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13882515
astro-ph/0104383
2001-04-24
On the masses of black-holes in radio-loud quasars
The central black-hole masses of a sample of radio-loud quasars are estimated by using the data of $H_{\beta}$ line-width and the optical continuum luminosity. The vast majority of the quasars in this sample have black-hole masses larger than $10^{8} M_{\odot}$, while a few quasars may contain relatively smaller black-...
[ "astro-ph" ]
null
[ "target.author.publication_history.key_reference" ]
null
null
null
16653537
hep-th/0104202
2001-04-24
Duality of the Fermionic 2d Black Hole and N=2 Liouville Theory as Mirror Symmetry
We prove the equivalence of the SL(2,R)/U(1) Kazama-Suzuki model, which is a fermionic generalization of the 2d Black Hole, and N=2 Liouville theory. We show that this duality is an example of mirror symmetry. The essential part of the derivation is to realize the fermionic 2d Black Hole as the low energy limit of a ga...
[ "hep-th" ]
null
[ "target.author.publication_history.key_reference" ]
null
null
null
1486494
nlin/0104059
2001-04-25
Transition from oscillatory to excitable regime in a system forced at three times its natural frequency
The effect of a temporal modulation at three times the critical frequency on a Hopf bifurcation is studied in the framework of amplitude equations. We consider a complex Ginzburg-Landau equation with an extra quadratic term, resulting from the strong coupling between the external field and the unstable modes. We show t...
[ "nlin.PS" ]
null
[ "target.author.publication_history" ]
[ { "corpus_id": "3043734", "num_citations": null } ]
[ { "author_id": "r gallego_1", "name": "Rafael Gallego", "publication_history": null, "h_index": null, "num_papers": null, "num_citations": null }, { "author_id": "d walgraef_1", "name": "Daniel Walgraef", "publication_history": null, "h_index": null, "num_papers": nul...
null
29274691
hep-th/0104216
2001-04-25
Algebraic solution for the vector potential in the Dirac equation
The Dirac equation for an electron in an external electromagnetic field can be regarded as a singular set of linear equations for the vector potential. Radford's method of algebraically solving for the vector potential is reviewed, with attention to the additional constraints arising from non-maximality of the rank. Th...
[ "hep-th", "math-ph", "math.MP" ]
null
[ "target.author.publication_history.key_reference" ]
null
null
null
119157629
math/0104241
2001-04-25
The Laurent phenomenon
A composition of birational maps given by Laurent polynomials need not be given by Laurent polynomials; however, sometimes---quite unexpectedly---it does. We suggest a unified treatment of this phenomenon, which covers a large class of applications. In particular, we settle in the affirmative a conjecture of D$.$Gale a...
[ "math.CO" ]
null
[ "target.author.publication_history.key_reference" ]
null
null
null
1980518
astro-ph/0104427
2001-04-26
Near-infrared template spectra of normal galaxies: k-corrections, galaxy models and stellar populations
We have observed 28 local galaxies in the wavelength range between 1 and 2.4 mic in order to define template spectra of the normal galaxies along the Hubble sequence. Five galaxies per morphological type were observed in most cases, and the resulting RMS spread of the normalized spectra of each class, including both in...
[ "astro-ph" ]
null
[ "target.author.publication_history.key_reference" ]
null
null
null
42189075
cond-mat/0104519
2001-04-26
Bond operator theory of doped antiferromagnets: from Mott insulators with bond-centered charge order, to superconductors with nodal fermions
The ground states and excitations of two-dimensional insulating and doped Mott insulators are described by a bond operator formalism. While the method represents the degrees of freedom of an arbitrary antiferromagnet exactly, it is especially suited to systems in which there is a natural pairing of sites into bonds, as...
[ "cond-mat.str-el", "cond-mat.supr-con" ]
null
[ "target.author.publication_history.key_reference" ]
null
null
null
10132718
quant-ph/0104129
2001-04-26
A Quantum Adiabatic Evolution Algorithm Applied to Random Instances of an NP-Complete Problem
A quantum system will stay near its instantaneous ground state if the Hamiltonian that governs its evolution varies slowly enough. This quantum adiabatic behavior is the basis of a new class of algorithms for quantum computing. We test one such algorithm by applying it to randomly generated, hard, instances of an NP-co...
[ "quant-ph" ]
null
[ "target.author.publication_history.key_reference" ]
null
null
null
118686517
hep-ex/0104049
2001-04-27
Evidence for Neutrino Oscillations from the Observation of Electron Anti-neutrinos in a Muon Anti-Neutrino Beam
A search for muon anti-neutrino to electron anti-neutrino oscillations was conducted by the Liquid Scintillator Neutrino Detector at the Los Alamos Neutron Science Center using muon anti-neutrinos from positive muon decay at rest. A total excess of 87.9 +/- 22.4 +/- 6.0 events consistent with electron anti-neutrino plu...
[ "hep-ex" ]
null
[ "target.author.publication_history.key_reference" ]
null
null
null
18346055
cond-mat/0104523
2001-04-27
Vortex lattice formation in a rotating Bose-Einstein condensate
We study the dynamics of vortex lattice formation of a rotating trapped Bose-Einstein condensate by numerically solving the two-dimensional Gross-Pitaevskii equation, and find that the condensate undergoes elliptic deformation, followed by unstable surface-mode excitations before forming a quantized vortex lattice. The...
[ "cond-mat" ]
null
[ "target.author.publication_history.key_reference" ]
null
null
null
2742237
cond-mat/0104546
2001-04-27
Are randomly grown graphs really random?
We analyze a minimal model of a growing network. At each time step, a new vertex is added; then, with probability delta, two vertices are chosen uniformly at random and joined by an undirected edge. This process is repeated for t time steps. In the limit of large t, the resulting graph displays surprisingly rich charac...
[ "cond-mat.stat-mech", "cond-mat.dis-nn" ]
null
[ "target.author.publication_history", "target.author.publication_history.key_reference" ]
[]
[ { "author_id": "d callaway_1", "name": "Duncan [\"S.\"] Callaway", "publication_history": null, "h_index": null, "num_papers": null, "num_citations": null }, { "author_id": "j hopcroft_1", "name": "John [\"E.\"] Hopcroft", "publication_history": null, "h_index": null, ...
null
9938621
cs/0104019
2001-04-27
Dynamic Nonlocal Language Modeling via Hierarchical Topic-Based Adaptation
This paper presents a novel method of generating and applying hierarchical, dynamic topic-based language models. It proposes and evaluates new cluster generation, hierarchical smoothing and adaptive topic-probability estimation techniques. These combined models help capture long-distance lexical dependencies. Experimen...
[ "cs.CL" ]
null
[ "target.author.publication_history" ]
[]
[ { "author_id": "r florian_1", "name": "Radu Florian", "publication_history": null, "h_index": null, "num_papers": null, "num_citations": null }, { "author_id": "d yarowsky_1", "name": "David Yarowsky", "publication_history": null, "h_index": null, "num_papers": null, ...
null
13004716
quant-ph/0104137
2001-04-29
Quantum Walks on the Hypercube
Recently, it has been shown that one-dimensional quantum walks can mix more quickly than classical random walks, suggesting that quantum Monte Carlo algorithms can outperform their classical counterparts. We study two quantum walks on the n-dimensional hypercube, one in discrete time and one in continuous time. In both...
[ "quant-ph" ]
null
[ "target.author.publication_history.key_reference" ]
null
null
null
1490166
cond-mat/0105015
2001-05-01
Learning curves for Gaussian process regression: Approximations and bounds
We consider the problem of calculating learning curves (i.e., average generalization performance) of Gaussian processes used for regression. On the basis of a simple expression for the generalization error, in terms of the eigenvalue decomposition of the covariance function, we derive a number of approximation schemes....
[ "cond-mat.dis-nn", "cond-mat.stat-mech" ]
null
[ "target.author.publication_history.key_reference" ]
null
null
null
5941720
cs/0204046
2001-05-01
Optimal Aggregation Algorithms for Middleware
Let D be a database of N objects where each object has m fields. The objects are given in m sorted lists (where the ith list is sorted according to the ith field). Our goal is to find the top k objects according to a monotone aggregation function t, while minimizing access to the lists. The problem arises in several co...
[ "cs.DB", "cs.DS" ]
null
[ "target.author.publication_history.key_reference" ]
null
null
null
969048
cond-mat/0105019
2001-05-02
Dynamics of collapsing and exploding Bose-Einstein condensates
We explored the dynamics of how a Bose-Einstein condensate collapses and subsequently explodes when the balance of forces governing the size and shape of the condensate is suddenly altered. A condensate's equilibrium size and shape is strongly affected by the inter-atomic interactions. Our ability to induce a collapse ...
[ "cond-mat.stat-mech" ]
null
[ "target.author.publication_history.key_reference" ]
null
null
null
3264132
cs/0105003
2001-05-02
Rule Writing or Annotation: Cost-efficient Resource Usage for Base Noun Phrase Chunking
This paper presents a comprehensive empirical comparison between two approaches for developing a base noun phrase chunker: human rule writing and active learning using interactive real-time human annotation. Several novel variations on active learning are investigated, and underlying cost models for cross-modal machine...
[ "cs.CL", "cs.AI" ]
null
[ "target.author.publication_history" ]
[ { "corpus_id": "1845735", "num_citations": null } ]
[ { "author_id": "g ngai_1", "name": "Grace Ngai", "publication_history": null, "h_index": null, "num_papers": null, "num_citations": null }, { "author_id": "d yarowsky_1", "name": "David Yarowsky", "publication_history": null, "h_index": null, "num_papers": null, "...
null
14694795
math/0105013
2001-05-02
The calibration method for the Mumford-Shah functional and free-discontinuity problems
In this paper we present a minimality criterion for the Mumford-Shah functional, and more generally for non convex variational integrals on SBV which couple a surface and a bulk term. This method provides short and easy proofs for several minimality results.
[ "math.AP" ]
null
[ "target.author.publication_history.key_reference" ]
null
null
null
6347300
math/0105014
2001-05-02
Quantum K-Theory I: Foundations
This work is devoted to the study of the foundations of quantum K-theory, a K-theoretic version of quantum cohomology theory. In particular, it gives a deformation of the ordinary K-ring K(X) of a smooth projective variety X, analogous to the relation between quantum cohomology and ordinary cohomology. This new quantum...
[ "math.AG", "math.KT" ]
null
[ "target.author.publication_history.key_reference" ]
null
null
null
53377247
astro-ph/0105023
2001-05-02
Statistical Properties of Galactic Starlight Polarization
We present a statistical analysis of Galactic interstellar polarization from the largest compilation available of starlight data. The data comprises ~ 9300 stars of which we have selected ~ 5500 for our analysis. We find a nearly linear growth of mean polarization degree with extinction. The amplitude of this correlati...
[ "astro-ph" ]
null
[ "target.author.publication_history.key_reference" ]
null
null
null
6637145
cond-mat/0105070
2001-05-03
Unsupervised learning and adaptation in a model of adult neurogenesis
Adult neurogenesis has long been documented in the vertebrate brain, and recently even in humans. Although it has been conjectured for many years that its functional role is related to the renewing of memories, no clear mechanism as to how this can be achieved has been proposed. We present a scheme in which incorporati...
[ "cond-mat.dis-nn", "q-bio" ]
null
[ "target.author.publication_history" ]
[]
[ { "author_id": "g cecchi_1", "name": "Guillermo [\"A.\"] Cecchi", "publication_history": null, "h_index": null, "num_papers": null, "num_citations": null }, { "author_id": "l petreanu_0", "name": "Leopoldo [\"T.\"] Petreanu", "publication_history": null, "h_index": null, ...
null
18125436
astro-ph/0105051
2001-05-03
Stellar evolution with rotation VII: Low metallicity models and the blue to red supergiant ratio in the SMC
We calculate a grid of models with and without the effects of axial rotation for massive stars in the range of 9 to 60 M$_{\odot}$ and metallicity $Z$ = 0.004 appropriate for the SMC. Remarkably, the ratios $\Omega/\Omega_{\mathrm{crit}}$ of the angular velocity to the break-up angular velocity grow strongly during the...
[ "astro-ph" ]
null
[ "target.author.publication_history.key_reference" ]
null
null
null
14720050
cond-mat/0105098
2001-05-04
Negative Resistance in Brownian Transport
We prove that negative incremental resistance cannot occur on 1D spaces like the circle or the line; we construct an explicit two-dimensional model on the cylinder, and its collapse into a branched 1D backbone. We derive an accurate numerical method for solving our 2D model, and discuss the relevance of the model to bi...
[ "cond-mat.stat-mech", "cond-mat.soft" ]
null
[ "target.author.publication_history" ]
[]
[ { "author_id": "g cecchi_1", "name": "Guillermo [\"A.\"] Cecchi", "publication_history": null, "h_index": null, "num_papers": null, "num_citations": null }, { "author_id": "m magnasco_1", "name": "Marcelo [\"O.\"] Magnasco", "publication_history": null, "h_index": null, ...
null
67774115
astro-ph/0105077
2001-05-04
A precise determination of angular momentum in the black hole candidate GRO J1655-40
We note that the recently discovered 450 Hz frequency in the X-ray flux of the black hole candidate GRO J1655-40 is in a 3:2 ratio to the previously known 300 Hz frequency of quasi-periodic oscillations (QPO) in the same source. If the origin of high frequency QPOs in black hole systems is a resonance between orbital a...
[ "astro-ph" ]
null
[ "target.author.publication_history.key_reference" ]
null
null
null
118947116
astro-ph/0105088
2001-05-04
The Absorbers Toward CSO 118: Superclustering at {z~3}, or an Intrinsic Absorption Complex?
We present two low resolution (R~1300) high signal-to-noise spectra (Wr,lim~50mA) of the quasar CSO 118 (zem=2.97) taken with the Hobby-Eberly Telescope Marcario Low Resolution Spectrograph. We detect eight absorbers selected by the CIV 1548,1550 absorption doublet in the redshift range {2.23 < zabs < 2.97}, seven of w...
[ "astro-ph" ]
null
[ "target.author.publication_history.key_reference" ]
null
null
null
14361903
cond-mat/0105097
2001-05-04
On a common circle: natural scenes and Gestalt rules
To understand how the human visual system analyzes images, it is essential to know the structure of the visual environment. In particular, natural images display consistent statistical properties that distinguish them from random luminance distributions. We have studied the geometric regularities of oriented elements (...
[ "cond-mat.dis-nn", "q-bio" ]
null
[ "target.author.publication_history", "target.author.publication_history.key_reference" ]
[]
[ { "author_id": "m sigman_1", "name": "Mariano Sigman", "publication_history": null, "h_index": null, "num_papers": null, "num_citations": null }, { "author_id": "g cecchi_1", "name": "Guillermo [\"A.\"] Cecchi", "publication_history": null, "h_index": null, "num_paper...
null
9848358
hep-th/0105045
2001-05-04
Disk Instantons, Mirror Symmetry and the Duality Web
We apply the methods recently developed for computation of type IIA disk instantons using mirror symmetry to a large class of D-branes wrapped over Lagrangian cycles of non-compact Calabi-Yau 3-folds. Along the way we clarify the notion of ``flat coordinates'' for the boundary theory. We also discover an integer IR amb...
[ "hep-th" ]
null
[ "target.author.publication_history.key_reference" ]
null
null
null
1037335
quant-ph/0105019
2001-05-06
Partial recovery of entanglement in bipartite entanglement transformations
Any deterministic bipartite entanglement transformation involving finite copies of pure states and carried out using local operations and classical communication (LOCC) results in a net loss of entanglement. We show that for almost all such transformations, partial recovery of lost entanglement is achievable by using $...
[ "quant-ph" ]
null
[ "target.author.publication_history" ]
[]
[ { "author_id": "s bandyopadhyay_6", "name": "Somshubhro Bandyopadhyay", "publication_history": null, "h_index": null, "num_papers": null, "num_citations": null }, { "author_id": "v roychowdhury_1", "name": "Vwani [\"P.\"] Roychowdhury", "publication_history": null, "h_ind...
null
8978722
cs/0105013
2001-05-07
Dijkstra's Self-Stabilizing Algorithm in Unsupportive Environments
The first self-stabilizing algorithm [Dij73] assumed the existence of a central daemon, that activates one processor at time to change state as a function of its own state and the state of a neighbor. Subsequent research has reconsidered this algorithm without the assumption of a central daemon, and under different for...
[ "cs.DC" ]
null
[ "target.author.publication_history" ]
[]
[ { "author_id": "s dolev_1", "name": "Shlomi Dolev", "publication_history": null, "h_index": null, "num_papers": null, "num_citations": null }, { "author_id": "t herman_2", "name": "Ted Herman", "publication_history": null, "h_index": null, "num_papers": null, "num...
null
264201642
astro-ph/0105113
2001-05-07
An excursion set model of hierarchical clustering: Ellipsoidal collapse and the moving barrier
The excursion set approach allows one to estimate the abundance and spatial distribution of virialized dark matter haloes efficiently and accurately. The predictions of this approach depend on how the nonlinear processes of collapse and virialization are modelled. We present simple analytic approximations which allow u...
[ "astro-ph" ]
null
[ "target.author.publication_history.key_reference" ]
null
null
null
6237722
cs/0105016
2001-05-08
Probabilistic top-down parsing and language modeling
This paper describes the functioning of a broad-coverage probabilistic top-down parser, and its application to the problem of language modeling for speech recognition. The paper first introduces key notions in language modeling and probabilistic parsing, and briefly reviews some previous approaches to using syntactic s...
[ "cs.CL" ]
null
[ "target.author.publication_history.key_reference" ]
null
null
null
5357079
cond-mat/0105162
2001-05-08
Heterogeneous volatility cascade in financial markets
Using high frequency data, we have studied empirically the change of volatility, also called volatility derivative, for various time horizons. In particular, the correlation between the volatility derivative and the volatility realized in the next time period is a measure of the response function of the market particip...
[ "cond-mat.stat-mech", "q-fin.ST" ]
null
[ "target.author.publication_history.key_reference" ]
null
null
null
6232586
cond-mat/0105161
2001-05-08
Dynamical and correlation properties of the Internet
The description of the Internet topology is an important open problem, recently tackled with the introduction of scale-free networks. In this paper we focus on the topological and dynamical properties of real Internet maps in a three years time interval. We study higher order correlation functions as well as the dynami...
[ "cond-mat.stat-mech", "cond-mat.dis-nn" ]
null
[ "target.author.publication_history.key_reference" ]
null
null
null
15614832
quant-ph/0105032
2001-05-08
Quantum Digital Signatures
We present a quantum digital signature scheme whose security is based on fundamental principles of quantum physics. It allows a sender (Alice) to sign a message in such a way that the signature can be validated by a number of different people, and all will agree either that the message came from Alice or that it has be...
[ "quant-ph" ]
null
[ "target.author.publication_history.key_reference" ]
null
null
null
14493286
astro-ph/0105148
2001-05-09
The BOOMERANG North America Instrument: a balloon-borne bolometric radiometer optimized for measurements of cosmic background radiation anisotropies from 0.3 to 4 degrees
We describe the BOOMERANG North America (BNA) instrument, a balloon-borne bolometric radiometer designed to map the Cosmic Microwave Background (CMB) radiation with 0.3 deg resolution over a significant portion of the sky. This receiver employs new technologies in bolometers, readout electronics, millimeter-wave optics...
[ "astro-ph" ]
null
[ "target.author.publication_history.key_reference" ]
null
null
null
10772757
cond-mat/0105191
2001-05-09
Expected Shortfall: a natural coherent alternative to Value at Risk
We discuss the coherence properties of Expected Shortfall (ES) as a financial risk measure. This statistic arises in a natural way from the estimation of the "average of the 100p % worst losses" in a sample of returns to a portfolio. Here p is some fixed confidence level. We also compare several alternative representat...
[ "cond-mat.stat-mech", "q-fin.RM" ]
null
[ "target.author.publication_history.key_reference" ]
null
null
null
13029538
astro-ph/0105158
2001-05-09
The Universal Mass Accretion History of CDM Haloes
We use the extended Press-Schechter formalism to investigate the rate at which cold dark matter haloes accrete mass. We discuss the shortcomings of previous methods that have been used to compute the mass accretion histories of dark matter haloes, and present an improved method based on the N-branch merger tree algorit...
[ "astro-ph" ]
null
[ "target.author.publication_history.key_reference" ]
null
null
null
119442570
nlin/0105028
2001-05-10
Slow energy relaxation and localization in 1D lattices
We investigate the energy relaxation process produced by thermal baths at zero temperature acting on the boundary atoms of chains of classical anharmonic oscillators. Time-dependent perturbation theory allows us to obtain an explicit solution of the harmonic problem: even in such a simple system nontrivial features eme...
[ "nlin.CD" ]
null
[ "target.author.publication_history" ]
[]
[ { "author_id": "f piazza_1", "name": "Francesco Piazza", "publication_history": null, "h_index": null, "num_papers": null, "num_citations": null }, { "author_id": "s lepri_2", "name": "Stefano Lepri", "publication_history": null, "h_index": null, "num_papers": null, ...
null
7676710
astro-ph/0105178
2001-05-10
Shapelets: I. A Method for Image Analysis
We present a new method for the analysis of images, a fundamental task in observational astronomy. It is based on the linear decomposition of each object in the image into a series of localised basis functions of different shapes, which we call `Shapelets'. A particularly useful set of complete and orthonormal shapelet...
[ "astro-ph" ]
null
[ "target.author.publication_history.key_reference" ]
null
null
null
119520441
astro-ph/0105170
2001-05-10
A near-solar metallicity damped Lyman-alpha system toward the BAL quasar Tol 1037-2703
We report the detection of a Broad Absorption Line (BAL) outflow in the spectrum of Tol 1037-2703 with three main BALs at 36000, 25300 and 22300~\kms outflow velocities. Although the overall flow is dominated by high ionization lines like and C IV, the gas of highest velocity shows absorption from Mg I, Mg II and Fe II...
[ "astro-ph" ]
null
[ "target.author.publication_history.key_reference" ]
null
null
null
18126187
astro-ph/0105179
2001-05-10
Shapelets: II. A Method for Weak Lensing Measurements
Weak gravitational lensing provides a unique method to directly measure the distribution of mass in the universe. Because the distortions induced by lensing in the shape of background galaxies are small, the measurement of weak lensing requires high precision. Here, we present a new method for obtaining reliable weak s...
[ "astro-ph" ]
null
[ "target.author.publication_history.key_reference" ]
null
null
null
16120716
hep-th/0105104
2001-05-11
Entropy bounds in cosmology and conformal field theories
We study the ratio of the entropy to the total energy in conformal field theories at finite temperature. For the free field realizations of N=4 super Yang-Mills theory in D=4 and the (2,0) tensor multiplet in D=6, the ratio is bounded from above. The corresponding bounds are less stringent than the recently proposed Ve...
[ "hep-th" ]
null
[ "target.author.publication_history" ]
[]
[ { "author_id": "g siopsis_1", "name": "George Siopsis", "publication_history": null, "h_index": null, "num_papers": null, "num_citations": null } ]
null
37564720
cond-mat/0105238
2001-05-11
Quantum Annealing of a Disordered Magnet
Traditional simulated annealing utilizes thermal fluctuations for convergence in optimization problems. Quantum tunneling provides a different mechanism for moving between states, with the potential for reduced time scales. We compare thermal and quantum annealing in a model disordered Ising magnet, Li\sub{Ho}{0.44}\su...
[ "cond-mat" ]
null
[ "target.author.publication_history.key_reference" ]
null
null
null
15123577
astro-ph/0105203
2001-05-11
Hard X-ray properties of blazars
We have considered all blazars observed in the X-ray band and for which the slope of the X-ray spectrum is available. We have collected 421 spectra of 268 blazars, including 12 archival unpublished ASCA spectra of 7 blazars whose analysisis presented here. The X-ray spectra of blazars show trends as a function of their...
[ "astro-ph" ]
null
[ "target.author.publication_history.key_reference" ]
null
null
null
118907159
astro-ph/0105231
2001-05-14
Composite Quasar Spectra From the Sloan Digital Sky Survey
We have created a variety of composite quasar spectra using a homogeneous data set of over 2200 spectra from the Sloan Digital Sky Survey (SDSS). The quasar sample spans a redshift range of 0.044 <= z <= 4.789, and an absolute r' magnitude range of -18.0 to -26.5. The median composite covers a rest wavelength range fro...
[ "astro-ph" ]
null
[ "target.author.publication_history.key_reference" ]
null
null
null
15698916
hep-ph/0105121
2001-05-14
Isolated prompt photon photoproduction at NLO
We present a full next-to-leading order code to calculate the photoproduction of prompt photons. The code is a general purpose program of partonic event generator type with large flexibility. We study the possibility to constrain the photon structure functions and comment on isolation issues. A comparison to ZEUS data ...
[ "hep-ph" ]
null
[ "target.author.publication_history.key_reference" ]
null
null
null
15389382
hep-th/0105131
2001-05-14
Thermodynamics of conformal field theories and cosmology
We study the ratio of the entropy to the total energy in conformal field theories at finite temperature. For the free field realizations of N=4 super Yang-Mills theory in D=4 and the (2,0) tensor multiplet in D=6, the ratio is bounded from above. The corresponding bounds are less stringent than the recently proposed Ve...
[ "hep-th" ]
null
[ "target.author.publication_history" ]
[]
[ { "author_id": "g siopsis_1", "name": "George Siopsis", "publication_history": null, "h_index": null, "num_papers": null, "num_citations": null } ]
null
1789757
cond-mat/0105270
2001-05-14
An elastoplastic theory of dislocations as a physical field theory with torsion
We consider a static theory of dislocations with moment stress in an anisotropic or isotropic elastoplastical material as a T(3)-gauge theory. We obtain Yang-Mills type field equations which express the force and the moment equilibrium. Additionally, we discuss several constitutive laws between the dislocation density ...
[ "cond-mat", "gr-qc" ]
null
[ "target.author.publication_history.key_reference" ]
null
null
null
11812709
astro-ph/0105227
2001-05-14
Constraints on the long-range properties of gravity from weak gravitational lensing
Weak gravitational lensing provides a means of testing the long-range properties of gravity. Current measurements are consistent with standard Newtonian gravity and inconsistent with substantial modifications on Mpc scales. The data allows long range gravity to deviate from a 1/r potential only on scales where standard...
[ "astro-ph", "gr-qc", "hep-ph" ]
null
[ "target.author.publication_history" ]
[ { "corpus_id": "8917755", "num_citations": null } ]
[ { "author_id": "m white_10", "name": "Martin White", "publication_history": null, "h_index": null, "num_papers": null, "num_citations": null }, { "author_id": "c kochanek_1", "name": "Christopher [\"S.\"] Kochanek", "publication_history": null, "h_index": null, "num_p...
null
118258397
cond-mat/0105253
2001-05-14
Commensurate and Incommensurate O(n) Spin Systems: Novel Even-Odd Effects, A Generalized Mermin-Wagner-Coleman Theorem, and Ground States
We examine n component spin systems with arbitrary two spin interactions (of unspecified range) within a general framework to highlight some new subtleties present in incommensurate systems. We determine the ground states of all translationally invariant O(n>1) systems and prove that barring commensurability effects th...
[ "cond-mat.stat-mech" ]
null
[ "target.author.publication_history" ]
[]
[ { "author_id": "z nussinov_1", "name": "Zohar Nussinov", "publication_history": null, "h_index": null, "num_papers": null, "num_citations": null } ]
null
25517098
hep-ex/0105031
2001-05-15
A measurement of branching ratios of $D^+$ and $D^+_s$ hadronic decays to four-body final states containing a $K_S$
We have studied hadronic four-body decays of $D^+$ and $D^+_s$ mesons with a $K_S$ in the final state using data recorded during the 1996-1997 fixed-target run at Fermilab high energy photoproduction experiment FOCUS. We report a new branching ratio measurement of $\Gamma(D^+\to K_S K^-\pi^+\pi^+)/\Gamma(D^+\to K_S \pi...
[ "hep-ex" ]
null
[ "target.author.publication_history" ]
[]
[ { "author_id": "j link_3", "name": "Jonathan Link", "publication_history": null, "h_index": null, "num_papers": null, "num_citations": null }, { "author_id": "m reyes_6", "name": "Marco [\"A.\",\"H.\"] Reyes", "publication_history": null, "h_index": null, "num_papers"...
null
258942
cond-mat/0105306
2001-05-15
Lethality and centrality in protein networks
In this paper we present the first mathematical analysis of the protein interaction network found in the yeast, S. cerevisiae. We show that, (a) the identified protein network display a characteristic scale-free topology that demonstrate striking similarity to the inherent organization of metabolic networks in particul...
[ "cond-mat.stat-mech", "cond-mat.dis-nn", "q-bio" ]
null
[ "target.author.publication_history.key_reference" ]
null
null
null
119340862
hep-th/0105147
2001-05-15
O(n) Spin Systems- Some General Properties: A Generalized Mermin-Wagner-Coleman Theorem, Ground States, Peierls Bounds, and Dynamics
Here we examine O(n) systems with arbitrary two spin interactions (of unspecified range) within a general framework. We shall focus on translationally invariant interactions. In the this case, we determine the ground states of the $O(n \ge 2)$ systems. We further illustrate how one may establish Peierls bounds for many...
[ "hep-th" ]
null
[ "target.author.publication_history" ]
[]
[ { "author_id": "z nussinov_1", "name": "Zohar Nussinov", "publication_history": null, "h_index": null, "num_papers": null, "num_citations": null } ]
null
15397568
cond-mat/0105343
2001-05-17
Interface roughening in Hele--Shaw flows with quenched disorder: experimental and theoretical results
We study the forced fluid invasion of an air-filled model porous medium at constant flow rate, in 1+1 dimensions, both experimentally and theoretically. We focus on the non-local character of the interface dynamics, due to liquid conservation, and its effect on the scaling properties of the interface upon roughening. S...
[ "cond-mat" ]
null
[ "target.author.publication_history.key_reference" ]
null
null
null
11795927
gr-qc/0105055
2001-05-17
Black holes are one-dimensional
The holographic principle has revealed that physical systems in 3-D space, black holes included, are basically two-dimensional as far as their information content is concerned. This conclusion is complemented by one sketched here: as far as entropy or information flow is concerned, a black hole behaves as a one-dimensi...
[ "gr-qc" ]
null
[ "target.author.publication_history.key_reference" ]
null
null
null
118237531
astro-ph/0105302
2001-05-17
MASTER of the CMB Anisotropy Power Spectrum: A Fast Method for Statistical Analysis of Large and Complex CMB Data Sets
We describe a fast and accurate method for estimation of the cosmic microwave background (CMB) anisotropy angular power spectrum --- Monte Carlo Apodised Spherical Transform EstimatoR. Originally devised for use in the interpretation of the Boomerang experimental data, MASTER is both a computationally efficient method ...
[ "astro-ph" ]
null
[ "target.author.publication_history.key_reference" ]
null
null
null
15213950
cs/0105028
2001-05-18
When being Weak is Brave: Privacy in Recommender Systems
We explore the conflict between personalization and privacy that arises from the existence of weak ties. A weak tie is an unexpected connection that provides serendipitous recommendations. However, information about weak ties could be used in conjunction with other sources of data to uncover identities and reveal other...
[ "cs.CR", "cs.DS" ]
null
[ "target.author.publication_history" ]
[]
[ { "author_id": "n ramakrishnan_1", "name": "Naren Ramakrishnan", "publication_history": null, "h_index": null, "num_papers": null, "num_citations": null }, { "author_id": "b keller_2", "name": "Benjamin [\"J.\"] Keller", "publication_history": null, "h_index": null, "...
null
1944283
math/0105165
2001-05-20
Anomalous Slow Diffusion from Perpetual Homogenization
This paper is concerned with the asymptotic behavior of solutions of stochastic differential equations $dy_t=d\omega_t -\nabla V(y_t) dt$, $y_0=0$. When $d=1$ and $V$ is not periodic but obtained as a superposition of an infinite number of periodic potentials with geometrically increasing periods ($V(x) = \sum_{k=0}^\i...
[ "math.PR", "math-ph", "math.MP" ]
null
[ "target.author.publication_history", "target.author.publication_history.key_reference" ]
[]
[ { "author_id": "h owhadi_1", "name": "Houman Owhadi", "publication_history": null, "h_index": null, "num_papers": null, "num_citations": null } ]
null
119399506
astro-ph/0105371
2001-05-21
High Frequency Quasi-Periodic Oscillations in the 2000 Outburst of the Galactic Microquasar XTE J1550-564
We present an analysis of the high frequency timing properties of the April-May 2000 outburst of the black hole candidate and Galactic microquasar XTE J1550-564, measured with the Rossi X-ray Timing Explorer. The rapid X-ray variability we measure is consistent with the source being in either the ``very high'' or ``int...
[ "astro-ph" ]
null
[ "target.author.publication_history.key_reference" ]
null
null
null
171709
cs/0105029
2001-05-21
Coloring k-colorable graphs using relatively small palettes
We obtain the following new coloring results: * A 3-colorable graph on $n$ vertices with maximum degree~$\Delta$ can be colored, in polynomial time, using $O((\Delta \log\Delta)^{1/3} \cdot\log{n})$ colors. This slightly improves an $O((\Delta^{{1}/{3}} \log^{1/2}\Delta)\cdot\log{n})$ bound given by Karger, Motwani and...
[ "cs.DS", "cs.CC", "cs.DM" ]
null
[ "target.author.publication_history" ]
[]
[ { "author_id": "e halperin_2", "name": "Eran Halperin", "publication_history": null, "h_index": null, "num_papers": null, "num_citations": null }, { "author_id": "r nathaniel_0", "name": "Ram Nathaniel", "publication_history": null, "h_index": null, "num_papers": null...
null
119484509
hep-th/0105213
2001-05-22
Geometrical phases and quantum numbers of solitons in nonlinear sigma-models
Solitons of a nonlinear field interacting with fermions often acquire a fermionic number or an electric charge if fermions carry a charge. We show how the same mechanism (chiral anomaly) gives solitons statistical and rotational properties of fermions. These properties are encoded in a geometrical phase, i.e., an imagi...
[ "hep-th", "cond-mat" ]
null
[ "target.author.publication_history" ]
[]
[ { "author_id": "a abanov_1", "name": "Alexander [\"G.\"] Abanov", "publication_history": null, "h_index": null, "num_papers": null, "num_citations": null }, { "author_id": "p wiegmann_1", "name": "Paul [\"B.\"] Wiegmann", "publication_history": null, "h_index": null, ...
null
4400478
quant-ph/0105105
2001-05-22
Long-distance quantum communication with atomic ensembles and linear optics
Quantum communication holds a promise for absolutely secure transmission of secret messages and faithful transfer of unknown quantum states. Photonic channels appear to be very attractive for physical implementation of quantum communication. However, due to losses and decoherence in the channel, the communication fidel...
[ "quant-ph" ]
null
[ "target.author.publication_history.key_reference" ]
null
null
null
14365504
quant-ph/0105116
2001-05-23
Quantum Summation with an Application to Integration
We study summation of sequences and integration in the quantum model of computation. We develop quantum algorithms for computing the mean of sequences which satisfy a p-summability condition and for integration of functions from Lebesgue spaces L_p([0,1]^d) and analyze their convergence rates. We also prove lower bound...
[ "quant-ph" ]
null
[ "target.author.publication_history.key_reference" ]
null
null
null
8571795
quant-ph/0105109
2001-05-23
Foundations of quantum physics: a general realistic and operational approach
We present a general formalism with the aim of describing the situation of an entity, how it is, how it reacts to experiments, how we can make statistics with it, and how it changes under the influence of the rest of the universe. Therefore we base our formalism on the following basic notions: (1) the states of the ent...
[ "quant-ph" ]
null
[ "target.author.publication_history.key_reference" ]
null
null
null
8736002
quant-ph/0105108
2001-05-23
State property systems and closure spaces: a study of categorical equivalence
We show that the natural mathematical structure to describe a physical entity by means of its states and its properties within the Geneva-Brussels approach is that of a state property system. We prove that the category of state property systems (and morphisms), SP, is equivalent to the category of closure spaces (and c...
[ "quant-ph" ]
null
[ "target.author.publication_history.key_reference" ]
null
null
null
262577797
quant-ph/0105121
2001-05-23
Proof of security of quantum key distribution with two-way classical communications
Shor and Preskill have provided a simple proof of security of the standard quantum key distribution scheme by Bennett and Brassard (BB84) by demonstrating a connection between key distribution and entanglement purification protocols with one-way communications. Here we provide proofs of security of standard quantum key...
[ "quant-ph" ]
null
[ "target.author.publication_history.key_reference" ]
null
null
null
12152983
math/0105199
2001-05-24
Super-diffusivity in a shear flow model from perpetual homogenization
This paper is concerned with the asymptotic behavior solutions of stochastic differential equations $dy_t=d\omega_t -\nabla \Gamma(y_t) dt$, $y_0=0$ and $d=2$. $\Gamma$ is a $2\times 2$ skew-symmetric matrix associated to a shear flow characterized by an infinite number of spatial scales $\Gamma_{12}=-\Gamma_{21}=h(x_1...
[ "math.PR", "math-ph", "math.AP", "math.MP" ]
null
[ "target.author.publication_history" ]
[]
[ { "author_id": "g ben arous_1", "name": "Gérard Ben Arous", "publication_history": null, "h_index": null, "num_papers": null, "num_citations": null }, { "author_id": "h owhadi_1", "name": "Houman Owhadi", "publication_history": null, "h_index": null, "num_papers": nul...
null
4959291
astro-ph/0105456
2001-05-25
The Stellar Population and Star Clusters in the Unusual Local Group Galaxy IC 10
We present analysis of HST U,V,I, and Halpha images of the peculiar Local Group irregular galaxy IC 10. The images are used to determine the nature of the stellar products in a portion of the recent starburst in this galaxy. We identified 13 stellar associations and clusters, two of which are probably old (>350 Myr) an...
[ "astro-ph" ]
null
[ "target.author.publication_history.key_reference" ]
null
null
null
15085718
astro-ph/0105466
2001-05-26
The Diversity of High- and Intermediate-Velocity Clouds: Complex C versus IV Arch
We present Far Ultraviolet Spectroscopic Explorer (FUSE) and Space Telescope Imaging Spectrograph (STIS) observations of interstellar ultraviolet absorption lines in the Galactic high-velocity cloud Complex C and the Intermediate Velocity Arch (IV Arch) in direction of the quasar PG 1259+593 (l=120,b=+58 deg). Absorpti...
[ "astro-ph" ]
null
[ "target.author.publication_history.key_reference" ]
null
null
null
119107201
astro-ph/0105490
2001-05-28
The Luminosity of SN 1999by in NGC 2841 and the Nature of `Peculiar' Type Ia Supernovae
We present UBVRIJHK photometry and optical spectroscopy of the so-called 'peculiar' Type Ia supernova 1999by in NGC 2841. The observations began one week before visual maximum light which is well-defined by daily observations. The light curves and spectra are similar to those of the prototypical subluminous event SN 19...
[ "astro-ph" ]
null
[ "target.author.publication_history.key_reference" ]
null
null
null
16384056
astro-ph/0105472
2001-05-28
RXTE observations of single pulses of PSR B0531+21 I: Flux variations
This article is the first in the series that analyze about 1.87 million periods of PSR B0531+21 (Crab pulsar), observed by the PCA detector aboard the RXTE x-ray observatory. The Crab pulsar's x-ray light curve shows little variation over time scales ranging from days to a period (33.46 milli seconds). The standard dev...
[ "astro-ph" ]
null
[ "target.author.publication_history.key_reference" ]
null
null
null
2845421
math/0105236
2001-05-28
Harmonic mean, random polynomials and stochastic matrices
Motivated by a problem in learning theory, we are led to study the dominant eigenvalue of a class of random matrices. This turns out to be related to the roots of the derivative of random polynomials (generated by picking their roots uniformly at random in the interval [0, 1], although our results extend to other distr...
[ "math.PR", "cs.LG", "math.CA", "math.CO", "math.DS" ]
null
[ "target.author.publication_history.key_reference" ]
null
null
null
1047895
math/0105248
2001-05-29
Quicksort asymptotics
The number of comparisons X_n used by Quicksort to sort an array of n distinct numbers has mean mu_n of order n log n and standard deviation of order n. Using different methods, Regnier and Roesler each showed that the normalized variate Y_n := (X_n - mu_n) / n converges in distribution, say to Y; the distribution of Y...
[ "math.PR" ]
null
[ "target.key_reference" ]
null
null
null
8268038
physics/0105099
2001-05-29
Performance of a large limited streamer tube cell in drift mode
The performance of a large (3x3 $cm^2$) streamer tube cell in drift mode is shown. The detector space resolution has been studied using cosmic muons crossing an high precision silicon telescope. The experimental results are compared with a GARFIELD simulation.
[ "physics.ins-det" ]
null
[ "target.author.publication_history" ]
[]
[ { "author_id": "g battistoni_1", "name": "Giuseppe Battistoni", "publication_history": null, "h_index": null, "num_papers": null, "num_citations": null }, { "author_id": "m caccia_1", "name": "Massimo Caccia", "publication_history": null, "h_index": null, "num_papers"...
null
11701694
math/0105240
2001-05-29
Scale Invariance of the PNG Droplet and the Airy Process
We establish that the static height fluctuations of a particular growth model, the PNG droplet, converges upon proper rescaling to a limit process, which we call the Airy process A(y). The Airy process is stationary, it has continuous sample paths, its single "time" (fixed y) distribution is the Tracy-Widom distributio...
[ "math.PR", "cond-mat.stat-mech" ]
null
[ "target.author.publication_history.key_reference" ]
null
null
null
1795850
quant-ph/0105141
2001-05-29
Strictly contractive quantum channels and physically realizable quantum computers
We study the robustness of quantum computers under the influence of errors modelled by strictly contractive channels. A channel $T$ is defined to be strictly contractive if, for any pair of density operators $\rho,\sigma$ in its domain, $\| T\rho - T\sigma \|_1 \le k \| \rho-\sigma \|_1$ for some $0 \le k < 1$ (here $\...
[ "quant-ph" ]
null
[ "target.author.publication_history" ]
[]
[ { "author_id": "m raginsky_1", "name": "Maxim Raginsky", "publication_history": null, "h_index": null, "num_papers": null, "num_citations": null } ]
null
15760705
astro-ph/0105500
2001-05-29
The 2dF Galaxy Redshift Survey: Luminosity dependence of galaxy clustering
We investigate the dependence of the strength of galaxy clustering on intrinsic luminosity using the Anglo-Australian two degree field galaxy redshift survey (2dFGRS). The 2dFGRS is over an order of magnitude larger than previous redshift surveys used to address this issue. We measure the projected two-point correlatio...
[ "astro-ph" ]
null
[ "target.author.publication_history.key_reference" ]
null
null
null
17382416
hep-th/0105309
2001-05-30
Multiple-Trace Operators and Non-Local String Theories
We propose that a novel deformation of string perturbation theory, involving non-local interactions between strings, is required to describe the gravity duals of field theories deformed by multiple-trace operators. The new perturbative expansion involves a new parameter, which is neither the string coupling nor the coe...
[ "hep-th" ]
null
[ "target.author.publication_history.key_reference" ]
null
null
null
17581461
astro-ph/0105511
2001-05-30
Solar System Objects Observed in the SDSS Commissioning Data
We discuss measurements of the properties of about 10,000 asteroids detected in 500 deg2 of sky in the Sloan Digital Sky Survey (SDSS) commissioning data. The moving objects are detected in the magnitude range 14 < r < 21.5, with a baseline of 5 minutes. Extensive tests show that the sample is at least 98% complete, wi...
[ "astro-ph" ]
null
[ "target.author.publication_history.key_reference" ]
null
null
null
6015658
astro-ph/0105535
2001-05-30
An Efficient Algorithm for Positioning Tiles in the Sloan Digital Sky Survey
The Sloan Digital Sky Survey (SDSS) will observe around 10^6 spectra from targets distributed over an area of about 10,000 square degrees, using a multi-object fiber spectrograph which can simultaneously observe 640 objects in a circular field-of-view (referred to as a ``tile'') 1.49 degrees in radius. No two fibers ca...
[ "astro-ph" ]
null
[ "target.author.publication_history.key_reference" ]
null
null
null
2687878
cond-mat/0105609
2001-05-31
Finite-size effects on the Hamiltonian dynamics of the XY-model
The dynamical properties of the finite-size magnetization M in the critical region T<T_{KTB} of the planar rotor model on a L x L square lattice are analyzed by means of microcanonical simulations . The behavior of the q=0 structure factor at high frequencies is consistent with field-theoretical results, but new additi...
[ "cond-mat.stat-mech" ]
null
[ "target.author.publication_history" ]
[]
[ { "author_id": "s lepri_2", "name": "Stefano Lepri", "publication_history": null, "h_index": null, "num_papers": null, "num_citations": null }, { "author_id": "s ruffo_1", "name": "Stefano Ruffo", "publication_history": null, "h_index": null, "num_papers": null, "...
null
269952
math/0105258
2001-05-31
Multi-scale homogenization with bounded ratios and Anomalous Slow Diffusion
We show that the effective diffusivity matrix $D(V^n)$ for the heat operator $\partial_t-(\Delta/2-\nabla V^n \nabla)$ in a periodic potential $V^n=\sum_{k=0}^n U_k(x/R_k)$ obtained as a superposition of Holder-continuous periodic potentials $U_k$ (of period $\T^d:=\R^d/\Z^d$, $d\in \N^*$, $U_k(0)=0$) decays exponentia...
[ "math.PR", "math-ph", "math.AP", "math.MP" ]
null
[ "target.author.publication_history" ]
[ { "corpus_id": "1944283", "num_citations": null } ]
[ { "author_id": "g ben arous_1", "name": "Gérard Ben Arous", "publication_history": null, "h_index": null, "num_papers": null, "num_citations": null }, { "author_id": "h owhadi_1", "name": "Houman Owhadi", "publication_history": null, "h_index": null, "num_papers": nul...
null
1762
cs/0105037
2001-05-31
Integrating Prosodic and Lexical Cues for Automatic Topic Segmentation
We present a probabilistic model that uses both prosodic and lexical cues for the automatic segmentation of speech into topically coherent units. We propose two methods for combining lexical and prosodic information using hidden Markov models and decision trees. Lexical information is obtained from a speech recognizer,...
[ "cs.CL" ]
null
[ "target.author.publication_history" ]
[]
[ { "author_id": "g tür_1", "name": "Gökhan Tür", "publication_history": null, "h_index": null, "num_papers": null, "num_citations": null }, { "author_id": "d hakkani-tür_1", "name": "Dilek [\"Z.\"] Hakkani-Tür", "publication_history": null, "h_index": null, "num_papers...
null
16997602
hep-th/0106012
2001-06-01
Supergravity Supertubes
We find the supergravity solution sourced by a supertube: a (1/4)-supersymmetric D0-charged IIA superstring that has been blown up to a cylindrical D2-brane by angular momentum. The supergravity solution captures all essential features of the supertube, including the D2-dipole moment and an upper bound on the angular m...
[ "hep-th" ]
null
[ "target.author.publication_history.key_reference" ]
null
null
null
17027507
nucl-ex/0106003
2001-06-01
Response of CsI(Tl) scintillators over a large range in energy and atomic number of ions (Part II): calibration and identification in the INDRA array
The light output of the 324 CsI(Tl) scintillators of INDRA has been measured over a large range both in energy: 1 - 80 AMeV and in atomic number of incident ions: Z = 1 - 60. An analytical expression for the nonlinear total light response as a function of the energy and the identity of the ion is proposed. It depends o...
[ "nucl-ex" ]
null
[ "target.author.publication_history" ]
[]
[ { "author_id": "m pârlog_1", "name": "Marian Pârlog", "publication_history": null, "h_index": null, "num_papers": null, "num_citations": null }, { "author_id": "b borderie_1", "name": "Bernard Borderie", "publication_history": null, "h_index": null, "num_papers": null...
null
17706227
hep-ex/0106012
2001-06-02
Searches for New Physics in Events with a Photon and b-quark Jet at CDF
We have searched for evidence of physics beyond the standard model in events that include an energetic photon and an energetic b-quark jet, produced in 85pb of ppbar collisions at 1.8 TeV at the Tevatron Collider at Fermilab. This signature, containing at least one gauge boson and a third-generation quark, could arise ...
[ "hep-ex" ]
null
[ "target.author.publication_history" ]
[]
[ { "author_id": "t affolder_1", "name": "Tony Affolder", "publication_history": null, "h_index": null, "num_papers": null, "num_citations": null }, { "author_id": "h akimoto_1", "name": "H. Akimoto", "publication_history": null, "h_index": null, "num_papers": null, ...
null
2907543
nucl-ex/0106004
2001-06-03
Multiplicity distribution and spectra of negatively charged hadrons in Au+Au collisions at sqrt(s_nn) = 130 GeV
The minimum bias multiplicity distribution and the transverse momentum and pseudorapidity distributions for central collisions have been measured for negative hadrons (h-) in Au+Au interactions at sqrt(s_nn) = 130 GeV. The multiplicity density at midrapidity for the 5% most central interactions is dNh-/deta|_{eta = 0} ...
[ "nucl-ex" ]
null
[ "target.author.publication_history" ]
[]
[ { "author_id": "c adler_1", "name": "Clemens Adler", "publication_history": null, "h_index": null, "num_papers": null, "num_citations": null }, { "author_id": "z ahammed_1", "name": "Zubayer Ahammed", "publication_history": null, "h_index": null, "num_papers": null, ...
null
1932201
math/0106024
2001-06-04
Multivariable cochain operations and little n-cubes
This is a revision of a paper first posted June 4, 2001. It will appear in the Journal of the AMS. In this paper we construct a small $E_\infty$ chain operad $\S$ which acts naturally on the normalized cochains $S^*X$ of a topological space. We also construct, for each $n$, a suboperad $\S_n$ which is quasi-isomorphic ...
[ "math.QA", "math.AT" ]
null
[ "target.author.publication_history.key_reference" ]
null
null
null
13284509
hep-th/0106030
2001-06-04
Why Matrix theory works for oddly shaped membranes
We give a simple proof of why there is a Matrix theory approximation for a membrane shaped like an arbitrary Riemann surface. As corollaries, we show that noncompact membranes cannot be approximated by matrices and that the Poisson algebra on any compact phase space is U(infinity). The matrix approximation does not app...
[ "hep-th" ]
null
[ "target.author.publication_history" ]
[]
[ { "author_id": "y zunger_1", "name": "Yonatan Zunger", "publication_history": null, "h_index": null, "num_papers": null, "num_citations": null } ]
null
18158849
astro-ph/0106044
2001-06-04
The AIRES system for air shower simulations. An update
A report on the characteristics of ultra-high energy air showers simulated with the current version of the AIRES program is presented. The AIRES system includes a fast simulating program, originally designed on the basis of the well-known MOCCA program, and progressively improved and tested. The AIRES algorithms are br...
[ "astro-ph", "hep-ph" ]
null
[ "target.author.publication_history.key_reference" ]
null
null
null
6788012
quant-ph/0106024
2001-06-05
Bell inequalities for arbitrarily high dimensional systems
We develop a novel approach to Bell inequalities based on a constraint that the correlations exhibited by local realistic theories must satisfy. This is used to construct a family of Bell inequalities for bipartite quantum systems of arbitrarily high dimensionality which are strongly resistant to noise. In particular o...
[ "quant-ph" ]
null
[ "target.author.publication_history.key_reference" ]
null
null
null
119528854
cond-mat/0106062
2001-06-05
Emptiness Formation Probability for the One-Dimensional Isotropic XY Model
We study a correlation function for the one-dimensional isotropic ${XY}$ model (${XX0}$ model), which is called the Emptiness Formation Probability (EFP). It is the probability of the formation of a ferromagnetic string in the anti-ferromagnetic ground state. Using the expression of the EFP as a Toeplitz determinant, w...
[ "cond-mat.stat-mech", "hep-th", "nlin.SI" ]
null
[ "target.author.publication_history.key_reference" ]
null
null
null
6212147
math/0106036
2001-06-05
Basic properties of SLE
SLE is a random growth process based on Loewner's equation with driving parameter a one-dimensional Brownian motion running with speed $\kappa$. This process is intimately connected with scaling limits of percolation clusters and with the outer boundary of Brownian motion, and is conjectured to correspond to scaling li...
[ "math.PR", "math-ph", "math.CV", "math.MP" ]
null
[ "target.author.publication_history.key_reference" ]
null
null
null
8459650
quant-ph/0106019
2001-06-05
Degrees of concealment and bindingness in quantum bit commitment protocols
Although it is impossible for a bit commitment protocol to be both arbitrarily concealing and arbitrarily binding, it is possible for it to be both partially concealing and partially binding. This means that Bob cannot, prior to the beginning of the unveiling phase, find out everything about the bit committed, and Alic...
[ "quant-ph" ]
null
[ "target.author.publication_history", "target.author.publication_history.key_reference" ]
[]
[ { "author_id": "r spekkens_1", "name": "Robert [\"W.\"] Spekkens", "publication_history": null, "h_index": null, "num_papers": null, "num_citations": null }, { "author_id": "t rudolph_1", "name": "Terry Rudolph", "publication_history": null, "h_index": null, "num_pape...
null
17611279
astro-ph/0106097
2001-06-06
High-resolution O VI absorption line observations at 1.2 < z < 1.7 in the bright QSO HE 0515-4414
STIS Echelle observations at a resolution of 10 km/s and UVES/VLT spectroscopy at a resolution of 7 km/s of the luminous QSO HE 0515-4414 (z_em = 1.73, B = 15.0) reveal four intervening O VI absorption systems in the redshift range 1.2 < z_abs < 1.7 (1.38503, 1.41601, 1.60175, 1.67359). In addition two associated syste...
[ "astro-ph" ]
null
[ "target.author.publication_history.key_reference" ]
[]
[ { "author_id": "d reimers_1", "name": "Dieter Reimers", "publication_history": null, "h_index": null, "num_papers": null, "num_citations": null }, { "author_id": "r baade_0", "name": "Robert [\"A.\"] Baade", "publication_history": null, "h_index": null, "num_papers": ...
null
16978171
astro-ph/0106094
2001-06-06
First Results of the EDELWEISS WIMP Search using a 320 g Heat-and-Ionization Ge Detector
The EDELWEISS collaboration has performed a direct search for WIMP dark matter using a 320 g heat-and-ionization cryogenic Ge detector operated in a low-background environment in the Laboratoire Souterrain de Modane. No nuclear recoils are observed in the fiducial volume in the 30-200 keV energy range during an effecti...
[ "astro-ph" ]
null
[ "target.author.publication_history" ]
[]
[ { "author_id": "a benoit_1", "name": "Alain Benoit", "publication_history": null, "h_index": null, "num_papers": null, "num_citations": null }, { "author_id": "l bergé_1", "name": "Laurent Bergé", "publication_history": null, "h_index": null, "num_papers": null, "...
null
53142414
cond-mat/0106115
2001-06-06
The World of the Complex Ginzburg-Landau Equation
The cubic complex Ginzburg-Landau equation is one of the most-studied nonlinear equations in the physics community. It describes a vast variety of phenomena from nonlinear waves to second-order phase transitions, from superconductivity, superfluidity and Bose-Einstein condensation to liquid crystals and strings in fiel...
[ "cond-mat.stat-mech", "cond-mat.mtrl-sci", "cond-mat.soft" ]
null
[ "target.author.publication_history.key_reference" ]
null
null
null
60545
cond-mat/0106096
2001-06-06
Statistical mechanics of complex networks
Complex networks describe a wide range of systems in nature and society, much quoted examples including the cell, a network of chemicals linked by chemical reactions, or the Internet, a network of routers and computers connected by physical links. While traditionally these systems were modeled as random graphs, it is i...
[ "cond-mat.stat-mech", "cond-mat.dis-nn", "cs.NI", "math-ph", "math.MP", "nlin.AO", "physics.data-an" ]
null
[ "target.author.publication_history.key_reference", "target.key_reference" ]
null
null
null
15677978
cond-mat/0106125
2001-06-07
Statistical Mechanics of an NP-complete Problem: Subset Sum
We study statistical properties of an NP-complete problem, the subset sum, using the methods and concepts of statistical mechanics. The problem is a generalization of the number partitioning problem, which is also an NP-complete problem and has been studied in the physics literature. The asymptotic expressions for the ...
[ "cond-mat.stat-mech", "cond-mat.dis-nn" ]
null
[ "target.author.publication_history.key_reference" ]
null
null
null
429546
cond-mat/0106144
2001-06-07
Evolution of networks
We review the recent fast progress in statistical physics of evolving networks. Interest has focused mainly on the structural properties of random complex networks in communications, biology, social sciences and economics. A number of giant artificial networks of such a kind came into existence recently. This opens a w...
[ "cond-mat.stat-mech", "q-bio" ]
null
[ "target.author.publication_history.key_reference" ]
null
null
null