, D. N. McKinsey, J. A. Nikkel, L. C. Stonehill
Scintillation time dependence and pulse shape discrimination in liquid argon
13 pages, 14 figures, Revision 3 (published)
Phys.Rev.C78:035801,2008; Erratum-ibid.C81:039901,2010
10.1103/PhysRevC.78.035801 10.1103/PhysRevC.81.039901
null
nucl-ex
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Using a single-phase liquid argon detector with a signal yield of 4.85 photoelectrons per keV of electronic-equivalent recoil energy (keVee), we measure the scintillation time dependence of both electronic and nuclear recoils in liquid argon down to 5 keVee. We develop two methods of pulse shape discrimination to distinguish between electronic and nuclear recoils. Using one of these methods, we measure a background and statistics-limited level of electronic recoil contamination to be $7.6\times10^{-7}$ between 60 and 128 keV of nuclear recoil energy (keVr) for a nuclear recoil acceptance of 50% with no nuclear recoil-like events above 72 keVr. Finally, we develop a maximum likelihood method of pulse shape discrimination using the measured scintillation time dependence and predict the sensitivity to WIMP-nucleon scattering in three configurations of a liquid argon dark matter detector.
[ { "version": "v1", "created": "Thu, 10 Jan 2008 00:18:40 GMT" }, { "version": "v2", "created": "Sat, 28 Jun 2008 19:33:27 GMT" }, { "version": "v3", "created": "Fri, 18 Jul 2008 18:49:44 GMT" }, { "version": "v4", "created": "Tue, 23 Sep 2008 19:50:26 GMT" } ]
2014-11-18T00:00:00
[ [ "Lippincott", "W. H.", "" ], [ "Coakley", "K. J.", "" ], [ "Gastler", "D.", "" ], [ "Hime", "A.", "" ], [ "Kearns", "E.", "" ], [ "McKinsey", "D. N.", "" ], [ "Nikkel", "J. A.", "" ], [ "Stonehill", "L. C.", "" ] ]
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801.1532
Romain Tessera
Romain Tessera
Left inverses of matrices with polynomial decay
24 pages
null
null
null
math.FA
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The algebra of Schur operators on l^2 is known not to be inverse-closed. When l^2=l^2(X) where X is a metric space, we can consider elements of the Schur algebra with certain decay at infinity. For instance if X has the doubling property, then Q. Sun has proved that the weighted Schur algebra for a strictly polynomial weight is inverse-closed. Here, we prove a result dealing with left-invertibility. Namely, if such an operator is bounded below in l^p for some p, then it is bounded below for all q, and it admits a left-inverse in the weighted Schur algebra.
[ { "version": "v1", "created": "Thu, 10 Jan 2008 00:33:27 GMT" }, { "version": "v2", "created": "Sat, 17 Oct 2009 08:49:06 GMT" }, { "version": "v3", "created": "Thu, 26 Nov 2009 00:36:30 GMT" }, { "version": "v4", "created": "Tue, 22 Dec 2009 01:07:41 GMT" }, { "version": "v5", "created": "Thu, 22 Jul 2010 03:41:08 GMT" } ]
2010-07-23T00:00:00
[ [ "Tessera", "Romain", "" ] ]
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801.1533
Abdelmalek Abdesselam
Abdelmalek Abdesselam, Jaydeep Chipalkatti
The Higher Transvectants are Redundant
LaTeX, 38 pages
null
null
null
math.AG math.RT
null
Let A, B denote generic binary forms, and let u_r = (A,B)_r denote their r-th transvectant in the sense of classical invariant theory. In this paper we classify all the quadratic syzygies between the u_r. As a consequence, we show that each of the higher transvectants u_r, r>1, is redundant in the sense that it can be completely recovered from u_0 and u_1. This result can be geometrically interpreted in terms of the incomplete Segre imbedding. The calculations rely upon the Cauchy exact sequence of SL_2-representations, and the notion of a 9-j symbol from the quantum theory of angular momentum. We give explicit computational examples for SL_3, g_2 and S_5 to show that this result has possible analogues for other categories of representations.
[ { "version": "v1", "created": "Thu, 10 Jan 2008 00:25:11 GMT" } ]
2008-01-11T00:00:00
[ [ "Abdesselam", "Abdelmalek", "" ], [ "Chipalkatti", "Jaydeep", "" ] ]
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801.1534
Huitzu Tu
Jonathan L. Feng, Arvind Rajaraman and Huitzu Tu
Unparticle Self-Interactions and Their Collider Implications
12 pages, 5 figures; v2: published version
Phys.Rev.D77:075007,2008
10.1103/PhysRevD.77.075007
UCI-TR-2007-50
hep-ph hep-ex hep-th
null
In unparticle physics, operators of the conformal sector have self-interactions, and these are unsuppressed for strong coupling. The 3-point interactions are completely determined by conformal symmetry, up to a constant. We do not know of any theoretical upper bounds on this constant. Imposing current experimental constraints, we find that these interactions mediate spectacular collider signals, such as $pp -> U -> UU -> \gamma \gamma \gamma \gamma$, $\gamma \gamma ZZ$, $ZZZZ$, $\gamma \gamma l^+ l^-$, $ZZ l^+ l^-$, and $4l$, with cross sections of picobarns or larger at the Large Hadron Collider. Self-interactions may therefore provide the leading discovery prospects for unparticle physics.
[ { "version": "v1", "created": "Thu, 10 Jan 2008 18:40:58 GMT" }, { "version": "v2", "created": "Sun, 16 Mar 2008 07:25:13 GMT" } ]
2008-11-26T00:00:00
[ [ "Feng", "Jonathan L.", "" ], [ "Rajaraman", "Arvind", "" ], [ "Tu", "Huitzu", "" ] ]
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801.1535
Adrian Paul Flitney
Adrian P. Flitney
Comments on "Reverse auction: the lowest positive integer game"
4 pages
Fluct. Noise Lett. 8 (2008) C1-C4
null
null
math.CO math.HO math.PR
null
In Zeng et al. [Fluct. Noise Lett. 7 (2007) L439--L447] the analysis of the lowest unique positive integer game is simplified by some reasonable assumptions that make the problem tractable for arbitrary numbers of players. However, here we show that the solution obtained for rational players is not a Nash equilibrium and that a rational utility maximizer with full computational capability would arrive at a solution with a superior expected payoff. An exact solution is presented for the three- and four-player cases and an approximate solution for an arbitrary number of players.
[ { "version": "v1", "created": "Thu, 10 Jan 2008 01:39:02 GMT" } ]
2009-12-09T00:00:00
[ [ "Flitney", "Adrian P.", "" ] ]
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801.1536
Shuang Zhang
Shuang Zhang, Dentcho A Genov, Yuan Wang, Ming Liu and Xiang Zhang
Plasmonic Metamaterial With Coupling Induced Transparency
14 pages, 4 figures
null
null
null
physics.optics
null
A plasmonic "molecule" consisting of a radiative element coupled with a sub-radiant (dark) element is theoretically investigated. The plasmonic "molecule" shows close resemblance to the electromagnetically induced transparency (EIT) in an atomic system. Because of its sub-wavelength dimension, this EIT-like "molecule" can be used as building block to construct a "slow light" plasmonic metamaterial.
[ { "version": "v1", "created": "Thu, 10 Jan 2008 01:59:53 GMT" } ]
2008-01-11T00:00:00
[ [ "Zhang", "Shuang", "" ], [ "Genov", "Dentcho A", "" ], [ "Wang", "Yuan", "" ], [ "Liu", "Ming", "" ], [ "Zhang", "Xiang", "" ] ]
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801.1537
Tatsuya Honma
T. Honma and P. H. Hor
Unified electronic phase diagram for hole-doped high-Tc cuprates
17 pages, 8 figures, and 10 tables. Accepted for the publication of the Physical review B
Phys.Rev.B77:184520,2008
10.1103/PhysRevB.77.184520
null
cond-mat.supr-con astro-ph cond-mat.mtrl-sci cond-mat.str-el
null
We have analyzed various characteristic temperatures and energies of hole-doped high-Tc cuprates as a function of a dimensionless hole-doping concentration (pu). Entirely based on the experimental grounds we construct a unified electronic phase diagram (UEPD), where three characteristic temperatures (T*'s) and their corresponding energies (E*'s) converge as pu increases in the underdoped regime. T*'s and E*'s merge together with the Tc curve and 3.5kBTc curve at pu - 1.1 in the overdoped regime, respectively. They finally go to zero at pu - 1.3. The UEPD follows an asymmetric half-dome-shaped Tc curve in which Tc appears at pu - 0.4, reaches a maximum at pu - 1, and rapidly goes to zero at pu - 1.3. The asymmetric half-dome-shaped Tc curve is at odds with the well-known symmetric superconducting dome for La2-xSrxCuO4 (SrD-La214), in which two characteristic temperatures and energies converge as pu increases and merge together at pu - 1.6, where Tc goes to zero. The UEPD clearly shows that pseudogap phase precedes and coexists with high temperature superconductivity in the underdoped and overdoped regimes, respectively. It is also clearly seen that the upper limit of high-Tc cuprate physics ends at a hole concentration that equals to 1.3 times the optimal doping concentration for almost all high-Tc cuprate materials, and 1.6 times the optimal doping concentration for the SrD-La214. Our analysis strongly suggests that pseudogap is a precursor of high-Tc superconductivity, the observed quantum critical point inside the superconducting dome may be related to the end point of UEPD, and the normal state of the underdoped and overdoped high temperature superconductors cannot be regarded as a conventional Fermi liquid phase.
[ { "version": "v1", "created": "Thu, 10 Jan 2008 02:14:13 GMT" }, { "version": "v2", "created": "Tue, 13 May 2008 01:12:56 GMT" } ]
2009-11-13T00:00:00
[ [ "Honma", "T.", "" ], [ "Hor", "P. H.", "" ] ]
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801.1538
Tim Austin
Tim D. Austin (UC, Los Angeles)
Razborov flag algebras as algebras of measurable functions
12 pages
null
null
null
math.CO
null
These are some brief notes on the translation from Razborov's recently-developed notion of flag algebra into the lexicon of functions and measures on certain abstract Cantor spaces (totally disconnected compact metric spaces).
[ { "version": "v1", "created": "Thu, 10 Jan 2008 02:18:35 GMT" } ]
2008-01-11T00:00:00
[ [ "Austin", "Tim D.", "", "UC, Los Angeles" ] ]
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801.1539
Qing-Hong Cao
Qing-Hong Cao
Demonstration of One Cutoff Phase Space Slicing Method: Next-to-Leading Order QCD Corrections to the $tW$ Associated Production in Hadron Collision
null
null
null
null
hep-ph
null
We present a detailed calculation of next-to-leading order QCD corrections to the $tW$ associated production using the one cutoff phase space slicing method. Such QCD corrections have been calculated independently by two groups already, however, a number of differences were found. It is desirable to have a third party calculation to make a crossing check. In this note, we present our complete results of the virtual corrections which are not shown in the literature so far. The numerical comparison will be presented in the forthcoming paper. As a demonstration of the one cutoff phase space slicing method, we also show in details how to organize the color ordered amplitudes and how to slice the soft and collinear phase space regions.
[ { "version": "v1", "created": "Thu, 10 Jan 2008 10:01:55 GMT" } ]
2008-01-11T00:00:00
[ [ "Cao", "Qing-Hong", "" ] ]
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801.154
Anna Yuen Lam Wong
J. J. Jia, Y. F. Huang and K. S. Cheng
A Morphological Approach to the Pulsed Emission from Soft Gamma Repeaters
7 figures, accepted by ApJ
null
10.1086/529425
null
astro-ph
null
We present a geometrical methodology to interpret the periodical light curves of Soft Gamma Repeaters based on the magnetar model and the numerical arithmetic of the three-dimensional magnetosphere model for the young pulsars. The hot plasma released by the star quake is trapped in the magnetosphere and photons are emitted tangent to the local magnetic field lines. The variety of radiation morphologies in the burst tails and the persistent stages could be well explained by the trapped fireballs on different sites inside the closed field lines. Furthermore, our numerical results suggests that the pulse profile evolution of SGR 1806-20 during the 27 December 2004 giant flare is due to a lateral drift of the emitting region in the magnetosphere.
[ { "version": "v1", "created": "Thu, 10 Jan 2008 04:33:21 GMT" } ]
2009-11-13T00:00:00
[ [ "Jia", "J. J.", "" ], [ "Huang", "Y. F.", "" ], [ "Cheng", "K. S.", "" ] ]
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801.1541
Karl Schwede
S\'andor J. Kov\'acs, Karl E. Schwede, Karen E. Smith
The canonical sheaf of Du Bois singularities
Minor changes, 21 pages, to appear in Advances in Mathematics
Advances in Mathematics, Volume 224, Issue 4, Pages 1618-1640, 2010
10.1016/j.aim.2010.01.020
null
math.AG math.AC
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We prove that a Cohen-Macaulay normal variety $X$ has Du Bois singularities if and only if $\pi_*\omega_{X'}(G) \simeq \omega_X$ for a log resolution $\pi: X' \to X$, where $G$ is the reduced exceptional divisor of $\pi$. Many basic theorems about Du Bois singularities become transparent using this characterization (including the fact that Cohen-Macaulay log canonical singularities are Du Bois). We also give a straightforward and self-contained proof that (generalizations of) semi-log-canonical singularities are Du Bois, in the Cohen-Macaulay case. It also follows that the Kodaira vanishing theorem holds for semi-log-canonical varieties and that Cohen-Macaulay semi-log-canonical singularities are cohomologically insignificant in the sense of Dolgachev.
[ { "version": "v1", "created": "Thu, 10 Jan 2008 02:50:00 GMT" }, { "version": "v2", "created": "Mon, 27 Apr 2009 22:06:58 GMT" }, { "version": "v3", "created": "Sat, 30 Jan 2010 17:22:59 GMT" } ]
2010-05-25T00:00:00
[ [ "Kovács", "Sándor J.", "" ], [ "Schwede", "Karl E.", "" ], [ "Smith", "Karen E.", "" ] ]
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801.1542
Robert Schabinger
Robert M. Schabinger (University of Washington, Seattle)
Scattering on the Moduli Space of N=4 Super Yang-Mills
21 pages, 5 figures; in v2: fixed eq. (A.2); in v3: trivial typos corrected in text
null
null
null
hep-th hep-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We calculate one-loop scattering amplitudes in N=4 super Yang-Mills theory away from the origin of the moduli space and demonstrate that the results are extremely simple, in much the same way as in the conformally invariant theory. Specifically, we consider the model where an SU(2) gauge group is spontaneously broken down to U(1). The complete component Lagrange density of the model is given in a form useful for perturbative calculations. We argue that the scattering amplitudes with massive external states deserve further study. Finally, our work shows that loop corrections can be readily computed in a mass-regulated N=4 theory, which may be relevant in trying to connect weak-coupling results with those at strong coupling, as discussed recently by Alday and Maldacena.
[ { "version": "v1", "created": "Thu, 10 Jan 2008 03:08:46 GMT" }, { "version": "v2", "created": "Sat, 10 Jan 2015 12:42:25 GMT" }, { "version": "v3", "created": "Fri, 20 Feb 2015 16:11:05 GMT" } ]
2015-02-23T00:00:00
[ [ "Schabinger", "Robert M.", "", "University of Washington, Seattle" ] ]
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801.1543
V. Ryzhii
V. Ryzhii, M. Ryzhii, A. Satou, T. Otsuji
Current-voltage characteristics of a graphene nanoribbon field-effect transistor
8 pages, 8 figures
null
10.1143/APEX.1.013001
null
cond-mat.mes-hall
null
We present an analytical device model for a field-effect transistor based on a heterostructure which consists of an array of nanoribbons clad between the highly conducting substrate (the back gate) and the top gate controlling the source-drain current. The equations of the model of a graphene nanoribbon field-effect transistor (GNR-FET) include the Poisson equation in the weak nonlocality approximation. Using this model, we find explicit analytical formulas for the spatial distributions of the electric potential along the channel and for the GNR-FET current-voltage characteristics (the dependences of the source-drain current on the drain voltages as well as on the back gate and top gate voltages) for different geometric parameters of the device. It is shown that the shortening of the top gate can result in a substantial modification of the GNR-FET current-voltage characteristics.
[ { "version": "v1", "created": "Thu, 10 Jan 2008 03:01:30 GMT" } ]
2015-05-13T00:00:00
[ [ "Ryzhii", "V.", "" ], [ "Ryzhii", "M.", "" ], [ "Satou", "A.", "" ], [ "Otsuji", "T.", "" ] ]
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801.1544
Avinatan Hassidim
Michael Ben-Or, Claude Cr\'epeau, Daniel Gottesman, Avinatan Hassidim, Adam Smith
Secure Multiparty Quantum Computation with (Only) a Strict Honest Majority
10 pages, preliminary version in FOCS'06
Proc. 47th Annual IEEE Symposium on the Foundations of Computer Science (FOCS '06), pp. 249-260. IEEE Press, 2006
10.1109/FOCS.2006.68
null
quant-ph
null
Secret sharing and multiparty computation (also called "secure function evaluation") are fundamental primitives in modern cryptography, allowing a group of mutually distrustful players to perform correct, distributed computations under the sole assumption that some number of them will follow the protocol honestly. This paper investigates how much trust is necessary -- that is, how many players must remain honest -- in order for distributed quantum computations to be possible. We present a verifiable quantum secret sharing (VQSS) protocol, and a general secure multiparty quantum computation (MPQC) protocol, which can tolerate any (n-1)/2 (rounded down) cheaters among n players. Previous protocols for these tasks tolerated (n-1)/4 (rounded down) and (n-1)/6 (rounded down) cheaters, respectively. The threshold we achieve is tight - even in the classical case, ``fair'' multiparty computation is not possible if any set of n/2 players can cheat. Our protocols rely on approximate quantum error-correcting codes, which can tolerate a larger fraction of errors than traditional, exact codes. We introduce new families of authentication schemes and approximate codes tailored to the needs of our protocols, as well as new state purification techniques along the lines of those used in fault-tolerant quantum circuits.
[ { "version": "v1", "created": "Thu, 10 Jan 2008 03:07:00 GMT" } ]
2016-11-17T00:00:00
[ [ "Ben-Or", "Michael", "" ], [ "Crépeau", "Claude", "" ], [ "Gottesman", "Daniel", "" ], [ "Hassidim", "Avinatan", "" ], [ "Smith", "Adam", "" ] ]
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801.1545
V. Ravishankar
Shanthanu Bhardwaj and V. Ravishankar
Characteristics and benchmarks of entanglement of mixed states -- the two qubit case
12 pages, 6 figures. Enlarged version of quant-phy/0703017
null
10.1103/PhysRevA.77.022322
null
quant-ph
null
We propose that the entanglement of mixed states is characterised properly in terms of a probability density function $\mathcal{P}_{\rho}(\mathcal{E})$. There is a need for such a measure since the prevalent measures (such as \textit{concurrence} and \textit{negativity}) for two qubit systems are rough benchmarks, and not monotones of each other. Focussing on the two qubit states, we provide an explicit construction of $\mathcal{P}_{\rho}(\mathcal{E})$ and show that it is characterised by a set of parameters, of which concurrence is but one particular combination. $\mathcal{P}_{\rho}(\mathcal{E})$ is manifestly invariant under $SU(2) \times SU(2)$ transformations. It can, in fact, reconstruct the state up to local operations - with the specification of at most four additional parameters. Finally the new measure resolves the controversy regarding the role of entanglement in quantum computation in NMR systems.
[ { "version": "v1", "created": "Thu, 10 Jan 2008 05:05:58 GMT" } ]
2009-11-13T00:00:00
[ [ "Bhardwaj", "Shanthanu", "" ], [ "Ravishankar", "V.", "" ] ]
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801.1546
Aseem Paranjape
Aseem Paranjape, T. P. Singh
Structure Formation, Backreaction and Weak Gravitational Fields
20 pages, 14 figures; v3 -- Added material, scale dependence of backreaction highlighted; 2 figures and 1 reference added; conclusions unchanged; version accepted for publication in JCAP
JCAP 0803:023,2008
10.1088/1475-7516/2008/03/023
null
astro-ph gr-qc hep-th
null
There is an ongoing debate in the literature as to whether the effects of averaging out inhomogeneities (``backreaction'') in Cosmology can be large enough to account for the acceleration of the scale factor in the FLRW models. In particular, some simple models of structure formation studied in the literature seem to indicate that this is indeed possible, and it has also been suggested that the perturbed FLRW framework is no longer a good approximation during structure formation, when the density contrast becomes nonlinear. In this work we attempt to clarify the situation to some extent, using a fully relativistic model of pressureless spherical collapse. We find that whereas averaging during structure formation can lead to acceleration via a selective choice of averaging domains, the acceleration is not present when more generic domains are used for averaging. Further, we show that for most of the duration of the collapse, matter velocities remain small, and the perturbed FLRW form of the metric can be explicitly recovered, in the structure formation phase. We also discuss the fact that the magnitude of the average effects of inhomogeneities depends on the scale of averaging, and while it may not be completely negligible on intermediate scales, it is expected to remain small when averaging on suitably large scales.
[ { "version": "v1", "created": "Thu, 10 Jan 2008 06:08:12 GMT" }, { "version": "v2", "created": "Wed, 16 Jan 2008 11:13:34 GMT" }, { "version": "v3", "created": "Sun, 2 Mar 2008 05:22:14 GMT" } ]
2009-06-23T00:00:00
[ [ "Paranjape", "Aseem", "" ], [ "Singh", "T. P.", "" ] ]
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801.1547
Theodore A. Jacobson
Ted Jacobson
Einstein-aether gravity: a status report
18 pages, for the proceedings of the conference "From Quantum to Emergent Gravity: Theory and Phenomenology", June 11-15 2007, SISSA; Trieste, Italy; v.2: added brief comments on observability of wave speeds and polarizations, and how neutron star and black hole "sensitivities" might be computed
PoSQG-Ph:020,2007
null
null
gr-qc astro-ph hep-ph hep-th
null
This paper reviews the theory, phenomenology, and observational constraints on the coupling parameters of Einstein-aether gravity, i.e. General Relativity coupled to a dynamical unit timelike vector field. A discussion of open questions concerning both phenomenology and fundamental issues is included.
[ { "version": "v1", "created": "Thu, 10 Jan 2008 06:51:29 GMT" }, { "version": "v2", "created": "Sun, 9 Mar 2008 16:26:11 GMT" } ]
2008-11-26T00:00:00
[ [ "Jacobson", "Ted", "" ] ]
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801.1548
Alister W. Graham
Alister W. Graham
Fundamental Planes, and the "barless" M-sigma relation, for supermassive black holes
16 pages. Originally submitted to ApJ on September 10, 2007
2008, ApJ, 680, 143
10.1086/587473
null
astro-ph
null
The residuals about the standard M-sigma relation correlate with the effective radius, absolute magnitude, and Sersic index of the host bulge - although, it is noted here that the elliptical galaxies do not partake in such correlations. Moreover, it is revealed that barred galaxies (with their relatively small, faint, and low stellar concentration bulges) can deviate from the M-sigma relation by delta(log M) = -0.5 to -1.0 dex (in the sense that their sigma values are too large) and generate much of the aforementioned correlations. Removal of the seven barred galaxies from the Tremaine et al. set of 31 galaxies results in a ``barless M-sigma'' relation with an intrinsic scatter of 0.17 dex (cf. 0.27 dex for the 31 galaxies) and a total scatter of 0.25 dex (cf. 0.34 dex for the 31 galaxies). The introduction of third parameters does not reduce the scatter of the barless M-sigma relation. Furthermore, removal of the barred galaxies, or all the disk galaxies, from an expanded and updated set of 40 galaxies with reliable black hole mass measurements gives a consistent result, such that log(M_bh/M_sun) = (8.25+/-0.05) + (3.68+/-0.25)log [sigma/200]. The "barless" sigma-L relation for galaxies with black hole mass measurements is found to be consistent with that from the SDSS sample of early-type galaxies. In addition, the barless M-sigma relation, the M-L relation, and the M-n relation are all shown to yield SMBH masses less than 2-4 x 10^9 M_sun.
[ { "version": "v1", "created": "Thu, 10 Jan 2008 07:03:21 GMT" }, { "version": "v2", "created": "Fri, 1 Feb 2008 05:54:29 GMT" } ]
2012-04-26T00:00:00
[ [ "Graham", "Alister W.", "" ] ]
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801.1549
S Habib Mazharimousavi
S. Habib Mazharimousavi
Non-Hermitian Hamiltonian versus E=0 localized states
12 pages, 10 figures
Journal of Physics A: Math. Theor. 41 (2008) 244016 (13pp)
10.1088/1751-8113/41/24/244016
null
quant-ph
null
We analyze the zero energy solutions, of a two dimensional system which undergoes a non-radial symmetric, complex potential V(r,$\phi$). By virtue of the coherent states concept, the localized states are constructed, and the consequences of the imaginary part of the potential are found both analytically and schematically.
[ { "version": "v1", "created": "Thu, 10 Jan 2008 07:38:36 GMT" } ]
2009-11-13T00:00:00
[ [ "Mazharimousavi", "S. Habib", "" ] ]
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801.155
Alexei Moiseev
A. V. Moiseev (Special Astrophysical Observatory, Russia)
3D spectroscopy of the ionized gas kinematics in galactic rings
2 pages, 1 figure; to appear in "Formation and Evolution of Galaxy Disks", ASP Conf. Ser., eds. J.G. Funes & E.M. Corsini
null
null
null
astro-ph
null
The kinematics of galactic rings were studied with a scanning Fabry-Perot interferometer mounted in the multi-mode focal reducer SCORPIO (Afanasiev & Moiseev 2005) at the SAO RAS 6-m telescope. The analysis of the ionized gas velocity fields allows us to understand the nature of the ring formation in several galaxies. The different types of the rings in the presented objects (resonanced, collisional, polar) were caused by the various sorts of interactions: merging, head-on collisions.
[ { "version": "v1", "created": "Thu, 10 Jan 2008 07:55:31 GMT" } ]
2008-01-11T00:00:00
[ [ "Moiseev", "A. V.", "", "Special Astrophysical Observatory, Russia" ] ]
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801.1551
Alexei Moiseev
A. A. Smirnova, A. V. Moiseev (Special Astrophysical Observatory, Russia)
Merging as a key to reforming of disk and AGN triggering in Sy galaxy Mrk334
2 pages, 1 figure; to appear in "Formation and Evolution of Galaxy Disks", ASP Conf. Ser., eds. J.G. Funes & E.M. Corsini
null
null
null
astro-ph
null
We have studied the kinematics of the ionized gas and stellar component in Mrk334 using methods of panoramic (3D) spectroscopy. The observations were performed at the prime focus of the SAO RAS 6-m telescope with the integral-field spectrograph MPFS (Afanasiev et al. 2001) and with a scanning Fabry-Perot interferometer (FPI), installed on the multimode device SCORPIO (Afanasiev & Moiseev 2005). Based on these data, the monochromatic maps and velocity fields in different emission lines of the ionized gas were constructed. The diagnostic diagrams have been made based on the emission lines ratios.
[ { "version": "v1", "created": "Thu, 10 Jan 2008 08:00:57 GMT" } ]
2008-01-11T00:00:00
[ [ "Smirnova", "A. A.", "", "Special Astrophysical Observatory,\n Russia" ], [ "Moiseev", "A. V.", "", "Special Astrophysical Observatory,\n Russia" ] ]
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801.1552
Takehito Yokoyama
Takehito Yokoyama
Controllable spin transport in ferromagnetic graphene junctions
4 pages, 4 figures, accepted for publication in Phys. Rev. B
Phys. Rev. B 77, 073413 (2008)
10.1103/PhysRevB.77.073413
null
cond-mat.mes-hall
null
We study spin transport in normal/ferromagnetic/normal graphene junctions where a gate electrode is attached to the ferromagnetic graphene. We find that due to the exchange field of the ferromagnetic graphene, spin current through the junctions has an oscillatory behavior with respect to the chemical potential in the ferromagnetic graphene, which can be tuned by the gate voltage. Especially, we obtain a controllable spin current reversal by the gate voltage. Our prediction of high controllability of spin transport in ferromagnetic graphene junction may contribute to the development of the spintronics.
[ { "version": "v1", "created": "Thu, 10 Jan 2008 08:02:40 GMT" }, { "version": "v2", "created": "Mon, 14 Jan 2008 07:26:59 GMT" } ]
2009-11-13T00:00:00
[ [ "Yokoyama", "Takehito", "" ] ]
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801.1553
Ephim Golbraikh
O.G. Chkhetiani, E. Golbraikh
Helicity Spectra and Dissipation
null
null
10.1016/j.physleta.2008.06.079
null
physics.flu-dyn physics.geo-ph
null
Both dissipation of helicity and it spectrum we are study on the basis of asymptotic model. Introduction into model dependence of angle between turbulent components vorticity and velocity on the governing parameters leads to the spectra of helicity observed experimentally and obtained by DNS model computations by various authors. At the same time, it settles the problem of helicity dissipation divergence with growing Reynolds number.
[ { "version": "v1", "created": "Thu, 10 Jan 2008 08:03:49 GMT" }, { "version": "v2", "created": "Sun, 13 Jan 2008 07:28:03 GMT" } ]
2009-11-13T00:00:00
[ [ "Chkhetiani", "O. G.", "" ], [ "Golbraikh", "E.", "" ] ]
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801.1554
S Habib Mazharimousavi
S. Habib Mazharimousavi and M. Halilsoy
Einstein-Yang-Mills black hole solution in higher dimensions by the Wu-Yang Ansatz
10 pages, 5 figures
Phys.Lett.B659:471,2008
10.1016/j.physletb.2007.11.006
null
gr-qc
null
By employing the higher dimensional version of the Wu-Yang Ansatz we obtain black hole solutions in the spherically symmetric Einstein-Yang-Mills (EYM) theory. Although these solutions were found recently by other means, our method provides an alternative way in which one identifies the contribution from the Yang-Mills (YM) charge. Our method has the advantage to be carried out analytically as well. We discuss some interesting features of the black hole solutions obtained.
[ { "version": "v1", "created": "Thu, 10 Jan 2008 08:05:44 GMT" }, { "version": "v2", "created": "Fri, 11 Jan 2008 14:12:08 GMT" } ]
2008-11-26T00:00:00
[ [ "Mazharimousavi", "S. Habib", "" ], [ "Halilsoy", "M.", "" ] ]
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801.1555
Raphael Gavazzi
Raphael Gavazzi (UCSB), Tommaso Treu (UCSB), Leon V.E. Koopmans (Kapteyn Astronomical Institute), Adam S. Bolton (IfA, CFA), Leonidas A. Moustakas (JPL), Scott Burles (MIT), Philip J. Marshall (UCSB)
The Sloan Lens ACS Survey. VI: Discovery and analysis of a double Einstein ring
null
null
10.1086/529541
null
astro-ph
null
We report the discovery of two concentric Einstein rings around the gravitational lens SDSSJ0946+1006, as part of the Sloan Lens ACS Survey. The main lens is at redshift zl=0.222, while the inner ring (1) is at zs1=0.609 and Einstein radius $Re_1=1.43\pm0.01"$. The wider image separation ($Re_2=2.07\pm 0.02"$) of the outer ring (2) implies that it is at higher redshift. Its detection in the F814W filter implies zs2<6.9. The configuration can be well described by a total density profile $\rho_{tot} ~ r^-g'$ with $g'=2.00\pm0.03$ and velocity dispersion $\sigma_{SIE}=287\pm5\kms$. [...] We consider whether this configuration can be used to constrain cosmological parameters exploiting angular distance ratios entering the lens equations. Constraints for SDSSJ0946+1006, are uninteresting due to the sub-optimal lens and source redshifts. We then consider the perturbing effect of the mass associated with Ring 1 building a double lens plane compound lens model. This introduces minor changes to the mass of the main lens and allows to estimate the mass of Ring 1 $(\sigma_{SIE,s1}=94\pm30\kms)$. We examine the prospects of doing cosmography with a sample of 50 double lenses, expected from future space based surveys such as DUNE or JDEM. Taking full account of the model uncertainties, such a sample could be used to measure $\Omega_m$ and $w$ with 10% accuracy, for a flat cosmology.
[ { "version": "v1", "created": "Thu, 10 Jan 2008 08:06:16 GMT" } ]
2009-11-13T00:00:00
[ [ "Gavazzi", "Raphael", "", "UCSB" ], [ "Treu", "Tommaso", "", "UCSB" ], [ "Koopmans", "Leon V. E.", "", "Kapteyn Astronomical Institute" ], [ "Bolton", "Adam S.", "", "IfA, CFA" ], [ "Moustakas", "Leonidas A.", "", "JPL" ], [ "Burles", "Scott", "", "MIT" ], [ "Marshall", "Philip J.", "", "UCSB" ] ]
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801.1556
Cedric Bonnafe
C\'edric Bonnaf\'e (LM-Besan\c{c}on), Rapha\"el Rouquier (MI)
Compactification des vari\'et\'es de Deligne-Lusztig
14 pages. Minor corrections
null
null
null
math.AG math.GR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We construct explicitly the normalisation of the Bott-Samelson-Demazure-Hansen compactification of Deligne-Lusztig varieties $X(w)$ in their covering $Y(w)$: we retrieve a result by Deligne-Lusztig about the local monodromy around the divisors of the compactification.
[ { "version": "v1", "created": "Thu, 10 Jan 2008 17:03:27 GMT" }, { "version": "v2", "created": "Thu, 4 Sep 2008 13:12:29 GMT" } ]
2008-09-04T00:00:00
[ [ "Bonnafé", "Cédric", "", "LM-Besançon" ], [ "Rouquier", "Raphaël", "", "MI" ] ]
[ 0.0805147514, -0.0350794271, -0.0327470191, 0.0074578766, -0.0074287215, -0.0580303296, 0.0093471278, -0.040443968, -0.0626018494, -0.0058164443, -0.0500068441, -0.0164668057, -0.0962818339, -0.0182627607, 0.0220762491, 0.1085036546, 0.0328403153, 0.0987075344, 0.0702521503, 0.0817276016, 0.039161142, -0.0492138229, 0.0593831241, -0.0133880256, 0.038648013, -0.0212365817, 0.0038018262, 0.0024504869, 0.096841611, -0.0364089012, 0.0270559415, -0.0521060117, 0.0639546439, -0.0253766067, -0.1589769721, 0.0955354571, 0.0276856907, 0.0857393444, -0.0121401874, 0.1246439219, -0.0575638451, 0.1042120233, -0.1125153974, -0.0003536879, 0.1544054598, 0.1282824725, 0.0661937594, 0.024350347, -0.0806546956, 0.075849928, -0.0364322253, 0.0846197903, 0.0613423474, -0.0868588984, -0.0546716601, -0.0246535596, -0.0155338421, 0.0416568182, 0.0669401288, -0.065960519, 0.0137029011, -0.0594764203, -0.0244902913, 0.0367587619, 0.00890397, 0.0585434586, -0.110369578, 0.0352426954, 0.0754767433, 0.0607825704, -0.1533792019, 0.0492138229, 0.0027055941, 0.0722113699, 0.0696457252, 0.020770099, -0.0173064731, 0.110369578, 0.0259363838, 0.0045802677, 0.015475532, -0.0816343054, -0.0141693829, 0.0088456599, 0.0341231376, -0.0434294492, 0.0147408228, 0.1508601904, -0.0452720523, 0.0813544169, 0.0887714773, 0.0378783159, -0.0072537912, 0.0402806997, 0.0639546439, 0.0052770749, 0.0227526464, 0.047441192, 0.0223094895, 0.0141110728, 0.031440869, 0.025539875, 0.1614959836, -0.1355595887, 0.1811815053, 0.0769228414, 0.0076153143, -0.0208633952, -0.0948823839, -0.0283154417, 0.0056764996, -0.0075161872, 0.013679577, 0.0946491435, 0.0938561261, -0.0512196943, -0.0252133384, -0.0118078189, -0.0561644025, 0.0403506719, 0.033773277, -0.0941360146, -0.0179245602, -0.0708585754, 0.0462749898, -0.0571440123, 0.0111022657, -0.0891913101, -0.0286653023, -0.0891913101, 0.087745212, -0.0481875651, 0.0598029606, -0.0630216822, -0.0401407517, -0.0414935499, -0.0080992896, -0.0441058502, 0.0510797501, 0.0192773584, 0.0329102874, 0.054625012, 0.1027192771, 0.0624619052, 0.0076852865, 0.0458085053, -0.0816809535, 0.0500534922, -0.0740773007, 0.0566308834, -0.0092538316, -0.0393244103, 0.0729577467, -0.0173997693, -0.0803748071, -0.1413439661, 0.0375984274, 0.1007600576, 0.0995471999, -0.0387879573, 0.0845731422, 0.057004068, -0.0911038816, -0.0292717293, 0.0648876131, -0.0021691401, -0.0319306739, 0.0106007978, -0.057517197, -0.071744889, -0.0096328482, 0.0455519408, -0.0399075113, -0.0379016399, -0.0408871248, 0.0334467404, -0.0911505297, -0.1813680977, -0.0572839566, -0.0097436374, 0.0059388955, 0.0311843045, -0.0412603095, -0.045132108, -0.018962482, -0.0348928347, 0.0684795156, -0.0052158488, 0.1127952859, -0.0317440815, -0.103745535, 0.0142976651, 0.0767828971, 0.0992673114, 0.0424731635, -0.0836401731, 0.0371552706, 0.0733309314, -0.0214464981, -0.0532722138, -0.0486073978, 0.0109215034, 0.015976999, 0.0387179852, -0.0149390781, 0.0434994213, 0.0511730462, 0.1264165491, -0.003863052, -0.0132364193, -0.0859725848, 0.0714650005, 0.0416334942, 0.0632082745, -0.0244203191, 0.1159673631, -0.0680130348, -0.0696457252, -0.0243036989, 0.0591032356, 0.0029213419, -0.0371785946, 0.0840133578, -0.0066415337, 0.0269159954, 0.0710918158, -0.0018498916, -0.0584968105, -0.0378083438, -0.0209450293, 0.1078505814, 0.0010532283, -0.119512625, -0.0199420936, -0.033236824, 0.0224610958, -0.0359890647, 0.0069039296, -0.0638613477, -0.0547649562, 0.0064782649, 0.0144725963, 0.0041021239, 0.0286886264, -0.0115862405, 0.0713717043, -0.0158020686, 0.0191840623, -0.0177029818, -0.0196272191, -0.0188691858, 0.0455985889, 0.0520127155, -0.0247935038, -0.1048650965, 0.0021020833 ]
801.1557
Olivier Ronsin
Tristan Baumberger (INSP), Christiane Caroli (INSP), David Martina (INSP), Olivier Ronsin (INSP)
Magic angles and cross-hatching instability in hydrogel fracture
null
null
10.1103/PhysRevLett.100.178303
null
cond-mat.soft
null
The full 2D analysis of roughness profiles of fracture surfaces resulting from quasi-static crack propagation in gelatin gels reveals an original behavior characterized by (i) strong anisotropy with maximum roughness at $V$-independent symmetry-preserving angles, (ii) a sub-critical instability leading, below a critical velocity, to a cross-hatched regime due to straight macrosteps drifting at the same magic angles and nucleated on crack-pinning network inhomogeneities. Step height values are determined by the width of the strain-hardened zone, governed by the elastic crack blunting characteristic of soft solids with breaking stresses much larger that low strain moduli.
[ { "version": "v1", "created": "Thu, 10 Jan 2008 08:14:05 GMT" }, { "version": "v2", "created": "Fri, 29 Feb 2008 08:56:57 GMT" } ]
2009-11-13T00:00:00
[ [ "Baumberger", "Tristan", "", "INSP" ], [ "Caroli", "Christiane", "", "INSP" ], [ "Martina", "David", "", "INSP" ], [ "Ronsin", "Olivier", "", "INSP" ] ]
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801.1558
BoMee Lee
Jounghun Lee, Bomee Lee (Seoul Nat'l Univ.)
The Variation of Galaxy Morphological Type with the Shear of Environment
ApJ in press, accepted version, analysis improved, new discussion added
Astrophys.J. 688 (2008) 78
10.1086/592181
null
astro-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Recent N-body simulations have shown that the assembly history of galactic halos depend on the density of large-scale environment. It implies that the galaxy properties like age and size of bulge may also vary with the surrounding large-scale structures, which are characterized by the tidal shear as well as the density. By using a sample of 15,882 well-resolved nearby galaxies from the Tully Catalog and the real space tidal field reconstructed from the 2Mass Redshift Survey (2MRS), we investigate the dependence of galaxy morphological type on the shear of large-scale environment where the galaxies are embedded. We first calculate the large scale dimensionless overdensities (d) and the large-scale ellipticities (e) of the regions where the Tully galaxies are located and classify the Tully galaxies according to their morphological types and create subsamples selected at similar value of d but span different ranges in e. We calculate the mean ellipticity, <e>, averaged over each subsample and find a signal of variation of <e> with galaxy morphological type: For the case of 0.5<=d<=1.0, the ellipticals are found to be preferentially located in the regions with low ellipticity. For the case of -0.3<=d<=0.1, the latest-type spirals are found to be preferentially located in the regions with high ellipticity. The null hypothesis that the mean ellipticities of the regions where the ellipticals and the latest type spirals are located are same as the global mean ellipticity averaged over all types is rejected at 3 sigma level when -0.3<=d<=0.1. Yet, no signal of galaxy-shear correlation is found in the highly overdense/underdense regions. The observed trend suggests that the formation epochs of galactic halos might be a function not only of halo mass and large-scale density but also of large-scale shear.
[ { "version": "v1", "created": "Thu, 10 Jan 2008 13:27:11 GMT" }, { "version": "v2", "created": "Mon, 28 Jul 2008 23:59:36 GMT" } ]
2009-11-13T00:00:00
[ [ "Lee", "Jounghun", "", "Seoul Nat'l Univ." ], [ "Lee", "Bomee", "", "Seoul Nat'l Univ." ] ]
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801.1559
Leslie Woodcock PhD
Leslie V. Woodcock
From the ideal gas to an ideal glass: reversible path to random close packing
Letter to Nature December 2007 12 pages 4 figures
null
null
null
cond-mat.dis-nn cond-mat.soft
null
A reproducible RCP state is obtained by a well-defined rate process, which is first-order in free volume, starting from an equilibrium thermodynamic state of the hard-sphere fluid. The RCP state is also reproduced by a thermodynamic pathway that inhibits the frequent production of small crystal nucleites which can lead to heterogeneities at close packing. The simple-cubic single-occupancy (SCSO) cell system, in which crystallization is de facto prohibited, provides a reversible path all the way from the ideal gas to the ideal glass (RCP). By such a route, unique characterization of RCP becomes possible.
[ { "version": "v1", "created": "Thu, 10 Jan 2008 08:19:44 GMT" } ]
2008-01-11T00:00:00
[ [ "Woodcock", "Leslie V.", "" ] ]
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801.156
E. Ahmed
E. Ahmed, A. S. Elgazzar and M. I. Shehata
On differences between fractional and integer order differential equations for dynamical games
4 pages
null
10.1515/zna-2008-3-406
null
q-bio.PE
null
We argue that fractional order (FO) differential equations are more suitable to model complex adaptive systems (CAS). Hence they are applied in replicator equations for non-cooperative game. Rock-Scissors-Paper game is discussed. It is known that its integer order model does not have a stable equilibrium. Its fractional order model is shown to have a locally asymptotically stable internal solution. A FO asymmetric game is shown to have a locally asymptotically stable internal solution. This is not the case for its integer order counterpart.
[ { "version": "v1", "created": "Thu, 10 Jan 2008 08:27:29 GMT" } ]
2015-05-13T00:00:00
[ [ "Ahmed", "E.", "" ], [ "Elgazzar", "A. S.", "" ], [ "Shehata", "M. I.", "" ] ]
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801.1561
Naoto Yokoi
Yoichi Kazama, Naoto Yokoi
Superstring in the plane-wave background with RR flux as a conformal field theory
37 pages, Latex, no figure; published version
JHEP 0803:057,2008
10.1088/1126-6708/2008/03/057
UT-Komaba 08-2
hep-th
null
We study the type IIB superstring in the plane-wave background with Ramond-Ramond flux and formulate it as an exact conformal field theory in operator formalism. One of the characteristic features of the superstring in a consistent background with RR flux, such as the AdS5xS5 and its plane-wave limit, is that the left- and the right-moving degrees of freedom on the worldsheet are inherently coupled. In the plane-wave case, it is manifested in the well-known fact that the Green-Schwarz formulation of the theory reduces to that of free massive bosons and fermions in the light-cone gauge. This raises the obvious question as to how this feature is reconciled with the underlying conformal symmetry of the string theory. By adopting the semi-light-cone conformal gauge, we will show that, despite the existence of such non-linear left-right couplings, one can construct two independent sets of quantum Virasoro operators in terms of fields obeying the free-field commutation relations. Furthermore, we demonstrate that the BRST cohomology analysis reproduces the physical spectrum obtained in the light-cone gauge.
[ { "version": "v1", "created": "Thu, 10 Jan 2008 08:29:50 GMT" }, { "version": "v2", "created": "Mon, 21 Jan 2008 06:39:52 GMT" }, { "version": "v3", "created": "Tue, 13 May 2008 10:55:59 GMT" } ]
2009-12-10T00:00:00
[ [ "Kazama", "Yoichi", "" ], [ "Yokoi", "Naoto", "" ] ]
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801.1562
S Habib Mazharimousavi
S. Habib Mazharimousavi and M. Halilsoy
5D-Black Hole Solution in Einstein-Yang-Mills-Gauss-Bonnet Theory
5 pages, no figures
Phys.Rev.D76:087501,2007
10.1103/PhysRevD.76.087501
null
gr-qc
null
By adopting the 5D version of the Wu-Yang Ansatz we present in closed form a black hole solution in the Einstein-Yang-Mills-Gauss-Bonnet (EYMGB) theory. In the EYM limit, we recover the 5D black hole solution already known.
[ { "version": "v1", "created": "Thu, 10 Jan 2008 08:34:54 GMT" } ]
2008-11-26T00:00:00
[ [ "Mazharimousavi", "S. Habib", "" ], [ "Halilsoy", "M.", "" ] ]
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801.1563
M. Ebrahim Fouladvand
M. Ebrahim Foulaadvand, Sanaz Chaaboki and Modjtaba Saalehi
Characteristics of the asymmetric simple exclusion process in the presence of quenched spatial disorder
9 pages, 22 eps figures, Revtex
Phys. Rev. E, 75, 011127 (2007)
10.1103/PhysRevE.75.011127
null
cond-mat.stat-mech cond-mat.dis-nn
null
We investigate the effect of quenched spatial disordered hopping rates on the characteristics of the asymmetric simple exclusion process (ASEP) with open boundaries both numerically and by extensive simulations. Disorder averages of the bulk density and current are obtained in terms of various input and output rates. We study the binary and uniform distributions of disorder. It is verified that the effect of spatial inhomogeneity is generically to enlarge the size of the maximal current phase. This is in accordance with the mean field results obtained by Harris and Stinchcombe. Furthermore, we obtain the dependence of the current and the bulk density on the characteristics of the disorder distribution function. It is shown that the impact of disorder crucially depends on the particle input and out rates. In some situations, disorder can constructively enhance the current.
[ { "version": "v1", "created": "Thu, 10 Jan 2008 08:53:40 GMT" } ]
2009-11-13T00:00:00
[ [ "Foulaadvand", "M. Ebrahim", "" ], [ "Chaaboki", "Sanaz", "" ], [ "Saalehi", "Modjtaba", "" ] ]
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801.1564
Andrew King
A.R. King, J.E. Pringle, J.A. Hofmann
The Evolution of Black Hole Mass and Spin in Active Galactic Nuclei
MNRAS, in press
null
10.1111/j.1365-2966.2008.12943.x
null
astro-ph
null
We argue that supermassive black hole growth in AGN occurs via sequences of randomly--oriented accretion discs with angular momentum limited by self--gravity. These stably co-- or counter--align with the black hole spin with almost equal frequency. Accretion from these discs very rapidly adjusts the hole's spin parameter to average values $\bar a \sim 0.1-0.3$ (the precise range depending slightly on the disc vertical viscosity coefficient $\alpha_2$) from any initial conditions, but with significant fluctuations ($\Delta a\sim \pm 0.2$) about these. We conclude (a) AGN black holes should on average spin moderately, with the mean value $\bar a$ decreasing slowly as the mass increases; (b) SMBH coalescences leave little long--term effect on $\bar a$; (c) SMBH coalescence products in general have modest recoil velocities, so that there is little likelihood of their being ejected from the host galaxy; (d) black holes can grow even from stellar masses to $\sim 5\times 10^9 \msun$ at high redshift $z\sim 6$; (e) jets produced in successive accretion episodes can have similar directions, but after several episodes the jet direction deviates significantly. Rare examples of massive holes with larger spin parameters could result from prograde coalescences with SMBH of similar mass, and are most likely to be found in giant ellipticals. We compare these results with observation. (abridged)
[ { "version": "v1", "created": "Thu, 10 Jan 2008 09:20:04 GMT" } ]
2009-11-13T00:00:00
[ [ "King", "A. R.", "" ], [ "Pringle", "J. E.", "" ], [ "Hofmann", "J. A.", "" ] ]
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801.1565
Ruth Lazkoz
Christian G. Boehmer, Gabriela Caldera-Cabral, Ruth Lazkoz, Roy Maartens
Dynamics of dark energy with a coupling to dark matter
11 pages, 4 figures, revtex, references added
Phys.Rev.D78:023505,2008
10.1103/PhysRevD.78.023505
null
gr-qc astro-ph
null
Dark energy and dark matter are the dominant sources in the evolution of the late universe. They are currently only indirectly detected via their gravitational effects, and there could be a coupling between them without violating observational constraints. We investigate the background dynamics when dark energy is modelled as exponential quintessence, and is coupled to dark matter via simple models of energy exchange. We introduce a new form of dark sector coupling, which leads to a more complicated dynamical phase space and has a better physical motivation than previous mathematically similar couplings.
[ { "version": "v1", "created": "Thu, 10 Jan 2008 12:25:51 GMT" }, { "version": "v2", "created": "Wed, 23 Jan 2008 19:01:01 GMT" } ]
2008-11-26T00:00:00
[ [ "Boehmer", "Christian G.", "" ], [ "Caldera-Cabral", "Gabriela", "" ], [ "Lazkoz", "Ruth", "" ], [ "Maartens", "Roy", "" ] ]
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801.1566
Aleksi Kurkela
Ph. de Forcrand, A.Kurkela, A.Vuorinen
Center-Symmetric Effective Theory for High-Temperature SU(2) Yang-Mills Theory
24 pages, 6 figures. v2: small clarifications and updates; published version
Phys.Rev.D77:125014,2008
10.1103/PhysRevD.77.125014
CERN-PH-TH/2008-007
hep-ph hep-lat
null
We construct and study a dimensionally reduced effective theory for high-temperature SU(2) Yang-Mills theory that respects all the symmetries of the underlying theory. Our main motivation is to study, whether the correct treatment of the center symmetry can help extend the applicability of the dimensional reduction procedure towards the confinement transition. After performing perturbative matching to the full theory at asymptotically high temperatures, we map the phase diagram of the effective theory using non-perturbative lattice simulations. We find that at lower temperature the theory undergoes a second order confining phase transition, in complete analogy with the full theory, which is a direct consequence of having incorporated the center symmetry.
[ { "version": "v1", "created": "Thu, 10 Jan 2008 20:57:00 GMT" }, { "version": "v2", "created": "Tue, 6 May 2008 09:43:51 GMT" } ]
2008-11-26T00:00:00
[ [ "de Forcrand", "Ph.", "" ], [ "Kurkela", "A.", "" ], [ "Vuorinen", "A.", "" ] ]
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801.1567
Reinhold Walser
R. Walser, E. Goldobin, O. Crasser, D. Koelle, R. Kleiner and W. P. Schleich
Semifluxons in Superconductivity and Cold Atomic Gases
15 pages (Latex), 6 color figures (eps)
null
10.1088/1367-2630/10/4/045020
null
cond-mat.mes-hall cond-mat.supr-con
null
Josephson junctions and junction arrays are well studied devices in superconductivity. With external magnetic fields one can modulate the phase in a long junction and create traveling, solitonic waves of magnetic flux, called fluxons. Today, it is also possible to device two different types of junctions: depending on the sign of the critical current density, they are called 0- or pi-junction. In turn, a 0-pi junction is formed by joining two of such junctions. As a result, one obtains a pinned Josephson vortex of fractional magnetic flux, at the 0-pi boundary. Here, we analyze this arrangement of superconducting junctions in the context of an atomic bosonic quantum gas, where two-state atoms in a double well trap are coupled in an analogous fashion. There, an all-optical 0-pi Josephson junction is created by the phase of a complex valued Rabi-frequency and we a derive a discrete four-mode model for this situation, which qualitatively resembles a semifluxon.
[ { "version": "v1", "created": "Thu, 10 Jan 2008 09:36:23 GMT" } ]
2009-11-13T00:00:00
[ [ "Walser", "R.", "" ], [ "Goldobin", "E.", "" ], [ "Crasser", "O.", "" ], [ "Koelle", "D.", "" ], [ "Kleiner", "R.", "" ], [ "Schleich", "W. P.", "" ] ]
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801.1568
Arkadiy Skopenkov
A. Skopenkov
Basic differential geometry as a sequence of interesting problems
66 pages, 10 figures, the book is rewritten. MCCME, Moscow, 2008
published by MCCME, Moscow, 2008, 2009, 2016, ISBN 978-5-4439-1065-9
null
null
math.DG math.MG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This book is expository and is in Russian (sample English translation of two pages is given). It is shown how in the course of solution of interesting geometric problems (close to applications) naturally appear different notions of curvature, which distinguish given geometry from the 'ordinary' one. Direct elementary definitions of these notions are presented. The book is accessible for students familiar with analysis of several variables, and could be an interesting easy reading for professional mathematicians. The material is presented as a sequence of problems, which is peculiar not only to Zen monasteries but also to serious mathematical education.
[ { "version": "v1", "created": "Thu, 10 Jan 2008 09:44:23 GMT" }, { "version": "v2", "created": "Sat, 7 Feb 2009 11:28:53 GMT" }, { "version": "v3", "created": "Wed, 3 Mar 2010 15:10:58 GMT" }, { "version": "v4", "created": "Thu, 2 Jan 2014 07:59:20 GMT" } ]
2021-12-20T00:00:00
[ [ "Skopenkov", "A.", "" ] ]
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801.1569
Fabrizio Zanello
Juan C. Migliore, Uwe Nagel, Fabrizio Zanello
Bounds and asymptotic minimal growth for Gorenstein Hilbert functions
Several minor changes; to appear in J. Algebra
J. Algebra 321 (2009), No. 5, 1510-1521
null
null
math.AC
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We determine new bounds on the entries of Gorenstein Hilbert functions, both in any fixed codimension and asymptotically. Our first main theorem is a lower bound for the degree $i+1$ entry of a Gorenstein $h$-vector, in terms of its entry in degree $i$. This result carries interesting applications concerning unimodality: indeed, an important consequence is that, given $r$ and $i$, all Gorenstein $h$-vectors of codimension $r$ and socle degree $e\geq e_0=e_0(r,i)$ (this function being explicitly computed) are unimodal up to degree $i+1$. This immediately gives a new proof of a theorem of Stanley that all Gorenstein $h$-vectors in codimension three are unimodal. Our second main theorem is an asymptotic formula for the least value that the $i$-th entry of a Gorenstein $h$-vector may assume, in terms of codimension, $r$, and socle degree, $e$. This theorem broadly generalizes a recent result of ours, where we proved a conjecture of Stanley predicting that asymptotic value in the specific case $e=4$ and $i=2$, as well as a result of Kleinschmidt which concerned the logarithmic asymptotic behavior in degree $i= \lfloor \frac{e}{2} \rfloor $.
[ { "version": "v1", "created": "Thu, 10 Jan 2008 09:53:58 GMT" }, { "version": "v2", "created": "Sat, 29 Nov 2008 19:49:56 GMT" } ]
2009-03-10T00:00:00
[ [ "Migliore", "Juan C.", "" ], [ "Nagel", "Uwe", "" ], [ "Zanello", "Fabrizio", "" ] ]
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801.157
Gabriele Ferrari
V.V. Ivanov, A. Alberti, M. Schioppo, G. Ferrari, M. Artoni, M. L. Chiofalo, and G. M. Tino
Coherent Delocalization of Atomic Wave Packets in Driven Lattice Potentials
4 pages
null
10.1103/PhysRevLett.100.043602
null
physics.atom-ph physics.optics
null
Atomic wave packets loaded into a phase-modulated vertical optical-lattice potential exhibit a coherent delocalization dynamics arising from intraband transitions among Wannier-Stark levels. Wannier-Stark intraband transitions are here observed by monitoring the in situ wave-packet extent. By varying the modulation frequency, we find resonances at integer multiples of the Bloch frequency. The resonances show a Fourier-limited width for interrogation times up to 2 s. This can also be used to determine the gravity acceleration with ppm resolution.
[ { "version": "v1", "created": "Thu, 10 Jan 2008 09:54:07 GMT" } ]
2009-11-13T00:00:00
[ [ "Ivanov", "V. V.", "" ], [ "Alberti", "A.", "" ], [ "Schioppo", "M.", "" ], [ "Ferrari", "G.", "" ], [ "Artoni", "M.", "" ], [ "Chiofalo", "M. L.", "" ], [ "Tino", "G. M.", "" ] ]
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801.1571
Xavier Artru
X. Artru (IPNL)
Classical and quantum constraints in spin physics
null
Dans Proceeding of the XII Workshop on High-Energy Spin Physics - XII Workshop on High Energy Spin Physics, Dubna (2007)
null
null
hep-ph quant-ph
null
Constraints on spin observables coming from discrete symmetries such as P, C, T and identical particles may be divided in two types: 1) classical ones, which insure the invariance of the cross sections under the symmetry operation; 2) non-classical ones, which can only be obtained at the level of amplitudes. Similarly, positivity constraints can be divided into classical and non-classical constraints. The former insure the positivity of the cross section for arbitrary individual polarisations of the external particles, the latter extend this requirement to the case of entangled external spins. The domain of classical positivity is shown to be dual to the domain of separability
[ { "version": "v1", "created": "Thu, 10 Jan 2008 10:18:12 GMT" } ]
2008-01-17T00:00:00
[ [ "Artru", "X.", "", "IPNL" ] ]
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801.1572
Emilio Santos Corchero
Emilio Santos
Preliminary analysis of a recent experiment by F. A. Bovino
10 pages, no figures
null
null
null
quant-ph
null
An analysis is made of the results of a recent polarization correlation experiment by Bovino (unpublished) where about 60,000 data have been obtained. I assume that the state of the photon pairs produced in the source (a non-linear crystal) are in a (slightly)non-maximally entangled state and the most relevant non-idealities of the set-up are taken into account. A comparison is made between the predictions of quantum mechanics and a simple family of local hidden varaibles models with the result that the former is violated by more than 4 standard deviations whislt the data are compatible with the family of local models.
[ { "version": "v1", "created": "Thu, 10 Jan 2008 10:20:30 GMT" } ]
2008-01-11T00:00:00
[ [ "Santos", "Emilio", "" ] ]
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