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711.3408
Virginie Malaval
Abdelkader Yanallah (LPQ3M, LAPTH), Mohammed Brahim Zahaf (LPQ3M, LAPTH)
New connection formulae for some q-orthogonal polynomials in q-Askey scheme
null
null
10.1088/1751-8113/41/8/085209
LAPTH-1215/07
hep-th math-ph math.MP
null
New nonlinear connection formulae of the q-orthogonal polynomials, such continuous q-Laguerre, continuous big q-Hermite, q-Meixner-Pollaczek and q-Gegenbauer polynomials, in terms of their respective classical analogues are obtained using a special realization of the q-exponential function as infinite multiplicative series of ordinary exponential function.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 16:36:44 GMT" } ]
2009-11-13T00:00:00
[ [ "Yanallah", "Abdelkader", "", "LPQ3M, LAPTH" ], [ "Zahaf", "Mohammed Brahim", "", "LPQ3M,\n LAPTH" ] ]
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711.3409
William Schoenell
W. Schoenell, M. Cervino, R. Cid Fernandes, A. Mateus, E. Terlevich, R. Terlevich, F. de los Santos, J.P. Torres-Papaqui and V. Luridiana
Results of an analysis of SDSS galaxies in the VO
Poster contribution to "Workshop on Astronomical Spectroscopy and the Virtual Observatory" ESA pub in press. 2 pages
null
null
null
astro-ph
null
We present here the VO access to the results of an analysis of the spectra of Sloan Digital Sky Survey (SDSS) galaxies performed with the STARLIGHT code by Cid Fernandes et al. (2005). The results include for each galaxy the original SDSS spectrum, the best-fit synthetic spectrum, the star formation history, the pure emission line spectrum corrected from underlying stellar population (in SDSS emission line galaxies) and the intensity of several emission/absorption lines. The database will be accessible from the PGos3 at the end of summer 2007.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 16:52:36 GMT" } ]
2007-11-22T00:00:00
[ [ "Schoenell", "W.", "" ], [ "Cervino", "M.", "" ], [ "Fernandes", "R. Cid", "" ], [ "Mateus", "A.", "" ], [ "Terlevich", "E.", "" ], [ "Terlevich", "R.", "" ], [ "Santos", "F. de los", "" ], [ "Torres-Papaqui", "J. P.", "" ], [ "Luridiana", "V.", "" ] ]
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711.341
Laura Tolos
Laura Tolos, Angels Ramos and Tetsuro Mizutani
Self-consistent coupled-channel approach to $D$ and $\bar D$ in hot dense matter
8 pages, 5 figures, to appear in the proceedings of XII International Conference on Hadron Spectroscopy (HADRON07), Frascati, Italy, 8-13 October 2007
null
null
null
nucl-th hep-ph
null
A self-consistent coupled-channel approach is used to study the properties of $D$ and $\bar D$ mesons in hot dense matter. The starting point is a broken SU(4) s-wave Tomozawa-Weinberg $DN$ ($\bar DN$) interaction supplemented by an attractive isoscalar-scalar term. The Pauli blocking effects, baryon mean-field bindings, and $\pi$ and open-charm meson self-energies are incorporated in dense matter at finite temperature. In the $DN$ sector, the dynamically generated $\tilde\Lambda_c$ and $\tilde\Sigma_c$ resonances remain close to their free space position while acquiring a remarkable width because of the thermal smearing of Pauli blocking. Therefore, the $D$ meson spectral density shows a single pronounced quasiparticle peak close to the free mass, that broadens with increasing density, and a low energy tail associated to smeared $\tilde\Lambda_c N^{-1}$, $\tilde\Sigma_c N^{-1}$ configurations. In the $\bar DN$ case, the low-density approximation to the repulsive $\bar D$ self-energy is found unreliable already at subsaturation densities. From this study we speculate the possible existence of $D$-mesic nuclei. We also discuss the consequences for $J/\Psi$ suppression at FAIR.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 16:49:51 GMT" } ]
2007-11-22T00:00:00
[ [ "Tolos", "Laura", "" ], [ "Ramos", "Angels", "" ], [ "Mizutani", "Tetsuro", "" ] ]
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711.3411
Wendong Wang
Wendong Wang, Liqun Zhang
The $C^{\a}$ regularity of a class of non-homogeneous ultraparabolic equations
30 pages
null
null
null
math.AP math.DG
null
We obtain the $C^{\a}$ regularity for weak solutions of a class of non-homogeneous ultraparabolic equation, with measurable coefficients. The result generalizes our recent $C^{\a}$ regularity results of homogeneous ultraparabolic equation.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 16:47:42 GMT" }, { "version": "v2", "created": "Mon, 31 Mar 2008 05:19:12 GMT" } ]
2008-03-31T00:00:00
[ [ "Wang", "Wendong", "" ], [ "Zhang", "Liqun", "" ] ]
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711.3412
Eric Laporte
Ivan Berlocher, Hyun-Gue Huh (IGM-LabInfo), Eric Laporte (IGM-LabInfo), Jee-Sun Nam
Morphological annotation of Korean with Directly Maintainable Resources
null
Dans Proceedings of the Language Resource and Evaluation Consference (LREC) - Morphological annotation of Korean with Directly Maintainable Resources, Genoa : Italie (2006)
null
null
cs.CL
null
This article describes an exclusively resource-based method of morphological annotation of written Korean text. Korean is an agglutinative language. Our annotator is designed to process text before the operation of a syntactic parser. In its present state, it annotates one-stem words only. The output is a graph of morphemes annotated with accurate linguistic information. The granularity of the tagset is 3 to 5 times higher than usual tagsets. A comparison with a reference annotated corpus showed that it achieves 89% recall without any corpus training. The language resources used by the system are lexicons of stems, transducers of suffixes and transducers of generation of allomorphs. All can be easily updated, which allows users to control the evolution of the performances of the system. It has been claimed that morphological annotation of Korean text could only be performed by a morphological analysis module accessing a lexicon of morphemes. We show that it can also be performed directly with a lexicon of words and without applying morphological rules at annotation time, which speeds up annotation to 1,210 word/s. The lexicon of words is obtained from the maintainable language resources through a fully automated compilation process.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 16:47:57 GMT" } ]
2007-11-22T00:00:00
[ [ "Berlocher", "Ivan", "", "IGM-LabInfo" ], [ "Huh", "Hyun-Gue", "", "IGM-LabInfo" ], [ "Laporte", "Eric", "", "IGM-LabInfo" ], [ "Nam", "Jee-Sun", "" ] ]
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711.3413
Kyryl Kazymyrenko Dr
Kyryl Kazymyrenko, Xavier Waintal
A knitting algorithm for calculating Green functions in quantum systems
7 pages, 5 figures, version for PRB
Phys. Rev. B 77, 115119 (2008)
10.1103/PhysRevB.77.115119
null
cond-mat.mes-hall
null
We propose a fast and versatile algorithm to calculate local and transport properties such as conductance, shot noise, local density of state or local currents in mesoscopic quantum systems. Within the non equilibrium Green function formalism, we generalize the recursive Green function technique to tackle multiterminal devices with arbitrary geometries. We apply our method to analyze two recent experiments: an electronic Mach-Zehnder interferometer in a 2D gas and a Hall bar made of graphene nanoribbons in quantum Hall regime. In the latter case, we find that the Landau edge state pinned to the Dirac point gets diluted upon increasing carrier density.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 16:59:07 GMT" }, { "version": "v2", "created": "Tue, 19 Feb 2008 15:19:27 GMT" } ]
2008-03-18T00:00:00
[ [ "Kazymyrenko", "Kyryl", "" ], [ "Waintal", "Xavier", "" ] ]
[ -0.0284217838, 0.0462404825, 0.0204763543, 0.0190717895, -0.0208068397, -0.0300466735, -0.0746347234, -0.0056010471, -0.037427526, -0.0500410683, 0.0367390141, 0.0487742051, -0.0653260425, 0.0687961429, 0.0190304779, 0.0145276077, -0.0225556605, 0.036711473, 0.0671987906, 0.1296606213, 0.0101349, -0.0983195454, 0.0871381089, 0.0282290019, -0.0353069082, -0.0419992469, 0.0778294206, 0.0293306205, 0.0905531272, -0.0532357655, 0.073422946, -0.0151610393, -0.0591018908, -0.1645819694, -0.0424398929, 0.0513630137, -0.085706003, 0.0733678639, -0.069732517, 0.0179563984, -0.020517664, -0.1006880254, -0.0723764077, 0.0597628616, 0.094133392, -0.0288624316, -0.0505643375, -0.0498758256, 0.0584409162, 0.0195812881, -0.0310381316, 0.0120902751, -0.0745245665, -0.0246074274, -0.0414208956, -0.0336544774, -0.0206966773, 0.0092467191, 0.0225832015, 0.0234782677, 0.0358852558, -0.0909937769, 0.0221150126, 0.0275542587, -0.1549978703, 0.0644998252, -0.0755711049, 0.0564029217, 0.0905531272, 0.0851001143, -0.0760668293, 0.0782149881, 0.1064715311, -0.1168818325, -0.0324977785, -0.0754058585, -0.0153538231, -0.0275404882, -0.0505643375, 0.0857610852, 0.0616906956, -0.0488568284, 0.0717705116, -0.0194711257, -0.0085306661, -0.0439821593, 0.0496830419, -0.1131363288, -0.0546954125, -0.0461578593, 0.0015104237, 0.069567278, -0.0439821593, 0.0819054171, 0.0481132343, 0.0416962989, 0.1131363288, 0.0441474058, 0.0262460858, -0.055962272, -0.0357750952, -0.0078696944, 0.0753507763, -0.1239321977, 0.2040199488, -0.0271411519, -0.0964467898, 0.0627923161, 0.0206691362, 0.0721560791, 0.0134328734, -0.0672538728, 0.0220048502, 0.03935536, -0.0243044812, -0.0763422325, -0.0420543253, -0.0846043825, 0.0046440149, 0.0648303106, -0.0249516834, 0.0147892423, 0.0428805426, -0.0069229905, 0.0060520223, -0.0288073514, 0.0133571373, -0.1098865494, -0.0747448877, 0.0605890751, 0.0971628428, -0.0299640521, -0.0256539658, -0.0293581616, -0.0007151921, -0.0225969721, 0.0001467392, 0.0188652351, 0.0362157449, 0.0106512839, -0.0126204295, 0.051197771, 0.0432385691, 0.0663174987, 0.0620762631, 0.1037725657, 0.016785929, 0.1252541393, -0.0100591639, 0.019898003, 0.0040691071, 0.0608644821, -0.0122210924, 0.0493800975, 0.0665929019, -0.1312028915, 0.0708341375, 0.125143975, 0.0067129941, -0.0283942446, -0.0261221547, 0.0789861232, -0.0708892196, 0.0096735964, 0.0653260425, 0.0088060712, -0.0998618156, -0.0054805572, 0.0122417472, -0.0566783249, 0.0578350276, -0.125143975, 0.0201596376, 0.0626270697, 0.0636185333, 0.0237123612, -0.0177911557, -0.0899472386, -0.0776090994, 0.0507020392, -0.0332689099, -0.0651057139, 0.0632329658, -0.0848797858, -0.0428805426, -0.015326282, 0.0660420954, 0.0557419509, -0.0145689184, 0.0380609557, -0.0496279597, 0.1153395697, 0.0480581522, 0.0857610852, -0.0255300328, -0.0919852331, 0.1026158631, 0.0032170734, 0.0299915932, -0.0428530015, -0.0610848032, -0.0701731667, 0.0293857027, -0.0255575739, -0.015450214, -0.0281601492, -0.0104998117, -0.0882397294, -0.0871381089, -0.0428254604, 0.0298814308, 0.0567884892, 0.0305148624, -0.0086614834, 0.0129646854, 0.0310381316, -0.0726518109, 0.0859814063, -0.0381435789, 0.0843289793, -0.0767828822, 0.0397409275, 0.0654361993, 0.1045987755, 0.0529328212, 0.0545026287, 0.0906082094, -0.0446155928, 0.0537039526, -0.0927012861, 0.0269483682, 0.0294132419, -0.0057559623, -0.0563753806, -0.0178049263, -0.0513630137, 0.0110575063, -0.0320295878, -0.1094459072, -0.1084544435, -0.0786556378, 0.0284493249, -0.0042171376, -0.0102932574, -0.0027161806, 0.0105273519, -0.0940783098, 0.0413658135, 0.1437613517, -0.0303496197, -0.1607262939, 0.1108229309, 0.0415035188, -0.016069876, -0.0776641816, 0.0123587949 ]
711.3414
Adam D. Myers
Robert J. Brunner (UIUC and NCSA), Volodymyr V. Kindratenko (UIUC and NCSA), Adam D. Myers (UIUC)
Developing and Deploying Advanced Algorithms to Novel Supercomputing Hardware
On speeding up cosmology calculations using alternative hardware technologies, appeared in Proc. NASA Science Technology Conference - NSTC'07, 8 pages
null
null
null
astro-ph
null
The objective of our research is to demonstrate the practical usage and orders of magnitude speedup of real-world applications by using alternative technologies to support high performance computing. Currently, the main barrier to the widespread adoption of this technology is the lack of development tools and case studies that typically impede non-specialists that might otherwise develop applications that could leverage these technologies. By partnering with the Innovative Systems Laboratory at the National Center for Supercomputing, we have obtained access to several novel technologies, including several Field-Programmable Gate Array (FPGA) systems, NVidia Graphics Processing Units (GPUs), and the STI Cell BE platform. Our goal is to not only demonstrate the capabilities of these systems, but to also serve as guides for others to follow in our path. To date, we have explored the efficacy of the SRC-6 MAP-C and MAP-E and SGI RASC Athena and RC100 reconfigurable computing platforms in supporting a two-point correlation function which is used in a number of different scientific domains. In a brute force test, the FPGA based single-processor system has achieved an almost two orders of magnitude speedup over a single-processor CPU system. We are now developing implementations of this algorithm on other platforms, including one using a GPU. Given the considerable efforts of the cosmology community in optimizing these classes of algorithms, we are currently working to implement an optimized version of the basic family of correlation functions by using tree-based data structures. Finally, we are also exploring other algorithms, such as instance-based classifiers, power spectrum estimators, and higher-order correlation functions that are also commonly used in a wide range of scientific disciplines.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 17:09:54 GMT" } ]
2007-11-22T00:00:00
[ [ "Brunner", "Robert J.", "", "UIUC and NCSA" ], [ "Kindratenko", "Volodymyr V.", "", "UIUC and\n NCSA" ], [ "Myers", "Adam D.", "", "UIUC" ] ]
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711.3415
Tamara Nunner
Tamara S. Nunner, Gergely Zarand, Felix von Oppen
Anomalous Hall effect in a two dimensional electron gas with magnetic impurities
5 pages, 3 figures
null
10.1103/PhysRevLett.100.236602
null
cond-mat.mtrl-sci
null
Magnetic impurities play an important role in many spintronics-related materials. Motivated by this fact, we study the anomalous Hall effect in the presence of magnetic impurities, focusing on two-dimensional electron systems with Rashba spin-orbit coupling. We find a highly nonlinear dependence on the impurity polarization, including possible sign changes. At small impurity magnetizations, this is a consequence of the remarkable result that the linear term is independent of the spin-orbit coupling strength. Near saturation of the impurity spins, the anomalous Hall conductivity can be resonantly enhanced, due to interference between potential and magnetic scattering.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 17:06:21 GMT" } ]
2009-11-13T00:00:00
[ [ "Nunner", "Tamara S.", "" ], [ "Zarand", "Gergely", "" ], [ "von Oppen", "Felix", "" ] ]
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711.3416
Ram Band
Ram Band, Idan Oren and Uzy Smilansky
Nodal domains on graphs - How to count them and why?
Some corrections according to the referees report were made
Analysis on Graphs and its applications Proc. Symp. Pure Math. (Providence, RI: American Mathematical Society) (2008) 5-28.
null
null
math-ph math.MP
null
The purpose of the present manuscript is to collect known results and present some new ones relating to nodal domains on graphs, with special emphasize on nodal counts. Several methods for counting nodal domains will be presented, and their relevance as a tool in spectral analysis will be discussed.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 17:07:23 GMT" }, { "version": "v2", "created": "Thu, 29 Nov 2007 11:38:03 GMT" }, { "version": "v3", "created": "Tue, 19 Feb 2008 16:25:00 GMT" } ]
2009-07-18T00:00:00
[ [ "Band", "Ram", "" ], [ "Oren", "Idan", "" ], [ "Smilansky", "Uzy", "" ] ]
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711.3417
Chethan Krishnan
Willy Fischler, Chethan Krishnan, Sonia Paban, Marija Zanic
Vacuum Bubble in an Inhomogeneous Cosmology
31 pages, 21(!) figures, v2: minor changes, figures re-sized (might require zoom on some systems), references added
JHEP0805:041,2008
10.1088/1126-6708/2008/05/041
null
hep-th astro-ph hep-ph
null
We study the propagation of bubbles of new vacuum in a radially inhomogeneous Lemaitre-Tolman-Bondi background that includes a cosmological constant. This exemplifies the classical evolution of a tunneling bubble through a metastable state with curvature inhomogeneities, and will be relevant in the context of the Landscape. We demand that the matter profile in the LTB background satisfy the weak energy condition. For sample profiles that satisfy this restriction, we find that the evolution of the bubble (in terms of the physically relevant coordinates intrinsic to the shell) is largely unaffected by the prsence of local inhomogeneities. Our setup should also be a useful toy model for capturing the effects of ambient inhomogeneities on an inflating region.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 17:55:18 GMT" }, { "version": "v2", "created": "Thu, 10 Apr 2008 11:58:31 GMT" } ]
2008-11-26T00:00:00
[ [ "Fischler", "Willy", "" ], [ "Krishnan", "Chethan", "" ], [ "Paban", "Sonia", "" ], [ "Zanic", "Marija", "" ] ]
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711.3418
Massimo Meneghetti
Massimo Meneghetti, Peter Melchior, Andrea Grazian, Gabriella De Lucia, Klaus Dolag, Matthias Bartelmann, Catherine Heymans, Lauro Moscardini, Mario Radovich
Realistic simulations of gravitational lensing by galaxy clusters: extracting arc parameters from mock DUNE images
17 pages, 15 figures submitted to A&A
null
10.1051/0004-6361:20079119
null
astro-ph
null
We present a newly developed code that allows simulations of optical observations of galaxy fields with a variety of instruments. The code incorporates gravitational lensing effects and is targetted at simulating lensing by galaxy clusters. Our goal is to create the tools required for comparing theoretical expectations with observations to obtain a better understanding of how observational noise affects lensing applications such as mass estimates, studies on the internal properties of galaxy clusters and arc statistics. Starting from a set of input parameters, characterizing both the instruments and the observational conditions, the simulator provides a virtual observation of a patch of the sky. It includes several sources of noise such as photon-noise, sky background, seeing, and instrumental noise. Ray-tracing through simulated mass distributions accounts for gravitational lensing. Source morphologies are realistically simulated based on shapelet decompositions of galaxy images retrieved from the GOODS-ACS archive. According to their morphological class, spectral-energy-distributions are assigned to the source galaxies in order to reproduce observations of each galaxy in arbitrary photometric bands. We illustrate our techniques showing virtual observations of a galaxy-cluster core as it would be observed with the space telescope DUNE, which was recently proposed to ESA within its "Cosmic vision" programme. (Abridged)
[ { "version": "v1", "created": "Wed, 21 Nov 2007 19:22:34 GMT" } ]
2009-11-13T00:00:00
[ [ "Meneghetti", "Massimo", "" ], [ "Melchior", "Peter", "" ], [ "Grazian", "Andrea", "" ], [ "De Lucia", "Gabriella", "" ], [ "Dolag", "Klaus", "" ], [ "Bartelmann", "Matthias", "" ], [ "Heymans", "Catherine", "" ], [ "Moscardini", "Lauro", "" ], [ "Radovich", "Mario", "" ] ]
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711.3419
Leo Obrst
Ken Samuel, Leo Obrst, Suzette Stoutenberg, Karen Fox, Paul Franklin, Adrian Johnson, Ken Laskey, Deborah Nichols, Steve Lopez, Jason Peterson
Translating OWL and Semantic Web Rules into Prolog: Moving Toward Description Logic Programs
21 pages, 5 figures, 19 tables. To appear in Theory and Practice of Logic Programming (TPLP), 2008
null
null
null
cs.AI
null
To appear in Theory and Practice of Logic Programming (TPLP), 2008. We are researching the interaction between the rule and the ontology layers of the Semantic Web, by comparing two options: 1) using OWL and its rule extension SWRL to develop an integrated ontology/rule language, and 2) layering rules on top of an ontology with RuleML and OWL. Toward this end, we are developing the SWORIER system, which enables efficient automated reasoning on ontologies and rules, by translating all of them into Prolog and adding a set of general rules that properly capture the semantics of OWL. We have also enabled the user to make dynamic changes on the fly, at run time. This work addresses several of the concerns expressed in previous work, such as negation, complementary classes, disjunctive heads, and cardinality, and it discusses alternative approaches for dealing with inconsistencies in the knowledge base. In addition, for efficiency, we implemented techniques called extensionalization, avoiding reanalysis, and code minimization.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 17:36:50 GMT" } ]
2007-11-22T00:00:00
[ [ "Samuel", "Ken", "" ], [ "Obrst", "Leo", "" ], [ "Stoutenberg", "Suzette", "" ], [ "Fox", "Karen", "" ], [ "Franklin", "Paul", "" ], [ "Johnson", "Adrian", "" ], [ "Laskey", "Ken", "" ], [ "Nichols", "Deborah", "" ], [ "Lopez", "Steve", "" ], [ "Peterson", "Jason", "" ] ]
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711.342
Vladimir Shevelev
Vladimir Shevelev
On Ramanujan Cubic Polynomials
11 pages
null
null
null
math.AC
null
A polynomial x^3+px^2+qx+r with the condition pr^(1/3)+ 3r^(2/3)+q=0 we call a Ramanujan cubic polynomial (RCP). We study different interest properties of RCP, in particular, an important role of a parameter pq/r. We prove some new beautiful identities containing sums of 6 cubic radicals of values of trigonometrical functions as well.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 18:11:21 GMT" } ]
2007-11-22T00:00:00
[ [ "Shevelev", "Vladimir", "" ] ]
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711.3421
Christian Hagendorf
Francois David, Christian Hagendorf, Kay Joerg Wiese
A growth model for RNA secondary structures
null
J. Stat. Mech. (2008) P04008
10.1088/1742-5468/2008/04/P04008
LPTENS 07/54, SPhT-T07/068
q-bio.BM cond-mat.stat-mech
null
A hierarchical model for the growth of planar arch structures for RNA secondary structures is presented, and shown to be equivalent to a tree-growth model. Both models can be solved analytically, giving access to scaling functions for large molecules, and corrections to scaling, checked by numerical simulations of up to 6500 bases. The equivalence of both models should be helpful in understanding more general tree-growth processes.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 17:51:06 GMT" } ]
2008-04-11T00:00:00
[ [ "David", "Francois", "" ], [ "Hagendorf", "Christian", "" ], [ "Wiese", "Kay Joerg", "" ] ]
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711.3422
Chiara Menotti
C. Menotti, M. Lewenstein, T. Lahaye, and T. Pfau
Dipolar interaction in ultra-cold atomic gases
30 pages, 17 figures, to be published in the Proceedings of the Workshop "Dynamics and Thermodynamics of Systems with Long Range Interactions" (Assisi, July 2007), AIP Conference Proceedings
null
10.1063/1.2839130
null
cond-mat.other
null
Ultra-cold atomic systems provide a new setting where to investigate the role of long-range interactions. In this paper we will review the basics features of those physical systems, in particular focusing on the case of Chromium atoms. On the experimental side, we report on the observation of dipolar effects in the expansion dynamics of a Chromium Bose-Einstein condensate. By using a Feshbach resonance, the scattering length characterising the contact interaction can be strongly reduced, thus increasing the relative effect of the dipole-dipole interaction. Such experiments make Chromium atoms the strongest candidates at present for the achievement of the strong dipolar regime. On the theoretical side, we investigate the behaviour of ultra-cold dipolar systems in the presence of a periodic potential. We discuss how to realise this situation experimentally and we characterise the system in terms of its quantum phases and metastable states, discussing in detail the differences with respect to the case of zero-range interactions.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 17:52:47 GMT" } ]
2009-11-13T00:00:00
[ [ "Menotti", "C.", "" ], [ "Lewenstein", "M.", "" ], [ "Lahaye", "T.", "" ], [ "Pfau", "T.", "" ] ]
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711.3423
Neretin Yurii A.
Yuri A Neretin
On beta-function of tube of light cone
7 pages
Journal of Mathematical Sciences (New York), 2011, 174:1, 36-40
10.1007/s10958-011-0279-9
ESI 1978
math.CA math.CV
null
We construct $B$-function of the Hermitian symmetric space $\OO(n,2)/\OO(n)\times \OO(2)$ or equivalently of the tube $(Re z_0)^2> (Re z_1)^2+...+ (Re z_n)^2$ in $C^{n+1}
[ { "version": "v1", "created": "Wed, 21 Nov 2007 17:54:44 GMT" } ]
2012-11-27T00:00:00
[ [ "Neretin", "Yuri A", "" ] ]
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711.3424
Claudio Coriano
R. Armillis, C. Coriano and M. Guzzi
Trilinear Anomalous Gauge Interactions from Intersecting Branes and the Neutral Currents Sector
68 pages, 21 figures Revised Version, to appear in JHEP
JHEP0805:015,2008
10.1088/1126-6708/2008/05/015
null
hep-ph
null
We present a study of the trilinear gauge interactions in extensions of the Standard Model (SM) with several anomalous extra U(1)'s, identified in various constructions, from special vacua of string theory to large extra dimensions. In these models an axion and generalized Chern-Simons interactions for anomalies cancelation are present. We derive generalized Ward identities for these vertices and discuss their structure in the Stuckelberg and Higgs-Stuckelberg phases. We give their explicit expressions in all the relevant cases, which can be used for phenomenological studies of these models at the LHC.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 18:18:51 GMT" }, { "version": "v2", "created": "Thu, 22 Nov 2007 08:42:01 GMT" }, { "version": "v3", "created": "Wed, 19 Mar 2008 15:33:20 GMT" }, { "version": "v4", "created": "Wed, 19 Mar 2008 20:11:44 GMT" }, { "version": "v5", "created": "Wed, 23 Apr 2008 12:43:33 GMT" } ]
2008-11-26T00:00:00
[ [ "Armillis", "R.", "" ], [ "Coriano", "C.", "" ], [ "Guzzi", "M.", "" ] ]
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711.3425
Arnaud Koetsier
Arnaud Koetsier, R. A. Duine, Immanuel Bloch, H. T. C. Stoof
Achieving the Neel state in an optical lattice
4 pages, 2 figures, RevTeX. Revised version incorporates minor corrections. Journal reference added
Phys.Rev.A77:023623,2008
10.1103/PhysRevA.77.023623
ITP-UU-07/67
cond-mat.stat-mech
null
We theoretically study the possibility of reaching the antiferromagnetic phase of the Hubbard model by starting from a normal gas of trapped fermionic atoms and adiabatically ramping up an optical lattice. Requirements on the initial temperature and the number of atoms are determined for a three dimensional square lattice by evaluating the Neel state entropy, taking into account fluctuations around the mean-field solution. We find that these fluctuations place important limitations on adiabatically reaching the Neel state.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 18:26:17 GMT" }, { "version": "v2", "created": "Tue, 26 Feb 2008 13:13:08 GMT" } ]
2014-11-18T00:00:00
[ [ "Koetsier", "Arnaud", "" ], [ "Duine", "R. A.", "" ], [ "Bloch", "Immanuel", "" ], [ "Stoof", "H. T. C.", "" ] ]
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711.3426
Brian Cowan
M. Poole, J. Saunders, B. Cowan
Stages of Homogeneous Nucleation in Solid Isotopic Helium Mixtures
Submitted to PRL
null
10.1103/PhysRevLett.100.075301
null
cond-mat.other
null
We have made pressure and NMR measurements during the evolution of phase separation in solid helium isotopic mixtures. Our observations indicate clearly all three stages of the homogeneous nucleation - growth process: 1) creation of nucleation sites; 2) growth of the new-phase component at these nucleation sites; and 3) coarsening: the dissolution of sub-critical droplets with the consequent further late-stage growth of the super-critical droplets. The time exponent for the coarsening, a = 1/3, is consistent with the conserved order parameter Lifshitz-Slezov evaporation-condensation mechanism.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 18:40:59 GMT" } ]
2009-11-13T00:00:00
[ [ "Poole", "M.", "" ], [ "Saunders", "J.", "" ], [ "Cowan", "B.", "" ] ]
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711.3427
Markus M\"unzenberg
Zhao Wang, Matth\"aus Pietz, Arno F\"orster, Mihail I. Lepsa and Markus M\"unzenberg
Spin dynamics triggered by sub-terahertz magnetic field pulses
12 pages, 4 figures, submitted to J. Appl. Phys, changes made with regard to review process
J. Appl. Phys. 103, 123905 (2008)
10.1063/1.2940734
null
cond-mat.other
null
Current pulses of up to 20 A and as short as 3 ps are generated by a low temperature grown GaAs (lt-GaAs) photoconductive switch and guided through a coplanar waveguide, resulting in a 0.6 Tesla terahertz (THz) magnetic field pulse. The pulse length is directly calibrated using photocurrent autocorrelation. Magnetic excitations in Fe microstructures are studied by time-resolved Kerr spectroscopy and compared with micromagnetic simulations. A response within less than 10 ps to the THz electromagnetic field pulse is found.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 18:38:59 GMT" }, { "version": "v2", "created": "Fri, 11 Apr 2008 16:18:01 GMT" } ]
2008-12-03T00:00:00
[ [ "Wang", "Zhao", "" ], [ "Pietz", "Matthäus", "" ], [ "Förster", "Arno", "" ], [ "Lepsa", "Mihail I.", "" ], [ "Münzenberg", "Markus", "" ] ]
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711.3428
S. Worya Rabiei
M. Mahmoudi, S. Worya Rabiei, L. Ebrahimi Zohravi and M. Sahrai
Absorption free superluminal light propagation in a three level pump-probe system
null
Optics Communications 281 (2008) 4681-4686
10.1016/j.optcom.2008.05.048
null
quant-ph
null
We investigate the dispersion and the absorption properties of a weak probe field in a three-level pump-probe atomic system. It is shown that the slope of dispersion changes from positive to negative just with the intensity of the coherent or indirect incoherent pumping fields. It is demonstrated that the absorption free superluminal light propagation is appeared in this system.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 18:45:47 GMT" } ]
2010-01-20T00:00:00
[ [ "Mahmoudi", "M.", "" ], [ "Rabiei", "S. Worya", "" ], [ "Zohravi", "L. Ebrahimi", "" ], [ "Sahrai", "M.", "" ] ]
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711.3429
Maciej M. Duras
Maciej M. Duras
Quantum anharmonic oscillator and its statistical properties in the first quantization scheme
10 pages
null
null
null
cond-mat.stat-mech
null
A family of quantum anharmonic oscillators is studied in any finite spatial dimension in the scheme of first quantization and the investigation of their eigenenergies is presented. The statistical properties of the calculated eigenenergies are compared with the theoretical predictions inferred from the Random Matrix theory. Conclusions are derived.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 19:55:49 GMT" } ]
2007-11-22T00:00:00
[ [ "Duras", "Maciej M.", "" ] ]
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711.343
Azat Gainutdinov
A. M. Gainutdinov, I. Yu. Tipunin
Radford, Drinfeld, and Cardy boundary states in (1,p) logarithmic conformal field models
32 pages; minor changes, corrected typos
J.Phys.A42:315207,2009
10.1088/1751-8113/42/31/315207
null
hep-th math.QA
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We introduce p-1 pseudocharacters in the space of (1,p) model vacuum torus amplitudes to complete the distinguished basis in the 2p-dimensional fusion algebra to a basis in the whole (3p-1)-dimensional space of torus amplitudes, and the structure constants in this basis are integer numbers. We obtain a generalized Verlinde-formula that gives these structure constants. In the context of theories with boundaries, we identify the space of vacuum torus amplitudes with the space of Ishibashi states. Then, we propose 3p-1 boundary states satisfying the Cardy condition.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 18:50:51 GMT" }, { "version": "v2", "created": "Mon, 16 Feb 2009 22:32:59 GMT" } ]
2009-07-22T00:00:00
[ [ "Gainutdinov", "A. M.", "" ], [ "Tipunin", "I. Yu.", "" ] ]
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711.3431
Damski Bogdan
Bogdan Damski and Wojciech H. Zurek
How to fix a broken symmetry: Quantum dynamics of symmetry restoration in a ferromagnetic Bose-Einstein condensate
15 pages, 11 figures, final version accepted in NJP (slight changes with respect to the former submission)
New J. Phys. 10, 045023 (2008)
10.1088/1367-2630/10/4/045023
LAUR-07-7540
cond-mat.other hep-th quant-ph
null
We discuss the dynamics of a quantum phase transition in a spin-1 Bose-Einstein condensate when it is driven from the magnetized broken-symmetry phase to the unmagnetized ``symmetric'' polar phase. We determine where the condensate goes out of equilibrium as it approaches the critical point, and compute the condensate magnetization at the critical point. This is done within a quantum Kibble-Zurek scheme traditionally employed in the context of symmetry-breaking quantum phase transitions. Then we study the influence of the nonequilibrium dynamics near a critical point on the condensate magnetization. In particular, when the quench stops at the critical point, nonlinear oscillations of magnetization occur. They are characterized by a period and an amplitude that are inversely proportional. If we keep driving the condensate far away from the critical point through the unmagnetized ``symmetric'' polar phase, the amplitude of magnetization oscillations slowly decreases reaching a non-zero asymptotic value. That process is described by the equation that can be mapped onto the classical mechanical problem of a particle moving under the influence of harmonic and ``anti-friction'' forces whose interplay leads to surprisingly simple fixed-amplitude oscillations. We obtain several scaling results relating the condensate magnetization to the quench rate, and verify numerically all analytical predictions.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 18:52:04 GMT" }, { "version": "v2", "created": "Tue, 18 Dec 2007 17:32:15 GMT" }, { "version": "v3", "created": "Thu, 1 May 2008 15:45:23 GMT" } ]
2009-11-13T00:00:00
[ [ "Damski", "Bogdan", "" ], [ "Zurek", "Wojciech H.", "" ] ]
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711.3432
Maciej M. Duras
Maciej M. Duras
Quantum anharmonic oscillator and its statistical properties
6 pages; minor changes
null
null
null
cond-mat.stat-mech
null
In the present article a family of quantum anharmonic oscillators is studied using Hermite's function basis (Fock's basis) in the Hilbert space. The numerical investigation of the eigenenergies of that family is presented. The statistical properties of the calculated eigenvalues are compared with the theoretical predictions derived from the Random Matrix Theory. Conclusions are inferred.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 18:54:35 GMT" }, { "version": "v2", "created": "Fri, 23 Nov 2007 18:43:23 GMT" } ]
2011-11-10T00:00:00
[ [ "Duras", "Maciej M.", "" ] ]
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711.3433
Cristian Lenart
Cedric Lecouvey and Cristian Lenart
On q-analogs of weight multiplicities for the Lie superalgebras gl(n,m) and spo(2n,M)
16 pages, 1 figure
null
null
null
math.RT math.QA
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The paper is devoted to the generalization of Lusztig's q-analog of weight multiplicities to the Lie superalgebras gl(n,m) and spo(2n,M). We define such q-analogs K_{lambda,mu}(q) for the typical modules and for the irreducible covariant tensor gl(n,m)-modules of highest weight lambda. For gl(n,m), the defined polynomials have nonnegative integer coefficients if the weight mu is dominant. For spo(2n,M), we show that the positivity property holds when mu is dominant and sufficiently far from a specific wall of the fundamental chamber. We also establish that the q-analog associated to an irreducible covariant tensor gl(n,m)-module of highest weight lambda and a dominant weight mu is the generating series of a simple statistic on the set of semistandard hook-tableaux of shape lambda and weight mu. This statistic can be regarded as a super analog of the charge statistic defined by Lascoux and Schutzenberger.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 19:11:44 GMT" }, { "version": "v2", "created": "Mon, 23 Jun 2008 18:40:20 GMT" } ]
2008-06-23T00:00:00
[ [ "Lecouvey", "Cedric", "" ], [ "Lenart", "Cristian", "" ] ]
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711.3434
Jianke Yang
Jianke Yang and Taras I. Lakoba
Accelerated Imaginary-time Evolution Methods for the Computation of Solitary Waves
To appear in Stud. Appl. Math. (28 pages, 6 figures)
null
null
null
nlin.PS
null
Two accelerated imaginary-time evolution methods are proposed for the computation of solitary waves in arbitrary spatial dimensions. For the first method (with traditional power normalization), the convergence conditions as well as conditions for optimal accelerations are derived. In addition, it is shown that for nodeless solitary waves, this method converges if and only if the solitary wave is linearly stable. The second method is similar to the first method except that it uses a novel amplitude normalization. The performance of these methods is illustrated on various examples. It is found that while the first method is competitive with the Petviashvili method, the second method delivers much better performance than the first method and the Petviashvili method.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 19:16:30 GMT" } ]
2007-11-22T00:00:00
[ [ "Yang", "Jianke", "" ], [ "Lakoba", "Taras I.", "" ] ]
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711.3435
Martin Jesus Aparicio Alcalde
M. Aparicio Alcalde, G. Menezes and N. F. Svaiter
Quantum Bound on the Specific Entropy in Strong-Coupled Scalar Field Theory
Accepted for publication in Physical Review D
Phys.Rev.D77:125024,2008
10.1103/PhysRevD.77.125024
null
hep-th
null
Using the Euclidean path integral approach with functional methods, we discuss the $(g_{0} \phi^{p})_{d}$ self-interacting scalar field theory, in the strong-coupling regime. We assume the presence of macroscopic boundaries confining the field in a hypercube of side $L$. We also consider that the system is in thermal equilibrium at temperature $\beta^{-1}$. For spatially bounded free fields, the Bekenstein bound states that the specific entropy satisfies the inequality $\frac{S}{E} < 2 \pi R$, where $R$ stands for the radius of the smallest sphere that circumscribes the system. Employing the strong-coupling perturbative expansion, we obtain the renormalized mean energy $E$ and entropy $S$ for the system up to the order $(g_{0})^{-\frac{2}{p}}$, presenting an analytical proof that the specific entropy also satisfies in some situations a quantum bound. Defining $\epsilon_d^{(r)}$ as the renormalized zero-point energy for the free theory per unit length, the dimensionless quantity $\xi=\frac{\beta}{L}$ and $h_1(d)$ and $h_2(d)$ as positive analytic functions of $d$, for the case of high temperature, we get that the specific entropy satisfies $\frac{S}{E} < 2\pi R \frac{h_1(d)}{h_2(d)} \xi$. When considering the low temperature behavior of the specific entropy, we have $\frac{S}{E} <2\pi R \frac{h_1(d)}{\epsilon_d^{(r)}}\xi^{1-d}$. Therefore the sign of the renormalized zero-point energy can invalidate this quantum bound. If the renormalized zero point-energy is a positive quantity, at intermediate temperatures and in the low temperature limit, there is a quantum bound.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 19:19:33 GMT" }, { "version": "v2", "created": "Tue, 3 Jun 2008 18:31:17 GMT" } ]
2008-11-26T00:00:00
[ [ "Alcalde", "M. Aparicio", "" ], [ "Menezes", "G.", "" ], [ "Svaiter", "N. F.", "" ] ]
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711.3436
Jose Ramon Espinosa
G. Ballesteros, J. A. Casas, J. R. Espinosa, R. Ruiz de Austri and R. Trotta
Flat Tree-level Inflationary Potentials in Light of CMB and LSS Data
42 LaTeX pages, 8 figures
JCAP 0803:018,2008
10.1088/1475-7516/2008/03/018
IFT-UAM/CSIC-07-60, CERN-PH-TH/2007-225
hep-ph astro-ph hep-th
null
We use cosmic microwave background and large scale structure data to test a broad and physically well-motivated class of inflationary models: those with flat tree-level potentials (typical in supersymmetry). The non-trivial features of the potential arise from radiative corrections which give a simple logarithmic dependence on the inflaton field, making the models very predictive. We also consider a modified scenario with new physics beyond a certain high-energy cut-off showing up as non-renormalizable operators (NRO) in the inflaton field. We find that both kinds of models fit remarkably well CMB and LSS data, with very few free parameters. Besides, a large part of these models naturally predict a reasonable number of e-folds. A robust feature of these scenarios is the smallness of tensor perturbations (r < 10^{-3}). The NRO case can give a sizeable running of the spectral index while achieving a sufficient number of e-folds. We use Bayesian model comparison tools to assess the relative performance of the models. We believe that these scenarios can be considered as a standard physical class of inflationary models, on a similar footing with monomial potentials.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 19:19:49 GMT" } ]
2009-03-24T00:00:00
[ [ "Ballesteros", "G.", "" ], [ "Casas", "J. A.", "" ], [ "Espinosa", "J. R.", "" ], [ "de Austri", "R. Ruiz", "" ], [ "Trotta", "R.", "" ] ]
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711.3437
Christoph Wockel
Karl-Hermann Neeb, Christoph Wockel
Central extensions of groups of sections
54 pages, revised version, to appear in Ann. Glob. Anal. Geom
Ann. Glob. Anal. Geom. 36 (2009) 381
10.1007/s10455-009-9168-6
null
math.DG math.GR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
If q : P -> M is a principal K-bundle over the compact manifold M, then any invariant symmetric V-valued bilinear form on the Lie algebra k of K defines a Lie algebra extension of the gauge algebra by a space of bundle-valued 1-forms modulo exact forms. In the present paper we analyze the integrability of this extension to a Lie group extension for non-connected, possibly infinite-dimensional Lie groups K. If K has finitely many connected components we give a complete characterization of the integrable extensions. Our results on gauge groups are obtained by specialization of more general results on extensions of Lie groups of smooth sections of Lie group bundles. In this more general context we provide sufficient conditions for integrability in terms of data related only to the group K.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 19:34:03 GMT" }, { "version": "v2", "created": "Wed, 29 Apr 2009 18:13:00 GMT" } ]
2016-09-08T00:00:00
[ [ "Neeb", "Karl-Hermann", "" ], [ "Wockel", "Christoph", "" ] ]
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711.3438
David Kribs
Dennis Kretschmann, David W. Kribs, and Robert W. Spekkens
Complementarity of Private and Correctable Subsystems in Quantum Cryptography and Error Correction
5 pages, 2 figures, preprint version
Phys. Rev. A 78, 032330 (2008)
10.1103/PhysRevA.78.032330
null
quant-ph
null
We make an explicit connection between fundamental notions in quantum cryptography and quantum error correction. Error-correcting subsystems (and subspaces) for quantum channels are the key vehicles for contending with noise in physical implementations of quantum information-processing. Private subsystems (and subspaces) for quantum channels play a central role in cryptographic schemes such as quantum secret sharing and private quantum communication. We show that a subsystem is private for a channel precisely when it is correctable for a complementary channel. This result is shown to hold even for approximate notions of private and correctable defined in terms of the diamond norm for superoperators.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 20:13:20 GMT" } ]
2008-09-29T00:00:00
[ [ "Kretschmann", "Dennis", "" ], [ "Kribs", "David W.", "" ], [ "Spekkens", "Robert W.", "" ] ]
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711.3439
Vincent Boyer
V. Boyer, A. M. Marino, and P. D. Lett
Generation of spatially broadband twin beams for quantum imaging
5 pages, 5 figures
null
10.1103/PhysRevLett.100.143601
null
quant-ph
null
We generate spatially multimode twin beams using 4-wave mixing in a hot atomic vapor in a phase-insensitive traveling-wave amplifier configuration. The far-field coherence area measured at 3.5 MHz is shown to be much smaller than the angular bandwidth of the process and bright twin images with independently quantum-correlated sub-areas can be generated with little distortion. The available transverse degrees of freedom form a high-dimensional Hilbert space which we use to produce quantum-correlated twin beams with finite orbital angular momentum.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 19:42:46 GMT" } ]
2009-11-13T00:00:00
[ [ "Boyer", "V.", "" ], [ "Marino", "A. M.", "" ], [ "Lett", "P. D.", "" ] ]
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711.344
Martin Kassabov
Martin Kassabov and Nikolay Nikolov
Generation of polycyclic groups
9 pages, some small mistakes in the first version have been corrected
null
null
null
math.GR
null
In this note we give an alternative proof of a theorem of Linnell and Warhurst that the number of generators d(G) of a polycyclic group G is at most d(\hat G), where d(\hat G) is the number of generators of the profinite completion of G. While not claiming anything new we believe that our argument is much simpler that the original one. Moreover our result gives some sufficient condition when d(G)=d(\hat G) which can be verified quite easily in the case when G is virtually abelian.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 19:43:00 GMT" }, { "version": "v2", "created": "Thu, 27 Mar 2008 17:23:17 GMT" } ]
2008-03-27T00:00:00
[ [ "Kassabov", "Martin", "" ], [ "Nikolov", "Nikolay", "" ] ]
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711.3441
Pablo Gustavo Albuquerque Braz e Silva
P. Braz e Silva, L.C.F. Ferreira, E.J. Villamizar-Roa
On the existence of infinite energy solutions for nonlinear Schrodinger equations
11 pages
null
null
null
math.AP
null
We derive new results about existence and uniqueness of local and global solutions for nonlinear Schrodinger equation, including self-similar global solutions. Our analysis is performed in the framework of Marcinkiewicz spaces.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 19:46:15 GMT" } ]
2007-11-22T00:00:00
[ [ "Silva", "P. Braz e", "" ], [ "Ferreira", "L. C. F.", "" ], [ "Villamizar-Roa", "E. J.", "" ] ]
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711.3442
Yuki Watanabe
Yuki Watanabe, Eiichiro Komatsu (U. Texas, Austin)
Gravitational inflaton decay and the hierarchy problem
6 pages, submitted to PRD, (v2) references added, (v3) revised to have inflaton quanta canonically normalized
Phys.Rev.D77:043514,2008
10.1103/PhysRevD.77.043514
null
hep-th astro-ph gr-qc hep-ph
null
We study implications of the large-N species solution to the hierarchy problem, proposed by G. Dvali, for reheating of the universe after inflation. Dvali's proposal contains additional N~10^{32} Z_2-conserved quantum fields beyond the Standard Model particles with mass ~1 TeV, which weaken gravity by a factor of 1/N, and thus explain the hierarchy between the Plank scale and the electroweak scale. We show that, in this scenario, the decay rates of inflaton fields through gravitational decay channels are enhanced by a factor of N, and thus they decay into N species of the quantum fields very efficiently, in the limit that quantum gravity effects are unimportant for the gravitational decay rate. In order not to over-reheat the universe, inflaton mass, vacuum expectation value of inflaton, or non-minimal gravitational coupling should be tightly fine-tuned. Our conclusion holds even when the gravitational decay is prohibited by some symmetry of the theory; the universe may still be over-reheated via annihilation of inflatons, if the number density of inflaton quanta is greater than the critical value.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 20:40:01 GMT" }, { "version": "v2", "created": "Sun, 2 Dec 2007 20:58:43 GMT" }, { "version": "v3", "created": "Wed, 16 Apr 2008 22:33:11 GMT" } ]
2008-11-26T00:00:00
[ [ "Watanabe", "Yuki", "", "U. Texas, Austin" ], [ "Komatsu", "Eiichiro", "", "U. Texas, Austin" ] ]
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711.3443
D. Protopopescu
J.C. McGeorge, J.D. Kellie, J.R.M. Annand, J. Ahrens, I. Anthony, A. Clarkson, E.F. McNicoll, P.S. Lumsden, A. Thomas, R.O. Owens, G. Rosner
Upgrade of the Glasgow photon tagging spectrometer for Mainz MAMI-C
20 pages, 12 figures
Eur.Phys.J.A37:129-137,2008
10.1140/epja/i2007-10606-0
null
nucl-ex
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The Glasgow photon tagging spectrometer at Mainz has been upgraded so that it can be used with the 1500 MeV electron beam now available from the Mainz microtron MAMI-C. The changes made and the resulting properties of the spectrometer are discussed.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 19:53:21 GMT" }, { "version": "v2", "created": "Thu, 22 Nov 2007 13:48:04 GMT" }, { "version": "v3", "created": "Tue, 7 Oct 2008 14:38:06 GMT" } ]
2008-11-26T00:00:00
[ [ "McGeorge", "J. C.", "" ], [ "Kellie", "J. D.", "" ], [ "Annand", "J. R. M.", "" ], [ "Ahrens", "J.", "" ], [ "Anthony", "I.", "" ], [ "Clarkson", "A.", "" ], [ "McNicoll", "E. F.", "" ], [ "Lumsden", "P. S.", "" ], [ "Thomas", "A.", "" ], [ "Owens", "R. O.", "" ], [ "Rosner", "G.", "" ] ]
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711.3444
Hendrik van Hees
Hendrik van Hees and Ralf Rapp
Dilepton Radiation at the CERN Super Proton Synchrotron
29 pages, 22 figures; v2: comments added in Sec. III, reference corrected; v3: version accepted for publication in Nucl. Phys. A
Nucl.Phys.A806:339-387,2008
10.1016/j.nuclphysa.2008.03.009
null
hep-ph nucl-ex nucl-th
null
A quantitative evaluation of dilepton sources in heavy-ion reactions is performed taking into account both thermal and non-thermal production mechanisms. The hadronic thermal emission rate is based on an electromagnetic current-correlation function with a low-mass region (LMR, M \lsim 1 GeV) dominated by vector mesons (\rho, \omega, \phi) and an intermediate-mass region (IMR, 1 GeV \le M \le 3 GeV) characterized by (the onset of) a multi-meson continuum. A convolution of the emission rates over a thermal fireball expansion results in good agreement with experiment in the low-mass spectra, confirming the predicted broadening of the \rho meson in hadronic matter in connection with the prevalence of baryon-induced medium effects. The absolute magnitude of the LMR excess is mostly controlled by the fireball lifetime, which in turn leads to a consistent explanation of the dilepton excess in the IMR in terms of thermal radiation. The analysis of experimental transverse-momentum (q_T) spectra reveals discrepancies with thermal emission for q_T \gsim 1 GeV in noncentral In-In collisions, which we address by extending our calculations by: (i) a refined treatment of \rho decays at thermal freezeout, (ii) primordially produced \rho's subject to energy-loss, (iii) Drell-Yan annihilation, and (iv) thermal radiation from t-channel meson exchange processes. We investigate the sensitivity of dilepton spectra to the critical temperature and hadro-chemical freezeout of the fireball. The \rho broadening in the LMR turns out to be robust, while in the IMR Quark-Gluon Plasma radiation is moderate unless the critical temperature is rather low.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 19:57:31 GMT" }, { "version": "v2", "created": "Wed, 12 Dec 2007 19:59:34 GMT" }, { "version": "v3", "created": "Mon, 14 Apr 2008 15:45:25 GMT" } ]
2011-02-15T00:00:00
[ [ "van Hees", "Hendrik", "" ], [ "Rapp", "Ralf", "" ] ]
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711.3445
Timo Aspelmeier
T. Aspelmeier, A. Billoire, E. Marinari and M.A. Moore
Finite size corrections in the Sherrington-Kirkpatrick model
Contribution to the conference "Viewing the World through Spin Glasses" in honour of Professor David Sherrington on the occasion of his 65th birthday, 31 August - 1 September 2007
J. Phys. A: Math. Theor. 41 (2008) 324008
10.1088/1751-8113/41/32/324008
null
cond-mat.dis-nn
null
We argue that when the number of spins $N$ in the SK model is finite, the Parisi scheme can be terminated after $K$ replica-symmetry breaking steps, where $K(N) \propto N^{1/6}$. We have checked this idea by Monte Carlo simulations: we expect the typical number of peaks and features $R$ in the (non-bond averaged) Parisi overlap function $P_J(q)$ to be of order $2K(N)$, and our counting (for samples of size $N$ up to 4096 spins) gives results which are consistent with our arguments. We can estimate the leading finite size correction for any thermodynamic quantity by finding its $K$ dependence in the Parisi scheme and then replacing $K$ by K(N). Our predictions of how the Edwards-Anderson order parameter and the internal energy of the system approach their thermodynamic limit compare well with the results of our Monte Carlo simulations. The $N$-dependence of the sample-to-sample fluctuations of thermodynamic quantities can also be obtained; the total internal energy should have sample-to-sample fluctuations of order $N^{1/6}$, which is again consistent with the results of our numerical simulations.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 20:19:12 GMT" } ]
2009-11-13T00:00:00
[ [ "Aspelmeier", "T.", "" ], [ "Billoire", "A.", "" ], [ "Marinari", "E.", "" ], [ "Moore", "M. A.", "" ] ]
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711.3446
Kasper Peeters
Kasper Peeters and Marija Zamaklar
Dissociation by acceleration
6 pages, 3 figures
JHEP 0801:038,2008
10.1088/1126-6708/2008/01/038
ITP-UU-07/59, SPIN-07/45, DCPT-07/63
hep-th hep-ph nucl-th
null
We show that mesons, described using rotating relativistic strings in a holographic setup, undergo dissociation when their acceleration 'a' exceeds a value which scales with the angular momentum 'J' as a_max ~ \sqrt{T_s/J}, where 'T_s' is the string tension.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 20:26:55 GMT" } ]
2009-01-06T00:00:00
[ [ "Peeters", "Kasper", "" ], [ "Zamaklar", "Marija", "" ] ]
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711.3447
Aaron Wangberg
Aaron Wangberg
The Structure of E6
Ph. D. Dissertation. 204 pages, 37 figures; v2: fixed typos, restructured latex, added figures
null
null
null
math.RA math-ph math.MP
null
We present the subalgebra structure of sl(3,O), a particular real form of E6 chosen for its relevance to particle physics through the connection between its associated Lie group SL(3,O) and generalized Lorentz groups. Given the complications related to the non-associativity of the octonions O and the restriction to working with a real form of E6, we find that the traditional methods used to study Lie algebras must be modified for our purposes. We use an explicit representation of the Lie group SL(3,O) to produce the multiplication table of the corresponding algebra sl(3,O). Both the multiplication table and the group are then utilized to find subalgebras of sl(3,O). In particular, we identify various subalgebras of the form sl(n, F) and su(n, F) within sl(3,O) and we also find algebras corresponding to generalized Lorentz groups. Methods based upon automorphisms of complex Lie algebras are developed to find less obvious subalgebras of sl(3,O). While we focus on the subalgebra structure of our real form of E6, these methods may also be used to study the subalgebra structure of any other real form of E6. A maximal set of simultaneously measurable observables in physics corresponds to a maximal set of Casimir operators in the Lie algebra. We not only identify six Casimir operators in E6, but produce a nested sequence of subalgebras and Casimir operators in E6 containing both su(3)+su(2)+u(1) corresponding to the Standard Model and the Lorentz group of special relativity.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 20:13:48 GMT" }, { "version": "v2", "created": "Thu, 20 Dec 2007 23:54:47 GMT" } ]
2007-12-21T00:00:00
[ [ "Wangberg", "Aaron", "" ] ]
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711.3448
Joel Shapiro
Joel A. Shapiro
Reminiscence on the Birth of String Theory
Invited Contribution to "The Birth of String Theory" Commemorative Volume. 12 pages, 2 figures. Minor content revision
null
null
null
hep-th
null
These are my personal impressions of the environment in which string theory was born, and what the important developments affecting my work were during the hadronic string era, 1968-1974. I discuss my motivations and concerns at the time, particularly in my work on loop amplitudes and on closed strings.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 20:57:45 GMT" }, { "version": "v2", "created": "Wed, 19 Dec 2007 18:15:56 GMT" } ]
2007-12-19T00:00:00
[ [ "Shapiro", "Joel A.", "" ] ]
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711.3449
Eric Laporte
Eric Laporte (IGM-LabInfo)
Lexicon management and standard formats
null
Archives of Control Sciences 15, 3 (2005) 329-340
null
null
cs.CL
null
International standards for lexicon formats are in preparation. To a certain extent, the proposed formats converge with prior results of standardization projects. However, their adequacy for (i) lexicon management and (ii) lexicon-driven applications have been little debated in the past, nor are they as a part of the present standardization effort. We examine these issues. IGM has developed XML formats compatible with the emerging international standards, and we report experimental results on large-coverage lexica.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 20:34:08 GMT" } ]
2007-11-22T00:00:00
[ [ "Laporte", "Eric", "", "IGM-LabInfo" ] ]
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711.345
Passemar Emilie
Veronique Bernard, Emilie Passemar
Matching Chiral Perturbation Theory and the Dispersive Representation of the Scalar Kpi Form Factor
13 pages, 1 figure, typos corrected, discussion slightly extended, accepted for publication in Phys. Lett. B
Phys.Lett.B661:95-102,2008
10.1016/j.physletb.2008.02.004
null
hep-ph hep-ex hep-lat nucl-ex nucl-th
null
We perform a matching of the two loop-chiral perturbation theory representation of the scalar Kpi form factor to a dispersive one. Knowing the value of F_K/F_pi and f_+(0) in the Standard Model (SM) allows to determine two O(p^6) LECs, the slope of the scalar form factor and the deviation of the Callan-Treiman theorem. Going beyond the SM and assuming the knowledge of the slope of the scalar form factor from experiment, the matching allows us to determine the ratio of F_K/F_pi, f_+(0), a certain combination of non-standard couplings, the deviation of the Callan-Treiman theorem and the two O(p^6) LECs.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 20:54:45 GMT" }, { "version": "v2", "created": "Thu, 13 Mar 2008 10:24:19 GMT" } ]
2008-11-26T00:00:00
[ [ "Bernard", "Veronique", "" ], [ "Passemar", "Emilie", "" ] ]
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711.3451
Oleksandra Beznosova V
Oleksandra V. Beznosova
Linear bound for the dyadic paraproduct on weighted Lebesgue space $L_2(w)$
13 pages
Journal of Functional Analysis, 255(no.4):994-1007, 2008
10.1016/j.jfa.2008.04.025
null
math.FA
null
The dyadic paraproduct is bounded in weighted Lebesgue spaces $L_p(w)$ if and only if the weight $w$ belongs to the Muckenhoupt class $A_p^d$. However, the sharp bounds on the norm of the dyadic paraproduct are not known even in the simplest $L_2(w)$ case. In this paper we prove the linear bound on the norm of the dyadic paraproduct in the weighted Lebesgue space $L_2(w)$ using Bellman function techniques and extrapolate this result to the $L_p(w)$ case.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 20:37:32 GMT" } ]
2012-12-19T00:00:00
[ [ "Beznosova", "Oleksandra V.", "" ] ]
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711.3452
Eric Laporte
Eric Laporte (IGM-LabInfo)
In memoriam Maurice Gross
8 pages
Archives of Control Sciences 15, 3 (2005) 257-278
null
null
cs.CL
null
Maurice Gross (1934-2001) was both a great linguist and a pioneer in natural language processing. This article is written in homage to his memory
[ { "version": "v1", "created": "Wed, 21 Nov 2007 20:38:29 GMT" } ]
2007-11-22T00:00:00
[ [ "Laporte", "Eric", "", "IGM-LabInfo" ] ]
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711.3453
Eric Laporte
Hyun-Gue Huh (IGM-LabInfo), Eric Laporte (IGM-LabInfo)
A resource-based Korean morphological annotation system
6 pages
Dans Proceedings of the International Joint Conference on Natural Language Processing (IJCNLP) - A resource-based Korean morphological annotation system, Jeju : Cor\'ee, R\'epublique de (2005)
null
null
cs.CL
null
We describe a resource-based method of morphological annotation of written Korean text. Korean is an agglutinative language. The output of our system is a graph of morphemes annotated with accurate linguistic information. The language resources used by the system can be easily updated, which allows us-ers to control the evolution of the per-formances of the system. We show that morphological annotation of Korean text can be performed directly with a lexicon of words and without morpho-logical rules.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 20:41:59 GMT" } ]
2007-11-22T00:00:00
[ [ "Huh", "Hyun-Gue", "", "IGM-LabInfo" ], [ "Laporte", "Eric", "", "IGM-LabInfo" ] ]
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711.3454
Eric Laporte
Eric Laporte (IGM-LabInfo), S\'ebastien Paumier (IGM-LabInfo)
Graphes param\'etr\'es et outils de lexicalisation
null
Dans Verbum ex machina. Proceedings of TALN - Graphes param\'etr\'es et outils de lexicalisation, Louvain : Belgique (2006)
null
null
cs.CL
null
Shifting to a lexicalized grammar reduces the number of parsing errors and improves application results. However, such an operation affects a syntactic parser in all its aspects. One of our research objectives is to design a realistic model for grammar lexicalization. We carried out experiments for which we used a grammar with a very simple content and formalism, and a very informative syntactic lexicon, the lexicon-grammar of French elaborated by the LADL. Lexicalization was performed by applying the parameterized-graph approach. Our results tend to show that most information in the lexicon-grammar can be transferred into a grammar and exploited successfully for the syntactic parsing of sentences.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 20:44:04 GMT" } ]
2007-11-22T00:00:00
[ [ "Laporte", "Eric", "", "IGM-LabInfo" ], [ "Paumier", "Sébastien", "", "IGM-LabInfo" ] ]
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711.3455
Geraldine Bourda
Geraldine Bourda (LAB), Patrick Charlot (LAB), Richard Porcas, Simon Garrington
VLBI observations of weak extragalactic radio sources for the alignment of the future GAIA frame with the ICRF
null
Dans Proceedings IAU Symposium No. 248, 2008 - A Giant Step: from Milli- to Micro-arcsecond Astrometry, Shangai : Chine (2007)
10.1017/S1743921308019467
null
astro-ph
null
The space astrometry mission GAIA will construct a dense optical QSO-based celestial reference frame. For consistency between the optical and radio positions, it will be important to align the GAIA frame and the International Celestial Reference Frame (ICRF) with the highest accuracy. Currently, it is found that only 10% of the ICRF sources are suitable to establish this link, either because they are not bright enough at optical wavelengths or because they have significant extended radio emission which precludes reaching the highest astrometric accuracy. In order to improve the situation, we have initiated a VLBI survey dedicated to finding additional high-quality radio sources for aligning the two frames. The sample consists of about 450 sources, typically 20 times weaker than the current ICRF sources, which have been selected by cross-correlating optical and radio catalogues. This paper presents the observing strategy and includes preliminary results of observation of 224 of these sources with the European VLBI Network in June 2007.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 20:46:06 GMT" } ]
2009-11-13T00:00:00
[ [ "Bourda", "Geraldine", "", "LAB" ], [ "Charlot", "Patrick", "", "LAB" ], [ "Porcas", "Richard", "" ], [ "Garrington", "Simon", "" ] ]
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711.3456
Eugene Shakhnovich
Muyoung Heo, Konstantin B. Zeldovich, Eugene I. Shakhnovich
Emergence of clonal selection and affinity maturation in an ab initio microscopic model of immunity
null
null
null
null
q-bio.BM q-bio.PE
null
Mechanisms of immunity, and of the host-pathogen interactions in general are among the most fundamental problems of medicine, ecology, and evolution studies. Here, we present a microscopic, protein-level, sequence-based model of immune system, with explicitly defined interactions between host and pathogen proteins.. Simulations of this model show that possible outcomes of the infection (extinction of cells, survival with complete elimination of viruses, or chronic infection with continuous coexistence of cells and viruses) crucially depend on mutation rates of the viral and immunoglobulin proteins. Infection is always lethal if the virus mutation rate exceeds a certain threshold. Potent immunoglobulins are discovered in this model via clonal selection and affinity maturation. Surviving cells acquire lasting immunity against subsequent infection by the same virus strain. As a second line of defense cells develop apoptosis-like behavior by reducing their lifetimes to eliminate viruses. These results demonstrate the feasibility of microscopic sequence-based models of immune system, where population dynamics of the evolving B-cells is explicitly tied to the molecular properties of their proteins.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 20:46:58 GMT" } ]
2007-11-22T00:00:00
[ [ "Heo", "Muyoung", "" ], [ "Zeldovich", "Konstantin B.", "" ], [ "Shakhnovich", "Eugene I.", "" ] ]
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711.3457
Eric Laporte
Eric Laporte (IGM-LabInfo)
Evaluation of a Grammar of French Determiners
10 pages
Dans Annals of the 27th Congress of the Brazilian Society of Computation - Evaluation of a Grammar of French Determiners, Rio de Janeiro : Br\'esil (2007)
null
null
cs.CL
null
Existing syntactic grammars of natural languages, even with a far from complete coverage, are complex objects. Assessments of the quality of parts of such grammars are useful for the validation of their construction. We evaluated the quality of a grammar of French determiners that takes the form of a recursive transition network. The result of the application of this local grammar gives deeper syntactic information than chunking or information available in treebanks. We performed the evaluation by comparison with a corpus independently annotated with information on determiners. We obtained 86% precision and 92% recall on text not tagged for parts of speech.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 20:49:21 GMT" } ]
2007-11-22T00:00:00
[ [ "Laporte", "Eric", "", "IGM-LabInfo" ] ]
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711.3458
Patrick Dufour
P. Dufour, J. Liebert, G. Fontaine, N. Behara
Hot DQ White Dwarf Stars: A New Challenge to Stellar Evolution
To appear in proceedings of "Hydrogen-Deficient Stars" conference, held in Tuebingen, Germany, Sept. 17-21, 2007. 4 pages, 1 figure
null
null
null
astro-ph
null
We report the discovery of a new class of hydrogen-deficient stars: white dwarfs with an atmosphere primarily composed of carbon, with little or no trace of hydrogen or helium. Our analysis shows that the atmospheric parameters found for these stars do not fit satisfactorily in any of the currently known theories of post-asymptotic giant branch (AGB) evolution, although these objects might be the cooler counter-part of the unique and extensively studied PG 1159 star H1504+65. These stars, together with H1504+65, might thus form a new evolutionary post-AGB sequence.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 20:49:44 GMT" } ]
2007-11-22T00:00:00
[ [ "Dufour", "P.", "" ], [ "Liebert", "J.", "" ], [ "Fontaine", "G.", "" ], [ "Behara", "N.", "" ] ]
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711.3459
Robert R. Caldwell
R. R. Caldwell and A. Stebbins
A Test of the Copernican Principle
4 pages, 3 figures
Phys.Rev.Lett.100:191302,2008
10.1103/PhysRevLett.100.191302
null
astro-ph
null
The blackbody nature of the cosmic microwave background (CMB) radiation spectrum is used in a modern test of the Copernican Principle. The reionized universe serves as a mirror to reflect CMB photons, thereby permitting a view of ourselves and the local gravitational potential. By comparing with measurements of the CMB spectrum, a limit is placed on the possibility that we occupy a privileged location, residing at the center of a large void. The Hubble diagram inferred from lines-of-sight originating at the center of the void may be misinterpreted to indicate cosmic acceleration. Current limits on spectral distortions are shown to exclude the largest voids which mimic cosmic acceleration. More sensitive measurements of the CMB spectrum could prove the existence of such a void or confirm the validity of the Copernican Principle.
[ { "version": "v1", "created": "Thu, 22 Nov 2007 22:40:22 GMT" } ]
2009-06-23T00:00:00
[ [ "Caldwell", "R. R.", "" ], [ "Stebbins", "A.", "" ] ]
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711.346
Cenke Xu
Cenke Xu and Subir Sachdev
A square lattice algebraic spin liquid with SO(5) symmetry
4 pages, 4 figures
Phys. Rev. Lett. 100, 137201 (2008)
10.1103/PhysRevLett.100.137201
null
cond-mat.str-el
null
We propose a critical spin liquid ground state for S=1/2 antiferromagnets on the square lattice. In a renormalization group analysis of the `staggered flux' algebraic spin liquid, we examine perturbations, present in the antiferromagnet, which break its global SU(4) symmetry to SO(5). At physical parameter values, we find an instability towards a fixed point with SO(5) symmetry. We discuss the possibility that this fixed point describes a transition between the Neel and valence bond solid states, and the relationship to the SO(5) non-linear sigma model of Tanaka and Hu.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 21:05:27 GMT" }, { "version": "v2", "created": "Sat, 24 Nov 2007 08:43:53 GMT" } ]
2009-11-13T00:00:00
[ [ "Xu", "Cenke", "" ], [ "Sachdev", "Subir", "" ] ]
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711.3461
Matthew Truch
E. L. Chapin, P. A. R. Ade, J. J. Bock, C. Brunt, M. J. Devlin, S. Dicker, M. Griffin, J. O. Gundersen, M. Halpern, P. C. Hargrave, D. H. Hughes, J. Klein, G. Marsden, P. G. Martin, P. Mauskopf, C. B. Netterfield, L. Olmi, E. Pascale, G. Patanchon, M. Rex, D. Scott, C. Semisch, M. D. P. Truch, C. Tucker, G. S. Tucker, M. P. Viero, D. V. Wiebe
The Balloon-borne Large Aperture Submillimeter Telescope (BLAST) 2005: A 4 sq. deg Galactic Plane Survey in Vulpecula (l=59)
42 Pages, 20 figures; Accepted for publication in the Astrophysical Journal; maps and related results available at http://blastexperiment.info/
Astrophys.J.681:428-452,2008
10.1086/588544
null
astro-ph
null
We present the first results from a new 250, 350, and 500 micron Galactic Plane survey taken with the Balloon-borne Large-Aperture Submillimeter Telescope (BLAST) in 2005. This survey's primary goal is to identify and characterize high-mass proto-stellar objects (HMPOs). The region studied here covers 4 sq. deg near the open cluster NGC 6823 in the constellation Vulpecula (l=59). We find 60 compact sources (<60'' diameter) detected simultaneously in all three bands. Their spectral energy distributions (SEDs) are constrained through BLAST, IRAS, Spitzer MIPS, and MSX photometry, with inferred dust temperatures spanning ~12-40K assuming a dust emissivity index beta=1.5. The luminosity-to-mass ratio, a distance-independent quantity, spans ~0.2-130 L_\odot M_\odot^{-1}. Distances are estimated from coincident 13CO (1->0) velocities combined with a variety of other velocity and morphological data in the literature. In total, 49 sources are associated with a molecular cloud complex encompassing NGC 6823 (distance ~2.3kpc), 10 objects with the Perseus Arm (~8.5kpc) and one object is probably in the outer Galaxy (~14kpc). Near NGC 6823, the inferred luminosities and masses of BLAST sources span ~40-10^4 L_\odot, and ~15-700 M_\odot, respectively. The mass spectrum is compatible with molecular gas masses in other high-mass star forming regions. Several luminous sources appear to be Ultra Compact HII regions powered by early B stars. However, many of the objects are cool, massive gravitationally-bound clumps with no obvious internal radiation from a protostar, and hence excellent HMPO candidates.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 21:47:16 GMT" } ]
2010-01-07T00:00:00
[ [ "Chapin", "E. L.", "" ], [ "Ade", "P. A. R.", "" ], [ "Bock", "J. J.", "" ], [ "Brunt", "C.", "" ], [ "Devlin", "M. J.", "" ], [ "Dicker", "S.", "" ], [ "Griffin", "M.", "" ], [ "Gundersen", "J. O.", "" ], [ "Halpern", "M.", "" ], [ "Hargrave", "P. C.", "" ], [ "Hughes", "D. H.", "" ], [ "Klein", "J.", "" ], [ "Marsden", "G.", "" ], [ "Martin", "P. G.", "" ], [ "Mauskopf", "P.", "" ], [ "Netterfield", "C. B.", "" ], [ "Olmi", "L.", "" ], [ "Pascale", "E.", "" ], [ "Patanchon", "G.", "" ], [ "Rex", "M.", "" ], [ "Scott", "D.", "" ], [ "Semisch", "C.", "" ], [ "Truch", "M. D. P.", "" ], [ "Tucker", "C.", "" ], [ "Tucker", "G. S.", "" ], [ "Viero", "M. P.", "" ], [ "Wiebe", "D. V.", "" ] ]
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711.3462
Matthew Truch
G. Patanchon, P. A. R. Ade, J. J. Bock, E. L. Chapin, M. J. Devlin, S. Dicker, M. Griffin, J. O. Gundersen, M. Halpern, P. C. Hargrave, D. H. Hughes, J. Klein, G. Marsden, P. G. Martin, P. Mauskopf, C. B. Netterfield, L. Olmi, E. Pascale, M. Rex, D. Scott, C. Semisch, M. D. P. Truch, C. Tucker, G. S. Tucker, M. P. Viero, D. V. Wiebe
SANEPIC: A Map-Making Method for Timestream Data From Large Arrays
27 Pages, 15 figures; Submitted to the Astrophysical Journal; related results available at http://blastexperiment.info/ [the BLAST Webpage]
Astrophys.J. 681 (2008) 708-725
10.1086/588543
null
astro-ph
null
We describe a map-making method which we have developed for the Balloon-borne Large Aperture Submillimeter Telescope (BLAST) experiment, but which should have general application to data from other submillimeter arrays. Our method uses a Maximum Likelihood based approach, with several approximations, which allows images to be constructed using large amounts of data with fairly modest computer memory and processing requirements. This new approach, Signal And Noise Estimation Procedure Including Correlations (SANEPIC), builds upon several previous methods, but focuses specifically on the regime where there is a large number of detectors sampling the same map of the sky, and explicitly allowing for the the possibility of strong correlations between the detector timestreams. We provide real and simulated examples of how well this method performs compared with more simplistic map-makers based on filtering. We discuss two separate implementations of SANEPIC: a brute-force approach, in which the inverse pixel-pixel covariance matrix is computed; and an iterative approach, which is much more efficient for large maps. SANEPIC has been successfully used to produce maps using data from the 2005 BLAST flight.
[ { "version": "v1", "created": "Fri, 23 Nov 2007 17:23:19 GMT" } ]
2008-07-03T00:00:00
[ [ "Patanchon", "G.", "" ], [ "Ade", "P. A. R.", "" ], [ "Bock", "J. J.", "" ], [ "Chapin", "E. L.", "" ], [ "Devlin", "M. J.", "" ], [ "Dicker", "S.", "" ], [ "Griffin", "M.", "" ], [ "Gundersen", "J. O.", "" ], [ "Halpern", "M.", "" ], [ "Hargrave", "P. C.", "" ], [ "Hughes", "D. H.", "" ], [ "Klein", "J.", "" ], [ "Marsden", "G.", "" ], [ "Martin", "P. G.", "" ], [ "Mauskopf", "P.", "" ], [ "Netterfield", "C. B.", "" ], [ "Olmi", "L.", "" ], [ "Pascale", "E.", "" ], [ "Rex", "M.", "" ], [ "Scott", "D.", "" ], [ "Semisch", "C.", "" ], [ "Truch", "M. D. P.", "" ], [ "Tucker", "C.", "" ], [ "Tucker", "G. S.", "" ], [ "Viero", "M. P.", "" ], [ "Wiebe", "D. V.", "" ] ]
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711.3463
Avi Loeb
Abraham Loeb (Harvard)
The Frontier of Reionization: Theory and Forthcoming Observations
26 pages, 16 figures, Opening lecture for "Astrophysics In the Next Decade", http://www.stsci.edu/institute/conference/jwst2007/agenda
null
null
null
astro-ph hep-ph
null
The cosmic microwave background provides an image of the Universe 0.4 million years after the big bang, when atomic hydrogen formed out of free electrons and protons. One of the primary goals of observational cosmology is to obtain follow-up images of the Universe during the epoch of reionization, hundreds of millions of years later, when cosmic hydrogen was ionized once again by the UV photons emitted from the first galaxies. To achieve this goal, new observatories are being constructed, including low-frequency radio arrays capable of mapping cosmic hydrogen through its redshifted 21cm emission, as well as imagers of the first galaxies such as the James Webb Space Telescope (JWST) and large aperture ground-based telescopes. The construction of these observatories is being motivated by a rapidly growing body of theoretical work. Numerical simulations of reionization are starting to achieve the dynamical range required to resolve galactic sources across the scale of hundreds of comoving Mpc, larger than the biggest ionized regions.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 21:43:07 GMT" } ]
2007-11-27T00:00:00
[ [ "Loeb", "Abraham", "", "Harvard" ] ]
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711.3464
Axel Boldt
Axel Boldt, Ahmad Mojiri
On Uniserial Modules in the Auslander-Reiten Quiver
28 pages; to be published in Journal of Algebra
null
null
null
math.RT math.RA
null
This article begins the study of irreducible maps involving finite-dimensional uniserial modules over finite-dimensional associative algebras. We work on the classification of irreducible maps between two uniserials over triangular algebras, and give estimates for the number of middle terms of an almost split sequence with a uniserial end term.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 21:10:51 GMT" } ]
2007-11-26T00:00:00
[ [ "Boldt", "Axel", "" ], [ "Mojiri", "Ahmad", "" ] ]
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711.3465
Matthew Truch
E. Pascale, P. A. R. Ade, J. J. Bock, E. L. Chapin, J. Chung, M. J. Devlin, S Dicker, M. Griffin, J. O. Gundersen, M. Halpern, P. C. Hargrave, D. H. Hughes, J. Klein, C. J. MacTavish, G. Marsden, P. G. Martin, T. G. Martin, P. Mauskopf, C. B. Netterfield, L. Olmi, G. Patanchon, M. Rex, D. Scott, C. Semisch, N. Thomas, M. D. P. Truch, C. Tucker, G. S. Tucker, M. P. Viero, D. V. Wiebe
The Balloon-borne Large Aperture Submillimeter Telescope: BLAST
38 Pages, 11 figures; Replaced with version accepted for publication in the Astrophysical Journal; related results available at http://blastexperiment.info/
Astrophys.J. 681 (2008) 400-414
10.1086/588541
null
astro-ph
null
The Balloon-borne Large Aperture Submillimeter Telescope (BLAST) is a sub-orbital surveying experiment designed to study the evolutionary history and processes of star formation in local galaxies (including the Milky Way) and galaxies at cosmological distances. The BLAST continuum camera, which consists of 270 detectors distributed between 3 arrays, observes simultaneously in broad-band (30%) spectral-windows at 250, 350, and 500 microns. The optical design is based on a 2m diameter telescope, providing a diffraction-limited resolution of 30" at 250 microns. The gondola pointing system enables raster mapping of arbitrary geometry, with a repeatable positional accuracy of ~30"; post-flight pointing reconstruction to ~5" rms is achieved. The on-board telescope control software permits autonomous execution of a pre-selected set of maps, with the option of manual override. In this paper we describe the primary characteristics and measured in-flight performance of BLAST. BLAST performed a test-flight in 2003 and has since made two scientifically productive long-duration balloon flights: a 100-hour flight from ESRANGE (Kiruna), Sweden to Victoria Island, northern Canada in June 2005; and a 250-hour, circumpolar-flight from McMurdo Station, Antarctica, in December 2006.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 21:48:55 GMT" }, { "version": "v2", "created": "Thu, 27 Mar 2008 16:18:39 GMT" } ]
2008-07-03T00:00:00
[ [ "Pascale", "E.", "" ], [ "Ade", "P. A. R.", "" ], [ "Bock", "J. J.", "" ], [ "Chapin", "E. L.", "" ], [ "Chung", "J.", "" ], [ "Devlin", "M. J.", "" ], [ "Dicker", "S", "" ], [ "Griffin", "M.", "" ], [ "Gundersen", "J. O.", "" ], [ "Halpern", "M.", "" ], [ "Hargrave", "P. C.", "" ], [ "Hughes", "D. H.", "" ], [ "Klein", "J.", "" ], [ "MacTavish", "C. J.", "" ], [ "Marsden", "G.", "" ], [ "Martin", "P. G.", "" ], [ "Martin", "T. G.", "" ], [ "Mauskopf", "P.", "" ], [ "Netterfield", "C. B.", "" ], [ "Olmi", "L.", "" ], [ "Patanchon", "G.", "" ], [ "Rex", "M.", "" ], [ "Scott", "D.", "" ], [ "Semisch", "C.", "" ], [ "Thomas", "N.", "" ], [ "Truch", "M. D. P.", "" ], [ "Tucker", "C.", "" ], [ "Tucker", "G. S.", "" ], [ "Viero", "M. P.", "" ], [ "Wiebe", "D. V.", "" ] ]
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711.3466
Anders Niklasson
Anders M. N. Niklasson
Extended Lagrangian formulation of time-reversible Born-Oppenheimer molecular dynamics for higher-order symplectic integration
4 pages, 1 figure
null
null
LA-UR 07-7769
cond-mat.mtrl-sci
null
A Lagrangian generalization of time-reversible Born-Oppenheimer molecular dynamics [Niklasson et al., Phys. Rev. Lett. vol. 97, 123001 (2006)] is proposed. The Lagrangian includes extended electronic degrees of freedom as auxiliary dynamical variables in addition to the nuclear coordinates and momenta. While the nuclear degrees of freedom propagate on the Born-Oppenheimer potential energy surface, the extended auxiliary electronic degrees of freedom evolve as a harmonic oscillator centered around the adiabatic propagation of the self-consistent ground state. The formulation enables the application of higher-order symplectic or geometric integration schemes that are stable and energy conserving even under incomplete self-consistency convergence. It is demonstrated how the extended Born-Oppenheimer molecular dynamics improves the accuracy by over an order of magnitude compared to previous formulations at the same level of computational cost.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 21:14:49 GMT" }, { "version": "v2", "created": "Fri, 7 Mar 2008 22:44:16 GMT" } ]
2008-03-08T00:00:00
[ [ "Niklasson", "Anders M. N.", "" ] ]
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711.3467
Michael Hilke
M. Hilke
Ensemble Averaged Conductance Fluctuations in Anderson Localized Systems
4 pages
null
10.1103/PhysRevB.78.012204
null
cond-mat.dis-nn cond-mat.mes-hall
null
We demonstrate the presence of energy dependent fluctuations in the localization length, which depend on the disorder distribution. These fluctuations lead to Ensemble Averaged Conductance Fluctuations (EACF) and are enhanced by large disorder. For the binary distribution the fluctuations are strongly enhanced in comparison to the Gaussian and uniform distributions. These results have important implications on ensemble averaged quantities, such as the transmission through quantum wires, where fluctuations can subsist to very high temperatures. For the non-fluctuating part of the localization length in one dimension we obtained an improved analytical expression valid for all disorder strengths by averaging the probability density.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 21:22:41 GMT" } ]
2009-11-13T00:00:00
[ [ "Hilke", "M.", "" ] ]
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711.3468
Ralf Gramlich
Alice Devillers, Ralf K\"ohl, Bernhard Muhlherr
The sphericity of the complex of non-degenerate subspaces
null
J. Lond. Math. Soc. (2) 79 (2009), no. 3, 684-700
null
null
math.CO math.GR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We prove that the complex of proper non-trivial non-degenerate subspaces of a finite-dimensional vector space endowed with a non-degenerate sesquilinear form is homotopy equivalent to a wedge of spheres. Additionally, we show that the same is true for a slight generalization, the so-called generalized Phan geometries of type A_n. These generalized Phan geometries occur as relative links of certain filtrations. Their sphericity implies finiteness properties of suitable arithmetic groups and allows for a revision of Phan's group-theoretical local recognition of suitable finite groups of Lie type with simply laced diagram.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 21:55:17 GMT" }, { "version": "v2", "created": "Mon, 10 Nov 2008 14:05:06 GMT" }, { "version": "v3", "created": "Thu, 25 Dec 2008 21:34:04 GMT" } ]
2015-03-27T00:00:00
[ [ "Devillers", "Alice", "" ], [ "Köhl", "Ralf", "" ], [ "Muhlherr", "Bernhard", "" ] ]
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711.3469
Yayu Wang
Yayu Wang, Emmanouil Kioupakis, Xinghua Lu, Daniel Wegner, Ryan Yamachika, Jeremy E. Dahl, Robert M. K. Carlson, Steven G. Louie, and Michael F. Crommie
Spatially-resolved electronic and vibronic properties of single diamondoid molecules
16 pages, 4 figures. to appear in Nature Materials
null
10.1038/nmat2066
0711.3468
cond-mat.mtrl-sci
null
Diamondoids are a unique form of carbon nanostructure best described as hydrogen-terminated diamond molecules. Their diamond-cage structures and tetrahedral sp3 hybrid bonding create new possibilities for tuning electronic band gaps, optical properties, thermal transport, and mechanical strength at the nanoscale. The recently-discovered higher diamondoids (each containing more than three diamond cells) have thus generated much excitement in regards to their potential versatility as nanoscale devices. Despite this excitement, however, very little is known about the properties of isolated diamondoids on metal surfaces, a very relevant system for molecular electronics. Here we report the first molecular scale study of individual tetramantane diamondoids on Au(111) using scanning tunneling microscopy and spectroscopy. We find that both the diamondoid electronic structure and electron-vibrational coupling exhibit unique spatial distributions characterized by pronounced line nodes across the molecular surfaces. Ab-initio pseudopotential density functional calculations reveal that the observed dominant electronic and vibronic properties of diamondoids are determined by surface hydrogen terminations, a feature having important implications for designing diamondoid-based molecular devices.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 21:32:08 GMT" } ]
2007-11-26T00:00:00
[ [ "Wang", "Yayu", "" ], [ "Kioupakis", "Emmanouil", "" ], [ "Lu", "Xinghua", "" ], [ "Wegner", "Daniel", "" ], [ "Yamachika", "Ryan", "" ], [ "Dahl", "Jeremy E.", "" ], [ "Carlson", "Robert M. K.", "" ], [ "Louie", "Steven G.", "" ], [ "Crommie", "Michael F.", "" ] ]
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711.347
Viktor A. Podolskiy
Justin Elser, Viktor A. Podolskiy
Scattering-free plasmonic optics with anisotropic metamaterials
null
Phys. Rev. Lett. v.100, p.066402 (2008)
10.1103/PhysRevLett.100.066402
null
physics.optics
null
We develop an approach to utilize anisotropic metamaterials to solve one of the fundamental problems of modern plasmonics -- parasitic scattering of surface waves into free-space modes, opening the road to truly two-dimensional plasmonic optics. We illustrate the developed formalism on examples of plasmonic refractor and plasmonic crystal, and discuss limitations of the developed technique and its possible applications for sensing and imaging structures, high-performance mode couplers, optical cloaking structures, and dynamically reconfigurable electro-plasmonic circuits.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 21:37:58 GMT" }, { "version": "v2", "created": "Mon, 4 Feb 2008 21:41:37 GMT" } ]
2008-02-11T00:00:00
[ [ "Elser", "Justin", "" ], [ "Podolskiy", "Viktor A.", "" ] ]
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711.3471
Daoxin Yao
Yen Lee Loh, Dao-Xin Yao, Erica W. Carlson
Thermodynamics of Ising spins on the Triangular Kagome Lattice: Exact analytical method and Monte Carlo simulations
15 pages, 16 figures, published version (http://www.physics.purdue.edu/~dyao/)
Phys. Rev. B 77, 134402 (2008)
10.1103/PhysRevB.77.134402
null
cond-mat.stat-mech cond-mat.other
null
We study the thermodynamics of Ising spins on the triangular kagome lattice (TKL) using exact analytic methods as well as Monte Carlo simulations. We present the free energy, internal energy, specific heat, entropy, sublattice magnetizations, and susceptibility. We describe the rich phase diagram of the model as a function of coupling constants, temperature, and applied magnetic field. For frustrated interactions in the absence of applied field, the ground state is a spin liquid phase with integer residual entropy per spin $s_0/k_B={1/9} \ln 72\approx 0.4752...$. In weak applied field, the system maps to the dimer model on a honeycomb lattice, with irrational residual entropy 0.0359 per spin and quasi-long-range order with power-law spin-spin correlations that should be detectable by neutron scattering. The power-law correlations become exponential at finite temperatures, but the correlation length may still be long.
[ { "version": "v1", "created": "Fri, 23 Nov 2007 03:32:12 GMT" }, { "version": "v2", "created": "Mon, 28 Apr 2008 20:01:30 GMT" } ]
2008-04-28T00:00:00
[ [ "Loh", "Yen Lee", "" ], [ "Yao", "Dao-Xin", "" ], [ "Carlson", "Erica W.", "" ] ]
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711.3472
Marjorie Corcoran
KTeV collaboration: A. Abouzaid, et al
Search for Lepton Flavor Violating Decays of the Neutral Kaon
5 pages, 4 figures
Phys.Rev.Lett.100:131803,2008
10.1103/PhysRevLett.100.131803
null
hep-ex
null
The Fermilab KTeV experiment has searched for lepton flavor violating decays of the KL meson in three decay modes. We observe no events in the signal region for any of the modes studied, and we set the following upper limits for their branching ratios at the 90% CL: BR(KL--> pi0 mu e) < 7.56 x 10^(-11); BR(KL--> pi0 pi0 mu e) < 1.64 x 10^(-10); BR(pi0 --> mu e) < 3.59 x 10^{-10).
[ { "version": "v1", "created": "Wed, 21 Nov 2007 21:45:28 GMT" } ]
2008-11-26T00:00:00
[ [ "KTeV collaboration", "", "" ], [ "Abouzaid", "A.", "" ] ]
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711.3473
Rupert Frank
Rupert L. Frank, Ari Laptev
Spectral inequalities for Schroedinger operators with surface potentials
Dedicated to M. Sh. Birman on the occasion of his 80th birthday
null
null
null
math-ph math.MP math.SP
null
We prove sharp Lieb-Thirring inequalities for Schroedinger operators with potentials supported on a hyperplane and we show how these estimates are related to Lieb-Thirring inequalities for relativistic Schroedinger operators.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 21:50:11 GMT" } ]
2007-11-27T00:00:00
[ [ "Frank", "Rupert L.", "" ], [ "Laptev", "Ari", "" ] ]
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711.3474
Matthew Browning
Matthew Browning, Gibor Basri
Dynamo Action in Fully Convective Low-Mass Stars
8 pages, 2 color figures (at low resolution here; contact me for high-res equivalents). in press for "Unsolved Problems in Stellar Physics," held July 2-6 in Cambridge
null
10.1063/1.2818964
null
astro-ph
null
Recent observations indicate that fully convective stars can effectively build magnetic fields without the aid of a tachocline of shear, that those fields can possess large-scale components, and that they may sense the effects of rotation. Motivated by these puzzles, we present global three-dimensional simulations of convection and dynamo action in the interiors of fully convective M-dwarfs of 0.3 solar masses. We use the Anelastic Spherical Harmonic (ASH) code, adopting a spherical computational domain that extends from 0.08-0.96 times the overall stellar radius. We find that such fully convective stars can generate magnetic fields of several kG strength, roughly in equipartition with the convective flows. Differential rotation is established in hydrodynamic progenitor calculations, but strongly quenched in MHD simulations because of strong Maxwell stresses exerted by the magnetic fields. Despite the absence of interior angular velocity contrasts, the magnetic fields possess strong mean (axisymmetric) components, which we attribute partly to the very strong influence of rotation upon the slowly overturning flows.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 21:55:05 GMT" } ]
2009-11-13T00:00:00
[ [ "Browning", "Matthew", "" ], [ "Basri", "Gibor", "" ] ]
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711.3475
Brandilyn Stigler
Winfried Just and Brandilyn Stigler
Efficiently computing Groebner bases of ideals of points
12 pages, 2 figures
null
null
null
math.AC
null
We present an algorithm for computing Groebner bases of vanishing ideals of points that is optimized for the case when the number of points in the associated variety is less than the number of indeterminates. The algorithm first identifies a set of essential variables, which reduces the time complexity with respect to the number of indeterminates, and then uses PLU decompositions to reduce the time complexity with respect to the number of points. This gives a theoretical upper bound for its time complexity that is an order of magnitude lower than the known one for the standard Buchberger-Moeller algorithm if the number of indeterminates is much larger than the number of points. Comparison of implementations of our algorithm and the standard Buchberger-Moeller algorithm in Macaulay 2 confirm the theoretically predicted speedup. This work is motivated by recent applications of Groebner bases to the problem of network reconstruction in molecular biology.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 21:59:37 GMT" } ]
2007-11-26T00:00:00
[ [ "Just", "Winfried", "" ], [ "Stigler", "Brandilyn", "" ] ]
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711.3476
Jianwei Qiu
Gouranga C. Nayak (Stony Brook/UIC), Jian-Wei Qiu (Iowa State/ANL), George Sterman (Stony Brook)
Color Transfer Enhancement for Heavy Quarkonium Production
23 pages, 8 figures, references updated, paper accepted for publication in Phys. Rev. D
Phys.Rev.D77:034022,2008
10.1103/PhysRevD.77.034022
YITP-SB-07-32, ANL-HEP-PR-07-71
hep-ph hep-ex nucl-th
null
We study the transfer of color between a heavy quark pair and an unpaired heavy quark or antiquark moving at a nonrelativistic velocity with respect to the pair. We find that the open heavy quark or antiquark can catalyze the transformation of the pair from octet representation at short distances to singlet at long distances. This process is infrared sensitive in general, and we exhibit double poles in dimensional regularization at next-to-next-to-leading order in the transition probability. Because of their dependence on kinematic variables, these poles cannot be matched to the non-perturbative matrix elements of effective field theories based on a single heavy quark pair.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 22:23:50 GMT" }, { "version": "v2", "created": "Thu, 3 Jan 2008 20:48:48 GMT" } ]
2008-11-26T00:00:00
[ [ "Nayak", "Gouranga C.", "", "Stony Brook/UIC" ], [ "Qiu", "Jian-Wei", "", "Iowa State/ANL" ], [ "Sterman", "George", "", "Stony Brook" ] ]
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711.3477
Paulina Marian
Paulina Marian, Tudor A. Marian
Gaussian entanglement of symmetric two-mode Gaussian states
Submitted to European Physical Journal Special Topics as a contribution to CEWQO, Palermo 2007
Eur. Phys. J. Special Topics 160, 281--289 (2008)
10.1140/epjst/e2008-00731-x
null
quant-ph
null
A Gaussian degree of entanglement for a symmetric two-mode Gaussian state can be defined as its distance to the set of all separable two-mode Gaussian states. The principal property that enables us to evaluate both Bures distance and relative entropy between symmetric two-mode Gaussian states is the diagonalization of their covariance matrices under the same beam-splitter transformation. The multiplicativity property of the Uhlmann fidelity and the additivity of the relative entropy allow one to finally deal with a single-mode optimization problem in both cases. We find that only the Bures-distance Gaussian entanglement is consistent with the exact entanglement of formation.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 22:32:12 GMT" } ]
2009-11-13T00:00:00
[ [ "Marian", "Paulina", "" ], [ "Marian", "Tudor A.", "" ] ]
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711.3478
Robyn Levine
Robyn Levine, Nickolay Y. Gnedin, Andrew J.S. Hamilton, and Andrey V. Kravtsov
Resolving Gas Dynamics in the Circumnuclear Region of a Disk Galaxy in a Cosmological Simulation
16 pages (includes appendix), submitted to ApJ. Figures here are at low resolution; for higher resolution version, download http://casa.colorado.edu/~levinerd/ms.pdf
Astrophys.J.678:154-167,2008
10.1086/529064
null
astro-ph
null
Using a hydrodynamic adaptive mesh refinement code, we simulate the growth and evolution of a galaxy, which could potentially host a supermassive black hole, within a cosmological volume. Reaching a dynamical range in excess of 10 million, the simulation follows the evolution of the gas structure from super-galactic scales all the way down to the outer edge of the accretion disk. Here, we focus on global instabilities in the self-gravitating, cold, turbulence-supported, molecular gas disk at the center of the model galaxy, which provide a natural mechanism for angular momentum transport down to sub-pc scales. The gas density profile follows a power-law scaling as r^-8/3, consistent with an analytic description of turbulence in a quasi-stationary circumnuclear disk. We analyze the properties of the disk which contribute to the instabilities, and investigate the significance of instability for the galaxy's evolution and the growth of a supermassive black hole at the center.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 22:28:29 GMT" } ]
2008-11-26T00:00:00
[ [ "Levine", "Robyn", "" ], [ "Gnedin", "Nickolay Y.", "" ], [ "Hamilton", "Andrew J. S.", "" ], [ "Kravtsov", "Andrey V.", "" ] ]
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711.3479
Eduardo Castro
Eduardo V. Castro, N. M. R. Peres, J. M. B. Lopes dos Santos
Gaped graphene bilayer: disorder and magnetic field effects
5 pages, 4 figures
phys. stat. sol. (b) 244, 2311 (2007)
10.1002/pssb.200674604
null
cond-mat.mes-hall cond-mat.mtrl-sci
null
Double layer graphene is a gapless semiconductor which develops a finite gap when the layers are placed at different electrostatic potentials. We study, within the tight-biding approximation, the electronic properties of the gaped graphene bilayer in the presence of disorder, perpendicular magnetic field, and transverse electric field. We show that the gap is rather stable in the presence of diagonal disorder. We compute the cyclotron effective mass in the semi-classical approximation, valid at low magnetic fields. Landau level formation is clearly seen in zigzag and armchair ribbons of the gaped bilayer at intermediate magnetic fields.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 22:23:54 GMT" } ]
2007-11-26T00:00:00
[ [ "Castro", "Eduardo V.", "" ], [ "Peres", "N. M. R.", "" ], [ "Santos", "J. M. B. Lopes dos", "" ] ]
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711.348
Christopher Phan
Christopher Phan (University of Oregon)
Generalized Koszul properties for augmented algebras
14 pages
J. Algebra 321 (2009) 1522-1537
10.1016/j.jalgebra.2008.12.011
null
math.RA
null
Under certain conditions, a filtration on an augmented algebra A admits a related filtration on the Yoneda algebra E(A) := Ext_A(K, K). We show that there exists a bigraded algebra monomorphism from gr E(A) to E_Gr(gr A), where E_Gr(gr A) is the graded Yoneda algebra of gr A. This monomorphism can be applied in the case where A is connected graded to determine that A has the K_2 property recently introduced by Cassidy and Shelton.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 22:27:58 GMT" } ]
2009-01-20T00:00:00
[ [ "Phan", "Christopher", "", "University of Oregon" ] ]
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711.3481
Shoko Jin
Shoko Jin and Donald Lynden-Bell (IoA, Cambridge)
Geometrodynamical Distances to the Galaxy's Hydrogen Streams
9 pages, 7 figures; typos corrected after being accepted by MNRAS
null
10.1111/j.1365-2966.2007.12704.x
null
astro-ph
null
We present a geometrodynamical method for determining distances to orbital streams of HI gas in the Galaxy. The method makes use of our offset from the Galactic centre and assumes that the gas comprising the stream nearly follows a planar orbit about the Galactic centre. We apply this technique to the Magellanic Stream and determine the distances to all points along it; a consistency check shows that the angular momentum is approximately constant. Applying this technique to the Large Magellanic Cloud itself gives an independent distance which agrees within its accuracy of around 10%. Relaxing the demand for exact conservation of energy and angular momentum at all points along the stream allows for an increase in orbital period between the lagging end and the front end led by the Magellanic Clouds. Similar methods are applicable to other long streams of high-velocity clouds, provided they also nearly follow planar orbits; these would allow otherwise unknown distances to be determined.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 22:56:10 GMT" }, { "version": "v2", "created": "Tue, 11 Dec 2007 12:46:56 GMT" } ]
2009-11-13T00:00:00
[ [ "Jin", "Shoko", "", "IoA, Cambridge" ], [ "Lynden-Bell", "Donald", "", "IoA, Cambridge" ] ]
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711.3482
Iwan Jensen
Anthony J. Guttmann, Jesper L. Jacobsen, Iwan Jensen and Sanjay Kumar
Modeling force-induced bio-polymer unfolding
21 pages, 11 figures, contribution to the symposium "Lattices and Trajectories", celebrating the careers of Stu Whittington and Ray Kapral
null
null
null
cond-mat.stat-mech cond-mat.soft
null
We study the conformations of polymer chains in a poor solvent, with and without bending rigidity, by means of a simple statistical mechanics model. This model can be exactly solved for chains of length up to N=55 using exact enumeration techniques. We analyze in details the differences between the constant force and constant distance ensembles for large but finite N. At low temperatures, and in the constant force ensemble, the force-extension curve shows multiple plateaus (intermediate states), in contrast with the abrupt transition to an extended state prevailing in the $N \to \infty$ limit. In the constant distance ensemble, the same curve provides a unified response to pulling and compressing forces, and agrees qualitatively with recent experimental results. We identify a cross-over length, proportional to $N$, below which the critical force of unfolding decreases with temperature, while above, it increases wiyh temperature. Finally, the force-extension curve for stiff chains exhibits "saw-tooth" like behavior, as observed in protein unfolding experiments.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 23:01:56 GMT" } ]
2007-11-26T00:00:00
[ [ "Guttmann", "Anthony J.", "" ], [ "Jacobsen", "Jesper L.", "" ], [ "Jensen", "Iwan", "" ], [ "Kumar", "Sanjay", "" ] ]
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711.3483
Jeremy Wong
Jeremy Wong
Collapsing Manifolds with Boundary
49 pages, 3 figures
null
null
null
math.DG
null
This manuscript studies manifolds-with-boundary collapsing in the Gromov-Hausdorff topology. The main aim is an understanding of the relationship of the topology and geometry of a limiting sequence of manifolds-with-boundary to that of a limit space, which is presumed to be without geodesic terminals. The main result establishes a disc bundle structure for any manifold-with-boundary having two-sided bounds on sectional curvature and second fundamental form, and a lower bound on intrinsic injectivity radius, which is sufficiently close in the Gromov-Hausdorff topology to a closed manifold. The second main result identifies Gromov-Hausdorff limits of certain sequences of manifolds-with-boundary as Alexandrov spaces of curvature bounded below.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 23:57:52 GMT" } ]
2007-11-26T00:00:00
[ [ "Wong", "Jeremy", "" ] ]
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711.3484
Nathan Jones
Nathan Jones
Averages of elliptic curve constants
22 pages
null
null
null
math.NT
null
We compute the averages over elliptic curves of the constants occurring in the Lang-Trotter conjecture, the Koblitz conjecture, and the cyclicity conjecture. The results obtained confirm the consistency of these conjectures with the corresponding ``theorems on average'' obtained recently by various authors.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 23:09:54 GMT" } ]
2007-11-26T00:00:00
[ [ "Jones", "Nathan", "" ] ]
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711.3485
Vladimir Nikiforov
Vladimir Nikiforov
A spectral stability theorem for large forbidden graphs
null
null
null
null
math.CO
null
We extend the classical stability theorem of Erdos and Simonovits in two directions: first, we allow the order of the forbidden graph to grow as log of order of the host graph, and second, our extremal condition is on the spectral radius of the host graph.
[ { "version": "v1", "created": "Thu, 22 Nov 2007 00:17:59 GMT" } ]
2007-11-26T00:00:00
[ [ "Nikiforov", "Vladimir", "" ] ]
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711.3486
Helen Johnston
Helen M. Johnston, Elaine M. Sadler, Russell Cannon, Scott M. Croom, Nicholas P. Ross and Donald P. Schneider
Radio galaxies in the 2SLAQ Luminous Red Galaxy survey: II. The stellar populations of radio-loud and radio-quiet LRGs
10 pages, 10 figures and 2 tables, accepted for publication in MNRAS
null
10.1111/j.1365-2966.2007.12741.x
null
astro-ph
null
We present an analysis of the optical spectra of a volume-limited sample of 375 radio galaxies at redshift 0.4<z<0.7 from the 2dF-SDSS Luminous Red Galaxy and QSO (2SLAQ) redshift survey. We investigate the evolution of the stellar populations and emission-line properties of these galaxies. By constructing composite spectra and comparing with a matched sample of radio-quiet sources from the same survey, we also investigate the effect on the galaxy of the presence of an active nucleus. The composite spectra, binned by redshift and radio luminosity, all require two components to describe them, which we interpret as an old and a younger population. We found no evolution with redshift of the age of the younger population in radio galaxies, nor were they different from the radio-quiet comparison sample. Similarly, there is no correlation with radio power, with the exception that the most powerful radio sources (P(1.4) > 10^26 W/Hz) have younger stars and stronger emission lines than the less powerful sources. This suggests that we have located the threshold in radio power where strong emission lines "switch on", at radio powers of around 10^26 W/Hz. Except for the very powerful radio galaxies, the presence of a currently-active radio AGN does not appear to be correlated with any change in the observed stellar population of a luminous red galaxy at z~0.5.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 23:23:01 GMT" } ]
2009-11-13T00:00:00
[ [ "Johnston", "Helen M.", "" ], [ "Sadler", "Elaine M.", "" ], [ "Cannon", "Russell", "" ], [ "Croom", "Scott M.", "" ], [ "Ross", "Nicholas P.", "" ], [ "Schneider", "Donald P.", "" ] ]
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711.3487
Robert Moore II
R. G. Moore, V. B. Nascimento, Jiandi Zhang, J. Rundgren, R. Jin, D. Mandrus, E. W. Plummer
Manifestations of Broken Symmetry: The Surface Phases of Ca(2-x)Sr(x)RuO4
4 pages, 4 figures
null
10.1103/PhysRevLett.100.066102
null
cond-mat.str-el
null
The surface structural phases of Ca(2-x)Sr(x)RuO(4) are investigated using quantitative Low Energy Electron Diffraction. The broken symmetry at the surface enhances the structural instability against the RuO6 rotational distortion while diminishing the instability against the RuO6 tilt distortion occurring within the bulk crystal. As a result, suppressed structural and electronic surface phase transition temperatures are observed, including the appearance of an inherent Mott metal-to-insulator transition for x = 0.1 and possible modifications of the surface quantum critical point near xc ~ 0.5.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 23:16:14 GMT" } ]
2009-11-13T00:00:00
[ [ "Moore", "R. G.", "" ], [ "Nascimento", "V. B.", "" ], [ "Zhang", "Jiandi", "" ], [ "Rundgren", "J.", "" ], [ "Jin", "R.", "" ], [ "Mandrus", "D.", "" ], [ "Plummer", "E. W.", "" ] ]
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711.3488
Vladimir Nikiforov
Vladimir Nikiforov
Spectral saturation: inverting the spectral Turan theorem
null
null
null
null
math.CO
null
We prove that if the spectral radius of a graph G of order n is larger than the spectral radius of the r-partite Turan graph of the same order, then G contains various supergraphs of the complete graph of order r+1. In particular G contains a complete r-partite graph of size log n with one edge added to the first part. These results complete a project of Erdos from 1963. We also give corresponding stability results.
[ { "version": "v1", "created": "Thu, 22 Nov 2007 00:16:54 GMT" } ]
2007-11-26T00:00:00
[ [ "Nikiforov", "Vladimir", "" ] ]
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711.3489
Kate Okikiolu
Kate Okikiolu
A negative mass theorem for the 2-Torus
null
null
10.1007/s00220-008-0644-9
null
math.SP math.DG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
For a closed surface M with metric g, the Robin mass m(p) at the point p is the value of the Green function G(p,q) at p=q after the logarithmic singularity has been removed. The Laplacian-mass is the average value of the Robin mass, minus the value of the Robin mass for the round sphere of the same area. The Laplacian-mass is a spectral invariant which is a natural analog of the ADM mass for asymptotically flat manifolds. We show that if M is a torus, then the minimum value of the Laplacian-mass on the conformal class of g is negative. It is attained by a (smooth) metric for which one gets a sharp logarithmic Hardy-Littlewood-Sobolev inequality and Onofri-type inequality. If the flat metric in the conformal class is sufficiently long and thin, then the minimizer for the Laplacian-mass is non-flat.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 23:50:15 GMT" }, { "version": "v2", "created": "Tue, 29 Jul 2008 00:22:19 GMT" } ]
2009-11-13T00:00:00
[ [ "Okikiolu", "Kate", "" ] ]
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711.349
Sergei Chmutov
Sergei Chmutov
Generalized duality for graphs on surfaces and the signed Bollobas-Riordan polynomial
To appear in J. Combin. Theory Ser. B (2009), doi:10.1016/j.jctb.2008.09.007
null
null
null
math.CO math.GT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We generalize the natural duality of graphs embedded into a surface to a duality with respect to a subset of edges. The dual graph might be embedded into a different surface. We prove a relation between the signed Bollobas-Riordan polynomials of dual graphs. This relation unifies various recent results expressing the Jones polynomial of links as specializations of the Bollobas-Riordan polynomials.
[ { "version": "v1", "created": "Thu, 22 Nov 2007 00:00:10 GMT" }, { "version": "v2", "created": "Mon, 24 Dec 2007 16:48:41 GMT" }, { "version": "v3", "created": "Tue, 16 Dec 2008 14:59:24 GMT" } ]
2008-12-16T00:00:00
[ [ "Chmutov", "Sergei", "" ] ]
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711.3491
Shoko Jin
Donald Lynden-Bell and Shoko Jin (IoA, Cambridge)
Analytic Central Orbits and their Transformation Group
12 pages, 8 figures; updated version with minor typographical corrections; published in MNRAS
2008MNRAS.386..245L
10.1111/j.1365-2966.2008.13018.x
null
astro-ph
null
A useful crude approximation for Abelian functions is developed and applied to orbits. The bound orbits in the power-law potentials A*r^{-alpha} take the simple form (l/r)^k = 1 + e cos(m*phi), where k = 2 - alpha > 0 and 'l' and 'e' are generalisations of the semi-latus-rectum and the eccentricity. 'm' is given as a function of 'eccentricity'. For nearly circular orbits 'm' is sqrt{k}, while the above orbit becomes exact at the energy of escape where 'e' is one and 'm' is 'k'. Orbits in the logarithmic potential that gives rise to a constant circular velocity are derived via the limit of small alpha. For such orbits, r^2 vibrates almost harmonically whatever the 'eccentricity'. Unbound orbits in power-law potentials are given in an appendix. The transformation of orbits in one potential to give orbits in a different potential is used to determine orbits in potentials that are positive powers of r. These transformations are extended to form a group which associates orbits in sets of six potentials, e.g. there are corresponding orbits in the potentials proportional to r, r^{-2/3}, r^{-3}, r^{-6}, r^{4/3} and r^{-4}. A degeneracy reduces this to three, which are r^{-1}, r^2 and r^{-4} for the Keplerian case. A generalisation of this group includes the isochrone with the Kepler set.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 23:49:04 GMT" }, { "version": "v2", "created": "Sun, 18 May 2008 16:20:39 GMT" } ]
2008-05-18T00:00:00
[ [ "Lynden-Bell", "Donald", "", "IoA, Cambridge" ], [ "Jin", "Shoko", "", "IoA, Cambridge" ] ]
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711.3492
Frederick Matsen IV
Frederick A. Matsen
Fourier transform inequalities for phylogenetic trees
null
null
null
null
q-bio.PE
null
Phylogenetic invariants are not the only constraints on site-pattern frequency vectors for phylogenetic trees. A mutation matrix, by its definition, is the exponential of a matrix with non-negative off-diagonal entries; this positivity requirement implies non-trivial constraints on the site-pattern frequency vectors. We call these additional constraints ``edge-parameter inequalities.'' In this paper, we first motivate the edge-parameter inequalities by considering a pathological site-pattern frequency vector corresponding to a quartet tree with a negative internal edge. This site-pattern frequency vector nevertheless satisfies all of the constraints described up to now in the literature. We next describe two complete sets of edge-parameter inequalities for the group-based models; these constraints are square-free monomial inequalities in the Fourier transformed coordinates. These inequalities, along with the phylogenetic invariants, form a complete description of the set of site-pattern frequency vectors corresponding to \emph{bona fide} trees. Said in mathematical language, this paper explicitly presents two finite lists of inequalities in Fourier coordinates of the form ``monomial $\leq 1$,'' each list characterizing the phylogenetically relevant semialgebraic subsets of the phylogenetic varieties.
[ { "version": "v1", "created": "Wed, 21 Nov 2007 23:57:41 GMT" }, { "version": "v2", "created": "Sun, 10 Feb 2008 15:37:04 GMT" }, { "version": "v3", "created": "Wed, 28 May 2008 23:00:11 GMT" } ]
2008-05-29T00:00:00
[ [ "Matsen", "Frederick A.", "" ] ]
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711.3493
Vladimir Nikiforov
Vladimir Nikiforov
Graphs with many copies of a given subgraph
null
null
null
null
math.CO
null
We show that if a graph G of order n contains many copies of a given subgraph H, then it contains a blow-up of H of order log n.
[ { "version": "v1", "created": "Thu, 22 Nov 2007 00:06:04 GMT" } ]
2007-11-26T00:00:00
[ [ "Nikiforov", "Vladimir", "" ] ]
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711.3494
Sergei Ipatov
Sergei I. Ipatov, Alexander S. Kutyrev, Greg J. Madsen, John C. Mather, S. Harvey Moseley, Ronald J. Reynolds
Dynamical Zodiacal Cloud Models Constrained by High Resolution Spectroscopy of the Zodiacal Light (Icarus, in press)
Icarus, in press
Icarus 194:769-788,2008
10.1016/j.icarus.2007.11.009
null
astro-ph
null
The simulated Doppler shifts of the solar Mg I Fraunhofer line produced by scattering on the solar light by asteroidal, cometary, and trans-Neptunian dust particles are compared with the shifts obtained by Wisconsin H-Alpha Mapper (WHAM) spectrometer. The simulated spectra are based on the results of integrations of the orbital evolution of particles. The deviation of the derived spectral parameters for various sources of dust used in the model reached maximum at the elongation (measured eastward from the Sun) between 90 deg and 120 deg. For the future zodiacal light Doppler shifts measurements, it is important to pay a particular attention to observing at this elongation range. At the elongations of the fields observed by WHAM, the model-predicted Doppler shifts were close to each other for several scattering functions considered. Therefore the main conclusions of our paper don't depend on a scattering function and mass distribution of particles if they are reasonable. A comparison of the dependencies of the Doppler shifts on solar elongation and the mean width of the Mg I line modeled for different sources of dust with those obtained from the WHAM observations shows that the fraction of cometary particles in zodiacal dust is significant and can be dominant. Cometary particles originating inside Jupiter's orbit and particles originating beyond Jupiter's orbit (including trans-Neptunian dust particles) can contribute to zodiacal dust about 1/3 each, with a possible deviation from 1/3 up to 0.1-0.2. The fraction of asteroidal dust is estimated to be about 0.3-0.5. The mean eccentricities of zodiacal particles located at 1-2 AU from the Sun that better fit the WHAM observations are between 0.2 and 0.5, with a more probable value of about 0.3.
[ { "version": "v1", "created": "Thu, 22 Nov 2007 00:15:23 GMT" }, { "version": "v2", "created": "Fri, 14 Dec 2007 23:37:13 GMT" } ]
2010-12-01T00:00:00
[ [ "Ipatov", "Sergei I.", "" ], [ "Kutyrev", "Alexander S.", "" ], [ "Madsen", "Greg J.", "" ], [ "Mather", "John C.", "" ], [ "Moseley", "S. Harvey", "" ], [ "Reynolds", "Ronald J.", "" ] ]
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711.3495
Johannes Pollanen
J. Pollanen, K. Shirer, S. Blinstein, J.P. Davis, H. Choi, T.M. Lippman, L.B. Lurio, W.P. Halperin
Globally Anisotropic High Porosity Silica Aerogels
18 pages, 14 figures, submitted to Journal of Non-Crystalline Solids
null
10.1016/j.jnoncrysol.2008.05.047
null
cond-mat.other
null
We discuss two methods by which high porosity silica aerogels can be engineered to exhibit global anisotropy. First, anisotropy can be introduced with axial strain. In addition, intrinsic anisotropy can result during growth and drying stages and, suitably controlled, it can be correlated with preferential radial shrinkage in cylindrical samples. We have performed small angle X-ray scattering (SAXS) to characterize these two types of anisotropy. We show that global anisotropy originating from either strain or shrinkage leads to optical birefringence and that optical cross-polarization studies are a useful characterization of the uniformity of the imposed global anisotropy.
[ { "version": "v1", "created": "Thu, 22 Nov 2007 00:21:12 GMT" } ]
2009-11-13T00:00:00
[ [ "Pollanen", "J.", "" ], [ "Shirer", "K.", "" ], [ "Blinstein", "S.", "" ], [ "Davis", "J. P.", "" ], [ "Choi", "H.", "" ], [ "Lippman", "T. M.", "" ], [ "Lurio", "L. B.", "" ], [ "Halperin", "W. P.", "" ] ]
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711.3496
Leonid Gurvits
Leonid Gurvits
Van der Waerden/Schrijver-Valiant like Conjectures and Stable (aka Hyperbolic) Homogeneous Polynomials : One Theorem for all
A slightly corrected (a few typos fixed) version of EJC paper. This version is self-contained and elementary. Written as a Lecture Notes, can be used in an undergraduate/graduate combinatorics course
The Electronic Journal of Combinatorics, 2008
null
null
math.CO math.AG
null
Let $p$ be a homogeneous polynomial of degree $n$ in $n$ variables, $p(z_1,...,z_n) = p(Z)$, $Z \in C^{n}$. We call such a polynomial $p$ {\bf H-Stable} if $p(z_1,...,z_n) \neq 0$ provided the real parts $Re(z_i) > 0, 1 \leq i \leq n$. This notion from {\it Control Theory} is closely related to the notion of {\it Hyperbolicity} used intensively in the {\it PDE} theory. The main theorem in this paper states that if $p(x_1,...,x_n)$ is a homogeneous {\bf H-Stable} polynomial of degree $n$ with nonnegative coefficients; $deg_{p}(i)$ is the maximum degree of the variable $x_i$, $C_i = \min(deg_{p}(i),i)$ and $$ Cap(p) = \inf_{x_i > 0, 1 \leq i \leq n} \frac{p(x_1,...,x_n)}{x_1 ... x_n} $$ then the following inequality holds $$ \frac{\partial^n}{\partial x_1... \partial x_n} p(0,...,0) \geq Cap(p) \prod_{2 \leq i \leq n} (\frac{C_i -1}{C_i})^{C_{i}-1}. $$ This inequality is a vast (and unifying) generalization of the Van der Waerden conjecture on the permanents of doubly stochastic matrices as well as the Schrijver-Valiant conjecture on the number of perfect matchings in $k$-regular bipartite graphs. These two famous results correspond to the {\bf H-Stable} polynomials which are products of linear forms. Our proof is relatively simple and ``noncomputational''; it uses just very basic properties of complex numbers and the AM/GM inequality.
[ { "version": "v1", "created": "Thu, 22 Nov 2007 00:33:45 GMT" }, { "version": "v2", "created": "Tue, 13 May 2008 22:29:14 GMT" } ]
2008-05-14T00:00:00
[ [ "Gurvits", "Leonid", "" ] ]
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711.3497
Vladimir Nikiforov
Vladimir Nikiforov
The energy of C4-free graphs of bounded degree
Some typos corrected
null
null
null
math.CO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Answering some questions of Gutman, we show that, except for four specific trees, every connected graph G of order n, with no cycle of order 4 and with maximum degree at most 3, has energy greater that its order. Here, the energy of a graph is the sum of the moduli of its eigenvalues. We give more general theorems and state two conjectures.
[ { "version": "v1", "created": "Thu, 22 Nov 2007 00:35:38 GMT" }, { "version": "v2", "created": "Thu, 8 Apr 2021 14:37:55 GMT" } ]
2021-04-09T00:00:00
[ [ "Nikiforov", "Vladimir", "" ] ]
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711.3498
Paul Cook
Paul P. Cook
Connections between Kac-Moody algebras and M-theory
209 pages, PhD thesis, King's College, University of London, September 2006
null
null
null
hep-th
null
We investigate some of the motivations and consequences of the conjecture that the Kac-Moody algebra E11 is the symmetry algebra of M-theory, and we develop methods to aid the further investigation of this idea. The definitions required to work with abstract root systems of Lie algebras are given in review leading up to the definition of a Kac-Moody algebra. The motivations for the E11 conjecture are presented and the nonlinear realisation of gravity relevant to the conjecture is described. We give a beginner's guide to producing the algebras of E11, relevant to M-theory, and K27, relevant to the bosonic string theory, along with their l1 representations are constructed. Reference tables of low level roots are produced for both the adjoint and l1 representations of these algebras. In addition a particular group element, having a generic form for all G+++ algebras, is shown to encode all the half-BPS brane solutions of the maximally oxidised supergravities. Special analysis is given to the role of space-time signature in the context of this group element and subsequent to this analysis spacelike brane solutions are derived from the same solution generating group element. Finally the appearance of U-duality charge multiplets from E11 is reviewed. General formulae for finding the content of arbitrary brane charge multiplets are given and the content of the particle and string multiplets in dimensions 4,5,6,7 and 8 is shown to be contained in the l1 representation of E11.
[ { "version": "v1", "created": "Thu, 22 Nov 2007 01:38:53 GMT" } ]
2007-11-26T00:00:00
[ [ "Cook", "Paul P.", "" ] ]
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711.3499
Luc Binette
Luc Binette and Yair Krongold
The unusual UV continuum of quasar Ton 34 and the possibility of crystalline dust absorption
7 figures, to appear in A&A
null
10.1051/0004-6361:20078176
null
astro-ph
null
Luminous quasars are known to display a sharp steepening of the continuum near 1100A. This spectral feature is not well fitted by current accretion disk models, unless comptonization of the disk emission is invoked. Absorption by carbon crystalline dust has been proposed to account for this feature. Ton 34 (z=1.928) exhibits the steepest far-UV decline (F_nu prop nu^{-5.3}) among the 183 quasar HST-FOS spectra analyzed by Telfer et al. It is an ideal object to test the crystalline dust hypothesis as well as alternative interpretations of the UV break. We reconstruct the UV spectral energy distribution of Ton 34 by combining HST, IUE and Palomar spectra. The far-UV continuum shows a very deep continuum trough, which is bounded by a steep far-UV rise. We fit the trough assuming nanodiamond dust grains. Extinction by carbon crystalline dust reproduces the deep absorption trough of Ton 34 reasonably well, but not the observed steep rise in the extreme UV. We also study the possibility of an intrinsic continuum rollover. The dust might be part of a high velocity outflow (13000 km/s), which is observed in absorption in the lines of CIV, OVI, NV and Ly_alpha.
[ { "version": "v1", "created": "Thu, 22 Nov 2007 03:00:36 GMT" } ]
2009-11-13T00:00:00
[ [ "Binette", "Luc", "" ], [ "Krongold", "Yair", "" ] ]
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711.35
Shiguo Lian
Shiguo Lian
Secure Fractal Image Coding
21 pages, 8 figures. To be submitted
null
null
null
cs.MM cs.CR
null
In recent work, various fractal image coding methods are reported, which adopt the self-similarity of images to compress the size of images. However, till now, no solutions for the security of fractal encoded images have been provided. In this paper, a secure fractal image coding scheme is proposed and evaluated, which encrypts some of the fractal parameters during fractal encoding, and thus, produces the encrypted and encoded image. The encrypted image can only be recovered by the correct key. To keep secure and efficient, only the suitable parameters are selected and encrypted through in-vestigating the properties of various fractal parameters, including parameter space, parameter distribu-tion and parameter sensitivity. The encryption process does not change the file format, keeps secure in perception, and costs little time or computational resources. These properties make it suitable for secure image encoding or transmission.
[ { "version": "v1", "created": "Thu, 22 Nov 2007 03:53:29 GMT" } ]
2007-11-26T00:00:00
[ [ "Lian", "Shiguo", "" ] ]
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711.3501
Toshiki Maruyama
Toshiki Maruyama, Satoshi Chiba, Hans-Josef Schulze, Toshitaka Tatsumi
Hyperon-Quark Mixed Phase in Compact Stars
oral presentation at INPC 2007, Tokyo
null
10.1088/0954-3899/35/10/104076
null
nucl-th
null
We investigate the properties of the hadron-quark mixed phase in compact stars using a Brueckner-Hartree-Fock framework for hadronic matter and the MIT bag model for quark matter. We find that the equation of state of the mixed phase is similar to that given by the Maxwell construction. The composition of the mixed phase, however, is very different from that of the Maxwell construction; in particular, hyperons are completely suppressed.
[ { "version": "v1", "created": "Thu, 22 Nov 2007 04:43:30 GMT" } ]
2009-11-13T00:00:00
[ [ "Maruyama", "Toshiki", "" ], [ "Chiba", "Satoshi", "" ], [ "Schulze", "Hans-Josef", "" ], [ "Tatsumi", "Toshitaka", "" ] ]
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711.3502
Wen-jie Liu
Liu Wen-jie, Chen Han-wu, Li Zhi-qiang, Liu Zhi-hao
Efficient quantum direct communication with authentication
4 pages, 4 tables
Chinese Physics Letters 2008, 25, 2354-2357
10.1088/0256-307X/25/7/007
null
quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Two protocols of quantum direct communication with authentication [Phys. Rev. A 73, 042305(2006)] were recently indicated to be insecure against the authenticator Trent's attacks [Phys. Rev. A 75, 026301(2007)]. We present two efficient protocols by using four Pauli operations, which are secure against inner Trent's attacks as well as outer Eve's attacks. Finally, we generalize them to multiparty quantum direction communication.
[ { "version": "v1", "created": "Thu, 22 Nov 2007 04:48:03 GMT" }, { "version": "v2", "created": "Mon, 26 Nov 2007 08:49:00 GMT" }, { "version": "v3", "created": "Thu, 19 Dec 2013 14:49:52 GMT" } ]
2015-05-13T00:00:00
[ [ "Wen-jie", "Liu", "" ], [ "Han-wu", "Chen", "" ], [ "Zhi-qiang", "Li", "" ], [ "Zhi-hao", "Liu", "" ] ]
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711.3503
Jeremy Sumner
J. G. Sumner, M. A. Charleston, L. S. Jermiin, and P. D. Jarvis
Markov invariants, plethysms, and phylogenetics (the long version)
39 pages, 10 figures, 2 tables, 3 appendices. Long arxiv version includes extended introduction, subsection on mixed-weight invariants, 3rd appendix on K3ST model and a more relaxed pace with additional discussion throughout. "Short version" is to appear in Journal of Theoretical Biology. v4: Sequence length in simulation was corrected from N=1000 to N=10000
J. Theor. Biol., 253:601--615, 2008
null
null
q-bio.PE math-ph math.MP q-bio.QM
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We explore model based techniques of phylogenetic tree inference exercising Markov invariants. Markov invariants are group invariant polynomials and are distinct from what is known in the literature as phylogenetic invariants, although we establish a commonality in some special cases. We show that the simplest Markov invariant forms the foundation of the Log-Det distance measure. We take as our primary tool group representation theory, and show that it provides a general framework for analysing Markov processes on trees. From this algebraic perspective, the inherent symmetries of these processes become apparent, and focusing on plethysms, we are able to define Markov invariants and give existence proofs. We give an explicit technique for constructing the invariants, valid for any number of character states and taxa. For phylogenetic trees with three and four leaves, we demonstrate that the corresponding Markov invariants can be fruitfully exploited in applied phylogenetic studies.
[ { "version": "v1", "created": "Thu, 22 Nov 2007 05:09:12 GMT" }, { "version": "v2", "created": "Mon, 26 Nov 2007 10:14:59 GMT" }, { "version": "v3", "created": "Tue, 8 Jul 2008 07:24:02 GMT" }, { "version": "v4", "created": "Tue, 22 Jul 2008 23:00:29 GMT" } ]
2012-04-24T00:00:00
[ [ "Sumner", "J. G.", "" ], [ "Charleston", "M. A.", "" ], [ "Jermiin", "L. S.", "" ], [ "Jarvis", "P. D.", "" ] ]
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711.3504
Toshiki Maruyama
Toshiki Maruyama, Satoshi Chiba, Toshitaka Tatsumi
Non-Uniform Structure of Matter and the Equation of State
Invited talk at "Nuclear Dynamics in Heavy-ion Reactions and Neutron Stars", Beijing, July 10-14, 2007
Int.J.Mod.Phys.E17:1774-1789,2008
10.1142/S0218301308010775
null
nucl-th
null
We investigate the non-uniform structures and the equation of state (EOS) of nuclear matter in the context of the first-order phase transitions (FOPT) such as liquid-gas phase transition, kaon condensation, and hadron-quark phase transition. During FOPT the mixed phases appear, where matter exhibits non-uniform structures called ``Pasta'' structures due to the balance of the Coulomb repulsion and the surface tension between two phases. We treat these effects self-consistently, properly taking into account of the Poisson equation and the Gibbs conditions. Consequently, they make the EOS of the mixed phase closer to that of Maxwell construction due to the Debye screening. This is a general feature of the mixed phase consisting of many species of charged particles.
[ { "version": "v1", "created": "Thu, 22 Nov 2007 05:03:35 GMT" } ]
2008-12-25T00:00:00
[ [ "Maruyama", "Toshiki", "" ], [ "Chiba", "Satoshi", "" ], [ "Tatsumi", "Toshitaka", "" ] ]
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711.3505
Chun-Hsu Su
Chun-Hsu Su, Andrew D. Greentree, and Lloyd C. L. Hollenberg
Towards a picosecond transform-limited nitrogen-vacancy based single photon source
10 pages, 8 figures
Optics Express, vol. 16, no. 9, pp. 6240-6250 (2008)
10.1364/OE.16.006240
null
quant-ph
null
We analyze a nitrogen-vacancy (NV^-) colour centre based single photon source based on cavity Purcell enhancement of the zero phonon line and suppression of other transitions. Optimal performance conditions of the cavity-centre system are analyzed using Master equation and quantum trajectory methods. By coupling the centre strongly to a high-finesse optical cavity [Q ~ O(10^4-10^5), V ~ lambda^3] and using sub-picosecond optical excitation the system has striking performance, including effective lifetime of 70 ps, linewidth of 0.01 nm, near unit single photon emission probability and small [O(10^-5)] multi-photon probability.
[ { "version": "v1", "created": "Thu, 22 Nov 2007 06:01:42 GMT" }, { "version": "v2", "created": "Wed, 4 Jun 2008 01:30:57 GMT" } ]
2009-11-13T00:00:00
[ [ "Su", "Chun-Hsu", "" ], [ "Greentree", "Andrew D.", "" ], [ "Hollenberg", "Lloyd C. L.", "" ] ]
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711.3506
Toshiki Maruyama
Toshiki Maruyama, Satoshi Chiba, Hans-Josef Schulze, Toshitaka Tatsumi
Hyperon-Quark Mixed Phase in Dense Matter
Invited talk at "Exotic States of Matter 2007 (EXOCT2007)", Catania, June 10-19, 2007
null
10.1142/9789812797049_0045
null
nucl-th
null
We investigate the properties of the hadron-quark mixed phase in compact stars using a Brueckner-Hartree-Fock framework for hadronic matter and the MIT bag model for quark matter. We find that the equation of state of the mixed phase is similar to that given by the Maxwell construction. The composition of the mixed phase, however, is very different from that of the Maxwell construction; in particular, hyperons are completely suppressed.
[ { "version": "v1", "created": "Thu, 22 Nov 2007 05:18:42 GMT" } ]
2017-08-23T00:00:00
[ [ "Maruyama", "Toshiki", "" ], [ "Chiba", "Satoshi", "" ], [ "Schulze", "Hans-Josef", "" ], [ "Tatsumi", "Toshitaka", "" ] ]
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711.3507
Xueqing Yan Dr
X.Q. Yan, C. Lin, Z.M. Sheng, Z.Y. Guo, B.C.Liu, Y.R. Lu, J.X. Fang, J.E. Chen
Monoenergetic proton beams accelerated by circularly polarized laser with thin solid foils
I had presentation in LPAW07, Portugal
null
null
null
physics.acc-ph physics.plasm-ph
null
The acceleration of ions in the interaction of circular polarized laser pulses with overdense plasmas is investigated. For circular polarization laser pulses, the quasi-equilibrium for electrons is established due to the light pressure and the electrostatic field built up at the interacting front of the laser pulse. The ions located within the skin-depth of the laser pulse can be synchronously accelerated and bunched in the charge couple processes by the electrostatic field, and thereby monoenergetic and high intensity proton beam can be generated. The dynamics equations for accelerated ions are deduced and proved by particle-in-cell simulations.
[ { "version": "v1", "created": "Thu, 22 Nov 2007 05:26:29 GMT" }, { "version": "v2", "created": "Sat, 22 Dec 2007 14:22:53 GMT" } ]
2007-12-26T00:00:00
[ [ "Yan", "X. Q.", "" ], [ "Lin", "C.", "" ], [ "Sheng", "Z. M.", "" ], [ "Guo", "Z. Y.", "" ], [ "Liu", "B. C.", "" ], [ "Lu", "Y. R.", "" ], [ "Fang", "J. X.", "" ], [ "Chen", "J. E.", "" ] ]
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