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711.3808
Oded Schramm
Oded Schramm
Hyperfinite graph limits
null
null
null
null
math.PR math.CO
null
G\'abor Elek introduced the notion of a hyperfinite graph family: a collection of graphs is hypefinite if for every $\epsilon>0$ there is some finite $k$ such that each graph $G$ in the collection can be broken into connected components of size at most $k$ by removing a set of edges of size at most $\epsilon|V(G)|$. We presently extend this notion to a certain compactification of finite bounded-degree graphs, and show that if a sequence of finite graphs converges to a hyperfinite limit, then the sequence itself is hyperfinite.
[ { "version": "v1", "created": "Sat, 24 Nov 2007 02:00:00 GMT" } ]
2007-11-27T00:00:00
[ [ "Schramm", "Oded", "" ] ]
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711.3809
Avi Loeb
Abraham Loeb, Ramesh Narayan (Harvard)
Dynamical Constraints on the Local Group from the CMB and 2MRS Dipoles
5 pages, 2 figures, Accepted for publication in MNRAS
null
10.1111/j.1365-2966.2008.13187.x
null
astro-ph
null
We place constraints on the dynamics of the Local Group (LG) by comparing the dipole of the Cosmic Microwave Background (CMB) with the peculiar velocity induced by the 2MRS galaxy sample. The analysis is limited by the lack of surveyed galaxies behind the Zone of Avoidance (ZoA). We therefore allow for a component of the LG velocity due to unknown mass concentrations behind the ZoA, as well as for an unknown transverse velocity of the Milky Way relative to the Andromeda galaxy. We infer extra motion along the direction of the Galactic center (where Galactic confusion and dust obscuration peaks) at the 95% significance level. With a future survey of the ZoA it might be possible to constrain the transverse velocity of the Milky Way relative to Andromeda.
[ { "version": "v1", "created": "Sat, 24 Nov 2007 02:19:49 GMT" }, { "version": "v2", "created": "Wed, 19 Mar 2008 18:55:07 GMT" } ]
2009-11-13T00:00:00
[ [ "Loeb", "Abraham", "", "Harvard" ], [ "Narayan", "Ramesh", "", "Harvard" ] ]
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711.381
Mikhail Smolyakov
Mikhail N. Smolyakov, Igor P. Volobuev
On a stabilized warped brane world without Planck brane
7 pages, LaTeX, typos corrected, 1 figure added, discussion enlarged
null
null
null
hep-th
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We discuss a stabilized brane world model with two branes, admitting the solution to the hierarchy problem due to the warped extra dimension and possessing a remarkable feature: the strength of gravitational interaction is of the same order on both branes, contrary to the case of the Randall-Sundrum model with a hierarchical difference of gravitational strength on the branes. The solution also admits the existence of two branes with an equal strength of gravitational interaction, which is of interest for treating the matter on the "mirror" brane as dark matter.
[ { "version": "v1", "created": "Sun, 25 Nov 2007 07:14:35 GMT" }, { "version": "v2", "created": "Mon, 3 Nov 2008 14:12:59 GMT" } ]
2008-11-03T00:00:00
[ [ "Smolyakov", "Mikhail N.", "" ], [ "Volobuev", "Igor P.", "" ] ]
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711.3811
Mikhail Smolyakov
Mikhail N. Smolyakov
A small cosmological constant from the modified Brans-Dicke theory - an interplay between different energy scales
10 pages, LaTeX, references added
null
null
null
gr-qc astro-ph hep-th
null
In this paper we discuss a model in which the energy density, corresponding to the effective cosmological constant, after the $SU(2)\times U(1)$ symmetry breaking appears to be of the desired order of $10^{-48}\div 10^{-47} GeV^{4}$. The model contain two different energy scales, one of which is associated with the Higgs's vacuum expectation value. Another scale is of the order of $10^{21}GeV$ and defines the vacuum expectation value of the Brans-Dicke scalar field, non-minimally coupled to gravity, and sets the value of the Planck mass. Other (dimensionless) parameters are assumed not to contain hierarchical differences. The model is devoid of any fine-tuning and gives a small value of the effective cosmological constant even if the real "bare" cosmological constant is quite large.
[ { "version": "v1", "created": "Mon, 26 Nov 2007 20:22:08 GMT" }, { "version": "v2", "created": "Sun, 2 Dec 2007 21:29:28 GMT" } ]
2007-12-02T00:00:00
[ [ "Smolyakov", "Mikhail N.", "" ] ]
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711.3812
Sorin Tanase-Nicola
Sorin Tanase-Nicola and Pieter Rein ten Wolde
Regulatory control and the costs and benefits of biochemical noise
Revised manuscript;35 pages, 4 figures, REVTeX4; to appear in PLoS Computational Biology
null
10.1371/journal.pcbi.1000125
null
q-bio.MN q-bio.PE
null
Experiments in recent years have vividly demonstrated that gene expression can be highly stochastic. How protein concentration fluctuations affect the growth rate of a population of cells, is, however, a wide open question. We present a mathematical model that makes it possible to quantify the effect of protein concentration fluctuations on the growth rate of a population of genetically identical cells. The model predicts that the population's growth rate depends on how the growth rate of a single cell varies with protein concentration, the variance of the protein concentration fluctuations, and the correlation time of these fluctuations. The model also predicts that when the average concentration of a protein is close to the value that maximizes the growth rate, fluctuations in its concentration always reduce the growth rate. However, when the average protein concentration deviates sufficiently from the optimal level, fluctuations can enhance the growth rate of the population, even when the growth rate of a cell depends linearly on the protein concentration. The model also shows that the ensemble or population average of a quantity, such as the average protein expression level or its variance, is in general not equal to its time average as obtained from tracing a single cell and its descendants. We apply our model to perform a cost-benefit analysis of gene regulatory control. Our analysis predicts that the optimal expression level of a gene regulatory protein is determined by the trade-off between the cost of synthesizing the regulatory protein and the benefit of minimizing the fluctuations in the expression of its target gene. We discuss possible experiments that could test our predictions.
[ { "version": "v1", "created": "Sat, 24 Nov 2007 03:52:14 GMT" }, { "version": "v2", "created": "Sun, 4 May 2008 02:42:45 GMT" } ]
2015-05-13T00:00:00
[ [ "Tanase-Nicola", "Sorin", "" ], [ "Wolde", "Pieter Rein ten", "" ] ]
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711.3813
Xiang Liu
Xiang Liu and Bo Zhang
What can we learn from the decay of $ N_X(1625)$ in molecule picture?
6 pages, 3 figures, 2 tables. The title changed. More discussion added
Eur.Phys.J.C54:253-258,2008
10.1140/epjc/s10052-008-0527-4
null
hep-ph hep-ex nucl-ex nucl-th
null
Considering two molecular state assumptions, i.e. S-wave $\bar{\Lambda}-K^-$ and S-wave $\bar{\Sigma}^0-K^-$ molecular states, we study the possible decays of $\bar N_X(1625)$ that include $\bar N_X(1625)\to K^{-}\bar{\Lambda}, \pi^{0}\bar{p}, \eta\bar{p}, \pi^{-}\bar{n}$. Our results indicate: (1) if $\bar N_{X}(1625)$ is $\bar{\Lambda}-K^-$ molecular state, $K^{-}\bar{\Lambda}$ is the main decay modes of $\bar N_{X}(1625)$, and the branching ratios of the rest decay modes are tiny; (2) if $\bar N_{X}(1625)$ is $\bar{\Sigma}^0-K^-$ molecular state, the branching ratio of $\bar N_{X}(1625)\to K^{-}\bar{\Lambda}$ is one or two order smaller than that of $\bar N_{X}(1625)\to \pi^{0}\bar{p}, \eta\bar{p}, \pi^{-}\bar{n}$. Thus the search for $\bar N_X(1625)\to \pi^{0}\bar{p}, \eta\bar{p}, \pi^{-}\bar{n}$ will be helpful to shed light on the nature of $\bar N_X(1625)$.
[ { "version": "v1", "created": "Sat, 24 Nov 2007 04:29:23 GMT" }, { "version": "v2", "created": "Wed, 12 Dec 2007 14:56:46 GMT" } ]
2008-11-26T00:00:00
[ [ "Liu", "Xiang", "" ], [ "Zhang", "Bo", "" ] ]
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711.3814
LiangGang Liu
M.H. Zhu, L.G. Liu, Z. You, A.A. Xu
Least Squares Fitting of Low-Level Gamma-ray Spectra with B-Spline Basis Functions
6 pages, 11 figures, 1 table
2008 Congress on Image and Signal Processing, Vol. 1 pp. 691-695
null
null
math.SP
null
In this paper, new methods for smoothing gamma-ray spectra measured by NaI detector are derived. Least squares fitting method with B-spline basis functions is used to reduce the influence of statistical fluctuations. The derived procedures are simple and automatic. The results show that this method is better than traditional method with a more complete reduction of staistical fluctuation.
[ { "version": "v1", "created": "Sat, 24 Nov 2007 04:31:40 GMT" } ]
2008-08-12T00:00:00
[ [ "Zhu", "M. H.", "" ], [ "Liu", "L. G.", "" ], [ "You", "Z.", "" ], [ "Xu", "A. A.", "" ] ]
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711.3815
Withawat Withayachumnankul
W. Withayachumnankul, B. M. Fischer, and D. Abbott
Optimisation of sample thickness for THz-TDS measurements
13 pages, 11 figures
Optics Express, Vol. 16, Issue 10, pp. 7382-7396, 2008
10.1364/OE.16.007382
null
physics.optics cond-mat.mtrl-sci
null
How thick should the sample be for a transmission THz-TDS measurement? Should the sample be as thick as possible? The answer is `no'. Although more thickness allows T-rays to interact more with bulk material, SNR rolls off with thickness due to signal attenuation. Then, should the sample be extremely thin? Again, the answer is `no'. A sample that is too thin renders itself nearly invisible to T-rays, in such a way that the system can hardly sense the difference between the sample and a free space path. So, where is the optimal boundary between `too thick' and `too thin'? The trade-off is analysed and revealed in this paper, where our approach is to find the optimal thickness that results in the minimal variance of measured optical constants.
[ { "version": "v1", "created": "Sat, 24 Nov 2007 04:54:53 GMT" } ]
2008-07-16T00:00:00
[ [ "Withayachumnankul", "W.", "" ], [ "Fischer", "B. M.", "" ], [ "Abbott", "D.", "" ] ]
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711.3816
Roland E. Allen
Roland E. Allen, Zorawar Wadiasingh, and Seiichirou Yokoo
Standard supersymmetry from a Planck-scale statistical theory
8 pages, to be published in the proceedings of DARK2007, Sixth International Heidelberg Conference on Dark Matter (Sydney, Australia, September 24-28, 2007)
null
10.1142/9789812814357_0021
null
physics.gen-ph gr-qc hep-th
null
We outline three new ideas in a program to obtain standard physics, including standard supersymmetry, from a Planck-scale statistical theory: (1) The initial spin 1/2 bosonic fields are transformed to spin 0 fields together with their auxiliary fields. (2) Time is defined by the progression of 3-geometries, just as originally proposed by DeWitt. (3) The initial (D-1)-dimensional "path integral" is converted from Euclidean to Lorentzian form by transformation of the fields in the integrand.
[ { "version": "v1", "created": "Sat, 24 Nov 2007 23:00:34 GMT" } ]
2017-08-23T00:00:00
[ [ "Allen", "Roland E.", "" ], [ "Wadiasingh", "Zorawar", "" ], [ "Yokoo", "Seiichirou", "" ] ]
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711.3817
Anders Ryd
A. Ryd
Determination of Charm Hadronic Branching Fractions at CLEO-c
7 pages, 6 figures. To be published in the proceedings of CHARM07, Ithaca, NY, August 2007, eConf C070805
ECONF C070805:33,2007
null
null
hep-ex
null
Recent results from CLEO-c on measurements of absolute hadronic branching fractions of D0, D+, and Ds+ mesons are presented.
[ { "version": "v1", "created": "Sat, 24 Nov 2007 05:06:01 GMT" } ]
2010-01-05T00:00:00
[ [ "Ryd", "A.", "" ] ]
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711.3818
Mikko Stenlund
Arvind Ayyer, Carlangelo Liverani, Mikko Stenlund
Quenched CLT for random toral automorphism
18 pages
Discrete and Continuous Dynamical Systems - A, Volume 24, Issue 2, 2009, pp. 331-348
10.3934/dcds.2009.24.331
null
math.DS math.PR
null
We establish a quenched Central Limit Theorem (CLT) for a smooth observable of random sequences of iterated linear hyperbolic maps on the torus. To this end we also obtain an annealed CLT for the same system. We show that, almost surely, the variance of the quenched system is the same as for the annealed system. Our technique is the study of the transfer operator on an anisotropic Banach space specifically tailored to use the cone condition satisfied by the maps.
[ { "version": "v1", "created": "Sat, 24 Nov 2007 05:08:35 GMT" } ]
2011-10-18T00:00:00
[ [ "Ayyer", "Arvind", "" ], [ "Liverani", "Carlangelo", "" ], [ "Stenlund", "Mikko", "" ] ]
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711.3819
Hans Bruntt
H. Bruntt, P. De Cat, C. Aerts
A spectroscopic study of southern (candidate) gamma Doradus stars. II. Detailed abundance analysis and fundamental parameters
13 pages, accepted by A&A
null
10.1051/0004-6361:20078523
null
astro-ph
null
The gamma Doradus stars are a recent class of variable main sequence F-type stars located on the red edge of the Cepheid instability strip. They pulsate in gravity modes, and this makes them particularly interesting for detailed asteroseismic analysis, which can provide fundamental knowledge of properties near the convective cores of intermediate-mass main sequence stars. To improve current understanding of gamma Dor stars through theoretical modelling, additional constraints are needed. Our aim is to estimate the fundamental atmospheric parameters and determine the chemical composition of these stars. Detailed analyses of single stars have previously suggested links to Am and lambda Bootis stars, so we wish to explore this interesting connection between chemical peculiarity and pulsation. We have analysed a sample of gamma Dor stars for the first time, including nine bona fide and three candidate members of the class. We determined the fundamental atmospheric parameters and compared the abundance pattern with other A-type stars. We used the semi-automatic software package VWA for the analysis. This code relies on the calculation of synthetic spectra and thus takes line-blending into account. This is important because of the fast rotation in some of the sample stars, and we made a thorough analysis of how VWA performs when increasing vsini. We obtained good results in agreement with previously derived fundamental parameters and abundances in a few selected reference stars with properties similar to the gamma Dor stars. We find that the abundance pattern in the gamma Dor stars is not distinct from the constant A- and F-type stars we analysed.
[ { "version": "v1", "created": "Sat, 24 Nov 2007 05:44:56 GMT" } ]
2009-11-13T00:00:00
[ [ "Bruntt", "H.", "" ], [ "De Cat", "P.", "" ], [ "Aerts", "C.", "" ] ]
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711.382
Elizabeth Beazley
E. T. Mili\'cevi\'c (Beazley)
Codimensions of Newton Strata for SL_3 in the Iwahori Case
37 pages, 1 figure; introduction and main theorem expanded, corrected typos, updated references; to appear in Math. Zeit
Math. Zeit. 263, no. 3, p. 499-540, 2009
null
null
math.AG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study the Newton stratification on SL_3(F), where F is a Laurent power series field. We provide a formula for the codimensions of the Newton strata inside each component of the affine Bruhat decomposition on SL_3(F). These calculations are related to the study of certain affine Deligne-Lusztig varieties. In particular, we describe a method for determining which of these varieties is non-empty in the case of SL_3(F).
[ { "version": "v1", "created": "Sat, 24 Nov 2007 05:50:38 GMT" }, { "version": "v2", "created": "Mon, 25 Aug 2008 22:43:18 GMT" } ]
2016-06-29T00:00:00
[ [ "Milićević", "E. T.", "", "Beazley" ] ]
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711.3821
Simon Lloyd
C. Gutierrez, S. Lloyd, V. Medvedev, B. Pires and E. Zhuzhoma
Unique ergodicity of circle and interval exchange transformations with flips
13 pages, 6 figures; notational changes, smaller figures
Discrete Contin. Dyn. Syst. 26(1) (2010), 251--263.
10.3934/dcds.2010.26.251
null
math.DS
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study the existence of transitive exchange maps with flips defined on the unit circle. We provide a complete answer to the question of whether there exists a transitive exchange map of the unit circle defined on n subintervals and having f flips.
[ { "version": "v1", "created": "Sat, 24 Nov 2007 06:32:37 GMT" }, { "version": "v2", "created": "Wed, 10 Sep 2008 03:54:42 GMT" } ]
2010-01-29T00:00:00
[ [ "Gutierrez", "C.", "" ], [ "Lloyd", "S.", "" ], [ "Medvedev", "V.", "" ], [ "Pires", "B.", "" ], [ "Zhuzhoma", "E.", "" ] ]
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711.3822
Theodore A. Jacobson
Ted Jacobson
Einstein-aether gravity: theory and observational constraints
8 pages, for proceedings of 4th Meeting on CPT and Lorentz Symmetry (CPT 07), Bloomington, Indiana, 8-11 Aug 2007
null
10.1142/9789812779519_0014
null
gr-qc astro-ph hep-ph hep-th
null
Einstein-aether theory is general relativity coupled to a dynamical unit timelike vector field. A brief review of current theoretical understanding and observational constraints on the four coupling parameters of the theory is given.
[ { "version": "v1", "created": "Sat, 24 Nov 2007 06:49:09 GMT" } ]
2016-11-09T00:00:00
[ [ "Jacobson", "Ted", "" ] ]
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711.3823
Cassisi Santi
S. Cassisi (INAF - OACTe), M. Salaris (John Moores Univ.), A. Pietrinferni (INAF - OACTe), G. Piotto (Padua Univ.), A.P. Milone (Padua Univ.), L.R. Bedin (Space Telescope Inst.), J. Anderson (Rice Univ.)
The double Subgiant Branch of NGC 1851: the role of the CNO abundance
12 pages, 2 figures, ApJ Letter in press
null
10.1086/527035
null
astro-ph
null
We explore the possibility that the anomalous split in the Subgiant branch of the galactic globular cluster NGC 1851 is due to the presence of two distinct stellar populations with very different initial metal mixtures: a normal alpha-enhanced component, and one characterized by strong anticorrelations among the CNONa abundances, with a total CNO abundance increased by a factor of two. We test this hypothesis taking into account various empirical constraints, and conclude that the two populations should be approximately coeval, with the same initial He-content. More high-resolution spectroscopical measurements of heavy elements -- and in particular of the CNO sum -- for this cluster are necessary to prove (or disprove) this scenario.
[ { "version": "v1", "created": "Sat, 24 Nov 2007 08:04:15 GMT" } ]
2009-11-13T00:00:00
[ [ "Cassisi", "S.", "", "INAF - OACTe" ], [ "Salaris", "M.", "", "John Moores Univ." ], [ "Pietrinferni", "A.", "", "INAF - OACTe" ], [ "Piotto", "G.", "", "Padua Univ." ], [ "Milone", "A. P.", "", "Padua\n Univ." ], [ "Bedin", "L. R.", "", "Space Telescope Inst." ], [ "Anderson", "J.", "", "Rice Univ." ] ]
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711.3824
Csaba Kiss
Cs. Kiss, A. Pal, Th.G. Mueller, P. Abraham
The impact of main belt asteroids on infrared--submillimetre photometry and source counts
accepted for publication in Astronomy & Astrophysics; Additional material (appendices) and the related web-interface can be found at: "http://kisag.konkoly.hu/solarsystem/irsam.html"
null
10.1051/0004-6361:20078574
null
astro-ph
null
<<>> Among the components of the infrared and submillimetre sky background, the closest layer is the thermal emission of dust particles and minor bodies in the Solar System. This contribution is especially important for current and future infrared and submillimetre space instruments --like those of Spitzer, Akari and Herschel -- and must be characterised by a reliable statistical model. <<>> We describe the impact of the thermal emission of main belt asteroids on the 5...1000um photometry and source counts, for the current and future spaceborne and ground-based instruments, in general, as well as for specific dates and sky positions. <<>> We used the statistical asteroid model (SAM) to calculate the positions of main belt asteroids down to a size of 1km, and calculated their infrared and submillimetre brightness using the standard thermal model. Fluctuation powers, confusion noise values and number counts were derived from the fluxes of individual asteroids. <<>> We have constructed a large database of infrared and submillimetre fluxes for SAM asteroids with a temporal resolution of 5 days, covering the time span January 1, 2000 -- December 31, 2012. Asteroid fluctuation powers and number counts derived from this database can be obtained for a specific observation setup via our public web-interface. <<>> Current space instruments working in the mid-infrared regime (Akari and Spitzer Space Telescopes) are affected by asteroid confusion noise in some specific areas of the sky, while the photometry of space infrared and submillimetre instruments in the near future (e.g. Herschel and Planck Space Observatories) will not be affected by asteroids. Faint main belt asteroids might also be responsible for most of the zodiacal emission fluctuations near the ecliptic.
[ { "version": "v1", "created": "Sat, 24 Nov 2007 08:22:42 GMT" }, { "version": "v2", "created": "Wed, 28 Nov 2007 21:20:08 GMT" } ]
2009-11-13T00:00:00
[ [ "Kiss", "Cs.", "" ], [ "Pal", "A.", "" ], [ "Mueller", "Th. G.", "" ], [ "Abraham", "P.", "" ] ]
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711.3825
Majid Mohammadi
M.Mohammadi, M.H.Naderi, M.Soltanolkotabi
Effects of a classical homogeneous gravitational field on the cavity-field entropy and generation of the Schrodinger-cat states in the Jaynes-Cummings model
15 pages, 9figures
null
10.1140/epjd/e2008-00046-x
null
quant-ph
null
In this paper, we examine the effects of the gravitational field on the dynamical evolution of the cavity-field entropy and the creation of the Schrodinger-cat state in the Jaynes-Cummings model. We consider a moving two-level atom interacting with a single mode quantized cavity-field in the presence of a classical homogeneous gravitational field. Based on an su(2) algebra, as the dynamical symmetry group of the model, we derive the reduced density operator of the cavity-field which includes the effects of the atomic motion and the gravitational field. Also, we obtain the exact solution and the approximate solution for the system-state vector, and examine the atomic dynamics. By considering the temporal evolution of the cavity-field entropy as well as the dynamics of the Q-function of the cavity-field we study the effects of the gravitational field on the generation of the Schrodinger-cat states of the cavity-field by using the Q-function, field entropy and approximate solution for the system-state vector. The results show that the gravitational field destroys the generation of the Schrodinger-cat state of the cavity-field.
[ { "version": "v1", "created": "Sat, 24 Nov 2007 08:54:43 GMT" } ]
2009-11-13T00:00:00
[ [ "Mohammadi", "M.", "" ], [ "Naderi", "M. H.", "" ], [ "Soltanolkotabi", "M.", "" ] ]
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711.3826
Stefan Kirchner
Stefan Kirchner and Qimiao Si
Bose-Fermi Kondo model with Ising anisotropy: cluster-Monte Carlo approach
2 pages, 2 figures, to appear in the proceedings of SCES 07 (the international conference on strongly correlated electron systems 2007)
Physica B (2007)
10.1016/j.physb.2007.10.298
null
cond-mat.str-el
null
The Bose-Fermi Kondo model captures the physics of the destruction of Kondo screening, which is of extensive current interest to the understanding of quantum critical heavy fermion metals. There are presently limited theoretical methods to study the finite temperature properties of the Bose-Fermi Kondo model. Here we provide some of the consistency checks on the cluster-Monte Carlo method, which we have recently applied to the Ising-anisotropic Bose-Fermi Kondo model. We show that the method correctly captures the scaling properties of the Kondo phase, as well as those on approach to the Kondo-destroying quantum critical point. We establish that comparable results are obtained when the Kondo couplings are placed at or away from a Toulouse point.
[ { "version": "v1", "created": "Mon, 26 Nov 2007 00:49:07 GMT" } ]
2009-11-13T00:00:00
[ [ "Kirchner", "Stefan", "" ], [ "Si", "Qimiao", "" ] ]
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711.3827
Xueliang Li
Xueliang Li, Jie Zheng
Monochromatic and heterochromatic subgraph problems in a randomly colored graph
11 pages
null
null
null
math.CO
null
Let $K_n$ be the complete graph with $n$ vertices and $c_1, c_2, ..., c_r$ be $r$ different colors. Suppose we randomly and uniformly color the edges of $K_n$ in $c_1, c_2, ..., c_r$. Then we get a random graph, denoted by $\mathcal{K}_n^r$. In the paper, we investigate the asymptotic properties of several kinds of monochromatic and heterochromatic subgraphs in $\mathcal{K}_n^r$. Accurate threshold functions in some cases are also obtained.
[ { "version": "v1", "created": "Sat, 24 Nov 2007 09:36:46 GMT" } ]
2007-11-27T00:00:00
[ [ "Li", "Xueliang", "" ], [ "Zheng", "Jie", "" ] ]
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711.3828
Jarek Kedra
Jarek Kedra
Symplectically hyperbolic manifolds
18 pages; preliminary version
null
null
null
math.SG math.GT
null
A symplectic form is called hyperbolic if its pull-back to the universal cover is a differential of a bounded one-form. The present paper is concerned with the properties and constructions of manifolds admitting hyperbolic symplectic forms. The main results are: * If a symplectic form represents a bounded cohomology class then it is hyperbolic. * The symplectic hyperbolicity is equivalent to a certain isoperimetric inequality. * The fundamental group of symplectically hyperbolic manifold is non-amenable. We also construct hyperbolic symplectic forms on certain bundles and Lefschetz fibrations, discuss the dependenc of the symplectic hyperbolicity on the fundamental group and discuss some properties of the group of symplectic diffeomorphisms of a symplectically hyperbolic manifold.
[ { "version": "v1", "created": "Sat, 24 Nov 2007 20:03:30 GMT" } ]
2007-11-27T00:00:00
[ [ "Kedra", "Jarek", "" ] ]
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711.3829
Pietro Faccioli
M.C. Tichy and P. Faccioli
The Scalar Glueball in the Instanton Vacuum
Version accepted for publication on EPJ C
null
null
null
hep-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study the contribution of instantons to the binding and the mass of the lightest scalar glueball, in gluondynamics. We show that the short-range correlations introduced by such non-perturbative vacuum fluctuations are sufficient to give raise to a scalar glueball bound-state, with mass in good agreement with the results of recent lattice calculations.
[ { "version": "v1", "created": "Sat, 24 Nov 2007 10:08:21 GMT" }, { "version": "v2", "created": "Tue, 22 Apr 2008 10:45:05 GMT" }, { "version": "v3", "created": "Sat, 18 Jul 2009 20:47:53 GMT" } ]
2009-07-18T00:00:00
[ [ "Tichy", "M. C.", "" ], [ "Faccioli", "P.", "" ] ]
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711.383
Parimal Kar
S. Trebst and U.H.E. Hansmann
Optimized Folding Simulations of Protein A
6 pages, 8 figures
Eur. Phys. J. E 24, 311 (2007).
10.1140/epje/i2007-10241-1
null
cond-mat.stat-mech
null
We describe optimized parallel tempering simulations of the 46-residue B-fragment of protein A. Native-like configurations with a root-mean-square deviation of approximately 3A to the experimentally determined structure (Protein Data Bank identifier 1BDD) are found. However, at biologically relevant temperatures such conformations appear with only about 10% frequency in our simulations. Possible short comings in our energy function are discussed.
[ { "version": "v1", "created": "Mon, 26 Nov 2007 20:59:43 GMT" }, { "version": "v2", "created": "Sat, 29 Dec 2007 20:17:28 GMT" } ]
2008-05-05T00:00:00
[ [ "Trebst", "S.", "" ], [ "Hansmann", "U. H. E.", "" ] ]
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711.3831
Andreas Nunnenkamp
Andreas Nunnenkamp, Ana Maria Rey, Keith Burnett
Generation of macroscopic superposition states in ring superlattices
9 pages, 10 figures; minor corrections
Phys. Rev. A 77, 023622 (2008)
10.1103/PhysRevA.77.023622
null
cond-mat.other quant-ph
null
Ultracold bosons in rotating ring lattices have previously been shown to form macroscopic superpositions of different quasi-momentum states. We demonstrate that the generation of such kind of states using slightly non-uniform ring lattices has several advantages: the energy gap decreases less severely with the number of particles, the sensitivity to detunings from the critical rotation frequency is reduced, and the scheme is not limited to commensurate filling. We show that different quasi-momentum states can be distinguished in time-of-flight absorption imaging and propose to probe correlations via the many-body oscillations induced by a sudden change in the rotation frequency.
[ { "version": "v1", "created": "Sat, 24 Nov 2007 10:19:40 GMT" }, { "version": "v2", "created": "Thu, 21 Feb 2008 16:48:06 GMT" } ]
2008-02-27T00:00:00
[ [ "Nunnenkamp", "Andreas", "" ], [ "Rey", "Ana Maria", "" ], [ "Burnett", "Keith", "" ] ]
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711.3832
Alexey Muranov
Tuna Alt{\i}nel and Alexey Muranov
Interpr\'etation de l'Arithm\'etique dans certains groupes de permutations affines par morceaux d'un intervalle
v3: French, 29 pages, 3 figures, minor corrections; v2: 29 pages, 3 figures, corrections, added references, no essential changes; v1: 28 pages, 3 figures
Journal of the Institute of Mathematics of Jussieu, Volume 8, Issue 04, October 2009, pp. 623--652
10.1017/S1474748009000024
null
math.LO math.GR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The Arithmetic is interpreted in all the groups of Richard Thompson and Graham Higman, as well as in other groups of piecewise affine permutations of an interval which generalize the groups of Thompson and Higman. In particular, the elementary theories of all these groups are undecidable. Moreover, Thompson's group $F$ and some of its generalizations interpret the Arithmetic without parameters.
[ { "version": "v1", "created": "Mon, 26 Nov 2007 15:15:49 GMT" }, { "version": "v2", "created": "Mon, 7 Jul 2008 17:59:01 GMT" }, { "version": "v3", "created": "Sat, 12 Sep 2009 08:23:44 GMT" } ]
2022-03-28T00:00:00
[ [ "Altınel", "Tuna", "" ], [ "Muranov", "Alexey", "" ] ]
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711.3833
Shahram Jalalzadeh
P. Pedram, M. Mirzaei, S. Jalalzadeh and S. S. Gousheh
Perfect fluid quantum Universe in the presence of negative cosmological constant
22 pages, 13 figures, 4 table, to appear in GRG
Gen.Rel.Grav.40:1663-1681,2008
10.1007/s10714-007-0566-4
null
gr-qc
null
We present perfect fluid Friedmann-Robertson-Walker quantum cosmological models in the presence of negative cosmological constant. In this work the Schutz's variational formalism is applied for radiation, dust, cosmic string, and domain wall dominated Universes with positive, negative, and zero constant spatial curvature. In this approach the notion of time can be recovered. These give rise to Wheeler-DeWitt equations for the scale factor. We find their igenvalues and eigenfunctions by using Spectral Method. After that, we use the eigenfunctions in order to construct wave packets for each case and evaluate the time-dependent expectation value of the scale factors, which are found to oscillate between finite maximum and minimum values. Since the expectation values of the scale factors never tends to the singular point, we have an initial indication that these models may not have singularities at the quantum level.
[ { "version": "v1", "created": "Sat, 24 Nov 2007 12:20:56 GMT" } ]
2008-11-26T00:00:00
[ [ "Pedram", "P.", "" ], [ "Mirzaei", "M.", "" ], [ "Jalalzadeh", "S.", "" ], [ "Gousheh", "S. S.", "" ] ]
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711.3834
Jonathan Lilly
Jonathan M. Lilly and Sofia C. Olhede
On the Analytic Wavelet Transform
null
Lilly, J. M., and S. C. Olhede (2010). On the analytic wavelet transform. IEEE Transactions on Information Theory, 56 (8), 4135--4156
10.1109/TIT.2010.2050935
null
math.ST math.FA stat.ME stat.TH
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
An exact and general expression for the analytic wavelet transform of a real-valued signal is constructed, resolving the time-dependent effects of non-negligible amplitude and frequency modulation. The analytic signal is first locally represented as a modulated oscillation, demodulated by its own instantaneous frequency, and then Taylor-expanded at each point in time. The terms in this expansion, called the instantaneous modulation functions, are time-varying functions which quantify, at increasingly higher orders, the local departures of the signal from a uniform sinusoidal oscillation. Closed-form expressions for these functions are found in terms of Bell polynomials and derivatives of the signal's instantaneous frequency and bandwidth. The analytic wavelet transform is shown to depend upon the interaction between the signal's instantaneous modulation functions and frequency-domain derivatives of the wavelet, inducing a hierarchy of departures of the transform away from a perfect representation of the signal. The form of these deviation terms suggests a set of conditions for matching the wavelet properties to suit the variability of the signal, in which case our expressions simplify considerably. One may then quantify the time-varying bias associated with signal estimation via wavelet ridge analysis, and choose wavelets to minimize this bias.
[ { "version": "v1", "created": "Sat, 24 Nov 2007 12:32:35 GMT" }, { "version": "v2", "created": "Wed, 28 Oct 2009 13:17:36 GMT" }, { "version": "v3", "created": "Sat, 15 Oct 2011 16:33:06 GMT" } ]
2011-10-18T00:00:00
[ [ "Lilly", "Jonathan M.", "" ], [ "Olhede", "Sofia C.", "" ] ]
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711.3835
Angelo Loinger
Angelo Loinger
Einsteinian Manifolds and Gravitational Waves
5 pages, LaTeX
null
null
null
physics.gen-ph
null
The full relativity of the concepts of motion and rest, which is characteristic of the Einsteinian general relativity (GR), does not allow the generation of physical gravitational waves (GW's). -- The undulatory nature of a metric tensor is not an invariant property, but depends on the coordinate frame. -- An undulation of a metric tensor is propagated with a speed that can have any value between zero and infinite.
[ { "version": "v1", "created": "Sat, 24 Nov 2007 12:43:22 GMT" } ]
2007-11-27T00:00:00
[ [ "Loinger", "Angelo", "" ] ]
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711.3836
Chengming Bai
Yi-Fang Kang, Cheng-Ming Bai
Refinement of Ado's Theorem in Low Dimensions and Application in Affine Geometr
11 pages, 4 tables, appear in Communications in Algebra
Communications in Algebra 36 (2008) 82-93
10.1080/00927870701649382
null
math.QA math-ph math.MP
null
In this paper, we construct a faithful representation with the lowest dimension for every complex Lie algebra in dimension $\leq 4$. In particular, in our construction, in the case that the faithful representation has the same dimension of the Lie algebra, it can induce an \'etale affine representation with base zero which has a natural and simple form and gives a compatible left-symmetric algebra on the Lie algebra. Such affine representations do not contain any nontrivial one-parameter subgroups of translation.
[ { "version": "v1", "created": "Sat, 24 Nov 2007 13:45:39 GMT" } ]
2008-03-03T00:00:00
[ [ "Kang", "Yi-Fang", "" ], [ "Bai", "Cheng-Ming", "" ] ]
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711.3837
Zhijian Wang
Zhijian Wang, Weidong Luo
Coevolution of Mercy and Altruistic Cooperation
null
null
null
ICSSZJU_WL_071122
nlin.AO nlin.PS
null
Besides altruistic punishment and group selection, we argue that, mercy can lead to altruistic cooperation. Modeling the micro economic behavior of the mercy, with two alleles of genes (Cooperation or Defection & Mercy or No mercy) agents in a network, we present the computational simulation results in the spatiotemporal evolution game theory frame to prove the above argument. Here, mercy (or as 'Love thy neighbors') means, the agents, with mercy preference, might share his own fitness with his poorest neighbor who poorer than himself.
[ { "version": "v1", "created": "Sat, 24 Nov 2007 13:56:20 GMT" } ]
2007-11-27T00:00:00
[ [ "Wang", "Zhijian", "" ], [ "Luo", "Weidong", "" ] ]
[ 0.0738688037, -0.0535235815, 0.0775205046, 0.1424165517, 0.0639570281, 0.0677652359, 0.0238404255, 0.1119508818, -0.1057429835, -0.0340391211, 0.0188714955, -0.0864411071, 0.0371691547, 0.0447855704, 0.0086662816, -0.0018079206, 0.0996915847, -0.0562362783, 0.1085078418, 0.0779378489, -0.0269443765, 0.0390210897, 0.0872236118, 0.0663045496, -0.020475639, -0.0377169102, 0.0009748752, 0.1361564845, 0.0728254542, -0.1515979767, -0.025914073, -0.0043885685, -0.0351085477, -0.0555059351, -0.1616140902, 0.0898841396, 0.0040983884, -0.0077663967, -0.0228492487, -0.0066317595, -0.0286137275, -0.0733471289, -0.0480981879, 0.0214798581, -0.0390993394, 0.0154023757, -0.0440291427, 0.016563097, 0.0126896789, 0.0514890589, -0.0416816175, 0.0074142679, 0.0027942073, -0.0471070111, -0.0545147583, -0.0003478495, -0.0011582756, -0.0471330956, -0.0098530864, -0.0439248085, -0.0461158343, -0.0145807415, 0.0073816632, 0.0620268397, -0.0075577279, -0.0504196286, -0.1635964364, -0.1382431686, 0.0396992639, 0.0831545666, -0.004414652, -0.0596793145, 0.0821112245, 0.0211016461, 0.0185063258, -0.0119136916, 0.0080467956, 0.1263490319, 0.0014614976, 0.0204886813, 0.0417598709, -0.009116224, 0.1095511913, -0.0239056349, -0.001435414, -0.1329221129, -0.0013930282, -0.0183759071, -0.0500022918, 0.0069252001, -0.00331751, -0.020853851, -0.1243666857, -0.0226927456, 0.1273923814, 0.0102769444, 0.0205017217, -0.0527671576, 0.0589489713, 0.0375082418, -0.0486198626, -0.1325047761, 0.0772596747, -0.0032718636, -0.0025773873, 0.0028887605, -0.0030713459, -0.106942825, 0.0216494016, 0.0385255031, -0.0622876771, 0.0413425304, -0.0079946285, 0.0468200929, -0.0731384605, -0.1067341566, -0.1359478086, -0.0250141881, 0.0661480501, -0.09802223, -0.0217406936, 0.0348998792, -0.0139286509, -0.0331783593, -0.1126812249, -0.010883389, 0.0634875223, -0.086701937, 0.0318741798, -0.1009957641, 0.0355258845, 0.0079033356, -0.026487913, -0.0209581852, -0.0567057803, 0.0028105096, 0.0099900253, 0.0519063957, -0.0917621627, -0.0704779327, 0.0417337865, -0.0241664704, 0.0014166664, -0.0483068563, -0.0274660476, 0.0111768292, 0.0323176011, -0.0546190925, -0.0909274891, 0.0189236645, 0.0223667007, 0.0089205969, 0.0232665855, 0.0722516179, -0.0388385057, -0.0025154387, -0.0334391966, 0.0323958509, -0.0865454376, -0.067400068, -0.0214016065, 0.0458289124, -0.1314614266, -0.0318220109, 0.0303874128, 0.0303352457, -0.1725692004, 0.0497414581, -0.0744426399, -0.0258749481, 0.0509152189, -0.0519324802, -0.1214453205, 0.0255228188, -0.0334391966, -0.1051691398, -0.0320306793, -0.0840935782, -0.0428814664, 0.0100095877, 0.0241534282, -0.0420467891, -0.0465331711, 0.0241403878, -0.0440552272, 0.0606704913, -0.0148676615, 0.1400168538, -0.0773640051, 0.0254836939, 0.0675565675, 0.0333348624, 0.1878020316, -0.0360997245, 0.0748599768, -0.0996915847, 0.0523237325, 0.0567579493, 0.0254184846, -0.0259531979, 0.0333870277, 0.0862846002, 0.144085899, -0.0632266849, -0.0226927456, -0.0741296411, 0.0245446824, 0.0223014913, -0.0550364293, 0.0193410013, 0.0823198929, 0.062913686, 0.0886321291, -0.016080549, 0.0054351734, -0.0715212747, -0.0349520445, 0.0335696153, -0.03722132, 0.1059516519, -0.0416816175, 0.0513586402, 0.0272312947, 0.0407686941, -0.0265139956, 0.0329957753, -0.0152197899, -0.132817775, 0.0349259637, -0.0509152189, 0.0394123457, 0.0356823877, -0.0297092386, -0.0701127574, -0.0060840035, -0.0557667725, -0.0289788973, 0.0355780534, -0.004342922, -0.0000360942, 0.0292397346, 0.0404556878, 0.0289267302, 0.0400644355, -0.0491415337, 0.0580099635, -0.0953095332, -0.1629704386, -0.0084836958, -0.0651047081, 0.0160935912, 0.0610878281, 0.080024533, -0.0010368237, 0.004342922, 0.0227318723 ]
711.3838
Yanrui Liu
Yan-Rui Liu, Shi-Lin Zhu
The \Delta contribution to the parity-violating nucleon-nucleon force
5 pages, 2 figures. The version appeared in Chinese Physics C (HEP & NP)
Chin.Phys.32:700-704,2008
10.1088/1674-1137/32/9/005
null
nucl-th
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Because the nucleon may be excited and transformed into a virtual $\Delta$ resonance easily, we consider the decuplet contribution to the parity-violating (PV) nucleon-nucleon interaction in the chiral effective field theory. The effective PV nucleon-nucleon potential is derived without introducing any unknown coupling constants.
[ { "version": "v1", "created": "Sat, 24 Nov 2007 14:04:20 GMT" }, { "version": "v2", "created": "Mon, 25 Aug 2008 15:40:03 GMT" } ]
2015-05-13T00:00:00
[ [ "Liu", "Yan-Rui", "" ], [ "Zhu", "Shi-Lin", "" ] ]
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711.3839
Valy Rousseau
V.G. Rousseau
The Stochastic Green Function (SGF) algorithm
12 pages, 5 figures
Phys. Rev. E 77, 056705 (2008)
10.1103/PhysRevE.77.056705
null
cond-mat.stat-mech
null
We present the Stochastic Green Function (SGF) algorithm designed for bosons on lattices. This new quantum Monte Carlo algorithm is independent of the dimension of the system, works in continuous imaginary time, and is exact (no error beyond statistical errors). Hamiltonians with several species of bosons (and one-dimensional Bose-Fermi Hamiltonians) can be easily simulated. Some important features of the algorithm are that it works in the canonical ensemble and gives access to n-body Green functions.
[ { "version": "v1", "created": "Sat, 24 Nov 2007 14:55:16 GMT" }, { "version": "v2", "created": "Thu, 6 Dec 2007 11:03:49 GMT" }, { "version": "v3", "created": "Tue, 29 Apr 2008 19:17:03 GMT" } ]
2008-11-03T00:00:00
[ [ "Rousseau", "V. G.", "" ] ]
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711.384
G\"unter Stolz
Robert Sims and G\"unter Stolz
Eigenvalue Correlations in Continuum one-dimensional Anderson Models
This paper has been withdrawn
null
null
null
math-ph math.MP
null
The methods used to prove the main result must be incorrect, as they can be used to arrive at a contradiction with previously known results. Thus the paper was withdrawn.
[ { "version": "v1", "created": "Sat, 24 Nov 2007 15:09:46 GMT" }, { "version": "v2", "created": "Tue, 26 Feb 2008 15:19:24 GMT" } ]
2008-02-26T00:00:00
[ [ "Sims", "Robert", "" ], [ "Stolz", "Günter", "" ] ]
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711.3841
Silvio Capobianco
Silvio Capobianco
On the Induction Operation for Shift Subspaces and Cellular Automata as Presentations of Dynamical Systems
20 pages, no figures. Presented at LATA 2008. Extended version, submitted to Information and Computation
null
null
null
math.DS
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We consider continuous, translation-commuting transformations of compact, translation-invariant families of mappingsfrom finitely generated groups into finite alphabets. It is well-known that such transformations and spaces can be described "locally" via families of patterns and finitary functions; such descriptions can be re-used on groups larger than the original, usually defining non-isomorphic structures. We show how some of the properties of the "induced" entities can be deduced from those of the original ones, and vice versa; then, we show how to "simulate" the smaller structure into the larger one, and obtain a characterization in terms of group actions for the dynamical systems admitting of presentations via structures as such. Special attention is given to the class of sofic shifts.
[ { "version": "v1", "created": "Mon, 26 Nov 2007 15:13:26 GMT" }, { "version": "v2", "created": "Mon, 16 Jun 2008 15:44:59 GMT" } ]
2008-06-16T00:00:00
[ [ "Capobianco", "Silvio", "" ] ]
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711.3842
Georgi Raikov
Philippe Briet, Georgi Raikov, Eric Soccorsi
Spectral Properties of a Magnetic Quantum Hamiltonian on a Strip
29 pages
null
null
null
math-ph math.MP
null
We consider a 2D Schroedinger operator H0 with constant magnetic field, on a strip of finite width. The spectrum of H0 is absolutely continuous, and contains a discrete set of thresholds. We perturb H0 by an electric potential V which decays in a suitable sense at infinity, and study the spectral properties of the perturbed operator H = H0 + V . First, we establish a Mourre estimate, and as a corollary prove that the singular continuous spectrum of H is empty, and any compact subset of the complement of the threshold set may contain at most a finite set of eigenvalues of H, each of them having a finite multiplicity. Next, we introduce the Krein spectral shift function (SSF) for the operator pair (H,H0). We show that this SSF is bounded on any compact subset of the complement of the threshold set, and is continuous away from the threshold set and the eigenvalues of H. The main results of the article concern the asymptotic behaviour of the SSF at the thresholds, which is described in terms of the SSF for a pair of effective Hamiltonians.
[ { "version": "v1", "created": "Sat, 24 Nov 2007 15:35:16 GMT" } ]
2007-11-27T00:00:00
[ [ "Briet", "Philippe", "" ], [ "Raikov", "Georgi", "" ], [ "Soccorsi", "Eric", "" ] ]
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711.3843
Anton Zeitlin
Anton M. Zeitlin
SFT-inspired Algebraic Structures in Gauge Theories
LaTeX2e, 26 pages; minor revisions after referee's remarks, typos corrected, title changed, references added, J. Mathematical Physics, in press
J. Math. Phys. 50, 063501 (2009)
10.1063/1.3142964
null
hep-th math-ph math.MP math.QA
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We consider gauge theories in a String Field Theory-inspired formalism. The constructed algebraic operations lead in particular to homotopy algebras of the related BV theories. We discuss invariant description of the gauge fixing procedure and special algebraic features of gauge theories coupled to matter fields.
[ { "version": "v1", "created": "Sat, 24 Nov 2007 15:56:58 GMT" }, { "version": "v2", "created": "Fri, 22 Feb 2008 04:17:28 GMT" }, { "version": "v3", "created": "Wed, 6 May 2009 18:49:00 GMT" } ]
2009-06-05T00:00:00
[ [ "Zeitlin", "Anton M.", "" ] ]
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711.3844
Tracy Beck
Tracy L. Beck (1 and 2), Peter J. McGregor (3), Michihiro Takami (4 and 5) and Tae-Soo Pyo (4), ((1) Gemini North Observatory Hilo, HI, (2) Space Telescope Science Institute, Baltimore, MD, (3) Research School of Astronomy & Astrophysics, Australian National University, Australia, (4) Subaru Telescope, Hilo, HI, (5) Institute of Astronomy & Astrophysics, Academia Sinica, Taipei, Taiwan, R. O. C.)
Spatially Resolved Molecular Hydrogen Emission in the Inner 200AU Environments of Classical T Tauri Stars
50 pages, 13 Figures. Accepted for publication in the Astrophysical Journal. Full Resolution paper available at: http://www.astro.sunysb.edu/tracy/pubs/Beck07.pdf
null
10.1086/527528
null
astro-ph
null
We present 2.0-2.4micron integral field spectroscopy at adaptive optics spatial resolution (~0.''1) obtained with the Near-infrared Integral Field Spectrograph (NIFS) at Gemini North Observatory of six Classical T Tauri stars: T Tau, DG Tau, XZ Tau, HL Tau, RW Aur and HV Tau C. In all cases, the v=1-0 S(1) (2.12 micron) emission is detected at spatially extended distances from the central stars. The bulk of the H_2 emission is typically not spatially coincident with the location of continuum flux. Multiple transitions detected in the K-band spectra show that H_2 level populations are typical of gas in thermal equilibrium with excitation temperatures in the 1800K-2300 K range. Three of the stars have H_2 velocity profiles that are centered at the stellar radial velocity, and three show velocity shifts with respect to the system. Each of the stars studied here show observed excitation temperatures, spatial extents, and kinematics of the H_2 that are most consistent with shock excited emission from the inner regions of the known Herbig-Haro energy flows or from wide-angle winds encompassing the outflows rather than predominantly from UV or X-ray stimulated emission from the central stars. The data presented in this study highlights the sensitivity of adaptive optics-fed integral field spectroscopy for spatially resolving emission line structures in the environments of bright young stars.
[ { "version": "v1", "created": "Sat, 24 Nov 2007 16:05:20 GMT" } ]
2009-11-13T00:00:00
[ [ "Beck", "Tracy L.", "", "1 and 2" ], [ "McGregor", "Peter J.", "", "4\n and 5" ], [ "Takami", "Michihiro", "", "4\n and 5" ], [ "Pyo", "Tae-Soo", "" ] ]
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711.3845
Goncalo Tabuada
Goncalo Tabuada
Differential graded versus Simplicial categories
22 pages
null
null
null
math.KT math.AT
null
We construct a zig-zag of Quillen adjunctions between the homotopy theories of differential graded and simplicial categories. In an intermediate step we generalize Shipley-Schwede's work on connective DG algebras by extending the Dold-Kan correspondence to a Quillen equivalence between categories enriched over positive graded chain complexes and simplicial k-modules. As an application we obtain a conceptual explanation of Simpson's homotopy fiber construction.
[ { "version": "v1", "created": "Sat, 24 Nov 2007 16:05:43 GMT" } ]
2007-11-27T00:00:00
[ [ "Tabuada", "Goncalo", "" ] ]
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711.3846
Richard J. Furnstahl
R.J. Furnstahl
Similarity Renormalization Group for Few-Body Systems
3 pages, 6 figures. To appear in the proceedings of the 20th European Conference on Few-Body Problems in Physics (EFB20), Pisa, September 10-14, 2007
Few Body Syst.44:133-136,2008
10.1007/s00601-008-0274-y
null
nucl-th
null
Internucleon interactions evolved via flow equations yield soft potentials that lead to rapid variational convergence in few-body systems.
[ { "version": "v1", "created": "Sat, 24 Nov 2007 16:09:08 GMT" } ]
2009-01-16T00:00:00
[ [ "Furnstahl", "R. J.", "" ] ]
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711.3847
Tord Riemann
Stefano Actis (RWTH Aachen), Michal Czakon (U. Wuerzburg), Janusz Gluza (Silesian U. Katowice), Tord Riemann (DESY)
Virtual Hadronic and Leptonic Contributions to Bhabha Scattering
4 pages, 5 figures; v.2 with revised text version for PRL, results completely unchanged
Phys.Rev.Lett.100:131602,2008
10.1103/PhysRevLett.100.131602
DESY 07-205, PITHA 07/19, SFB/CPP-07-81, HEPTOOLS 07-036
hep-ph
null
Using dispersion relations, we derive the complete virtual QED contributions to Bhabha scattering due to vacuum polarization effects in photon propagation. We apply our result to hadronic corrections and to heavy lepton and top quark loop insertions. We give the first complete estimate of their net numerical effects for both small and large angle scattering at typical beam energies of meson factories, LEP, and the ILC. The effects turn out to be smaller, in most cases, than those corresponding to electron loop insertions, but stay, with amounts of typically one per mille, of relevance for precision experiments. Hadronic corrections themselves are typically about 2-3 times larger than those of intermediate muon pairs (the largest heavy leptonic terms).
[ { "version": "v1", "created": "Sat, 24 Nov 2007 16:11:58 GMT" }, { "version": "v2", "created": "Wed, 21 May 2008 17:00:16 GMT" } ]
2008-11-26T00:00:00
[ [ "Actis", "Stefano", "", "RWTH Aachen" ], [ "Czakon", "Michal", "", "U. Wuerzburg" ], [ "Gluza", "Janusz", "", "Silesian U. Katowice" ], [ "Riemann", "Tord", "", "DESY" ] ]
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711.3848
Alberto Sicilia
Alberto Sicilia, Jeferson J. Arenzon, Alan J. Bray, Leticia F. Cugliandolo
Geometric properties of two-dimensional coarsening with weak disorder
6 pages, 6 figures
EPL 82, 10001 (2008)
10.1209/0295-5075/82/10001
null
cond-mat.dis-nn cond-mat.stat-mech
null
The domain morphology of weakly disordered ferromagnets, quenched from the high-temperature phase to the low-temperature phase, is studied using numerical simulations. We find that the geometrical properties of the coarsening domain structure, e.g., the distributions of hull enclosed areas and domain perimeter lengths, are described by a scaling phenomenology in which the growing domain scale R(t) is the only relevant parameter. Furthermore, the scaling functions have forms identical to those of the corresponding pure system, extending the 'super-universality' property previously noted for the pair correlation function.
[ { "version": "v1", "created": "Mon, 26 Nov 2007 14:36:53 GMT" } ]
2009-11-13T00:00:00
[ [ "Sicilia", "Alberto", "" ], [ "Arenzon", "Jeferson J.", "" ], [ "Bray", "Alan J.", "" ], [ "Cugliandolo", "Leticia F.", "" ] ]
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711.3849
Dmitrii Zinoviev
Dmitrii Zinoviev
Relation of Orbital Integrals on SO(5) and PGL(2)
44 pages
Israel Journal of Mathematics, 106 (1998), pp. 29--78
null
null
math.RT
null
We relate the "Fourier" orbital integrals of corresponding spherical functions on the p-adic groups SO(5) and PGL(2). The correspondence is defined by a "lifting" of representations of these groups. This is a local "fundamental lemma" needed to compare the geometric sides of the global Fourier summation formulae (or relative trace formulae) on these two groups. This comparison leads to conclusions about a well known lifting of representations from PGL(2) to PGSp(4). This lifting produces counter examples to the Ramanujan conjecture.
[ { "version": "v1", "created": "Sat, 24 Nov 2007 17:39:49 GMT" } ]
2007-11-27T00:00:00
[ [ "Zinoviev", "Dmitrii", "" ] ]
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711.385
Sumanta Das
G.S.Agarwal, Sumanta Das
Electromagnetic Field Induced Modification of Branching Ratios for Emission in Structured Vacuum
7 pages, 6 figures, Submitted to New Journal of Physics
null
10.1088/1367-2630/10/1/013014
null
quant-ph
null
We report a fundamental effect of the electromagnetic field induced modification of the branching ratios for emission into several final states. The modifications are especially significant if the vacuum into which the atom is radiating has a finite spectral width comparable with the separation of the final states. This is easily realizable in cavity QED. Further our results are quite generic and are applicable to any system interacting with a structured reservoir.
[ { "version": "v1", "created": "Sat, 24 Nov 2007 17:54:51 GMT" } ]
2009-11-13T00:00:00
[ [ "Agarwal", "G. S.", "" ], [ "Das", "Sumanta", "" ] ]
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711.3851
Robert Milson
Robert Milson, Nicos Pelavas
The curvature homogeneity bound for Lorentzian four-manifolds
24 pages, streamlined version
null
null
null
gr-qc math.DG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We prove that a four-dimensional Lorentzian manifold that is curvature homogeneous of order 3, or CH_3 for short, is necessarily locally homogeneous. We also exhibit and classify four-dimensional Lorentzian, CH_2 manifolds that are not homogeneous. The resulting metrics belong to the class of null electromagnetic radiation, type N solutions on an anti-de Sitter background. These findings prove that the four-dimensional Lorentzian Singer number $k_{1,3}=3$, falsifying some recent conjectures by Gilkey. We also prove that invariant classification for these proper CH_2 solutions requires $\nabla^{(7)}R$, and that these are the unique metrics requiring the seventh order.
[ { "version": "v1", "created": "Sat, 24 Nov 2007 17:59:06 GMT" }, { "version": "v2", "created": "Mon, 10 Mar 2008 16:16:05 GMT" }, { "version": "v3", "created": "Sat, 21 Jun 2008 14:56:29 GMT" } ]
2008-06-21T00:00:00
[ [ "Milson", "Robert", "" ], [ "Pelavas", "Nicos", "" ] ]
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711.3852
Jean Bertoin
Jean Bertoin (DMA, Pma)
The structure of the allelic partition of the total population for Galton-Watson processes with neutral mutations
This version corrects a significant mistake in the first one
null
null
null
math.PR q-bio.PE
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We consider a (sub) critical Galton-Watson process with neutral mutations (infinite alleles model), and decompose the entire population into clusters of individuals carrying the same allele. We specify the law of this allelic partition in terms of the distribution of the number of clone-children and the number of mutant-children of a typical individual. The approach combines an extension of Harris representation of Galton-Watson processes and a version of the ballot theorem. Some limit theorems related to the distribution of the allelic partition are also given.
[ { "version": "v1", "created": "Sat, 24 Nov 2007 17:55:52 GMT" }, { "version": "v2", "created": "Tue, 1 Jan 2008 16:31:07 GMT" }, { "version": "v3", "created": "Fri, 28 Aug 2009 19:37:01 GMT" } ]
2009-08-28T00:00:00
[ [ "Bertoin", "Jean", "", "DMA, Pma" ] ]
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711.3853
Nathalie Picque
Julien Mandon (PPM), Evgeni Sorokin (TU WIEN), Irina T. Sorokina (NTNU), Guy Guelachvili (PPM), Nathalie Picqu\'e (PPM)
Supercontinua for high resolution absorption multiplex infrared spectroscopy
Optics Letters (2007) in press
Optics Letters 33, 3 (2008) 285-287
10.1364/OL.33.000285
null
physics.optics
null
Supercontinua generated in highly non-linear fibers by ultrashort-pulse lasers can be used for high resolution Fourier transform absorption spectroscopy. The practical advantages of these bright ultrabroadband light sources for spectroscopy are reported in the near-infrared region. A Cr^4+:YAG femtosecond laser broadened by an extruded soft-glass photonic crystal fiber, emitting from 1200 to 2200 nm and from 675 to 950 nm, provides a spectral radiance being 1x10^5 times higher than that of a 3000 K blackbody and 10^2 times higher than that of a synchrotron radiation. The C_2H_2 and NH_3 overtone spectra are recorded using this source within a few seconds.
[ { "version": "v1", "created": "Sat, 24 Nov 2007 17:57:55 GMT" } ]
2009-11-13T00:00:00
[ [ "Mandon", "Julien", "", "PPM" ], [ "Sorokin", "Evgeni", "", "TU WIEN" ], [ "Sorokina", "Irina T.", "", "NTNU" ], [ "Guelachvili", "Guy", "", "PPM" ], [ "Picqué", "Nathalie", "", "PPM" ] ]
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711.3854
Motohiko Kusakabe
Motohiko Kusakabe, Toshitaka Kajino, Richard N. Boyd, Takashi Yoshida and Grant J. Mathews
A Simultaneous Solution to the ^6Li and ^7Li Big Bang Nucleosynthesis Problems from a Long-Lived Negatively-Charged Leptonic Particle
6 pages, 2 figures, to be published in Physical Review D
Phys.Rev.D76:121302,2007
10.1103/PhysRevD.76.121302
null
astro-ph
null
The $^6$Li abundance observed in metal poor halo stars exhibits a plateau similar to that for $^7$Li suggesting a primordial origin. However, the observed abundance of $^6$Li is a factor of $10^3$ larger and that of $^7$Li is a factor of 3 lower than the abundances predicted in the standard big bang when the baryon-to-photon ratio is fixed by WMAP. Here we show that both of these abundance anomalies can be explained by the existence of a long-lived massive, negatively-charged leptonic particle during nucleosynthesis. Such particles would capture onto the synthesized nuclei thereby reducing the reaction Coulomb barriers and opening new transfer reaction possibilities, and catalyzing a second round of big bang nucleosynthesis. This novel solution to both of the Li problems can be achieved with or without the additional effects of stellar destruction.
[ { "version": "v1", "created": "Sat, 24 Nov 2007 17:59:05 GMT" } ]
2008-12-18T00:00:00
[ [ "Kusakabe", "Motohiko", "" ], [ "Kajino", "Toshitaka", "" ], [ "Boyd", "Richard N.", "" ], [ "Yoshida", "Takashi", "" ], [ "Mathews", "Grant J.", "" ] ]
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711.3855
Nathalie Picque
Herv\'e Herbin (PPM), Robert Farrenq (PPM), Guy Guelachvili (PPM), Nathalie Picqu\'e (PPM)
Concentration-modulation FT emission spectroscopy of TiCl_4/He plasma. Analysis of the C ^4\Delta- X ^4 \Phi \Delta v=0 perturbed transitions of TiCl
null
Dans Fourier Transform Spectroscopy/Hyperspectral Imaging and Sounding of the Environment Topical Meetings on CD-ROM - Alexandria, VA : \'Etats-Unis d'Am\'erique (2005)
null
null
physics.chem-ph physics.optics
null
A TiCl_4/He plasma is observed by high resolution double-modulation FTS using concentration-modulation as a selective detection method. Analysis of the C ^4\Delta- X ^4 \Phi \Delta v=0 transitions of ^48Ti^35Cl reveals perturbations affecting the C ^4\Delta_{1/2} sub-state.
[ { "version": "v1", "created": "Sat, 24 Nov 2007 18:01:44 GMT" } ]
2007-11-27T00:00:00
[ [ "Herbin", "Hervé", "", "PPM" ], [ "Farrenq", "Robert", "", "PPM" ], [ "Guelachvili", "Guy", "", "PPM" ], [ "Picqué", "Nathalie", "", "PPM" ] ]
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711.3856
Gusztav Morvai
Gusztav Morvai and Benjamin Weiss
Forward estimation for ergodic time series
null
Ann. Inst. H. Poincare Probab. Statist. 41 (2005), no. 5, 859--870
10.1016/j.anihpb.2004.07.002
null
math.PR cs.IT math.IT
null
The forward estimation problem for stationary and ergodic time series $\{X_n\}_{n=0}^{\infty}$ taking values from a finite alphabet ${\cal X}$ is to estimate the probability that $X_{n+1}=x$ based on the observations $X_i$, $0\le i\le n$ without prior knowledge of the distribution of the process $\{X_n\}$. We present a simple procedure $g_n$ which is evaluated on the data segment $(X_0,...,X_n)$ and for which, ${\rm error}(n) = |g_{n}(x)-P(X_{n+1}=x |X_0,...,X_n)|\to 0$ almost surely for a subclass of all stationary and ergodic time series, while for the full class the Cesaro average of the error tends to zero almost surely and moreover, the error tends to zero in probability.
[ { "version": "v1", "created": "Sat, 24 Nov 2007 19:03:29 GMT" } ]
2015-05-13T00:00:00
[ [ "Morvai", "Gusztav", "" ], [ "Weiss", "Benjamin", "" ] ]
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711.3857
Hacene Belbachir
Abdelhakim Aknouche, Fay\c{c}al Hamdi
Periodic Chandrasekhar recursions
null
null
null
null
stat.ME
null
This paper extends the Chandrasekhar-type recursions due to Morf, Sidhu, and Kailath "Some new algorithms for recursive estimation in constant, linear, discrete-time systems, IEEE Trans. Autom. Control 19 (1974) 315-323" to the case of periodic time-varying state-space models. We show that the S-lagged increments of the one-step prediction error covariance satisfy certain recursions from which we derive some algorithms for linear least squares estimation for periodic state-space models. The proposed recursions may have potential computational advantages over the Kalman Filter and, in particular, the periodic Riccati difference equation.
[ { "version": "v1", "created": "Sat, 24 Nov 2007 19:11:33 GMT" } ]
2007-11-27T00:00:00
[ [ "Aknouche", "Abdelhakim", "" ], [ "Hamdi", "Fayçal", "" ] ]
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711.3858
Motohiko Kusakabe
Motohiko Kusakabe, Toshitaka Kajino, Richard N. Boyd, Takashi Yoshida and Grant J. Mathews
The X^- Solution to the ^6Li and ^7Li Big Bang Nucleosynthesis Problems
18 pages, 7 figures, minor changes and references added, ApJ accepted
Astrophys. J. 680 (2008) 846
10.1086/588548
null
astro-ph
null
The $^6$Li abundance observed in metal poor halo stars appears to exhibit a plateau as a function of metallicity similar to that for $^7$Li, suggesting a big bang origin. However, the inferred primordial abundance of $^6$Li is $\sim$1000 times larger than that predicted by standard big bang nucleosynthesis for the baryon-to-photon ratio inferred from the WMAP data. Also, the inferred $^7$Li primordial abundance is 3 times smaller than the big bang prediction. We here describe in detail a possible simultaneous solution to both the problems of underproduction of $^6$Li and overproduction of $^7$Li in big bang nucleosynthesis. This solution involves a hypothetical massive, negatively-charged leptonic particle that would bind to the light nuclei produced in big bang nucleosynthesis, but would decay long before it could be detected. We consider only the $X$-nuclear reactions and assume that the effect of decay products is negligible, as would be the case if lifetime were large or the mass difference between the charged particle and its daughter were small. An interesting feature of this paradigm is that, because the particle remains bound to the existing nuclei after the cessation of the usual big bang nuclear reactions, a second longer epoch of nucleosynthesis can occur among $X$-nuclei. We confirm that reactions in which the hypothetical particle is transferred can occur that greatly enhance the production of $^6$Li while depleting $^7$Li. We also identify a new reaction that destroys large amounts of $^7$Be, and hence reduces the ultimate $^7$Li abundance. Thus, big-bang nucleosynthesis in the presence of these hypothetical particles, together with or without an event of stellar processing, can simultaneously solve the two Li abundance problems.
[ { "version": "v1", "created": "Sat, 24 Nov 2007 19:46:45 GMT" }, { "version": "v2", "created": "Mon, 24 Mar 2008 13:00:28 GMT" } ]
2013-03-21T00:00:00
[ [ "Kusakabe", "Motohiko", "" ], [ "Kajino", "Toshitaka", "" ], [ "Boyd", "Richard N.", "" ], [ "Yoshida", "Takashi", "" ], [ "Mathews", "Grant J.", "" ] ]
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711.3859
Dan Knopf
Dan Knopf
Convergence and stability of locally \mathbb{R}^{N}-invariant solutions of Ricci flow
The only revisions are improvements in exposition and notation. To appear in Journal of Geometric Analysis
null
null
null
math.DG math.AP
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Important models for immortal solutions of Ricci flow that collapse with bounded curvature come from locally G-invariant solutions on principal bundles, where G is a nilpotent Lie group. In this paper, we establish convergence and asymptotic stability, modulo smooth finite-dimensional center manifolds, of certain R^{N}-invariant solutions. When the dimension of the total space is three, these results are relevant to work of Lott classifying the asymptotic behavior of all 3-dimensional Ricci flow solutions whose sectional curvatures and diameters are respectively O(t^{-1}) and O(t^{1/2}).
[ { "version": "v1", "created": "Sat, 24 Nov 2007 22:04:33 GMT" }, { "version": "v2", "created": "Thu, 5 Mar 2009 22:55:31 GMT" } ]
2009-03-06T00:00:00
[ [ "Knopf", "Dan", "" ] ]
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711.386
Marco Frasca
Marco Frasca
K\"allen-Lehman Representation and the Gluon Propagator
4 pages, no figure. Numerical comparison with Aguilar and Natale results (hep-ph/0408254) is given showing exceptionally good agreement
null
null
null
hep-th
null
We exploit the Kallen-Lehman representation of the two-point Green function to prove that the gluon propagator cannot go to zero in the infrared limit. We are able to derive also the functional form of it. This means that current results on the lattice can be used to derive the scalar glueball spectrum to be compared both with experiments and different aimed lattice computations.
[ { "version": "v1", "created": "Sat, 24 Nov 2007 20:10:49 GMT" }, { "version": "v2", "created": "Tue, 27 Nov 2007 19:06:47 GMT" }, { "version": "v3", "created": "Sun, 2 Dec 2007 18:18:41 GMT" }, { "version": "v4", "created": "Tue, 15 Jan 2008 09:48:03 GMT" } ]
2008-01-15T00:00:00
[ [ "Frasca", "Marco", "" ] ]
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711.3861
Kamesh Munagala
Sudipto Guha, Kamesh Munagala and Peng Shi
Approximation Algorithms for Restless Bandit Problems
Merges two papers appearing in the FOCS '07 and SODA '09 conferences. This final version has been submitted for journal publication
null
null
null
cs.DS
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The restless bandit problem is one of the most well-studied generalizations of the celebrated stochastic multi-armed bandit problem in decision theory. In its ultimate generality, the restless bandit problem is known to be PSPACE-Hard to approximate to any non-trivial factor, and little progress has been made despite its importance in modeling activity allocation under uncertainty. We consider a special case that we call Feedback MAB, where the reward obtained by playing each of n independent arms varies according to an underlying on/off Markov process whose exact state is only revealed when the arm is played. The goal is to design a policy for playing the arms in order to maximize the infinite horizon time average expected reward. This problem is also an instance of a Partially Observable Markov Decision Process (POMDP), and is widely studied in wireless scheduling and unmanned aerial vehicle (UAV) routing. Unlike the stochastic MAB problem, the Feedback MAB problem does not admit to greedy index-based optimal policies. We develop a novel and general duality-based algorithmic technique that yields a surprisingly simple and intuitive 2+epsilon-approximate greedy policy to this problem. We then define a general sub-class of restless bandit problems that we term Monotone bandits, for which our policy is a 2-approximation. Our technique is robust enough to handle generalizations of these problems to incorporate various side-constraints such as blocking plays and switching costs. This technique is also of independent interest for other restless bandit problems. By presenting the first (and efficient) O(1) approximations for non-trivial instances of restless bandits as well as of POMDPs, our work initiates the study of approximation algorithms in both these contexts.
[ { "version": "v1", "created": "Sun, 25 Nov 2007 18:01:35 GMT" }, { "version": "v2", "created": "Fri, 11 Apr 2008 13:42:55 GMT" }, { "version": "v3", "created": "Sat, 12 Jul 2008 09:16:54 GMT" }, { "version": "v4", "created": "Tue, 27 Jan 2009 17:07:14 GMT" }, { "version": "v5", "created": "Tue, 3 Feb 2009 17:39:36 GMT" } ]
2009-02-03T00:00:00
[ [ "Guha", "Sudipto", "" ], [ "Munagala", "Kamesh", "" ], [ "Shi", "Peng", "" ] ]
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711.3862
Fei Han
Fei Han
Supersymmetric QFT, Super Loop Spaces and Bismut-Chern Character
26 pages, some materials added and some typos are corrected
null
null
null
math.DG math-ph math.MP
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper, we give a quantum interpretation of the Bismut-Chern character form (the loop space lifting of the Chern character form) as well as the Chern character form associated to a complex vector bundle with connection over a smooth manifold in the framework of supersymmetric quantum field theories developed by Stolz and Teichner \cite{ST07}. We show that the Bismut-Chern character form comes up via a loop-deloop process when one goes from $1|1$D theory over a manifold down to a $0|1$D theory over its free loop space. Based on our quantum interpretation of the Bismut-Chern character form and Chern character form, we construct Chern character type maps for SUSY QFTs.
[ { "version": "v1", "created": "Sat, 24 Nov 2007 22:44:39 GMT" }, { "version": "v2", "created": "Tue, 10 Jun 2008 09:19:43 GMT" }, { "version": "v3", "created": "Thu, 24 Jul 2008 06:43:35 GMT" } ]
2008-07-24T00:00:00
[ [ "Han", "Fei", "" ] ]
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711.3863
Lassina Dembele Ph. D
Lassina Dembele and Steve Donnelly
Computing Hilbert modular forms over fields with nontrivial class group
null
null
null
null
math.NT math.AG
null
In previous work, the first author developed an algorithm for the computation of Hilbert modular forms. In this paper, we extend this to all totally real number fields of even degree and nontrivial class group. Using the algorithm over $\Q(\sqrt{10})$ and $\Q(\sqrt{85})$ and their Hilbert class fields, we present some new instances of the conjectural Eichler-Shimura construction for totally real fields, and in particular find new examples of modular abelian varieties with everywhere good reduction.
[ { "version": "v1", "created": "Mon, 26 Nov 2007 16:24:10 GMT" } ]
2007-11-27T00:00:00
[ [ "Dembele", "Lassina", "" ], [ "Donnelly", "Steve", "" ] ]
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711.3864
Ehud Hrushovski
Zo\'e Chatzidakis, Ehud Hrushovski
Difference fields and descent in algebraic dynamics - I
Revised version
null
null
null
math.LO math.AG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We draw a connection between the model-theoretic notions of modularity (or one-basedness), orthogonality and internality, as applied to difference fields, and questions of descent in in algebraic dynamics. In particular we prove in any dimension a strong dynamical version of Northcott's theorem for function fields, answering a question of Szpiro and Tucker and generalizing a theorem of Baker's for the projective line. The paper comes in three parts. This first part contains an exposition some of the main results of the model theory of difference fields, and their immediate connection to questions of descent in algebraic dynamics. We present the model-theoretic notion of internality in a context that does not require a universal domain with quantifier-elimination. We also note a version of canonical heights that applies well beyond polarized algebraic dynamics. Part II sharpens the structure theory to arbitrary base fields and constructible maps where in part I we emphasize finite base change and correspondences. Part III will include precise structure theorems related to the Galois theory considered here, and will enable a sharpening of the descent results for non-modular dynamics.
[ { "version": "v1", "created": "Sat, 24 Nov 2007 22:05:52 GMT" }, { "version": "v2", "created": "Fri, 4 Jul 2008 15:41:53 GMT" } ]
2008-07-04T00:00:00
[ [ "Chatzidakis", "Zoé", "" ], [ "Hrushovski", "Ehud", "" ] ]
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711.3865
Ehud Hrushovski
Zo\'e Chatzidakis, Ehud Hrushovski
Difference fields and descent in algebraic dynamics, II
Revised version; some corrections related to purely inseparable descent, with thanks to referee
null
null
null
math.LO math.AG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This second part of the paper strengthens the descent theory described in the first part to rational maps, arbitrary base fields, and dynamics given by correspondences. We obtain in particular a decomposition of any difference field extension into a tower of finite, field-internal and one-based difference field extensions. This is needed in order to obtain the "dynamical Northcott" Theorem 1.11 of Part I in sharp form.
[ { "version": "v1", "created": "Sat, 24 Nov 2007 22:18:38 GMT" }, { "version": "v2", "created": "Fri, 4 Jul 2008 16:19:30 GMT" } ]
2008-07-04T00:00:00
[ [ "Chatzidakis", "Zoé", "" ], [ "Hrushovski", "Ehud", "" ] ]
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711.3866
Jungsang Kim
Jungsang Kim and Changsoon Kim
Integrated Optical Approach to Trapped Ion Quantum Computation
22 pages, 8 figures
Quant. Inf. Comput. Vol 9, No 2. (2009)
null
null
quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Recent experimental progress in quantum information processing with trapped ions have demonstrated most of the fundamental elements required to realize a scalable quantum computer. The next set of challenges lie in realization of a large number of qubits and the means to prepare, manipulate and measure them, leading to error-protected qubits and fault tolerant architectures. The integration of qubits necessarily require integrated optical approach as most of these operations involve interaction with photons. In this paper, we discuss integrated optics technologies and concrete optical designs needed for the physical realization of scalable quantum computer.
[ { "version": "v1", "created": "Sat, 24 Nov 2007 23:14:58 GMT" }, { "version": "v2", "created": "Mon, 15 Dec 2008 18:43:56 GMT" } ]
2008-12-15T00:00:00
[ [ "Kim", "Jungsang", "" ], [ "Kim", "Changsoon", "" ] ]
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711.3867
Yi Sun
Yi Sun
A Family of Likelihood Ascent Search Multiuser Detectors: Approach to Single-User Performance via Quasi-Large Random Sequence CDMA
null
null
null
null
cs.IT math.IT
null
Since Tse and Verdu proved that the global maximum likelihood (GML) detector achieves unit asymptotic multiuser efficiency (AME) in the limit of large random spreading (LRS) CDMA, no suboptimal detector has been found to achieve unit AME. In this letter, we obtain that the WSLAS detector with a linear per-bit complexity achieves unit AME in the LRS-CDMA with a channel load < 1/2 - 1/(4ln2) bits/s/Hz. For a practical system with any user number, a quasi LRS-CDMA is then proposed to approach the single-user performance in the high SNR regime.
[ { "version": "v1", "created": "Sat, 24 Nov 2007 23:59:34 GMT" } ]
2007-11-27T00:00:00
[ [ "Sun", "Yi", "" ] ]
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711.3868
Chung-Sang Ng
C. S. Ng (1), D. Rosenberg (2), K. Germaschewski (1), A. Pouquet (2) and A. Bhattacharjee (1) ((1) Space Science Center, University of New Hampshire, Durham, NH, (2) TNT/IMAGe, National Center for Atmospheric Research, Boulder, CO)
A comparison of spectral element and finite difference methods using statically refined nonconforming grids for the MHD island coalescence instability problem
19 pages, 17 figures, submitted to Astrophys. J. Suppl
Astrophys.J.Suppl.177:613,2008
10.1086/588139
null
physics.comp-ph astro-ph.EP astro-ph.SR physics.plasm-ph physics.space-ph
null
A recently developed spectral-element adaptive refinement incompressible magnetohydrodynamic (MHD) code [Rosenberg, Fournier, Fischer, Pouquet, J. Comp. Phys. 215, 59-80 (2006)] is applied to simulate the problem of MHD island coalescence instability (MICI) in two dimensions. MICI is a fundamental MHD process that can produce sharp current layers and subsequent reconnection and heating in a high-Lundquist number plasma such as the solar corona [Ng and Bhattacharjee, Phys. Plasmas, 5, 4028 (1998)]. Due to the formation of thin current layers, it is highly desirable to use adaptively or statically refined grids to resolve them, and to maintain accuracy at the same time. The output of the spectral-element static adaptive refinement simulations are compared with simulations using a finite difference method on the same refinement grids, and both methods are compared to pseudo-spectral simulations with uniform grids as baselines. It is shown that with the statically refined grids roughly scaling linearly with effective resolution, spectral element runs can maintain accuracy significantly higher than that of the finite difference runs, in some cases achieving close to full spectral accuracy.
[ { "version": "v1", "created": "Sun, 25 Nov 2007 00:16:56 GMT" } ]
2011-08-31T00:00:00
[ [ "Ng", "C. S.", "" ], [ "Rosenberg", "D.", "" ], [ "Germaschewski", "K.", "" ], [ "Pouquet", "A.", "" ], [ "Bhattacharjee", "A.", "" ] ]
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711.3869
Yi Sun
Yi Sun
A Family of Likelihood Ascent Search Multiuser Detectors: an Upper Bound of Bit Error Rate and a Lower Bound of Asymptotic Multiuser Efficiency
To appear in IEEE Trans. on Communications
null
10.1109/TCOMM.2009.06.060400
null
cs.IT math.IT
null
In this paper, the bit error performance of a family of likelihood ascent search (LAS) multiuser detectors is analyzed. An upper bound on the BER of any LAS detector is obtained by bounding the fixed point region with the worst initial detector. The concept of indecomposable errors developed by Verdu is applied to tighten the upper bound. In a special instance, the upper bound is reduced to that for all the local maximum likelihood detectors. The upper bound is comparable with that of the optimum detector obtained by Verdu. A lower bound on the asymptotic multiuser efficiency (AME) is then obtained. It is shown that there are nontrivial CDMA channels such that a LAS detector can achieve unit AME regardless of user number. The AME lower bound provides a means for further seeking a good set of spreading sequences and power distribution for spectral and power efficient CDMA.
[ { "version": "v1", "created": "Sun, 25 Nov 2007 00:21:31 GMT" }, { "version": "v2", "created": "Tue, 29 Jan 2008 20:44:24 GMT" } ]
2016-11-15T00:00:00
[ [ "Sun", "Yi", "" ] ]
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711.387
Joe Perez
Joe J. Perez
The G-Fredholm Property of the \bar\partial-Neumann Problem
19 pages
J. Geom. Anal., (2009) 19: 87-106
null
null
math.CV math.AP
null
Let $G$ be a unimodular Lie group, $X$ a compact manifold with boundary, and $M$ be the total space of a principal bundle $G\to M\to X$ so that $M$ is also a strongly pseudoconvex complex manifold. In this work, we show that if $G$ acts by holomorphic transformations in $M$, then the complex Laplacian $\square$ on $M$ has the following properties: The kernel of $\square$ restricted to the forms $\Lambda^{p,q}$ with $q$ positive is a closed, $G$-invariant subspace in $L^{2}(M,\Lambda^{p,q})$ of finite $G$-dimension. Secondly, we show that if $q$ is positive, then the image of $\square$ contains a closed, $G$-invariant subspace of finite codimension in $L^{2}(M,\Lambda^{p,q})$. These two properties taken together amount to saying that $\square$ is a $G$-Fredholm operator. The boundary Laplacian has similar properties.
[ { "version": "v1", "created": "Sun, 25 Nov 2007 00:59:56 GMT" }, { "version": "v2", "created": "Mon, 3 Dec 2007 04:01:55 GMT" } ]
2009-09-08T00:00:00
[ [ "Perez", "Joe J.", "" ] ]
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711.3871
Alexander Kelmans
Alexander Kelmans
Packing 3-Vertex Paths in Claw-Free Graphs
12 pages
null
null
RUTCOR Research Report 24-2007, Rutgers University (2007)
math.CO
null
An L-factor of a graph G is a spanning subgraph of G whose every component is a 3-vertex path. Let v(G) denote the number of vertices of G. A graph is called claw-free if it does not have a subgraph isomorphic to the graph with 4 vertices and 3 edges having a common vertex. Our results include the following. Let G$ be a 3-connected claw-free graph, x be a vertex, e = xy be an edge, and P be a 3-vertex path in G. Then (c1) if v(G) = 0 mod 3, then G has an L-factor containing (avoiding) e, (c2) if v(G) = 1 mod 3, then G - x has a L-factor, (c3) if v(G) = 2 mod 3, then G - x -y has an L-factor, (c4) if v(G) = 0 mod 3 and G is either cubic or 4-connected, then G - P has an L-factor, and (c5) if G is cubic and E is a set of three edges in G, then G - E has an L -factor if and only if the subgraph induced by E in G is not a claw and not a triangle. Keywords: claw-free graph, cubic graph, L-packing, L-factor.
[ { "version": "v1", "created": "Sun, 25 Nov 2007 01:47:10 GMT" } ]
2007-11-27T00:00:00
[ [ "Kelmans", "Alexander", "" ] ]
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711.3872
Stephen Morris
Nicolas Taberlet, Stephen W. Morris and Jim N. McElwaine
Washboard Road: The dynamics of granular ripples formed by rolling wheels
5 pages 5 figures
Physical Review Letters, 99, 068003 (2007)
10.1103/PhysRevLett.99.068003
null
nlin.PS cond-mat.soft nlin.CD physics.pop-ph
null
Granular surfaces tend to develop lateral ripples under the action of surface forces exerted by rolling wheels, an effect known as washboard or corrugated road. We report the results of both laboratory experiments and soft-particle direct numerical simulations. Above a critical speed, the ripple pattern appears as small patches of traveling waves which eventually spread to the entire circumference. The ripples drift slowly in the driving direction. Interesting secondary dynamics of the saturated ripples were observed, as well as various ripple creation and destruction events. All of these effects are captured qualitatively by 2D soft particle simulations in which a disk rolls over a bed of poly-disperse particles in a periodic box. These simulations show that compaction and segregation are inessential to the ripple phenomenon. We also discuss a simplified scaling model which gives some insight into the mechanism of the instability.
[ { "version": "v1", "created": "Sun, 25 Nov 2007 02:11:03 GMT" } ]
2009-11-13T00:00:00
[ [ "Taberlet", "Nicolas", "" ], [ "Morris", "Stephen W.", "" ], [ "McElwaine", "Jim N.", "" ] ]
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711.3873
Nick Crawford
Nicholas Crawford
The Interaction Between Multi-Overlaps in the High Temperature Phase of the Sherrington-Kirkpatrick Spin Glass
30 pages, Added References
null
10.1063/1.2966275
null
math.PR math-ph math.MP
null
We explore the joint behavior of a finite number of multi-overlaps in the high temperature phase of the SK model. Extending work by M. Talagrand, we show that, when these objects are scaled to have non-trivial limiting distributions, the joint behavior is described by a Gaussian process with an explicit covariance structure.
[ { "version": "v1", "created": "Mon, 26 Nov 2007 16:32:09 GMT" }, { "version": "v2", "created": "Wed, 28 Nov 2007 03:57:10 GMT" }, { "version": "v3", "created": "Thu, 10 Apr 2008 03:23:06 GMT" } ]
2009-11-13T00:00:00
[ [ "Crawford", "Nicholas", "" ] ]
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711.3874
Stephen Morris
Stephen W. Morris, Jonathan H. P. Dawes, Neil M. Ribe and John R. Lister
The meandering instability of a viscous thread
12 pages, 9 figures, revised, resubmitted to Physical Review E
null
10.1103/PhysRevE.77.066218
null
physics.flu-dyn math.DS nlin.PS physics.class-ph
null
A viscous thread falling from a nozzle onto a surface exhibits the famous rope-coiling effect, in which the thread buckles to form loops. If the surface is replaced by a belt moving with speed $U$, the rotational symmetry of the buckling instability is broken and a wealth of interesting states are observed [See S. Chiu-Webster and J. R. Lister, J. Fluid Mech., {\bf 569}, 89 (2006)]. We experimentally studied this "fluid mechanical sewing machine" in a new, more precise apparatus. As $U$ is reduced, the steady catenary thread bifurcates into a meandering state in which the thread displacements are only transverse to the motion of the belt. We measured the amplitude and frequency $\omega$ of the meandering close to the bifurcation. For smaller $U$, single-frequency meandering bifurcates to a two-frequency "figure eight" state, which contains a significant $2\omega$ component and parallel as well as transverse displacements. This eventually reverts to single-frequency coiling at still smaller $U$. More complex, highly hysteretic states with additional frequencies are observed for larger nozzle heights. We propose to understand this zoology in terms of the generic amplitude equations appropriate for resonant interactions between two oscillatory modes with frequencies $\omega$ and $2\omega$. The form of the amplitude equations captures both the axisymmetry of the U=0 coiling state and the symmetry-breaking effects induced by the moving belt.
[ { "version": "v1", "created": "Sun, 25 Nov 2007 03:14:03 GMT" }, { "version": "v2", "created": "Wed, 21 May 2008 14:55:58 GMT" } ]
2009-11-13T00:00:00
[ [ "Morris", "Stephen W.", "" ], [ "Dawes", "Jonathan H. P.", "" ], [ "Ribe", "Neil M.", "" ], [ "Lister", "John R.", "" ] ]
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711.3875
Robert Grossman
Robert L. Grossman and Richard G. Larson
An Overview of Hopf Algebras of Trees and Their Actions on Functions
null
null
null
null
math.RA math.CO
null
We provide an expository account of some of the Hopf algebras that can be defined using trees, labeled trees, ordered trees and heap ordered trees. We also describe some actions of these Hopf algebras on algebra of functions.
[ { "version": "v1", "created": "Sun, 25 Nov 2007 03:24:00 GMT" } ]
2007-11-27T00:00:00
[ [ "Grossman", "Robert L.", "" ], [ "Larson", "Richard G.", "" ] ]
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711.3876
Sergio Coutinho
P. H. Figueiredo, M. A. Moret, E. Nogueira Jr. and S. Coutinho
Dihedral-angle Gaussian distribution driving protein folding
9 pages, 4 figures, to be published in Physica A
null
10.1016/j.physa.2007.11.034
null
physics.bio-ph
null
The proposal of this paper is to provide a simple angular random walk model to build up polypeptide structures, which encompass properties of dihedral angles of folded proteins. From this model, structures will be built with lengths ranging from 125 up to 400 amino acids for the different fractions of secondary structure motifs, which dihedral angles were randomly chosen according to narrow Gaussian probability distributions. In order to measure the fractal dimension of proteins three different cases were analyzed. The first contained alpha-helix structures only, the second beta-strands structures and the third a mix of alpha-helices and beta-sheets. The behavior of proteins with alpha-helix motifs are more compacted than in other situations. The findings herein indicate that this model describes some structural properties of a protein and suggest that randomness is an essential ingredient but proteins are driven by narrow angular Gaussian probability distributions and not by random-walk processes.
[ { "version": "v1", "created": "Sun, 25 Nov 2007 03:40:47 GMT" } ]
2009-11-13T00:00:00
[ [ "Figueiredo", "P. H.", "" ], [ "Moret", "M. A.", "" ], [ "Nogueira", "E.", "Jr." ], [ "Coutinho", "S.", "" ] ]
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711.3877
Richard Larson
R. L. Grossman, R. G. Larson
Hopf-algebraic structures of families of trees
29 pages
J. Algebra, 126 (1989), 184-210
null
null
math.RA math.CO
null
Description of cocommutative Hopf algebras associated with families of trees. Applications include Cayley's theorem on the number of rooted trees with n nodes, and Catalan's theorem on the number of rooted ordered trees with n nodes.
[ { "version": "v1", "created": "Sun, 25 Nov 2007 04:01:02 GMT" } ]
2007-11-27T00:00:00
[ [ "Grossman", "R. L.", "" ], [ "Larson", "R. G.", "" ] ]
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711.3878
Chandan Singh Dalawat
Chandan Singh Dalawat
Local discriminants, kummerian extensions, and elliptic curves
null
Journal of the Ramanujan Mathematical Society, {\bf 25} (2010) 1, pp.~25--80.
null
null
math.NT math.AC
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Some thoughts on the congruence D=0,1(mod 4) for the absolute discriminant D of a number field
[ { "version": "v1", "created": "Sun, 25 Nov 2007 04:02:55 GMT" }, { "version": "v2", "created": "Fri, 12 Mar 2010 10:26:20 GMT" } ]
2010-03-15T00:00:00
[ [ "Dalawat", "Chandan Singh", "" ] ]
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711.3879
Chandan Singh Dalawat
Chandan Singh Dalawat
Wilson's theorem
null
Journal de Th{\'e}orie des nombres de Bordeaux 21 (2009) 3, 517--521
null
null
math.NT math.HO
null
We show that there are four possibilities for the product of all elements in the multiplicative group of a quotient of the ring of integers in a number field, and give precise conditions for each of the possibilities to occur. This generalisation of Wilson's theorem turns out to have been first discovered by M. La\v{s}\v{s}\'ak (2000), but our proof is simpler and more direct.
[ { "version": "v1", "created": "Sun, 25 Nov 2007 04:07:05 GMT" } ]
2013-01-09T00:00:00
[ [ "Dalawat", "Chandan Singh", "" ] ]
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711.388
Tadashi Yoshikawa
C.S. Kim, Tadashi Yoshikawa
Systematic Analysis of B --> K pi l^+ l^- Decay through Angular Decomposition
26 pages, 7 figures, Update references
null
null
null
hep-ph
null
We investigate systematically how to extract new physics contributions in B --> K pi l^+ l^- decay by using the angular decomposition. The decomposition will enable us to define not only several CP averaged forward-backward (FB) asymmetries but also the direct CP asymmetry and the time-dependent mixing induced CP asymmetry for each FB asymmetry newly defined in the general 4 body angular space. The decay process involves several intermediate vector and scalar resonances as sources of strong phase difference through interference, therefore, one can expect largely enhanced CP asymmetries, if there exists any new physics with weak CP phases. The combined analysis of the FB and CP asymmetries will give us fruitful information about new physics contributions in detail.
[ { "version": "v1", "created": "Sun, 25 Nov 2007 04:18:48 GMT" }, { "version": "v2", "created": "Tue, 4 Dec 2007 10:05:27 GMT" } ]
2007-12-04T00:00:00
[ [ "Kim", "C. S.", "" ], [ "Yoshikawa", "Tadashi", "" ] ]
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711.3881
Qing-Hong Cao
Qing-Hong Cao, Ernest Ma, Jose Wudka, C.-P. Yuan
Multipartite Dark Matter
references added
null
null
UCRHEP-T443
hep-ph astro-ph
null
Dark matter (comprising a quarter of the Universe) is usually assumed to be due to one and only one weakly interacting particle which is neutral and absolutely stable. We consider the possibility that there are several coexisting dark-matter particles, and explore in some detail the generic case where there are two. We discuss how the second dark-matter particle may relax the severe constraints on the parameter space of the Minimal Supersymmetric Standard Model, as well as other verifiable predictions in both direct and indirect search experiments.
[ { "version": "v1", "created": "Sun, 25 Nov 2007 05:23:05 GMT" }, { "version": "v2", "created": "Mon, 3 Dec 2007 03:41:31 GMT" } ]
2007-12-03T00:00:00
[ [ "Cao", "Qing-Hong", "" ], [ "Ma", "Ernest", "" ], [ "Wudka", "Jose", "" ], [ "Yuan", "C. -P.", "" ] ]
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711.3882
Hosho Katsura
Hosho Katsura, Takaaki Hirano, Vladimir E. Korepin
Entanglement in an SU(n) Valence-Bond-Solid State
16 pages, 2 figures; one reference added
J. Phys. A:Math & Theor. 41, 135304(2008).
10.1088/1751-8113/41/13/135304
null
quant-ph cond-mat.stat-mech math-ph math.MP
null
We investigate entanglement properties in the ground state of the open/periodic SU($n$) generalized valence-bond-solid state consisting of representations of SU($n$). We obtain exact expression for the reduced density matrix of a block of contiguous spins and explicitly evaluate the von Neumann and the R\'enyi entropies. We discover that the R\'enyi entropy is independent of the parameter $\alpha$ in the limit of large block sizes and its value $2 \log n$ coincides with that of von Neumann entropy. We also find the direct relation between the reduced density matrix of the subsystem and edge states for the corresponding open boundary system.
[ { "version": "v1", "created": "Sun, 25 Nov 2007 07:14:14 GMT" }, { "version": "v2", "created": "Fri, 28 Dec 2007 11:48:57 GMT" } ]
2008-04-03T00:00:00
[ [ "Katsura", "Hosho", "" ], [ "Hirano", "Takaaki", "" ], [ "Korepin", "Vladimir E.", "" ] ]
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711.3883
Hakim Boumaza
Boumaza Hakim
Positivit\'e des exposants de Lyapounov pour un op\'erateur de Schr\"odinger continu \`a valeurs matricielles
null
null
null
null
math-ph math.MP
null
In this note, we study a continuous matrix-valued Anderson-type model. Both leading Lyapounov exponents of this model are proved to be positive and distincts for all energies in $(2,+\infty)$ except those in a discrete set, which leads to absence of absolutely continuous spectrum in $(2,+\infty)$. The methods, using group theory results by Breuillard and Gelander, allow for singular Bernoulli distributions.
[ { "version": "v1", "created": "Sun, 25 Nov 2007 08:39:57 GMT" } ]
2007-11-27T00:00:00
[ [ "Hakim", "Boumaza", "" ] ]
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711.3884
Surajit Sen
Mihir Ranjan Nath, Surajit Sen and Gautam Gangopadhyay
Dynamics of cascade three-level system interacting with the classical and quantized field
10 pages, 5 Figures
Pramana-Journal of Physics Vol. 61, No. 6, 1089 (2003)
null
null
quant-ph
null
We study the exact solutions of the cascade three-level atom interacting with a single mode classical and quantized field with different initial conditions of the atom. For the semiclassical model, it is found that if the atom is initially in the middle level, the time dependent populations of the upper and lower levels are always equal. This dynamical symmetry exhibited by the classical field is spoiled on quantization of the field mode. To reveal this nonclassical effect an Euler matrix formalism is developed to solve the dressed states of the cascade Jaynes-Cummings model (JCM). Possible modification of such effect on the collapse and revival phenomenon is also discussed by taking the quantized field in a coherent state.
[ { "version": "v1", "created": "Sun, 25 Nov 2007 07:05:54 GMT" } ]
2007-11-27T00:00:00
[ [ "Nath", "Mihir Ranjan", "" ], [ "Sen", "Surajit", "" ], [ "Gangopadhyay", "Gautam", "" ] ]
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711.3885
Masahiro Yanagisawa
Masahiro Yanagisawa
Quantum smoothing
9 pages
null
null
null
quant-ph
null
Quantum initial state estimation through entanglement and continuous measurement is introduced. This paper provides a unified formulation of classical and quantum smoothing and shows a smoothing uncertainty relation. As an example, a communication between two parties via a two mode squeezed state is shown.
[ { "version": "v1", "created": "Sun, 25 Nov 2007 07:14:25 GMT" }, { "version": "v2", "created": "Thu, 6 Dec 2007 11:46:58 GMT" } ]
2007-12-06T00:00:00
[ [ "Yanagisawa", "Masahiro", "" ] ]
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711.3886
Tsutomu Takayama
Toshihiro Kawaguchi, Masahiro Kawasaki, Tsutomu Takayama, Masahide Yamaguchi, Jun'ichi Yokoyama
Formation of intermediate-mass black holes as primordial black holes in the inflationary cosmology with running spectral index
7 pages, 4 figures
Mon.Not.Roy.Astron.Soc.388:1426-1432,2008
10.1111/j.1365-2966.2008.13523.x
null
astro-ph hep-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Formation of primordial black holes (PBHs) on astrophysical mass scales is a natural consequence of inflationary cosmology if the primordial perturbation spectrum has a large and negative running of the spectral index as observationally inferred today, because double inflation is required to explain it and fluctuations on some astrophysical scales are enhanced in the field oscillation regime in between. It is argued that PBHs thus produced can serve as intermediate-mass black holes (IMBHs) which act as the observed ultraluminous X-ray sources (ULXs) by choosing appropriate values of the model parameters in their natural ranges. Our scenario can be observationally tested in near future because the mass of PBHs is uniquely determined once we specify the values of the spectral index and its running on large scales.
[ { "version": "v1", "created": "Sun, 25 Nov 2007 07:30:23 GMT" }, { "version": "v2", "created": "Thu, 21 Aug 2008 08:23:40 GMT" } ]
2009-06-23T00:00:00
[ [ "Kawaguchi", "Toshihiro", "" ], [ "Kawasaki", "Masahiro", "" ], [ "Takayama", "Tsutomu", "" ], [ "Yamaguchi", "Masahide", "" ], [ "Yokoyama", "Jun'ichi", "" ] ]
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711.3887
Omar Mustafa
Omar Mustafa
Spherical-separablility of non-Hermitian Dirac Hamiltonians and pseudo-PT-symmetry
This paper has been withdrawn for its now combined with 0710.5814 to form 0801.3572
null
10.1007/s10773-008-9794-y
null
quant-ph
null
A non-Hermitian P$_{\phi}$T$_{\phi}$-symmetrized spherically-separable Dirac Hamiltonian is considered. It is observed that the descendant Hamiltonians H$_{r}$, H$_{\theta}$, and H$_{\phi}$ play essential roles and offer some user-feriendly options as to which one (or ones) of them is (or are) non-Hermitian. Considering a P$_{\phi}$T$_{\phi}$-symmetrized H$_{\phi}$, we have shown that the conventional relativistic energy eigenvalues are recoverable. We have also witnessed an unavoidable change in the azimuthal part of the general wavefunction. Moreover, setting a possible interaction $V(\theta)$=0 in the descendant Hamiltonian H$_{\theta}$ would manifest a change in the angular $\theta$-dependent part of the general solution too. Whilst some P$_{\phi}$T$_{\phi}$-symmetrized H$_{\phi}$ Hamiltonians are considered, a recipe to keep the regular magnetic quantum number m, as defined in the regular traditional Hermitian settings, is suggested. Hamiltonians possess properties similar to the PT-symmetric ones (here the non-Hermitian
[ { "version": "v1", "created": "Sun, 25 Nov 2007 07:34:23 GMT" }, { "version": "v2", "created": "Thu, 24 Jan 2008 09:37:26 GMT" } ]
2009-11-13T00:00:00
[ [ "Mustafa", "Omar", "" ] ]
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711.3888
Tetsuya Takaishi
Tetsuya Takaishi, Atsushi Nakamura
Simulations of one-flavor QCD at finite temperature by RHMC
7 pages, Presented at the XXV International Symposium on Lattice Field Theory, July 30 - August 4 2007, Regensburg, Germany
PoSLAT2007:229,2007
null
null
hep-lat
null
We simulate one-flavor QCD with standard Wilson fermions at finite temperature by the rational hybrid Monte Carlo algorithm. In the heavy quark region when we decrease the quark mass there is an endpoint which terminates the first order phase transition. We try to locate it by calculating the Binder cumulant of the Polyakov loop norm. We estimate the end-point to be kappa_c \sim 0.07-0.08.
[ { "version": "v1", "created": "Sun, 25 Nov 2007 08:21:11 GMT" } ]
2008-11-26T00:00:00
[ [ "Takaishi", "Tetsuya", "" ], [ "Nakamura", "Atsushi", "" ] ]
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711.3889
Hakim Boumaza
Boumaza Hakim
H\"older continuity of the IDS for matrix-valued Anderson models
null
Rev. Math. Phys. 20(7). 873-900 (2008)
10.1142/S0129055X08003456
null
math-ph math.MP
null
We study a class of continuous matrix-valued Anderson models acting on $L^{2}(\R^{d})\otimes \C^{N}$. We prove the existence of their Integrated Density of States for any $d\geq 1$ and $N\geq 1$. Then for $d=1$ and for arbitrary $N$, we prove the H\"older continuity of the Integrated Density of States under some assumption on the group $G_{\mu_{E}}$ generated by the transfer matrices associated to our models. This regularity result is based upon the analoguous regularity of the Lyapounov exponents associated to our model, and a new Thouless formula which relates the sum of the positive Lyapounov exponents to the Integrated Density of States. In the final section, we present an example of matrix-valued Anderson model for which we have already proved, in a previous article, that the assumption on the group $G_{\mu_{E}}$ is verified. Therefore the general results developed here can be applied to this model.
[ { "version": "v1", "created": "Sun, 25 Nov 2007 08:43:20 GMT" }, { "version": "v2", "created": "Fri, 30 Nov 2007 09:33:33 GMT" } ]
2008-09-19T00:00:00
[ [ "Hakim", "Boumaza", "" ] ]
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711.389
Alessandro Verra
Alessandro Verra
On the universal abelian variety of dimension 4
Referee's version, appearing on Contemporary Math. vol. 465 (2008)
null
null
null
math.AG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Let A be the moduli space of principally polarized abelian varieties of dimension 4 over an algebraically closed field k of characteristic different from 2,3. It is proved that the universal principally polarized abelian variety over A, as well as the universal theta divisor over A, are unirational varieties.
[ { "version": "v1", "created": "Sun, 25 Nov 2007 20:13:34 GMT" }, { "version": "v2", "created": "Fri, 8 Aug 2008 21:23:03 GMT" } ]
2008-08-09T00:00:00
[ [ "Verra", "Alessandro", "" ] ]
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711.3891
Yu-Feng Zhou
Yue-Liang Wu and Yu-Feng Zhou
A Two Higgs Bi-doublet Left-Right Model With Spontaneous CP Violation
Talk at 4th International Conference on Flavor Physics (ICFP 2007), Beijing, China, 24-28 Sep 2007
Int.J.Mod.Phys.A23:3304-3308,2008
10.1142/S0217751X0804202X
null
hep-ph
null
We discuss a left-right symmetric model with two Higgs bi-doublet and spontaneous P and CP violation. The flavor changing neutral currents is suppressed by assuming approximate global U(1) family symmetry. We calculate the constraints from neural K meson mass difference \Delta m_K and demonstrate that a right-handed gauge boson W_2 contribution in box-diagrams with mass around 600 GeV is allowed due to a negative interference with a light charged Higgs boson around 150 \sim 300 GeV. The W_2 contribution to \epsilon_K is suppressed from appropriate choice of additional CP phases appearing in the right-handed Cabbibo-Kobayashi-Maskawa(CKM) matrix. The model is found fully consistent with B^0 mass difference and the mixing-induced CP asymmetry measurements.
[ { "version": "v1", "created": "Sun, 25 Nov 2007 09:43:08 GMT" } ]
2008-11-26T00:00:00
[ [ "Wu", "Yue-Liang", "" ], [ "Zhou", "Yu-Feng", "" ] ]
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711.3892
Bau-Sen Du
Bau-Sen Du
A Simple Proof of Sharkovsky's Theorem Rerevisited
28 pages, 5 figures, In this revision, we replace a detailed proof of (a), (b) and (c) in section 3 and a detailed proof of Sharkovsky's theorem in section 11. arXiv admin note: substantial text overlap with arXiv:math/0703592
null
null
null
math.DS
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Based on various strategies and a new general doubling operator, we obtain several simple proofs of the celebrated Sharkovsky's cycle coexistence theorem. A simple non-directed graph proof which is especially suitable for a calculus course right after the introduction of Intermediate Value Theorem is also given (in section 3).
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2015-04-13T00:00:00
[ [ "Du", "Bau-Sen", "" ] ]
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711.3893
Kamuran Saygili
K. Saygili
Topologically Massive Abelian Gauge Theory
31 pages, latex
Int.J.Mod.Phys.A23:2015-2035,2008
10.1142/S0217751X08039840
null
hep-th
null
We discuss three mathematical structures which arise in topologically massive abelian gauge theory. First, the euclidean topologically massive abelian gauge theory defines a contact structure on a manifold. We briefly discuss three solutions and the related contact structures on the flat 3-torus, the AdS space, the 3-sphere which respectively correspond to Bianchi type I, VIII, IX spaces. We also present solutions on Bianchi type II, VI and VII spaces. Secondly, we discuss a family of complex (anti-)self-dual solutions of the euclidean theory in cartesian coordinates on R3 which are given by (anti-)holomorpic functions. The orthogonality relation of contact structures which are determined by the real parts of these complex solutions separates them into two classes: the self-dual and the anti-self-dual solutions. Thirdly, we apply the curl transformation to this theory. An arbitrary solution is given by a vector tangent to a sphere whose radius is determined by the topological mass in transform space. Meanwhile a gauge transformation corresponds to a vector normal to this sphere. We discuss the quantization of topological mass on an example.
[ { "version": "v1", "created": "Sun, 25 Nov 2007 10:38:12 GMT" } ]
2008-11-26T00:00:00
[ [ "Saygili", "K.", "" ] ]
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711.3894
Nguyen Chau Van
Nguyen Van Chau
Plane Jacobian conjecture for simple polynomials
6 pages, submitted
Ann. Pol. Math. 93 (2008), No. 3, 247-251
null
null
math.AG math.AC
null
A non-zero constant Jacobian polynomial map $F=(P,Q):\mathbb{C}^2 \longrightarrow \mathbb{C}^2$ has a polynomial inverse if the component $P$ is a simple polynomial, i.e. if, when $P$ extended to a morphism $p:X\longrightarrow \mathbb{P}^1$ of a compactification $X$ of $\mathbb{C}^2$, the restriction of $p$ to each irreducible component $C$ of the compactification divisor $D = X-\mathbb{C}^2$ is either degree 0 or 1.
[ { "version": "v1", "created": "Sun, 25 Nov 2007 11:44:37 GMT" } ]
2017-09-13T00:00:00
[ [ "Van Chau", "Nguyen", "" ] ]
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711.3895
Mannque Rho
Mannque Rho
Hidden Local Symmetry and Dense Half-Skyrmion Matter
6 pages, 1 figure, 1 reference corrected
null
null
null
nucl-th hep-ph hep-th
null
Transition from baryonic matter to color-flavor-locked quark matter is described in terms of skyrmion matter changing into half-skyrmion matter. The intermediate phase between the density $n_p$ at which a skyrmion turns into two half skyrmions and the chiral transition density $n_c^{\chi SR}$ at which hadronic matter changes over to quark matter corresponds to a chiral symmetry restored phase characterized by a vanishing quark condensate and a {\em non-vanishing} pion decay constant. When hidden local fields are incorporated, the vector manifestation of Harada-Yamawaki HLS theory implies that as density approaches $n_c^{\chi SR}$, the gauge coupling $g$ goes to zero (in the chiral limit) and the symmetry "swells" to $SU(N_f)^4$ as proposed by Georgi for the "vector limit." This enhanced symmetry, not present in QCD, can be interpreted as "emergent" in medium due to collective excitations. The fractionization of skyrmions into half-skyrmions resembles closely the magnetic N\'eel--to-valence bond solid (VBS) paramagnet transition where "baby" half-skyrmions enter as relevant degrees of freedom in the intermediate phase. It is suggested that the half-skyrmion phase in dense matter corresponds to the "hadronic freedom" regime that plays a singularly important role in inducing kaon condensation that leads to the collapse of massive compact stars into black holes..
[ { "version": "v1", "created": "Sun, 25 Nov 2007 12:52:16 GMT" }, { "version": "v2", "created": "Wed, 28 Nov 2007 07:22:35 GMT" } ]
2007-11-28T00:00:00
[ [ "Rho", "Mannque", "" ] ]
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711.3896
Tao Zhou
Jue Zhang, Yang Zhao, Baomei Tian, Liqian Peng, Hai-Tao Zhang, Bing-Hong Wang, and Tao Zhou
Accelerating consensus of self-driven swarm via adaptive speed
11 pages, 6 figures
Physica A 388: 1237-1242 (2009)
10.1016/j.physa.2008.11.043
null
cond-mat.dis-nn cond-mat.stat-mech
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In resent years, Vicsek model has attracted more and more attention and been well developed. However, the in-depth analysis on the convergence time are scarce thus far. In this paper, we study some certain factors that mainly govern the convergence time of Vicsek model. By extensively numerical simulations, we find the convergence time scales in a power law with $r^2\ln N$ in the noise-free case, where $r$ and $N$ are horizon radius and the number of particles. Furthermore, to accelerate the convergence, we propose a new model in which the speed of each particle is variable. The convergence time can be remarkably shortened compared with the standard Vicsek model.
[ { "version": "v1", "created": "Sun, 25 Nov 2007 12:52:22 GMT" }, { "version": "v2", "created": "Sun, 28 Sep 2008 12:32:52 GMT" } ]
2009-01-27T00:00:00
[ [ "Zhang", "Jue", "" ], [ "Zhao", "Yang", "" ], [ "Tian", "Baomei", "" ], [ "Peng", "Liqian", "" ], [ "Zhang", "Hai-Tao", "" ], [ "Wang", "Bing-Hong", "" ], [ "Zhou", "Tao", "" ] ]
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711.3897
Jun Tao
Jun Tao, Junhui Fan, Bochen Qian, and Yi Liu
Optical Monitoring of 3C 390.3 from 1995 to 2004 and Possible Periodicities in the Historical Light Curve
Accepted by AJ, 34 pages, 11 figures
null
10.1088/0004-6256/135/2/737
null
astro-ph
null
We report V, R, and I band CCD photometry of the radio galaxy 3C 390.3 obtained with the 1.56-m telescope of the Shanghai Astronomical Observatory from March 1995 to August 2004. Combining these data with data from the literature, we have constructed a historical light curve from 1894 to 2004 and searched for periodicities using the CLEANest program. We find possible periods of 8.30+-1.17, 5.37+-0.49, 3.51+-0.21, and 2.13+-0.08 years.
[ { "version": "v1", "created": "Sun, 25 Nov 2007 12:52:58 GMT" } ]
2009-11-13T00:00:00
[ [ "Tao", "Jun", "" ], [ "Fan", "Junhui", "" ], [ "Qian", "Bochen", "" ], [ "Liu", "Yi", "" ] ]
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711.3898
Paul-Emile Paradan
Paul-Emile Paradan (I3M), Mich\`ele Vergne (CMLS-EcolePolytechnique, IMJ)
Equivariant relative Thom forms and Chern characters
60 pages, some misprints corrected
null
null
null
math.DG
null
These notes are the first chapter of a monograph, dedicated to a detailed proof of the equivariant index theorem for transversally elliptic operators. In this preliminary chapter, we prove a certain number of natural relations in equivariant cohomology. These relations include the Thom isomorphism in equivariant cohomology, the multiplicativity of the relative Chern characters, and the Riemann-Roch relation between the relative Chern character of the Bott symbol and of the relative Thom class.
[ { "version": "v1", "created": "Sun, 25 Nov 2007 13:23:19 GMT" }, { "version": "v2", "created": "Mon, 10 Dec 2007 09:08:52 GMT" } ]
2007-12-10T00:00:00
[ [ "Paradan", "Paul-Emile", "", "I3M" ], [ "Vergne", "Michèle", "", "CMLS-EcolePolytechnique,\n IMJ" ] ]
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711.3899
R. P. Thomas
R. Pandharipande and R. P. Thomas
Stable pairs and BPS invariants
Fixed typo pointed out by Filippo Viviani
Jour. AMS. 23, 267-297, 2010
10.1090/S0894-0347-09-00646-8
null
math.AG hep-th
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We define the BPS invariants of Gopakumar-Vafa in the case of irreducible curve classes on Calabi-Yau 3-folds. The main tools are the theory of stable pairs in the derived category and Behrend's constructible function approach to the virtual class. We prove that for irreducible classes the stable pairs generating function satisfies the strong BPS rationality conjectures. We define the contribution of each curve to the BPS invariants. A curve $C$ only contributes to the BPS invariants in genera lying between the geometric genus and arithmetic genus of $C$. Complete formulae are derived for nonsingular and nodal curves. A discussion of primitive classes on K3 surfaces from the point of view of stable pairs is given in the Appendix via calculations of Kawai-Yoshioka. A proof of the Yau-Zaslow formula for rational curve counts is obtained. A connection is made to the Katz-Klemm-Vafa formula for BPS counts in all genera.
[ { "version": "v1", "created": "Sun, 25 Nov 2007 13:34:13 GMT" }, { "version": "v2", "created": "Fri, 23 May 2008 20:06:22 GMT" }, { "version": "v3", "created": "Sun, 12 Oct 2008 00:02:08 GMT" }, { "version": "v4", "created": "Tue, 23 May 2017 15:05:35 GMT" } ]
2017-05-24T00:00:00
[ [ "Pandharipande", "R.", "" ], [ "Thomas", "R. P.", "" ] ]
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711.39
Walter Wreszinski F.
Walter F. Wreszinski
On Translational Superfluidity and the Landau Criterion for Trapped Bose gases in the Gross-Pitaevski Limit
5 pages, no figures
null
10.1088/1751-8113/41/39/392006
null
cond-mat.supr-con cond-mat.stat-mech
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The two-fluid and Landau criteria for superfluidity are compared for trapped Bose gases. While the two-fluid criterion predicts translational superfluidity, it is suggested, on the basis of the homogeneous Gross-Pitaevski limit, that a necessary part of Landau's criterion, adequate for non-translationally invariant systems, d oes not hold for trapped Bose gases in the GP limit. As a consequence, if the compressibility is detected to be very large (infinite by experimental standards) the two-fluid criterion is seen to be the relevant one in case the system is a tranlational superfluid, while the Landau criterion is the relevant one if translational superfluidity is absent.
[ { "version": "v1", "created": "Sun, 25 Nov 2007 13:47:37 GMT" }, { "version": "v2", "created": "Fri, 22 Aug 2008 09:59:09 GMT" } ]
2009-11-13T00:00:00
[ [ "Wreszinski", "Walter F.", "" ] ]
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711.3901
Marc Bonnet
Y. Rollet, M. Bonnet (LMS), N. Carr\`ere, F.-H. Leroy, J.-F. Maire
Improving the reliability of material databases using multiscale approaches
null
Composites Science and Technology (2008) \`a para\^itre
10.1016/j.compscitech.2007.10.049
null
physics.class-ph
null
This article addresses the propagation of constitutive uncertainties between scales occurring in the multiscale modelling of fibre-reinforced composites. The amplification of such uncertainties through upward or downward transitions by a homogenisation model is emphasized and exemplified with the Mori-Tanaka model. In particular, the sensitivity to data uncertainty in the inverse determination of constituent parameters based on downward transitions is stressed on an example. Then a database improvement method, which exploits simultaneously the available information on constitutive uncertainties at all scales instead of just propagating those associated with one scale, is presented and shown to yield substantial reductions in uncertainty for both the constitutive parameters and the response of structures. The latter finding is demonstrated on two examples of structures, with significant gains in confidence obtained on both.
[ { "version": "v1", "created": "Sun, 25 Nov 2007 13:50:54 GMT" } ]
2008-04-21T00:00:00
[ [ "Rollet", "Y.", "", "LMS" ], [ "Bonnet", "M.", "", "LMS" ], [ "Carrère", "N.", "" ], [ "Leroy", "F. -H.", "" ], [ "Maire", "J. -F.", "" ] ]
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711.3902
Wolfgang Ochs
Wolfgang Ochs
The glueball among the light scalar mesons
Contribution to HADRON07 (XII Int. Conf. on Hadron Spectroscopy - Frascati, Oct 8-13, 2007), reference added
null
null
MPP-2007-173
hep-ph hep-ex
null
The lightest gluonic meson is expected with J^{PC}=0^{++}, calculations in full QCD point towards a mass of around 1 GeV. The interpretation of the scalar meson spectrum is hindered as some states are rather broad. In a largely model-independent analysis of pi+ pi- \to pi+ pi-, pi0 pi0 scattering in the region 600-1800 MeV a unique solution for the isoscalar S-wave is obtained. The resonances f_0(980), f_0(1500) and the broad f_0(600) or ``sigma'' are clearly identified whereas f_0(1370) is not seen at the level B(f_0(1370)\to pi pi)\gtrsim 10%. Arguments for the broad state to be a glueball are recalled. We see no contradiction with the reported large B(sigma \to gamma gamma) and propose some further experimental tests.
[ { "version": "v1", "created": "Mon, 26 Nov 2007 14:22:20 GMT" }, { "version": "v2", "created": "Fri, 30 Nov 2007 14:37:18 GMT" } ]
2011-11-10T00:00:00
[ [ "Ochs", "Wolfgang", "" ] ]
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711.3903
Alexander Bershadskii
A. Bershadskii
Decoupling and coherent plasma oscillations around last scattering
null
Phys. Lett. A, 372, 2741-2745 (2008)
10.1016/j.physleta.2007.12.041
null
astro-ph nlin.CD physics.plasm-ph
null
Coherent properties of the baryon-photon fluid decoupling are considered in the terms of an effective nonlinear Schr\"{o}dinger equation for a macroscopic wave function that specifies the index of the coherent state. Generation of a transitional acoustic turbulence preceding formation of large-scale condensate in the plasma and its influence on the CMB power spectrum has been studied. A scaling $k^{-1}$ law is derived for the CMB Doppler spectrum $E(k)$ (angle-averaged) in the {\it wavenumber} space, for sufficiently large wavenumber $k$ and for the weak nonlinear and completely disordered initial conditions. Using the recent WMAP data it is shown that the so-called first acoustic peak represents (in a compensated spectral form) a pre-condensate fraction of the spectrum $E(k)$ at a rather advance stage of the condensate formation process.
[ { "version": "v1", "created": "Sun, 25 Nov 2007 14:46:51 GMT" } ]
2008-04-07T00:00:00
[ [ "Bershadskii", "A.", "" ] ]
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711.3904
Hong-Jian Feng
Hong-Jian Feng and Fa-Min Liu
Ab initio prediction on ferrotoroidic olivine Li4MnFeCoNiP4O16
20 pages, 8 figures, submitted to Physics Letters A
null
null
null
cond-mat.mtrl-sci cond-mat.str-el
null
First-principles calculation predict that olivine Li4MnFeCoNiP4O16 has ferrotoroidic characteristic and ferrimagnetic configuration with magnetic moment of 1.56 \muB per formula unit. The ferrotoroidicity of this material makes it a potential candidate for magnetoelectric materials . Based on the orbital-resolved density of states for the transtion-metal ions in Li4MnFeCoNiP4O16, the spin configuration for Mn2+,Fe3+,Co2+, and Ni2+ is t2g3eg2, t2g3eg2,t2g1t2g3eg1eg2, and t2g2t2g3eg1eg2, respectively. Density functional theory plus U (DFT+U) shows a indirect band gap of 1.25 eV in this predicted material, which is not simply related to the electronic conductivity in terms of being used as cathode material in rechargeable Li-ion batteries.
[ { "version": "v1", "created": "Mon, 26 Nov 2007 02:01:53 GMT" } ]
2007-11-27T00:00:00
[ [ "Feng", "Hong-Jian", "" ], [ "Liu", "Fa-Min", "" ] ]
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711.3905
John Ryan
Alexander Balinsky and John Ryan
Some Sharp L^2 Inequalities for Dirac Type Operators
This is a contribution to the Proceedings of the 2007 Midwest Geometry Conference in honor of Thomas P. Branson, published in SIGMA (Symmetry, Integrability and Geometry: Methods and Applications) at http://www.emis.de/journals/SIGMA/
SIGMA 3 (2007), 114, 10 pages
10.3842/SIGMA.2007.114
null
math-ph math.DG math.MP
null
We use the spectra of Dirac type operators on the sphere $S^{n}$ to produce sharp $L^{2}$ inequalities on the sphere. These operators include the Dirac operator on $S^{n}$, the conformal Laplacian and Paenitz operator. We use the Cayley transform, or stereographic projection, to obtain similar inequalities for powers of the Dirac operator and their inverses in $\mathbb{R}^{n}$.
[ { "version": "v1", "created": "Sun, 25 Nov 2007 15:05:14 GMT" } ]
2008-04-25T00:00:00
[ [ "Balinsky", "Alexander", "" ], [ "Ryan", "John", "" ] ]
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711.3906
Tarek Khalil
Tarek Khalil and Jean Richert
Low energy properties of non-perturbative quantum systems: a space reduction approach
13 pages, 3 figures, to appear in PLA
Physics Letters A 372 (2008) 2217--2222
10.1016/j.physleta.2007.11.044
null
quant-ph cond-mat.str-el nucl-th physics.atm-clus
null
We propose and test a renormalization procedure which acts in Hilbert space. We test its efficiency on strongly correlated quantum spin systems by working out and analyzing the low-energy spectral properties of frustrated quantum spin systems in different parts of the phase diagram and in the neighbourhood of quantum critical points.
[ { "version": "v1", "created": "Sun, 25 Nov 2007 15:18:11 GMT" } ]
2009-11-13T00:00:00
[ [ "Khalil", "Tarek", "" ], [ "Richert", "Jean", "" ] ]
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711.3907
Atsushi Takahashi
Atsushi Takahashi
Weighted Projective Lines Associated to Regular Systems of Weights of Dual Type
16 pages, improved Section 7
null
null
null
math.AG
null
We associate to a regular system of weights a weighted projective line over an algebraically closed field of characteristic zero in two different ways. One is defined as a quotient stack via a hypersurface singularity for a regular system of weights and the other is defined via the signature of the same regular system of weights. The main result in this paper is that if a regular system of weights is of dual type then these two weighted projective lines have equivalent abelian categories of coherent sheaves. As a corollary, we can show that the triangulated categories of the graded singularity associated to a regular system of weights has a full exceptional collection, which is expected from homological mirror symmetries. Main theorem of this paper will be generalized to more general one, to the case when a regular system of weights is of genus zero, which will be given in the joint paper with Kajiura and Saito. Since we need more detailed study of regular systems of weights and some knowledge of algebraic geometry of Deligne--Mumford stacks there, the author write a part of the result in this paper to which another simple proof based on the idea by Geigle--Lenzing can be applied.
[ { "version": "v1", "created": "Sun, 25 Nov 2007 15:40:50 GMT" }, { "version": "v2", "created": "Fri, 7 Mar 2008 08:52:16 GMT" } ]
2008-03-07T00:00:00
[ [ "Takahashi", "Atsushi", "" ] ]
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