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16629980
astro-ph/0008490
2000-08-30
How many young star clusters exist in the Galactic center?
We study the evolution and observability of young compact star clusters within about 200pc of the Galactic center. Calculations are performed using direct N-body integration on the GRAPE-4, including the effects of both stellar and binary evolution and the external influence of the Galaxy. The results of these detailed...
[ "astro-ph" ]
null
[ "target.author.publication_history.key_reference" ]
null
null
null
11267384
astro-ph/0008472
2000-08-30
ASTRO-F - The next generation of mid-infrared surveys
We present basic observational strategies for ASTRO-F (also known as the Imaging Infra Red Surveyor (IRIS)) to be launched in 2004 by the Japanese Institute of Space and Astronautical Science (ISAS). We examine 2 survey scenarios, a deep ~1sq.deg. survey reaching sensitivities an order of magnitude below than the deepe...
[ "astro-ph" ]
null
[ "target.author.publication_history.key_reference" ]
null
null
null
63346
cs/0008034
2000-08-30
Lexicalized Stochastic Modeling of Constraint-Based Grammars using Log-Linear Measures and EM Training
We present a new approach to stochastic modeling of constraint-based grammars that is based on log-linear models and uses EM for estimation from unannotated data. The techniques are applied to an LFG grammar for German. Evaluation on an exact match task yields 86% precision for an ambiguity rate of 5.4, and 90% precisi...
[ "cs.CL" ]
null
[ "target.author.publication_history" ]
[]
[ { "author_id": "s riezler_1", "name": "Stefan Riezler", "publication_history": null, "h_index": null, "num_papers": null, "num_citations": null }, { "author_id": "d prescher_1", "name": "Detlef Prescher", "publication_history": null, "h_index": null, "num_papers": nul...
null
118872793
hep-ph/0008322
2000-08-30
Monopoles and Dyons in SU(5) Gauge Unification (with relation to a Dual Standard Model)
This article presents a fairly complete description of the monopoles and dyons arising from an SU(5) gauge unification of the standard model. Topics discussed include: the spectrum of SU(5) monopoles; their gauge equivalence structure; their spherical symmetry; the construction of dyons; global charge; the intrinsic an...
[ "hep-ph", "hep-th" ]
null
[ "target.author.publication_history" ]
[]
[ { "author_id": "n lepora_1", "name": "Nathan [\"F.\"] Lepora", "publication_history": null, "h_index": null, "num_papers": null, "num_citations": null } ]
null
18866395
cond-mat/0008461
2000-08-31
Selective quantum evolution of a qubit state due to continuous measurement
We consider a two-level quantum system (qubit) which is continuously measured by a detector. The information provided by the detector is taken into account to describe the evolution during a particular realization of measurement process. We discuss the Bayesian formalism for such ``selective'' evolution of an individua...
[ "cond-mat.mes-hall", "quant-ph" ]
null
[ "target.author.publication_history.key_reference" ]
null
null
null
6224131
astro-ph/0008518
2000-08-31
Particle reacceleration in Coma cluster: radio properties and hard X-ray emission
The radio spectral index map of the Coma halo shows a progressive steepening of the spectral index with increasing radius. Such a steepening cannot be simply justified by models involving continuous injection of fresh particles in the Coma halo or by models involving diffusion of fresh electrons from the central region...
[ "astro-ph" ]
null
[ "target.author.publication_history.key_reference" ]
null
null
null
16317577
astro-ph/0009016
2000-09-01
Redshift space bias and beta from the halo model
We analyze scale dependence of redshift space bias $b$ and $\beta \equiv \Omega_m^{0.6}/b$ in the context of the halo model. We show that linear bias is a good approximation only on large scales, for $k<0.1h$Mpc$^{-1}$. On intermediate scales the virial motions of the galaxies cause a suppression of the power spectrum ...
[ "astro-ph" ]
null
[ "target.author.publication_history" ]
[ { "corpus_id": "10389333", "num_citations": null }, { "corpus_id": "9407933", "num_citations": null } ]
[ { "author_id": "u seljak_2", "name": "Uroš Seljak", "publication_history": null, "h_index": null, "num_papers": null, "num_citations": null } ]
null
15483320
hep-ph/9903236
2000-09-02
Colour Octet Contribution in Exclusive P-Wave Charmonium Decay into Octet and Decuplet Baryons
In the last years, the need of the colour octet state in inclusive P-wave charmonium decay has been firmly established. However, the implications of this in the corresponding exclusive reactions have not been fully recognized. We argue for the necessity of the colour octet in P- and higher-wave quarkonium decay. Using ...
[ "hep-ph" ]
null
[ "target.author.publication_history.key_reference" ]
null
null
null
18758530
math/0009026
2000-09-03
Max-Min Representation of Piecewise Linear Functions
It is shown that a piecewise linear function can be represented as a Max-Min polynomial of its linear components.
[ "math.CO" ]
null
[ "target.author.publication_history.key_reference", "target.key_reference" ]
null
null
null
120230853
gr-qc/0009006
2000-09-04
Circular Cosmic String Loop in Brans-Dicke Theory
The gravitational field of a stationary circular cosmic string loop ,externally supported against collapse, is investigated in the context of Brans-Dicke theory in the weak field approximation of the field equations. The solution is quasi-conformally related to the corresponding solution in Einstein's General Relativit...
[ "gr-qc" ]
null
[ "target.author.publication_history" ]
[]
[ { "author_id": "a barros_4", "name": "Adriano Barros", "publication_history": null, "h_index": null, "num_papers": null, "num_citations": null }, { "author_id": "a sen_2", "name": "Anjan [\"Ananda\"] Sen", "publication_history": null, "h_index": null, "num_papers": nu...
null
16489484
gr-qc/0009008
2000-09-04
Accelerating Universes with Scaling Dark Matter
Friedmann-Robertson-Walker universes with a presently large fraction of the energy density stored in an $X$-component with $w_X<-1/3$, are considered. We find all the critical points of the system for constant equations of state in that range. We consider further several background quantities that can distinguish the m...
[ "gr-qc", "astro-ph" ]
null
[ "target.author.publication_history.key_reference" ]
null
null
null
122710749
hep-ex/0009012
2000-09-05
Ratios of Multijet Cross Sections in p-pbar Collisions at sqrt(s)=1.8 TeV
We report on a study of the ratio of inclusive three-jet to inclusive two-jet production cross sections as a function of total transverse energy in p-pbar collisions at a center-of-mass energy sqrt{s} = 1.8 TeV, using data collected with the D0 detector during the 1992-1993 run of the Fermilab Tevatron Collider. The me...
[ "hep-ex" ]
null
[ "target.author.publication_history" ]
[]
[ { "author_id": "b abbott_2", "name": "B. Abbott", "publication_history": null, "h_index": null, "num_papers": null, "num_citations": null }, { "author_id": "m abolins_1", "name": "Maris [\"A.\"] Abolins", "publication_history": null, "h_index": null, "num_papers": nul...
null
16103064
cond-mat/0009063
2000-09-05
BAs and boride III-V alloys
Boron arsenide, the typically-ignored member of the III-V arsenide series BAs-AlAs-GaAs-InAs is found to resemble silicon electronically: its Gamma conduction band minimum is p-like (Gamma_15), not s-like (Gamma_1c), it has an X_1c-like indirect band gap, and its bond charge is distributed almost equally on the two ato...
[ "cond-mat.mtrl-sci" ]
null
[ "target.author.publication_history" ]
[]
[ { "author_id": "g hart_1", "name": "Gus [\"L.\",\"W.\"] Hart", "publication_history": null, "h_index": null, "num_papers": null, "num_citations": null }, { "author_id": "a zunger_1", "name": "Alex Zunger", "publication_history": null, "h_index": null, "num_papers": nu...
null
16239740
hep-ex/0009010
2000-09-05
Search for Charged Higgs Bosons in e+e- Collisions at Centre-of-Mass Energies up to 202 GeV
A search for pair-produced charged Higgs bosons is performed with the L3 detector at LEP using data collected at centre-of-mass energies between 192 and 202 GeV, corresponding to an integrated luminosity of 233.2 pb^-1. Decays into a charm and a strange quark or into a tau lepton and its neutrino are considered. The ob...
[ "hep-ex" ]
null
[ "target.author.publication_history" ]
[]
[ { "author_id": "m acciarri_1", "name": "M. Acciarri", "publication_history": null, "h_index": null, "num_papers": null, "num_citations": null }, { "author_id": "p achard_1", "name": "Pablo Achard", "publication_history": null, "h_index": null, "num_papers": null, ...
null
15324781
astro-ph/0009101
2000-09-06
MACS: A quest for the most massive galaxy clusters in the universe
We describe the design and current status of a new X-ray cluster survey aimed at the compilation of a statistically complete sample of very X-ray luminous (and thus, by inference, massive), distant clusters of galaxies. The primary goal of the MAssive Cluster Survey (MACS) is to increase the number of known massive clu...
[ "astro-ph" ]
null
[ "target.author.publication_history.key_reference" ]
null
null
null
13131106
math/0009048
2000-09-06
Honeycombs and sums of Hermitian matrices
Horn's conjecture, which given the spectra of two Hermitian matrices describes the possible spectra of the sum, was recently settled in the affirmative. In this survey we discuss one of the many steps in this, which required us to introduce a combinatorial gadget called a {\em honeycomb}; the question is then reformula...
[ "math.RT", "math.RA" ]
null
[ "target.author.publication_history.key_reference" ]
null
null
null
5906047
nucl-ex/0009004
2000-09-06
Effect of the intermediate velocity emissions on the quasi-projectile properties for the Ar+Ni system at 95 A.MeV
The quasi-projectile (QP) properties are investigated in the Ar+Ni collisions at 95 A.MeV taking into account the intermediate velocity emission. Indeed, in this reaction, between 52 and 95 A.MeV bombarding energies, the number of particles emitted in the intermediate velocity region is related to the overlap volume be...
[ "nucl-ex" ]
null
[ "target.author.publication_history" ]
[]
[ { "author_id": "d doré_1", "name": "D. Doré", "publication_history": null, "h_index": null, "num_papers": null, "num_citations": null }, { "author_id": "p buchet_1", "name": "Ph. Buchet", "publication_history": null, "h_index": null, "num_papers": null, "num_citat...
null
2405389
cond-mat/0009083
2000-09-06
Double-Occupancy Errors, Adiabaticity, and Entanglement of Spin-Qubits in Quantum Dots
Quantum gates that temporarily increase singlet-triplet splitting in order to swap electronic spins in coupled quantum dots, lead inevitably to a finite double-occupancy probability for both dots. By solving the time-dependent Schr\"odinger equation for a coupled dot model, we demonstrate that this does not necessarily...
[ "cond-mat.mes-hall", "quant-ph" ]
null
[ "target.author.publication_history.key_reference" ]
null
null
null
2871126
physics/0009028
2000-09-07
Slice Sampling
Markov chain sampling methods that automatically adapt to characteristics of the distribution being sampled can be constructed by exploiting the principle that one can sample from a distribution by sampling uniformly from the region under the plot of its density function. A Markov chain that converges to this uniform d...
[ "physics.data-an", "physics.comp-ph" ]
null
[ "target.author.publication_history.key_reference", "target.key_reference" ]
null
null
null
3264730
cs/0009002
2000-09-07
Succinct quantum proofs for properties of finite groups
In this paper we consider a quantum computational variant of nondeterminism based on the notion of a quantum proof, which is a quantum state that plays a role similar to a certificate in an NP-type proof. Specifically, we consider quantum proofs for properties of black-box groups, which are finite groups whose elements...
[ "cs.CC", "quant-ph" ]
null
[ "target.author.publication_history.key_reference" ]
null
null
null
117938760
astro-ph/0009128
2000-09-08
High Speed Interconnects and Parallel Software Libraries: Enabling Technologies for the NVO
The NVOs core data mining and archive federation activities are heavily dependent on the underlying data pipeline software necessary to translate the raw data into scientifically relevant source detections. The data pipeline software dictates: the raw data storage and retrieval mechanisms, the meaning and format of the...
[ "astro-ph" ]
null
[ "target.author.publication_history" ]
[]
[ { "author_id": "j kepner_1", "name": "Jeremy Kepner", "publication_history": null, "h_index": null, "num_papers": null, "num_citations": null } ]
null
118991830
cond-mat/0009130
2000-09-08
Effective Hamiltonians and dilution effects in kagome and related antiferromagnets
What is the zero-temperature ordering pattern of a Heisenberg antiferromagnet with large spin length $S$ (and possibly small dilution), on the kagome lattice, or others built from corner-sharing triangles and tetrahedra? First, I summarize the uses of effective Hamiltonians to resolve the large ground-state degeneracy,...
[ "cond-mat" ]
null
[ "target.author.publication_history.key_reference" ]
null
null
null
119456373
cond-mat/0009141
2000-09-09
Structural response to local charge order in underdoped but superconducting La2-x(Sr,Ba)xCuO4
We report an anomalous local structural response in the CuO2 planes associated with the appearance of charge inhomogeneities at low temperature in underdoped but superconducting La2-x(Sr,Ba)xCuO4. We used pair distribution function analysis of neutron powder diffraction data. The increase in the Cu-O bond length distri...
[ "cond-mat.supr-con" ]
null
[ "target.author.publication_history" ]
[]
[ { "author_id": "m gutmann_2", "name": "Matthias [\"J.\"] Gutmann", "publication_history": null, "h_index": null, "num_papers": null, "num_citations": null }, { "author_id": "e bozin_1", "name": "Emil [\"S.\"] Bozin", "publication_history": null, "h_index": null, "num_...
null
119417513
hep-th/0009078
2000-09-11
Bosonic sector of D=11 superstring action and the critical dimension. Toy model
Bosonic model inspired by D=11 superstring action is investigated. An appropriate set of variables is find, in which the light-cone quantization turns out to be possible. It is shown that anomaly terms in the algebra of the light-cone Poincare generators are absent for the case D=27.
[ "hep-th" ]
null
[ "target.author.publication_history" ]
[]
[ { "author_id": "a deriglazov_1", "name": "Alexei [\"A.\"] Deriglazov", "publication_history": null, "h_index": null, "num_papers": null, "num_citations": null } ]
null
18780088
gr-qc/0009034
2000-09-11
Scalar-tensor gravity in an accelerating universe
We consider scalar-tensor theories of gravity in an accelerating universe. The equations for the background evolution and the perturbations are given in full generality for any parametrization of the Lagrangian, and we stress that apparent singularities are sometimes artifacts of a pathological choice of variables. Ado...
[ "gr-qc", "astro-ph" ]
null
[ "target.author.publication_history.key_reference" ]
null
null
null
542714
cond-mat/0009165
2000-09-11
Occam factors and model-independent Bayesian learning of continuous distributions
Learning of a smooth but nonparametric probability density can be regularized using methods of Quantum Field Theory. We implement a field theoretic prior numerically, test its efficacy, and show that the data and the phase space factors arising from the integration over the model space determine the free parameter of t...
[ "cond-mat", "cs.LG", "nlin.AO", "physics.data-an" ]
null
[ "target.author.publication_history", "target.author.publication_history.key_reference" ]
[]
[ { "author_id": "i nemenman_1", "name": "Ilya Nemenman", "publication_history": null, "h_index": null, "num_papers": null, "num_citations": null }, { "author_id": "w bialek_1", "name": "William Bialek", "publication_history": null, "h_index": null, "num_papers": null, ...
null
39580667
cond-mat/0009189
2000-09-13
Persistence in higher dimensions : a finite size scaling study
We show that the persistence probability $P(t,L)$, in a coarsening system of linear size $L$ at a time $t$, has the finite size scaling form $P(t,L)\sim L^{-z\theta}f(\frac{t}{L^{z}})$ where $\theta$ is the persistence exponent and $z$ is the coarsening exponent. The scaling function $f(x)\sim x^{-\theta}$ for $x \ll 1...
[ "cond-mat.stat-mech" ]
null
[ "target.author.publication_history.key_reference" ]
null
null
null
118888462
astro-ph/0009217
2000-09-13
The Milky Way in Molecular Clouds: A New Complete CO Survey
New large-scale CO surveys of the first and second Galactic quadrants and the nearby molecular cloud complexes in Orion and Taurus, obtained with the CfA 1.2 m telescope, have been combined with 31 other surveys obtained over the past two decades with that instrument and a similar telescope on Cerro Tololo in Chile, to...
[ "astro-ph" ]
null
[ "target.author.publication_history.key_reference" ]
null
null
null
14592887
hep-th/0009103
2000-09-13
On Exact Tachyon Potential in Open String Field Theory
In these notes we revisit the tachyon lagrangian in the open string field theory using background independent approach of Witten from 1992. We claim that the tree level lagrangian (up to second order in derivatives and modulo some class of field redefinitions) is given by $L = e^{-T} (\partial T)^2 + (1+T)e^{-T}$. Upon...
[ "hep-th" ]
null
[ "target.author.publication_history.key_reference" ]
null
null
null
14645615
astro-ph/0009209
2000-09-13
Mode Generating Mechanism in Inflation with Cutoff
In most inflationary models, space-time inflated to the extent that modes of cosmological size originated as modes of wavelengths at least several orders of magnitude smaller than the Planck length. Recent studies confirmed that, therefore, inflationary predictions for the cosmic microwave background perturbations are ...
[ "astro-ph", "gr-qc", "hep-th" ]
null
[ "target.author.publication_history.key_reference" ]
null
null
null
5415722
cs/0009007
2000-09-13
Robust Classification for Imprecise Environments
In real-world environments it usually is difficult to specify target operating conditions precisely, for example, target misclassification costs. This uncertainty makes building robust classification systems problematic. We show that it is possible to build a hybrid classifier that will perform at least as well as the ...
[ "cs.LG" ]
null
[ "target.author.publication_history.key_reference", "target.key_reference" ]
null
null
null
10913004
cond-mat/0009225
2000-09-14
Long Range Order at Low Temperature in Dipolar Spin Ice
Recently it has been suggested that long range magnetic dipolar interactions are responsible for spin ice behavior in the Ising pyrochlore magnets ${\rm Dy_{2}Ti_{2}O_{7}}$ and ${\rm Ho_{2}Ti_{2}O_{7}}$. We report here numerical results on the low temperature properties of the dipolar spin ice model, obtained via a new...
[ "cond-mat.dis-nn" ]
null
[ "target.author.publication_history", "target.author.publication_history.key_reference" ]
[]
[ { "author_id": "r melko_1", "name": "Roger [\"G.\"] Melko", "publication_history": null, "h_index": null, "num_papers": null, "num_citations": null }, { "author_id": "b hertog_1", "name": "Byron [\"C.\",\"den\"] Hertog", "publication_history": null, "h_index": null, "...
null
525915
astro-ph/0009220
2000-09-14
Models for Multiband IR Surveys
Empirical 'backward' galaxy evolution models for IR-bright galaxies are constrained using multiband IR surveys. A new Monte-Carlo algorithm is developed for this task. It exploits a large library of realistic Spectral Energy Distributions (SEDs) of 837 local IR galaxies (IRAS 25$\mu m$ selected) from the UV (1000{\AA})...
[ "astro-ph" ]
null
[ "target.author.publication_history.key_reference" ]
null
null
null
23521157
quant-ph/0009061
2000-09-14
Experiments towards Falsification of Noncontextual Hidden Variable Theories
We present two experiments testing the hypothesis of noncontextual hidden variables (NCHV's). The first one is based on observation of two-photon pseudo-Greenberger-Horne-Zeilinger correlations, with two of the originally three particles mimicked by the polarization degree of freedom and the spatial degree of freedom o...
[ "quant-ph" ]
null
[ "target.author.publication_history.key_reference" ]
null
null
null
5565100
nlin/0009028
2000-09-15
Uniqueness of the Invariant Measure for a Stochastic PDE Driven by Degenerate Noise
We consider the stochastic Ginzburg-Landau equation in a bounded domain. We assume the stochastic forcing acts only on high spatial frequencies. The low-lying frequencies are then only connected to this forcing through the non-linear (cubic) term of the Ginzburg-Landau equation. Under these assumptions, we show that th...
[ "nlin.CD", "math.PR" ]
null
[ "target.author.publication_history.key_reference" ]
null
null
null
16534837
cond-mat/0009230
2000-09-15
A physicist's approach to number partitioning
The statistical physics approach to the number partioning problem, a classical NP-hard problem, is both simple and rewarding. Very basic notions and methods from statistical mechanics are enough to obtain analytical results for the phase boundary that separates the ``easy-to-solve'' from the ``hard-to-solve'' phase of ...
[ "cond-mat" ]
null
[ "target.author.publication_history.key_reference" ]
null
null
null
13909263
hep-th/0009126
2000-09-15
Instability of charged black holes in anti-de Sitter space
We exhibit a tachyonic mode in a linearized analysis of perturbations of large anti-de Sitter Reissner-Nordstrom black holes in four dimensions. In the large black hole limit, and up to a 0.7% discrepancy which is probably round-off error in the numerical analysis, the tachyon appears precisely when the black hole beco...
[ "hep-th" ]
null
[ "target.author.publication_history.key_reference" ]
null
null
null
8806201
hep-th/0009128
2000-09-15
Quantization of maximally-charged slowly-moving black holes
We discuss the quantization of a system of slowly-moving extreme Reissner-Nordstrom black holes. In the near-horizon limit, this system has been shown to possess an SL(2,R) conformal symmetry. However, the Hamiltonian appears to have no well-defined ground state. This problem can be circumvented by a redefinition of th...
[ "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
724544
cs/0009010
2000-09-18
Computing Crossing Numbers in Quadratic Time
We show that for every fixed non-negative integer k there is a quadratic time algorithm that decides whether a given graph has crossing number at most k and, if this is the case, computes a drawing of the graph in the plane with at most k crossings.
[ "cs.DS", "cs.DM" ]
null
[ "target.author.publication_history.key_reference" ]
null
null
null
53633397
astro-ph/0009277
2000-09-18
Complex Visibilities of Cosmic Microwave Background Anisotropies
We study the complex visibilities of the cosmic microwave background anisotropies that are observables in interferometric observations of the cosmic microwave background, using the multipole expansion methods commonly adopted in analyzing single-dish experiments. This allows us to recover the properties of the visibili...
[ "astro-ph" ]
null
[ "target.author.publication_history.key_reference" ]
null
null
null
8940645
cs/0009008
2000-09-18
Introduction to the CoNLL-2000 Shared Task: Chunking
We describe the CoNLL-2000 shared task: dividing text into syntactically related non-overlapping groups of words, so-called text chunking. We give background information on the data sets, present a general overview of the systems that have taken part in the shared task and briefly discuss their performance.
[ "cs.CL" ]
null
[ "target.author.publication_history.key_reference" ]
null
null
null
1010510
cs/0009009
2000-09-18
Learning to Filter Spam E-Mail: A Comparison of a Naive Bayesian and a Memory-Based Approach
We investigate the performance of two machine learning algorithms in the context of anti-spam filtering. The increasing volume of unsolicited bulk e-mail (spam) has generated a need for reliable anti-spam filters. Filters of this type have so far been based mostly on keyword patterns that are constructed by hand and pe...
[ "cs.CL", "cs.IR", "cs.LG" ]
null
[ "target.author.publication_history", "target.author.publication_history.key_reference", "target.key_reference" ]
[]
[ { "author_id": "i androutsopoulos_1", "name": "Ion Androutsopoulos", "publication_history": null, "h_index": null, "num_papers": null, "num_citations": null }, { "author_id": "g paliouras_1", "name": "Georgios Paliouras", "publication_history": null, "h_index": null, ...
null
15664546
hep-th/0009148
2000-09-19
Some Exact Results on Tachyon Condensation in String Field Theory
The study of open string tachyon condensation in string field theory can be drastically simplified by making an appropriate choice of coordinates on the space of string fields. We show that a very natural coordinate system is suggested by the connection between the worldsheet renormalization group and spacetime physics...
[ "hep-th" ]
null
[ "target.author.publication_history.key_reference" ]
null
null
null
1528048
cs/0009015
2000-09-20
A Tableaux Calculus for Ambiguous Quantification
Coping with ambiguity has recently received a lot of attention in natural language processing. Most work focuses on the semantic representation of ambiguous expressions. In this paper we complement this work in two ways. First, we provide an entailment relation for a language with ambiguous expressions. Second, we give...
[ "cs.CL" ]
null
[ "target.author.publication_history" ]
[]
[ { "author_id": "c monz_1", "name": "Christof Monz", "publication_history": null, "h_index": null, "num_papers": null, "num_citations": null }, { "author_id": "m de rijke_1", "name": "M. de Rijke", "publication_history": null, "h_index": null, "num_papers": null, "...
null
11113121
hep-ph/0009237
2000-09-20
Bottom-up thermalization in heavy ion collisions
We describe how thermalization occurs in heavy ion collisions in the framework of perturbative QCD. When the saturation scale $Q_s$ is large compared to $\Lambda_{QCD}$, thermalization takes place during a time of order $\alpha^{-13/5}Q_s^{-1}$ and the maximal temperature achieved is $\alpha^{2/5}Q_s$.
[ "hep-ph", "nucl-th" ]
null
[ "target.author.publication_history.key_reference" ]
null
null
null
17035190
astro-ph/0009327
2000-09-20
Magnetic Deformation of Magnetars for the Giant Flares of the Soft Gamma-Ray Repeaters
We present one possible mechanism for the giant flares of the Soft Gamma-Ray Repeaters (SGRs) within the framework of magnetar, i.e., superstrongly magnetized neutron star model, motivated by the positive period increase associated with the August 27 event from SGR 1900+14. From the second-order perturbation analysis o...
[ "astro-ph", "gr-qc" ]
null
[ "target.author.publication_history.key_reference" ]
null
null
null
9083482
math-ph/0009032
2000-09-21
On the concentration of eigenvalues of random symmetric matrices
We prove that few largest (and most important) eigenvalues of random symmetric matrices of various kinds are very strongly concentrated. This strong concentration enables us to compute the means of these eigenvalues with high precision. Our approach uses Talagrand's inequality and is very different from standard approa...
[ "math-ph", "math.MP", "math.PR" ]
null
[ "target.author.publication_history.key_reference" ]
null
null
null
2287195
cs/0009017
2000-09-21
A Tableau Calculus for Pronoun Resolution
We present a tableau calculus for reasoning in fragments of natural language. We focus on the problem of pronoun resolution and the way in which it complicates automated theorem proving for natural language processing. A method for explicitly manipulating contextual information during deduction is proposed, where prono...
[ "cs.CL", "cs.AI" ]
null
[ "target.author.publication_history" ]
[]
[ { "author_id": "c monz_1", "name": "Christof Monz", "publication_history": null, "h_index": null, "num_papers": null, "num_citations": null }, { "author_id": "m de rijke_1", "name": "M. de Rijke", "publication_history": null, "h_index": null, "num_papers": null, "...
null
57084
cs/0009018
2000-09-21
A Resolution Calculus for Dynamic Semantics
This paper applies resolution theorem proving to natural language semantics. The aim is to circumvent the computational complexity triggered by natural language ambiguities like pronoun binding, by interleaving pronoun binding with resolution deduction. Therefore disambiguation is only applied to expression that actual...
[ "cs.CL", "cs.AI" ]
null
[ "target.author.publication_history" ]
[]
[ { "author_id": "c monz_1", "name": "Christof Monz", "publication_history": null, "h_index": null, "num_papers": null, "num_citations": null }, { "author_id": "m de rijke_1", "name": "M. de Rijke", "publication_history": null, "h_index": null, "num_papers": null, "...
null
480741
cs/0009022
2000-09-22
A Comparison between Supervised Learning Algorithms for Word Sense Disambiguation
This paper describes a set of comparative experiments, including cross-corpus evaluation, between five alternative algorithms for supervised Word Sense Disambiguation (WSD), namely Naive Bayes, Exemplar-based learning, SNoW, Decision Lists, and Boosting. Two main conclusions can be drawn: 1) The LazyBoosting algorithm ...
[ "cs.CL", "cs.AI" ]
null
[ "target.author.publication_history" ]
[ { "corpus_id": "2353613", "num_citations": null }, { "corpus_id": "59986", "num_citations": null }, { "corpus_id": "1580335", "num_citations": null }, { "corpus_id": "1206", "num_citations": null }, { "corpus_id": "3263109", "num_citations": null } ]
[ { "author_id": "g escudero_1", "name": "Gerard Escudero", "publication_history": null, "h_index": null, "num_papers": null, "num_citations": null }, { "author_id": "l villodre_1", "name": "Lluís [\"Màrquez\",\"i\"] Villodre", "publication_history": null, "h_index": null, ...
null
9342154
cond-mat/0009364
2000-09-22
Local Atomic Strain in ZnSe(1-x)Te(x) from High Real Space Resolution Neutron Pair Distribution Function Measurements
High real-space resolution atomic pair distribution functions (PDFs) have been obtained from ZnSe(1-x)Te(x) using neutron powder diffraction. Distinct Zn-Se and Zn-Te nearest neighbor (nn) bonds, differing in length by delta_r= 0.14Angstroms, are resolved in the measured PDF allowing the evolution with composition of t...
[ "cond-mat.mtrl-sci" ]
null
[ "target.author.publication_history" ]
[]
[ { "author_id": "p peterson_0", "name": "Peter [\"F.\"] Peterson", "publication_history": null, "h_index": null, "num_papers": null, "num_citations": null }, { "author_id": "t proffen_1", "name": "Th. Proffen", "publication_history": null, "h_index": null, "num_papers"...
null
11002434
cs/0009021
2000-09-22
Nimrod/G: An Architecture of a Resource Management and Scheduling System in a Global Computational Grid
The availability of powerful microprocessors and high-speed networks as commodity components has enabled high performance computing on distributed systems (wide-area cluster computing). In this environment, as the resources are usually distributed geographically at various levels (department, enterprise, or worldwide) ...
[ "cs.DC" ]
null
[ "target.author.publication_history.key_reference" ]
null
null
null
15275507
cond-mat/0009382
2000-09-25
Large-scale low-energy excitations in 3-d spin glasses
We numerically extract large-scale excitations above the ground state in the 3-dimensional Edwards-Anderson spin glass with Gaussian couplings. We find that associated energies are O(1), in agreement with the mean field picture. Of further interest are the position-space properties of these excitations. First, our stud...
[ "cond-mat.dis-nn" ]
null
[ "target.author.publication_history" ]
[ { "corpus_id": "119010132", "num_citations": null }, { "corpus_id": "1861225", "num_citations": null }, { "corpus_id": "30264583", "num_citations": null } ]
[ { "author_id": "j houdayer_1", "name": "Jérôme Houdayer", "publication_history": null, "h_index": null, "num_papers": null, "num_citations": null }, { "author_id": "f krzakala_1", "name": "Florent Krzakala", "publication_history": null, "h_index": null, "num_papers": ...
null
119398064
hep-ex/0009052
2000-09-25
Combined results on b-hadron production rates, lifetimes, oscillations and semileptonic decays
Combined results on b-hadron lifetimes, b-hadron production rates, B^0_d - \bar{B^0_d} and B^0_s -\bar{B^0_s} oscillations, the decay width difference between the mass eigenstates of the B^0_s -\bar{B^0_s} system, and the values of the CKM matrix elements | V_cb | and \Vert V_ub | are obtained from published and prelim...
[ "hep-ex", "hep-ph" ]
null
[ "target.author.publication_history.key_reference" ]
null
null
null
15034491
quant-ph/0009100
2000-09-25
Quantaloids Describing Causation and Propagation of Physical Properties
A general principle of `causal duality' for physical systems, lying at the base of representation theorems for both compound and evolving systems, is proved; formally it is encoded in a quantaloidal setting. Other particular examples of quantaloids and quantaloidal morphisms appear naturally within this setting; as in ...
[ "quant-ph", "math-ph", "math.CT", "math.LO", "math.MP" ]
null
[ "target.author.publication_history.key_reference" ]
null
null
null
15123736
astro-ph/0009427
2000-09-26
A Fitting Formula for the Non-Linear Evolution of the Bispectrum
We present a fitting formula for the non-linear evolution of the bispectrum in CDM models, obtained from measurements in high resolution numerical simulations. The formula interpolates between the perturbative and highly non-linear regimes, and generalizes previous results obtained for scale-free initial conditions.
[ "astro-ph" ]
null
[ "target.author.publication_history.key_reference" ]
null
null
null
117865372
astro-ph/0009423
2000-09-26
Evidence for a Long-period Planet Orbiting Epsilon Eridani
High precision radial velocity (RV) measurements spanning the years 1980.8--2000.0 are presented for the nearby (3.22 pc) K2 V star $\epsilon$ Eri. These data, which represent a combination of six independent data sets taken with four different telescopes, show convincing variations with a period of $\approx$ 7 yrs. A ...
[ "astro-ph" ]
null
[ "target.author.publication_history.key_reference" ]
null
null
null
263788985
quant-ph/0009117
2000-09-28
Optimal states and almost optimal adaptive measurements for quantum interferometry
We derive the optimal N-photon two-mode input state for obtaining an estimate \phi of the phase difference between two arms of an interferometer. For an optimal measurement [B. C. Sanders and G. J. Milburn, Phys. Rev. Lett. 75, 2944 (1995)], it yields a variance (\Delta \phi)^2 \simeq \pi^2/N^2, compared to O(N^{-1}) o...
[ "quant-ph" ]
null
[ "target.author.publication_history.key_reference" ]
null
null
null
310346
cond-mat/0009448
2000-09-28
Simulating Dynamical Features of Escape Panic
One of the most disastrous forms of collective human behaviour is the kind of crowd stampede induced by panic, often leading to fatalities as people are crushed or trampled. Sometimes this behaviour is triggered in life-threatening situations such as fires in crowded buildings; at other times, stampedes can arise from ...
[ "cond-mat.stat-mech", "cond-mat.soft" ]
null
[ "target.author.publication_history.key_reference" ]
null
null
null
7045853
cond-mat/0009456
2000-09-29
Quantum Criticality: competing ground states in low dimensions
Small changes in an external parameter can often lead to dramatic qualitative changes in the lowest energy quantum mechanical ground state of a correlated electron system. In anisotropic crystals, such as the high temperature superconductors where electron motion occurs primarily on a two-dimensional square lattice, th...
[ "cond-mat.str-el", "cond-mat.supr-con" ]
null
[ "target.author.publication_history.key_reference" ]
null
null
null
13124504
cond-mat/0009462
2000-09-29
Elastic Response of Rough Surfaces in Partial Contact
We model numerically the partial normal contact of two elastic rough surfaces with highly correlated asperities. Facing surfaces are unmated and described as self-affine with a Hurst exponent H. The numerical algorithm is based on Fourier acceleration and allows efficient simulation of very large systems. The force, F,...
[ "cond-mat" ]
null
[ "target.author.publication_history.key_reference" ]
null
null
null
14089843
cond-mat/0010010
2000-10-02
Discrete energy landscapes and replica symmetry breaking at zero temperature
The order parameter P(q) for disordered systems with degenerate ground-states is reconsidered. We propose that entropy fluctuations lead to a trivial P(q) at zero temperature as in the non-degenerate case, even if there are zero-energy large-scale excitations (complex energy landscape). Such a situation should arise in...
[ "cond-mat.stat-mech", "cond-mat.dis-nn" ]
null
[ "target.author.publication_history" ]
[]
[ { "author_id": "f krzakala_1", "name": "Florent Krzakala", "publication_history": null, "h_index": null, "num_papers": null, "num_citations": null }, { "author_id": "o martin_2", "name": "Olivier Martin", "publication_history": null, "h_index": null, "num_papers": nul...
null
8667251
math/0010015
2000-10-02
Gauge theory and calibrated geometry, I
The geometry of submanifolds is intimately related to the theory of functions and vector bundles. It has been of fundamental importance to find out how those two objects interact in many geometric and physical problems. A typical example of this relation is that the Picard group of line bundles on an algebraic manifold...
[ "math.DG" ]
null
[ "target.author.publication_history.key_reference" ]
null
null
null
18970167
astro-ph/0010057
2000-10-02
On the origin of the O and B-type stars with high velocities II Runaway stars and pulsars ejected from the nearby young stellar groups
We use milli-arcsecond accuracy astrometry (proper motions and parallaxes) from Hipparcos and from radio observations to retrace the orbits of 56 runaway stars and nine compact objects with distances less than 700 pc, to identify the parent stellar group. It is possible to deduce the specific formation scenario with ne...
[ "astro-ph" ]
null
[ "target.author.publication_history.key_reference" ]
null
null
null
16077677
hep-ph/0010018
2000-10-03
Production of Charginos, Neutralinos, and Third Generation Sfermions at an e+e- Linear Collider
We discuss the production of charginos, neutralinos, and third generation sfermions in $e^+e^-$ annihilation in the energy range $\sqrt{s} = 0.2-1$ TeV. We present numerical predictions within the Minimal Supersymmetric Standard Model for the cross sections and study the importance of beam polarization for the determin...
[ "hep-ph" ]
null
[ "target.author.publication_history" ]
[]
[ { "author_id": "a bartl_1", "name": "Alfred Bartl", "publication_history": null, "h_index": null, "num_papers": null, "num_citations": null }, { "author_id": "h eberl_1", "name": "Helmut Eberl", "publication_history": null, "h_index": null, "num_papers": null, "nu...
null
18519178
astro-ph/0010092
2000-10-04
Object Classification in Astronomical Multi-Color Surveys
We present a photometric method for identifying stars, galaxies and quasars in multi-color surveys, which uses a library of >65000 color templates. The method aims for extracting the information content of object colors in a statistically correct way and performs a classification as well as a redshift estimation for ga...
[ "astro-ph" ]
null
[ "target.author.publication_history.key_reference" ]
null
null
null
35506691
cond-mat/0010099
2000-10-05
Stability of Repulsive Bose-Einstein Condensates in a Periodic Potential
The cubic nonlinear Schr\"odinger equation with repulsive nonlinearity and an elliptic function potential models a quasi-one-dimensional repulsive dilute gas Bose-Einstein condensate trapped in a standing light wave. New families of stationary solutions are presented. Some of these solutions have neither an analog in t...
[ "cond-mat", "nlin.SI" ]
null
[ "target.author.publication_history", "target.author.publication_history.key_reference" ]
[]
[ { "author_id": "j bronski_1", "name": "Jared [\"C.\"] Bronski", "publication_history": null, "h_index": null, "num_papers": null, "num_citations": null }, { "author_id": "l carr_1", "name": "Lincoln [\"D.\"] Carr", "publication_history": null, "h_index": null, "num_pa...
null
15321471
astro-ph/0010113
2000-10-05
Planck LFI: Comparison Between Galaxy Straylight Contamination and other Systematic Effects
The straylight contamination due to the Galactic emission (GSC, Galaxy Straylight Contamination) entering at large angles from the antenna centre direction may be one of the most critical sources of systematic effects in observations of the cosmic microwave background (CMB) anisotropies by future satellite missions lik...
[ "astro-ph" ]
null
[ "target.author.publication_history" ]
[ { "corpus_id": "8809439", "num_citations": null } ]
[ { "author_id": "c burigana_1", "name": "Carlo Burigana", "publication_history": null, "h_index": null, "num_papers": null, "num_citations": null }, { "author_id": "d maino_1", "name": "Davide Maino", "publication_history": null, "h_index": null, "num_papers": null, ...
null
2963297
nlin/0010012
2000-10-05
Small world effect in an epidemiological model
A model for the spread of an infection is analyzed for different population structures. The interactions within the population are described by small world networks, ranging from ordered lattices to random graphs. For the more ordered systems, there is a fluctuating endemic state of low infection. At a finite value of ...
[ "nlin.AO", "cond-mat.other", "cond-mat.stat-mech", "q-bio.OT" ]
null
[ "target.author.publication_history.key_reference" ]
null
null
null
119345254
quant-ph/0010033
2000-10-07
Quantum computing via measurements only
A quantum computer promises efficient processing of certain computational tasks that are intractable with classical computer technology. While basic principles of a quantum computer have been demonstrated in the laboratory, scalability of these systems to a large number of qubits, essential for practical applications s...
[ "quant-ph" ]
null
[ "target.author.publication_history" ]
[]
[ { "author_id": "r raussendorf_1", "name": "Robert Raussendorf", "publication_history": null, "h_index": null, "num_papers": null, "num_citations": null }, { "author_id": "h briegel_1", "name": "Hans [\"J.\"] Briegel", "publication_history": null, "h_index": null, "num...
null
119439472
astro-ph/0010150
2000-10-07
The Optical Gravitational Lensing Experiment. BVI Maps of Dense Stellar Regions. II. The Large Magellanic Cloud
We present the BVI photometric maps of the Large Magellanic Cloud. They contain BVI photometry and astrometry of more than 7 million stars from the central parts of the LMC. The data were collected during the second phase of the OGLE microlensing project. We discuss the accuracy of the data and present color-magnitude ...
[ "astro-ph" ]
null
[ "target.author.publication_history.key_reference" ]
null
null
null
6135726
cs/0010012
2000-10-07
Finding consensus in speech recognition: word error minimization and other applications of confusion networks
We describe a new framework for distilling information from word lattices to improve the accuracy of speech recognition and obtain a more perspicuous representation of a set of alternative hypotheses. In the standard MAP decoding approach the recognizer outputs the string of words corresponding to the path with the hig...
[ "cs.CL" ]
null
[ "target.author.publication_history", "target.author.publication_history.key_reference", "target.key_reference" ]
[]
[ { "author_id": "l mangu_1", "name": "Lidia Mangu", "publication_history": null, "h_index": null, "num_papers": null, "num_citations": null }, { "author_id": "e brill_0", "name": "Eric Brill", "publication_history": null, "h_index": null, "num_papers": null, "num_c...
null
119378506
gr-qc/0010030
2000-10-09
Dissipative Fluid in Brans Dicke theory and late time acceleration
We have investigated the possibility of having a late time accelerated expansion phase for the universe. We have used a dissipative fluid in Brans-Dicke(BD) theory for this purpose. The model does not involve any potential for the BD scalar field. We have obtained the best fit values for the different parameters in our...
[ "gr-qc", "astro-ph" ]
null
[ "target.author.publication_history" ]
[]
[ { "author_id": "a sen_2", "name": "Anjan [\"A\"] Sen", "publication_history": null, "h_index": null, "num_papers": null, "num_citations": null }, { "author_id": "s sen_2", "name": "Sauvik Sen", "publication_history": null, "h_index": null, "num_papers": null, "num...
null
9237666
astro-ph/0010190
2000-10-10
Details of the mass--temperature relation for clusters of galaxies
We present results on the total mass and temperature determination using two samples of clusters of galaxies. One sample is constructed with emphasis on the completeness of the sample, while the advantage of the other is the use of the temperature profiles, derived with ASCA. We obtain remarkably similar fits to the M-...
[ "astro-ph" ]
null
[ "target.author.publication_history.key_reference" ]
null
null
null
6939747
astro-ph/0010176
2000-10-10
The Observed Offset Distribution of Gamma-Ray Bursts from Their Host Galaxies: A Robust Clue to the Nature of the Progenitors
We present a comprehensive study to measure the locations of gamma-ray bursts (GRBs) relative to their host galaxies. In total, we find the offsets of 20 long-duration GRBs from their apparent host galaxy centers utilizing ground-based images from Palomar and Keck and space-based images from the Hubble Space Telescope ...
[ "astro-ph" ]
null
[ "target.author.publication_history.key_reference" ]
null
null
null
19179815
astro-ph/0010202
2000-10-10
A search for L dwarf binary systems
We present analysis of HST Planetary Camera images of twenty L dwarfs identified in the course of the Two Micron All-Sky Survey. Four of the targets have faint, red companions at separations between 0.07 and 0.29 arcseconds (1.6 to 7.6 AU). In three cases, the bolometric magnitudes of the components differ by less than...
[ "astro-ph" ]
null
[ "target.author.publication_history.key_reference" ]
null
null
null
119330498
astro-ph/0010230
2000-10-11
Keck Hires Observations of the QSO First J104459.6+365605: Evidence for a Large Scale Outflow
This paper presents an analysis of a Keck HIRES spectrum of the QSO FIRST J104459.6+365605. The line of sight towards the QSO contains two clusters of outflowing clouds that give rise to broad blue shifted absorption lines. The outflow velocities of the clouds range from -200 to -1200 km/s and from -3400 to -5200 km/s,...
[ "astro-ph" ]
null
[ "target.author.publication_history.key_reference" ]
null
null
null
119056788
hep-th/0010088
2000-10-11
3-branes on resolved conifold
The type IIB supergravity solution describing a collection of regular and fractional D3 branes on the conifold (hep-th/0002159) was recently generalized to the case of the deformed conifold (hep-th/0007191). Here we present another generalization -- when the conifold is replaced by the resolved conifold. This solution ...
[ "hep-th" ]
null
[ "target.author.publication_history.key_reference" ]
null
null
null
47061960
cs/0010019
2000-10-11
The Random Oracle Methodology, Revisited
We take a critical look at the relationship between the security of cryptographic schemes in the Random Oracle Model, and the security of the schemes that result from implementing the random oracle by so called "cryptographic hash functions". The main result of this paper is a negative one: There exist signature and en...
[ "cs.CR" ]
null
[ "target.author.publication_history.key_reference" ]
null
null
null
731403
astro-ph/0010233
2000-10-12
Pulsar spectra of radio emission
We have collected pulsar flux density observations and compiled spectra of 281 objects. The database of Lorimer et al. (\cite{lorimer}) has been extended to frequencies higher than 1.4 GHz and lower than 300 MHz. Our results show that above 100 MHz the spectra of the majority of pulsars can be described by a simple pow...
[ "astro-ph" ]
null
[ "target.author.publication_history.key_reference" ]
null
null
null
121965096
hep-ex/0010026
2000-10-12
Differential cross section for W boson production as a function of transverse momentum in proton-antiproton collisions at 1.8 TeV
We report a measurement of the differential cross section for W boson production as a function of its transverse momentum in proton-antiproton collisions at sqrt{s} = 1.8 TeV. The data were collected by the D0 experiment at the Fermilab Tevatron Collider during 1994-1995 and correspond to an integrated luminosity of 85...
[ "hep-ex" ]
null
[ "target.author.publication_history" ]
[]
[ { "author_id": "v abazov_1", "name": "Victor [\"Mukhamedovich\"] Abazov", "publication_history": null, "h_index": null, "num_papers": null, "num_citations": null }, { "author_id": "b abbott_2", "name": "B. Abbott", "publication_history": null, "h_index": null, "num_pa...
null
16558258
astro-ph/0010236
2000-10-12
A deep submillimetre survey of the Galactic Centre
We present first results from a submillimetre continuum survey of the Galactic Centre `Central Molecular Zone' (CMZ), made with SCUBA on the James Clerk Maxwell Telescope. SCUBA's scan-map mode has allowed us to make extremely wide-field maps of thermal dust emission with unprecedented speed and sensitivity. We also di...
[ "astro-ph" ]
null
[ "target.author.publication_history.key_reference" ]
null
null
null
6777210
hep-th/0010108
2000-10-13
Remarks on Tachyon Condensation in Superstring Field Theory
We generalize recent results on tachyon condensation in boundary string field theory to the superstring.
[ "hep-th" ]
null
[ "target.author.publication_history.key_reference" ]
null
null
null
18187358
cond-mat/0010188
2000-10-13
Memory Effects and Heat Transport in One-dimensional Insulators
We study the dynamical correlation functions and heat conduction for the simplest model of quasi one-dimensional (1d) dielectric crystal i.e. a chain of classical particles coupled by quadratic and cubic intersite potential. Even in the weakly nonlinear regime, numerical simulation on long enough chains reveal sizeable...
[ "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 } ]
null
323853
cs/0010022
2000-10-15
Noise-Tolerant Learning, the Parity Problem, and the Statistical Query Model
We describe a slightly sub-exponential time algorithm for learning parity functions in the presence of random classification noise. This results in a polynomial-time algorithm for the case of parity functions that depend on only the first O(log n log log n) bits of input. This is the first known instance of an efficien...
[ "cs.LG", "cs.AI", "cs.DS" ]
null
[ "target.author.publication_history", "target.author.publication_history.key_reference", "target.key_reference" ]
[]
[ { "author_id": "a blum_1", "name": "Avrim Blum", "publication_history": null, "h_index": null, "num_papers": null, "num_citations": null }, { "author_id": "a kalai_1", "name": "Adam [\"Tauman\"] Kalai", "publication_history": null, "h_index": null, "num_papers": null,...
null
7636171
quant-ph/0010060
2000-10-17
Quantum Information Theory
In this thesis I present a short review of ideas in quantum information theory. The first chapter contains introductory material, sketching the central ideas of probability and information theory. Quantum mechanics is presented at the level of advanced undergraduate knowledge, together with some useful tools for quantu...
[ "quant-ph" ]
null
[ "target.author.publication_history.key_reference" ]
null
null
null
4540058
astro-ph/0010345
2000-10-17
Hydrodynamic Simulation of the Cosmological X-ray Background
(Abridged) We use a hydrodynamic simulation of a LambdaCDM model to predict the extragalactic X-ray background (XRB), focussing on emission from the intergalactic medium (IGM). We also include X-rays from point sources associated with galaxies in the simulation, and make maps of the angular distribution of the emission...
[ "astro-ph" ]
null
[ "target.author.publication_history.key_reference" ]
null
null
null
118328193
quant-ph/0010057
2000-10-17
Theory of quantum computation
Short review article on quantum computation accepted for Supplement III, Encyclopaedia of Mathematics (publication expected Summer 2001). See also http://www.wkap.nl/series.htm/ENM
[ "quant-ph" ]
null
[ "target.author.publication_history.key_reference" ]
null
null
null
15395145
hep-th/0010154
2000-10-18
Density of States and Tachyons in Open and Closed String Theory
In this note we reexamine the possibility of constructing stable non-supersymmetric theories that exhibit an exponential density of states. For weakly coupled closed strings there is a general theorem, according to which stable theories with an exponential density of states must exhibit an almost exact cancellation of ...
[ "hep-th" ]
null
[ "target.author.publication_history" ]
[]
[ { "author_id": "v niarchos_1", "name": "Vasilis Niarchos", "publication_history": null, "h_index": null, "num_papers": null, "num_citations": null } ]
null
2883238
astro-ph/0010364
2000-10-18
Gaussianity of Cosmic Velocity Fields and Linearity of the Velocity-Gravity Relation
We present a numerical study of the relation between the cosmic peculiar velocity field and the gravitational acceleration field. We show that on mildly non-linear scales (4-10 Mpc Gaussian smoothing), the distribution of the Cartesian coordinates of each of these fields is well approximated by a Gaussian. In particula...
[ "astro-ph" ]
null
[ "target.author.publication_history" ]
[ { "corpus_id": "18717129", "num_citations": null } ]
[ { "author_id": "p ciecielag_1", "name": "Pawel Ciecielag", "publication_history": null, "h_index": null, "num_papers": null, "num_citations": null }, { "author_id": "m chodorowski_1", "name": "Michał [\"J.\"] Chodorowski", "publication_history": null, "h_index": null, ...
null
14062789
astro-ph/0010352
2000-10-18
Power Spectra Estimation for Weak Lensing
We develop a method for estimating the shear power spectra from weak lensing observations and test it on simulated data. Our method describes the shear field in terms of angular power spectra and cross correlation of the two shear modes which differ under parity transformations. Two of the three power spectra can be us...
[ "astro-ph" ]
null
[ "target.author.publication_history.key_reference" ]
null
null
null
2132058
cond-mat/0309604
2000-10-19
Quantum phase transitions
In recent years, quantum phase transitions have attracted the interest of both theorists and experimentalists in condensed matter physics. These transitions, which are accessed at zero temperature by variation of a non-thermal control parameter, can influence the behavior of electronic systems over a wide range of the ...
[ "cond-mat.stat-mech" ]
null
[ "target.author.publication_history.key_reference" ]
null
null
null
16298768
cond-mat/0010317
2000-10-20
Epidemic spreading in scale-free networks
The Internet, as well as many other networks, has a very complex connectivity recently modeled by the class of scale-free networks. This feature, which appears to be very efficient for a communications network, favors at the same time the spreading of computer viruses. We analyze real data from computer virus infection...
[ "cond-mat.stat-mech" ]
null
[ "target.author.publication_history.key_reference" ]
null
null
null
119034614
astro-ph/0010434
2000-10-21
UVES observations of QSO 0000-2620: Argon and Phosphorus abundances in the dust-free damped Ly-alpha system at zabs = 3.3901
The UV resonance transitions of neutral argon ArI 1066 A, and of singly ionized phosphorus PII 963 A, originated in the damped Ly_alpha system (DLA) at zabs = 3.3901 towards QSO 0000--2620 have been detected by means of the UVES spectrograph at the 8.2m ESO KUEYEN telescope. So far, this is the first measurement of ArI...
[ "astro-ph" ]
null
[ "target.author.publication_history.key_reference" ]
null
null
null
119721687
math/0010244
2000-10-25
Approximation of dual Gabor frames, window decay, and wireless communications
We consider three problems for Gabor frames that have recently received much attention. The first problem concerns the approximation of dual Gabor frames in $L_2(R)$ by finite-dimensional methods. Utilizing Wexler-Raz type duality relations we derive a method to approximate the dual Gabor frame, that is much simpler th...
[ "math.FA", "cs.NA", "math.NA" ]
null
[ "target.author.publication_history", "target.author.publication_history.key_reference" ]
[ { "corpus_id": "14242122", "num_citations": null } ]
[ { "author_id": "t strohmer_1", "name": "Thomas Strohmer", "publication_history": null, "h_index": null, "num_papers": null, "num_citations": null } ]
null
14401761
hep-ex/0010062
2000-10-25
Searches for neutral Higgs bosons in e+e- collisions at centre-of-mass energies from 192 to 202GeV
Searches for neutral Higgs bosons are performed with the 237 pb-1 of data collected in 1999 by the ALEPH detector at LEP, for centre-of-mass energies between 191.6 and 201.6 GeV. These searches apply to Higgs bosons within the context of the Standard Model and its minimal supersymmetric extension (MSSM) as well as to i...
[ "hep-ex" ]
null
[ "target.author.publication_history" ]
[]
[ { "author_id": "r barate_2", "name": "Renaud Barate", "publication_history": null, "h_index": null, "num_papers": null, "num_citations": null }, { "author_id": "d decamp_1", "name": "D. Decamp", "publication_history": null, "h_index": null, "num_papers": null, "nu...
null
18943509
math/0010242
2000-10-25
Numerical Analysis of the Non-uniform Sampling Problem
We give an overview of recent developments in the problem of reconstructing a band-limited signal from non-uniform sampling from a numerical analysis view point. It is shown that the appropriate design of the finite-dimensional model plays a key role in the numerical solution of the non-uniform sampling problem. In the...
[ "math.NA" ]
null
[ "target.author.publication_history", "target.author.publication_history.key_reference" ]
[]
[ { "author_id": "t strohmer_1", "name": "Thomas Strohmer", "publication_history": null, "h_index": null, "num_papers": null, "num_citations": null } ]
null
7241906
math/0010245
2000-10-25
Characterization and computation of canonical tight windows for Gabor frames
Let $(g_{nm})_{n,m\in Z}$ be a Gabor frame for $L_2(R)$ for given window $g$. We show that the window $h^0=S^{-1/2} g$ that generates the canonically associated tight Gabor frame minimizes $\|g-h\|$ among all windows $h$ generating a normalized tight Gabor frame. We present and prove versions of this result in the time...
[ "math.FA", "math.NA" ]
null
[ "target.author.publication_history" ]
[ { "corpus_id": "14242122", "num_citations": null } ]
[ { "author_id": "a janssen_1", "name": "Augustus [\"J.\",\"E.\",\"M.\"] Janssen", "publication_history": null, "h_index": null, "num_papers": null, "num_citations": null }, { "author_id": "t strohmer_1", "name": "Thomas Strohmer", "publication_history": null, "h_index": nu...
null
116036610
math/0010231
2000-10-25
Hamiltonian stationary Lagrangian surfaces in Hermitian symmetric spaces
This paper is the third of a series on Hamiltonian stationary Lagrangian surfaces. We present here the most general theory, valid for any Hermitian symmetric target space. Using well-chosen moving frame formalism, we show that the equations are equivalent to an integrable system, generalizing the C^2 subcase analyzed i...
[ "math.DG" ]
null
[ "target.author.publication_history.key_reference" ]
null
null
null
6396681
quant-ph/0010085
2000-10-25
Entangled quantum states as direction indicators
We consider the use of N spin-1/2 particles for indicating a direction in space. If N>2, their optimal state is entangled. For large N, the mean square error decreases as N^{-2} (rather than N^{-1} for parallel spins).
[ "quant-ph" ]
null
[ "target.author.publication_history.key_reference" ]
null
null
null