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15236359
astro-ph/0304048
2003-04-02
The Birmingham-CfA cluster scaling project - III: entropy and similarity in galaxy systems
We examine profiles and scaling properties of the entropy of the intergalactic gas in a sample of 66 virialized systems, ranging in mass from single elliptical galaxies to rich clusters, for which we have resolved X-ray temperature profiles. Some of the properties we derive appear to be inconsistent with any of the mod...
[ "astro-ph" ]
null
[ "target.author.publication_history.key_reference" ]
null
null
null
14843323
astro-ph/0304060
2003-04-02
Scattering by Interstellar Dust Grains: Optical and Ultraviolet
Scattering and absorption properties at optical and ultraviolet wavelengths are calculated for an interstellar dust model consisting of carbonaceous grains and amorphous silicate grains. Polarization as a function of scattering angle is calculated for selected wavelengths from the IR to the vacuum UV. The widely-used H...
[ "astro-ph" ]
null
[ "target.author.publication_history.key_reference" ]
null
null
null
17850284
astro-ph/0304056
2003-04-02
The Subdwarf Luminosity Function
Using data from the Sloan Digital Sky Survey Early Data Release and SuperCOSMOS Sky Survey scans of POSS-I plates we identify a sample of 2600 subdwarfs using reduced proper motion methods and strict selection criteria. This forms one of the largest and most reliable samples of candidate subdwarfs known, and enables us...
[ "astro-ph" ]
null
[ "target.author.publication_history.key_reference" ]
null
null
null
119469189
hep-ph/0304035
2003-04-03
Higgs boson production in bottom quark fusion at next-to-next-to-leading order
The total cross section for Higgs production in bottom-quark annihilation is evaluated at next-to-next-to-leading order (NNLO) in QCD. This is the first time that all terms at order alpha_s^2 are taken into account. We find a greatly reduced scale dependence with respect to lower order results, for both the factorizati...
[ "hep-ph" ]
null
[ "target.author.publication_history.key_reference" ]
null
null
null
5437450
astro-ph/0304072
2003-04-03
The evolution of faint AGN between z~1 and z~5 from the COMBO-17 survey
We present a determination of the optical/UV AGN luminosity function and its evolution, based on a large sample of faint (R<24) QSOs identified in the COMBO-17 survey. Using multi-band photometry in 17 filters within 350nm < lambda_obs < 930nm, we could simultaneously determine photometric redshifts with an accuracy of...
[ "astro-ph" ]
null
[ "target.author.publication_history.key_reference" ]
null
null
null
18448461
astro-ph/0304087
2003-04-04
Multi-frequency polarimetry of the Galactic radio background around 350 MHz: II. A region in Horologium around l = 137, b = 7
We study a conspicuous ring-like structure with a radius of about 1.4 degrees which was observed with the Westerbork Synthesis Radio Telescope (WSRT) at 5 frequencies around 350 MHz. This ring is very prominent in Stokes Q and U, and less so in polarized intensity P. No corresponding structure is visible in total inten...
[ "astro-ph" ]
null
[ "target.author.publication_history.key_reference" ]
null
null
null
118390654
cond-mat/0304098
2003-04-04
Quantum 2D Heisenberg antiferromagnet: bridging the gap between field-theoretical and semiclassical approaches
The field-theoretical result for the low-$T$ behaviour of the correlation length of the quantum Heisenberg antiferromagnet on the square lattice was recently improved by Hasenfratz [Eur. Phys. J. B {\bf 13}, 11 (2000)], who corrected for cutoff effects. We show that starting from his expression, and exploiting our know...
[ "cond-mat.stat-mech", "cond-mat.str-el" ]
null
[ "target.author.publication_history" ]
[]
[ { "author_id": "b beard_1", "name": "Bernard [\"B.\"] Beard", "publication_history": null, "h_index": null, "num_papers": null, "num_citations": null }, { "author_id": "a cuccoli_1", "name": "Alessandro Cuccoli", "publication_history": null, "h_index": null, "num_pape...
null
94041331
cond-mat/0304107
2003-04-04
The Pd(100)-(SQRT(5) x SQRT(5) R27^o)-O surface oxide revisited
Combining high-resolution core-level spectroscopy (HRCLS), scanning tunneling microscopy (STM) and density-functional theory (DFT) calculations we reanalyze the Pd(100)-(SQRT(5) x SQRT(5) R27^o)-O surface oxide phase. We find that the prevalent structural model, a rumpled PdO(001) film suggested by previous low energy ...
[ "cond-mat.mtrl-sci" ]
null
[ "target.author.publication_history" ]
[]
[ { "author_id": "m todorova_1", "name": "Mira Todorova", "publication_history": null, "h_index": null, "num_papers": null, "num_citations": null }, { "author_id": "e lundgren_1", "name": "Edvin Lundgren", "publication_history": null, "h_index": null, "num_papers": null...
null
45162703
nucl-th/0304018
2003-04-05
Accurate Charge-Dependent Nucleon-Nucleon Potential at Fourth Order of Chiral Perturbation Theory
We present the first nucleon-nucleon potential at next-to-next-to-next-to-leading order (fourth order) of chiral perturbation theory. Charge-dependence is included up to next-to-leading order of the isospin-violation scheme. The accuracy for the reproduction of the NN data below 290 MeV lab. energy is comparable to the...
[ "nucl-th", "nucl-ex" ]
null
[ "target.author.publication_history.key_reference" ]
null
null
null
119087308
hep-th/0304049
2003-04-06
Nonlinear Equations for Symmetric Massless Higher Spin Fields in $(A)dS_d$
Nonlinear field equations for totally symmetric bosonic massless fields of all spins in any dimension are presented.
[ "hep-th" ]
null
[ "target.author.publication_history.key_reference" ]
null
null
null
8282859
math/0304094
2003-04-07
Uniform 1-Cochains and Genuine Laminations
We construct a pair of transverse genuine laminations on an atoroidal 3-manifold admitting transversely orientable uniform 1-cochain. The laminations are induced by the uniform 1-cochain and they are indeed the "straightening" of the coarse laminations defined in [Ca], by using minimal surface techniques. Moreover, whe...
[ "math.GT" ]
null
[ "target.author.publication_history", "target.author.publication_history.key_reference" ]
[]
[ { "author_id": "b coskunuzer_1", "name": "Baris Coskunuzer", "publication_history": null, "h_index": null, "num_papers": null, "num_citations": null } ]
null
16385289
hep-th/0304045
2003-04-07
Tachyon Effective Actions In Open String Theory
We argue that the Dirac-Born-Infeld (DBI) action coupled to a tachyon, that is known to reproduce some aspects of open string dynamics, can be obtained from open string theory in a certain limit, which generalizes the limit leading to the usual DBI action. This helps clarify which aspects of the full open string theory...
[ "hep-th" ]
null
[ "target.author.publication_history", "target.author.publication_history.key_reference" ]
[ { "corpus_id": "6777210", "num_citations": null }, { "corpus_id": "14486826", "num_citations": null }, { "corpus_id": "16103842", "num_citations": null }, { "corpus_id": "6855505", "num_citations": null }, { "corpus_id": "14592887", "num_citations": null }, ...
[ { "author_id": "d kutasov_0", "name": "David Kutasov", "publication_history": null, "h_index": null, "num_papers": null, "num_citations": null }, { "author_id": "v niarchos_1", "name": "Vasilis Niarchos", "publication_history": null, "h_index": null, "num_papers": nul...
null
10000057
quant-ph/0304052
2003-04-07
Quantum Search on Bounded-Error Inputs
Suppose we have n algorithms, quantum or classical, each computing some bit-value with bounded error probability. We describe a quantum algorithm that uses O(sqrt{n}) repetitions of the base algorithms and with high probability finds the index of a 1-bit among these n bits (if there is such an index). This shows that i...
[ "quant-ph", "cs.CC" ]
null
[ "target.author.publication_history.key_reference" ]
null
null
null
17436983
math/0304104
2003-04-08
The Lax conjecture is true
In 1958 Lax conjectured that hyperbolic polynomials in three variables are determinants of linear combinations of three symmetric matrices. This conjecture is equivalent to a recent observation of Helton and Vinnikov.
[ "math.OC" ]
null
[ "target.author.publication_history", "target.author.publication_history.key_reference" ]
[]
[ { "author_id": "a lewis_7", "name": "Adrian [\"S.\"] Lewis", "publication_history": null, "h_index": null, "num_papers": null, "num_citations": null }, { "author_id": "p parrilo_1", "name": "Pablo [\"A.\"] Parrilo", "publication_history": null, "h_index": null, "num_p...
null
119517166
astro-ph/0304151
2003-04-08
3D weak lensing
I propose an analysis method, based on spin-spherical harmonics and spherical Bessel functions, for large-scale weak lensing surveys which have source distance information through photometric redshifts. I show that the distance information can significantly reduce statistical errors on cosmological parameters; in parti...
[ "astro-ph" ]
null
[ "target.author.publication_history.key_reference" ]
null
null
null
54744993
quant-ph/0304054
2003-04-08
Quantum computation based on d-level cluster states
The concept of qudit (a d-level system) cluster state is proposed by generalizing the qubit cluster state (Phys. Rev. Lett. \textbf{86}, 910 (2001)) according to the finite dimensional representations of quantum plane algebra. We demonstrate their quantum correlations and prove a theorem which guarantees the availabili...
[ "quant-ph" ]
null
[ "target.author.publication_history.key_reference" ]
null
null
null
11502446
math/0304119
2003-04-08
The Brownian Web: Characterization and Convergence
The Brownian Web (BW) is the random network formally consisting of the paths of coalescing one-dimensional Brownian motions starting from every space-time point in ${\mathbb R}\times{\mathbb R}$. We extend the earlier work of Arratia and of T\'oth and Werner by providing characterization and convergence results for the...
[ "math.PR" ]
null
[ "target.author.publication_history.key_reference" ]
null
null
null
14629589
astro-ph/0304156
2003-04-09
Self-Regulated Growth of Supermassive Black Holes in Galaxies as the Origin of the Optical and X-ray Luminosity Functions of Quasars
We postulate that supermassive black-holes grow in the centers of galaxies until they unbind the galactic gas that feeds them. We show that the corresponding self-regulation condition yields a correlation between black-hole mass (Mbh) and galaxy velocity dispersion (sigma) as inferred in the local universe, and recover...
[ "astro-ph" ]
null
[ "target.author.publication_history.key_reference" ]
null
null
null
11895472
astro-ph/0304174
2003-04-09
The First Substellar Subdwarf? Discovery of a Metal-poor L Dwarf with Halo Kinematics
We present the discovery of the first L-type subdwarf, 2MASS J05325346+8246465. This object exhibits enhanced collision-induced H$_2$ absorption, resulting in blue NIR colors ($J-K_s = 0.26{\pm}0.16$). In addition, strong hydride bands in the red optical and NIR, weak TiO absorption, and an optical/J-band spectral morp...
[ "astro-ph" ]
null
[ "target.author.publication_history", "target.author.publication_history.key_reference" ]
[ { "corpus_id": "9273465", "num_citations": null }, { "corpus_id": "17709518", "num_citations": null }, { "corpus_id": "16863021", "num_citations": null }, { "corpus_id": "15764829", "num_citations": null }, { "corpus_id": "17803457", "num_citations": null },...
[ { "author_id": "a burgasser_1", "name": "Adam [\"J.\"] Burgasser", "publication_history": null, "h_index": null, "num_papers": null, "num_citations": null }, { "author_id": "j kirkpatrick_2", "name": "J. [\"Davy\"] Kirkpatrick", "publication_history": null, "h_index": nul...
null
1466364
astro-ph/0304177
2003-04-09
Tracing the large scale structure in the Chandra Deep Field South
We report the discovery of large scale structures of X-ray sources in the 1Msec observation of the Chandra Deep Field South. Two main structures appear as narrow (Delta_z < 0.02) spikes in the source redshift distribution at z=0.67 and z=0.73, respectively. Their angular distribution spans a region at least ~ 17 arcmin...
[ "astro-ph" ]
null
[ "target.author.publication_history", "target.author.publication_history.key_reference" ]
[ { "corpus_id": "118778799", "num_citations": null }, { "corpus_id": "9533175", "num_citations": null }, { "corpus_id": "8533459", "num_citations": null } ]
[ { "author_id": "r gilli_1", "name": "Roberto Gilli", "publication_history": null, "h_index": null, "num_papers": null, "num_citations": null }, { "author_id": "r gilli_1", "name": "Roberto Gilli", "publication_history": null, "h_index": null, "num_papers": null, "...
null
119336517
nucl-ex/0304012
2003-04-10
Dynamical effects in multifragmentation at intermediate energies
The fragmentation of the quasi-projectile is studied with the INDRA multidetector for different colliding systems and incident energies in the Fermi energy range. Different experimental observations show that a large part of the fragmentation is not compatible with the statistical fragmentation of a fully equilibrated ...
[ "nucl-ex" ]
null
[ "target.author.publication_history" ]
[]
[ { "author_id": "j colin_2", "name": "Jeanett [\"Mendoza\"] Colin", "publication_history": null, "h_index": null, "num_papers": null, "num_citations": null }, { "author_id": "d cussol_1", "name": "Daniel Cussol", "publication_history": null, "h_index": null, "num_paper...
null
6716164
math/0304143
2003-04-10
New coins from old: computing with unknown bias
Suppose that we are given a function f : (0,1) -> (0,1) and, for some unknown p in (0,1), a sequence of independent tosses of a p-coin (i.e., a coin with probability p of ``heads''). For which functions f is it possible to simulate an f(p)-coin?; This question was raised by S. Asmussen and J. Propp. A simple simulation...
[ "math.PR", "math.CO" ]
null
[ "target.author.publication_history" ]
[]
[ { "author_id": "e mossel_1", "name": "Elchanan Mossel", "publication_history": null, "h_index": null, "num_papers": null, "num_citations": null }, { "author_id": "y peres_1", "name": "Yuval Peres", "publication_history": null, "h_index": null, "num_papers": null, ...
null
2387702
astro-ph/0304198
2003-04-10
A 2MASS All-Sky View of the Sagittarius Dwarf Galaxy: I. Morphology of the Sagittarius Core and Tidal Arms
We present the first all-sky view of the Sagittarius (Sgr) dwarf galaxy mapped by M giant star tracers detected in the complete Two Micron All-Sky Survey (2MASS). The main body is fit with a King profile of 30 deg limiting radius, but with a break in the density profile from stars in tidal tails. We argue that much of ...
[ "astro-ph" ]
null
[ "target.author.publication_history.key_reference" ]
null
null
null
16269395
math/0304134
2003-04-10
Ergodicity of Stochastic Differential Equations Driven by Fractional Brownian Motion
We study the ergodic properties of finite-dimensional systems of SDEs driven by non-degenerate additive fractional Brownian motion with arbitrary Hurst parameter $H\in(0,1)$. A general framework is constructed to make precise the notions of ``invariant measure'' and ``stationary state'' for such a system. We then prove...
[ "math.PR" ]
null
[ "target.author.publication_history.key_reference" ]
null
null
null
2561943
astro-ph/0304173
2003-04-10
Spectroscopic Discovery of the Supernova 2003dh Associated with GRB 030329
We present early observations of the afterglow of the Gamma-Ray Burst (GRB) 030329 and the spectroscopic discovery of its associated supernova SN 2003dh. We obtained spectra of the afterglow of GRB 030329 each night from March 30.12 (0.6 days after the burst) to April 8.13 (UT) (9.6 days after the burst). The spectra c...
[ "astro-ph" ]
null
[ "target.author.publication_history.key_reference" ]
null
null
null
11280160
cs/0304017
2003-04-10
Ground Canonicity
We explore how different proof orderings induce different notions of saturation. We relate completion, paramodulation, saturation, redundancy elimination, and rewrite system reduction to proof orderings.
[ "cs.LO" ]
null
[ "target.author.publication_history" ]
[]
[ { "author_id": "n dershowitz_1", "name": "Nachum Dershowitz", "publication_history": null, "h_index": null, "num_papers": null, "num_citations": null } ]
null
14739362
astro-ph/0304214
2003-04-11
Reconstruction of the early Universe as a convex optimization problem
We show that the deterministic past history of the Universe can be uniquely reconstructed from the knowledge of the present mass density field, the latter being inferred from the 3D distribution of luminous matter, assumed to be tracing the distribution of dark matter up to a known bias. Reconstruction ceases to be uni...
[ "astro-ph", "cond-mat", "math-ph", "math.MP", "math.OC", "nlin.PS" ]
null
[ "target.author.publication_history.key_reference" ]
null
null
null
13878501
hep-th/0304115
2003-04-11
Residues and World-Sheet Instantons
We reconsider the question of which Calabi-Yau compactifications of the heterotic string are stable under world-sheet instanton corrections to the effective space-time superpotential. For instance, compactifications described by (0,2) linear sigma models are believed to be stable, suggesting a remarkable cancellation a...
[ "hep-th" ]
null
[ "target.author.publication_history.key_reference" ]
null
null
null
15013063
hep-ex/0304018
2003-04-11
CNGS beam monitor with the LVD detector
The importance of an adequate CNGS beam monitor at the Gran Sasso Laboratory has been stressed in many papers. Since the number of internal $\nu_\mu$ CC and NC interactions in the various detectors will not allow to collect statistics rapidly, one should also be able to detect the $\nu_\mu$ CC interactions in the upstr...
[ "hep-ex" ]
null
[ "target.author.publication_history" ]
[]
[ { "author_id": "m aglietta_1", "name": "Massimo Aglietta", "publication_history": null, "h_index": null, "num_papers": null, "num_citations": null }, { "author_id": "p antonioli_1", "name": "Pietro Antonioli", "publication_history": null, "h_index": null, "num_papers"...
null
687265
cs/0304020
2003-04-11
A direct sum theorem in communication complexity via message compression
We prove lower bounds for the direct sum problem for two-party bounded error randomised multiple-round communication protocols. Our proofs use the notion of information cost of a protocol, as defined by Chakrabarti, Shi, Wirth and Yao and refined further by Bar-Yossef, Jayram, Kumar and Sivakumar. Our main technical re...
[ "cs.CC" ]
null
[ "target.author.publication_history.key_reference" ]
null
null
null
484465
math/0304162
2003-04-13
Multihomogeneous resultant formulae by means of complexes
We provide conditions and algorithmic tools so as to classify and construct the smallest possible determinantal formulae for multihomogeneous resultants arising from Weyman complexes associated to line bundles in products of projective spaces. We also examine the smallest Sylvester-type matrices, generically of full ra...
[ "math.AG", "math.AC" ]
null
[ "target.author.publication_history", "target.author.publication_history.key_reference" ]
[ { "corpus_id": "102344708", "num_citations": null } ]
[ { "author_id": "a dickenstein_1", "name": "Alicia Dickenstein", "publication_history": null, "h_index": null, "num_papers": null, "num_citations": null }, { "author_id": "i emiris_1", "name": "Ioannis [\"Z.\"] Emiris", "publication_history": null, "h_index": null, "nu...
null
119438379
cond-mat/0304312
2003-04-14
Switching a spin-valve back and forth by current-induced domain wall motion
We have studied the current-induced displacement of a domain wall (DW) in the permalloy (Py) layer of a Co/Cu/Py spin valve structure at zero and very small applied field. The displacement is in opposite direction for opposite dc currents, and the current density required to move DW is only of the order of 10^6 A/cm^2....
[ "cond-mat.mtrl-sci" ]
null
[ "target.author.publication_history" ]
[]
[ { "author_id": "j grollier_1", "name": "Julie Grollier", "publication_history": null, "h_index": null, "num_papers": null, "num_citations": null }, { "author_id": "p boulenc_0", "name": "P. Boulenc", "publication_history": null, "h_index": null, "num_papers": null, ...
null
6249056
astro-ph/0304256
2003-04-14
Relativistic and slowing down: the flow in the hotspots of powerful radio galaxies and quasars
Pairs of radio emitting jets with lengths up to several hundred kiloparsecs emanate from the central region (the `core') of radio loud active galaxies. In the most powerful of them, these jets terminate in the `hotspots', compact high brightness regions, where the jet flow collides with the intergalactic medium (IGM). ...
[ "astro-ph" ]
null
[ "target.author.publication_history.key_reference" ]
null
null
null
119385581
astro-ph/0304239
2003-04-14
The Host Galaxies of AGN
We examine the properties of the host galaxies of 22,623 narrow-line AGN with 0.02<z<0.3 selected from a complete sample of 122,808 galaxies from the Sloan Digital Sky Survey. We focus on the luminosity of the [OIII]$\lambda$5007 emission line as a tracer of the strength of activity in the nucleus. We study how AGN hos...
[ "astro-ph" ]
null
[ "target.author.publication_history.key_reference" ]
null
null
null
37014454
nlin/0304029
2003-04-15
Travelling waves in pipe flow
A family of three-dimensional travelling waves for flow through a pipe of circular cross section is identified. The travelling waves are dominated by pairs of downstream vortices and streaks. They originate in saddle-node bifurcations at Reynolds numbers as low as 1250. All states are immediately unstable. Their dynami...
[ "nlin.CD", "physics.flu-dyn" ]
null
[ "target.author.publication_history.key_reference" ]
null
null
null
44789558
cond-mat/0304337
2003-04-15
Memory effects in microscopic traffic models and wide scattering in flow-density data
By means of microscopic simulations we show that non-instantaneous adaptation of the driving behaviour to the traffic situation together with the conventional measurement method of flow-density data can explain the observed inverse-$\lambda$ shape and the wide scattering of flow-density data in ``synchronized'' congest...
[ "cond-mat.stat-mech", "cond-mat.soft" ]
null
[ "target.author.publication_history.key_reference" ]
null
null
null
3175302
hep-th/0304128
2003-04-15
The Exact Superconformal R-Symmetry Maximizes a
An exact and general solution is presented for a previously open problem. We show that the superconformal R-symmetry of any 4d SCFT is exactly and uniquely determined by a maximization principle: it is the R-symmetry, among all possibilities, which (locally) maximizes the combination of 't Hooft anomalies a_{trial}(R) ...
[ "hep-th" ]
null
[ "target.author.publication_history.key_reference" ]
null
null
null
16336360
math/0304218
2003-04-16
The Tropical Grassmannian
In tropical algebraic geometry, the solution sets of polynomial equations are piecewise-linear. We introduce the tropical variety of a polynomial ideal, and we identify it with a polyhedral subcomplex of the Grobner fan. The tropical Grassmannian arises in this manner from the ideal of quadratic Plucker relations. It i...
[ "math.AG", "math.CO" ]
null
[ "target.author.publication_history.key_reference" ]
null
null
null
7643788
math/0304229
2003-04-16
Some new aspects of the coupon-collector's problem
We extend the classical coupon collector's problem to one in which two collectors are simultaneously and independently seeking collections of $d$ coupons. We find, in finite terms, the probability that the two collectors finish at the same trial, and we find, using the methods of Gessel-Viennot, the probability that th...
[ "math.CO" ]
null
[ "target.author.publication_history.key_reference" ]
null
null
null
14352535
astro-ph/0304335
2003-04-17
VLBI Imaging of Luminous Infrared Galaxies: AGN Cores in Mrk231, UGC 5101 & NGC 7469
We report 18cm VLBI continuum imaging observations at 5 mas resolution for UGC 5101, NGC 7469, and Mrk 231, all part of a sample of Luminous Infrared Galaxies which have been shown to have strong VLBI radio cores. The radio morphology of these three systems on VLBI scales is AGN-like, with well-defined ridgelines and h...
[ "astro-ph" ]
null
[ "target.author.publication_history.key_reference" ]
null
null
null
116620229
gr-qc/0304062
2003-04-17
Dynamical control of the constraints growth in free evolutions of Einstein's equations
I present a new, simple method to dynamically control the growth of the discretized constraints during a free evolution of Einstein's equations. During an evolution, any given family of formulations is adjusted off the constraints surface in a way such that, for any chosen numerical method and arbitrary but fixed resol...
[ "gr-qc" ]
null
[ "target.author.publication_history" ]
[]
[ { "author_id": "m tiglio_1", "name": "Manuel Tiglio", "publication_history": null, "h_index": null, "num_papers": null, "num_citations": null } ]
null
1374801
astro-ph/0304350
2003-04-18
Spectral Irradiance Calibration in the Infrared. XIV: the Absolute Calibration of 2MASS
Element-by-element we have combined the optical components in the three 2MASS cameras, and incorporated detector quantum efficiency curves and site-specific atmospheric transmissions, to create three relative spectral response curves (RSRs). We provide absolute 2MASS attributes associated with "zero magnitude" in the J...
[ "astro-ph" ]
null
[ "target.author.publication_history.key_reference" ]
null
null
null
119449569
quant-ph/0304125
2003-04-18
The Clifford group, stabilizer states, and linear and quadratic operations over GF(2)
We describe stabilizer states and Clifford group operations using linear operations and quadratic forms over binary vector spaces. We show how the n-qubit Clifford group is isomorphic to a group with an operation that is defined in terms of a (2n+1)x(2n+1) binary matrix product and binary quadratic forms. As an applica...
[ "quant-ph" ]
null
[ "target.author.publication_history.key_reference" ]
null
null
null
23759541
cond-mat/0304438
2003-04-18
Detection of XY behaviour in weakly anisotropic quantum antiferromagnets on the square lattice
We consider the Heisenberg antiferromagnet on the square lattice with S=1/2 and very weak easy-plane exchange anisotropy; by means of the quantum Monte Carlo method, based on the continuous-time loop algorithm, we find that the thermodynamics of the model is highly sensitive to the presence of tiny anisotropies and is ...
[ "cond-mat.stat-mech", "cond-mat.str-el" ]
null
[ "target.author.publication_history" ]
[]
[ { "author_id": "a cuccoli_1", "name": "Alessandro Cuccoli", "publication_history": null, "h_index": null, "num_papers": null, "num_citations": null }, { "author_id": "t roscilde_1", "name": "Tommaso Roscilde", "publication_history": null, "h_index": null, "num_papers"...
null
12246393
quant-ph/0304127
2003-04-18
The private classical capacity and quantum capacity of a quantum channel
A formula for the capacity of a quantum channel for transmitting private classical information is derived. This is shown to be equal to the capacity of the channel for generating a secret key, and neither capacity is enhanced by forward public classical communication. Motivated by the work of Schumacher and Westmorelan...
[ "quant-ph" ]
null
[ "target.author.publication_history.key_reference" ]
null
null
null
16752279
cs/0304026
2003-04-19
A New Multilayered PCP and the Hardness of Hypergraph Vertex Cover
Given a $k$-uniform hyper-graph, the E$k$-Vertex-Cover problem is to find the smallest subset of vertices that intersects every hyper-edge. We present a new multilayered PCP construction that extends the Raz verifier. This enables us to prove that E$k$-Vertex-Cover is NP-hard to approximate within factor $(k-1-\epsilon...
[ "cs.CC" ]
null
[ "target.author.publication_history", "target.author.publication_history.key_reference" ]
[]
[ { "author_id": "i dinur_1", "name": "Irit Dinur", "publication_history": null, "h_index": null, "num_papers": null, "num_citations": null }, { "author_id": "v guruswami_1", "name": "Venkatesan Guruswami", "publication_history": null, "h_index": null, "num_papers": nul...
null
16983364
math/0304291
2003-04-21
Discrete convexity and unimodularity. I
In this paper we develop a theory of convexity for a free Abelian group M (the lattice of integer points), which we call theory of discrete convexity. We characterize those subsets X of the group M that could be call "convex". One property seems indisputable: X should coincide with the set of all integer points of its ...
[ "math.CO" ]
null
[ "target.author.publication_history.key_reference" ]
null
null
null
4676258
astro-ph/0304382
2003-04-22
Galactic Stellar and Substellar Initial Mass Function
We review recent determinations of the present day and initial mass functions in various components of the Galaxy, disk, spheroid, young and globular clusters. As a general feature, the IMF is well described by a power-law form for $m\ga 1 \msol$ and a lognormal form below. The extension of the disk IMF into the brown ...
[ "astro-ph" ]
null
[ "target.author.publication_history.key_reference" ]
null
null
null
14673472
astro-ph/0304375
2003-04-22
Properties of cluster satellites in hydrodynamical simulations
We analyze the dynamical and thermal evolution of dark matter and ICM in hydrodynamical Tree-SPH simulations of galaxy clusters. Starting from a sample of 17 high-resolution objects, with virial mass ranging from 3 10^{14} to 1.7 10^{15} M_sun, we follow the build-up of the systems in dark matter and hot gas through th...
[ "astro-ph" ]
null
[ "target.author.publication_history" ]
[ { "corpus_id": "14217110", "num_citations": null } ]
[ { "author_id": "g tormen_1", "name": "Giuseppe Tormen", "publication_history": null, "h_index": null, "num_papers": null, "num_citations": null }, { "author_id": "l moscardini_2", "name": "Lauro Moscardini", "publication_history": null, "h_index": null, "num_papers": ...
null
118967359
hep-ph/0304226
2003-04-23
m_T2 : the truth behind the glamour
We present the kinematic variable, m_T2, which is in some ways similar to the more familiar `transverse-mass', but which can be used in events where two or more particles have escaped detection. We define this variable and describe the event topologies to which it applies, then present some of its mathematical properti...
[ "hep-ph" ]
null
[ "target.author.publication_history.key_reference" ]
null
null
null
13930159
math-ph/0304032
2003-04-23
Infinite Products of Large Random Matrices and Matrix-valued Diffusion
We use an extension of the diagrammatic rules in random matrix theory to evaluate spectral properties of finite and infinite products of large complex matrices and large hermitian matrices. The infinite product case allows us to define a natural matrix-valued multiplicative diffusion process. In both cases of hermitian...
[ "math-ph", "cond-mat", "hep-th", "math.MP", "nlin.CD" ]
null
[ "target.author.publication_history.key_reference" ]
null
null
null
13963821
physics/0304090
2003-04-24
Induced-Charge Electro-Osmosis
We describe the general phenomenon of `induced-charge electro-osmosis' (ICEO) -- the nonlinear electro-osmotic slip that occurs when an applied field acts on the ionic charge it {\sl induces} around a polarizable surface. Motivated by a simple physical picture, we calculate ICEO flows around conducting cylinders in ste...
[ "physics.flu-dyn", "cond-mat.soft", "physics.chem-ph" ]
null
[ "target.author.publication_history" ]
[]
[ { "author_id": "t squires_1", "name": "Todd [\"M.\"] Squires", "publication_history": null, "h_index": null, "num_papers": null, "num_citations": null }, { "author_id": "m bazant_1", "name": "Martin [\"Z.\"] Bazant", "publication_history": null, "h_index": null, "num_...
null
10569808
quant-ph/0304161
2003-04-24
Sparse Graph Codes for Quantum Error-Correction
We present sparse graph codes appropriate for use in quantum error-correction. Quantum error-correcting codes based on sparse graphs are of interest for three reasons. First, the best codes currently known for classical channels are based on sparse graphs. Second, sparse graph codes keep the number of quantum interacti...
[ "quant-ph" ]
null
[ "target.key_reference" ]
null
null
null
18956336
hep-ex/0304033
2003-04-24
A RICH Multiplicity Veto for the HERA-B Experiment
We present the design and commissioning of a new multiplicity veto for the HERA-B detector, a fixed-target spectrometer originally designed to study the physics of B mesons in proton-nucleus interactions. The HERA-B trigger is a message-driven multi-level track trigger. The first level trigger (FLT) consists of custom-...
[ "hep-ex" ]
null
[ "target.author.publication_history" ]
[]
[ { "author_id": "u husemann_1", "name": "Ulrich Husemann", "publication_history": null, "h_index": null, "num_papers": null, "num_citations": null }, { "author_id": "m adams_9", "name": "M. [\"R.\"] Adams", "publication_history": null, "h_index": null, "num_papers": nu...
null
17437812
cond-mat/0304590
2003-04-25
Local excitations in mean field spin glasses
We address the question of geometrical as well as energetic properties of local excitations in mean field Ising spin glasses. We study analytically the Random Energy Model and numerically a dilute mean field model, first on tree-like graphs, equivalent to a replica symmetric computation, and then directly on finite con...
[ "cond-mat.dis-nn", "cond-mat.stat-mech" ]
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": "g parisi_1", "name": "Giorgio Parisi", "publication_history": null, "h_index": null, "num_papers": nul...
null
6431456
nlin/0304054
2003-04-26
Estimating good discrete partitions from observed data: symbolic false nearest neighbors
A symbolic analysis of observed time series data requires making a discrete partition of a continuous state space containing observations of the dynamics. A particular kind of partition, called ``generating'', preserves all dynamical information of a deterministic map in the symbolic representation, but such partitions...
[ "nlin.CD" ]
null
[ "target.author.publication_history.key_reference", "target.key_reference" ]
null
null
null
14098408
math/0304466
2003-04-28
Finite metric spaces--combinatorics, geometry and algorithms
Finite metric spaces arise in many different contexts. Enormous bodies of data, scientific, commercial and others can often be viewed as large metric spaces. It turns out that the metric of graphs reveals a lot of interesting information. Metric spaces also come up in many recent advances in the theory of algorithms. F...
[ "math.CO" ]
null
[ "target.author.publication_history.key_reference" ]
null
null
null
14670973
quant-ph/0304175
2003-04-28
Optimal realization of the transposition maps
We solve the problem of achieving the optimal physical approximation of the transposition for pure states of arbitrary quantum systems for finite and infinite dimensions. A unitary realization is also given for any finite dimension, which provides the optimal quantum cloning map of the ancilla as well.
[ "quant-ph" ]
null
[ "target.author.publication_history.key_reference" ]
null
null
null
11410381
astro-ph/0304509
2003-04-28
Effects of Systematic Uncertainties on the Supernova Determination of Cosmological Parameters
Mapping the recent expansion history of the universe offers the best hope for uncovering the characteristics of the dark energy believed to be responsible for the acceleration of the expansion. In determining cosmological and dark-energy parameters to the percent level, systematic uncertainties impose a floor on the ac...
[ "astro-ph" ]
null
[ "target.author.publication_history" ]
[ { "corpus_id": "895975", "num_citations": null }, { "corpus_id": "8894913", "num_citations": null }, { "corpus_id": "17395591", "num_citations": null }, { "corpus_id": "8630080", "num_citations": null } ]
[ { "author_id": "a kim_4", "name": "Alex [\"G\"] Kim", "publication_history": null, "h_index": null, "num_papers": null, "num_citations": null }, { "author_id": "e linder_1", "name": "Eric [\"V.\"] Linder", "publication_history": null, "h_index": null, "num_papers": nu...
null
27314281
astro-ph/0304489
2003-04-28
Interstellar Dust Grains
This review surveys the observed properties of interstellar dust grains: the wavelength-dependent extinction of starlight, including absorption features, from UV to IR; optical luminescence; IR emission; microwave emission; optical, UV, and X-ray scattering by dust; and polarization of starlight and of infrared emissio...
[ "astro-ph" ]
null
[ "target.author.publication_history.key_reference" ]
null
null
null
3265214
cs/0304042
2003-04-28
On probabilistic analog automata
We consider probabilistic automata on a general state space and study their computational power. The model is based on the concept of language recognition by probabilistic automata due to Rabin and models of analog computation in a noisy environment suggested by Maass and Orponen, and Maass and Sontag. Our main result ...
[ "cs.OH" ]
null
[ "target.author.publication_history" ]
[]
[ { "author_id": "a ben-hur_1", "name": "Asa Ben-Hur", "publication_history": null, "h_index": null, "num_papers": null, "num_citations": null }, { "author_id": "a roitershtein_0", "name": "Alexander Roitershtein", "publication_history": null, "h_index": null, "num_pape...
null
5744478
cond-mat/0304638
2003-04-28
Rapid Acquisition Pair Distribution Function (RA-PDF) Analysis
An image plate (IP) detector coupled with high energy synchrotron radiation was used for atomic pair distribution function (PDF) analysis, with high probed momentum transfer \Qmax $\leq 28.5$ \RAA from crystalline materials. Materials with different structural complexities were measured to test the validity of the quan...
[ "cond-mat" ]
null
[ "target.author.publication_history", "target.author.publication_history.key_reference" ]
[]
[ { "author_id": "p chupas_1", "name": "Peter [\"J.\"] Chupas", "publication_history": null, "h_index": null, "num_papers": null, "num_citations": null }, { "author_id": "x qiu_16", "name": "Xiangyun Qiu", "publication_history": null, "h_index": null, "num_papers": null...
null
15548263
cond-mat/0304668
2003-04-29
Elasticity-Driven Nanoscale Electronic Structure in Superconductors
The effects of long-range anisotropic elastic deformations on electronic structure in superconductors are analyzed within the framework of the Bogoliubov-de Gennes equations. Cases of twin boundaries and isolated defects are considered as illustrations. We find that the superconducting order parameter is depressed in t...
[ "cond-mat.supr-con", "cond-mat.mtrl-sci" ]
null
[ "target.author.publication_history" ]
[]
[ { "author_id": "j zhu_172", "name": "Jian-Xin Zhu", "publication_history": null, "h_index": null, "num_papers": null, "num_citations": null }, { "author_id": "k ahn_12", "name": "Keun [\"Hyuk\"] Ahn", "publication_history": null, "h_index": null, "num_papers": null, ...
null
13194127
cond-mat/0304670
2003-04-30
Does a Single Zealot Affect an Infinite Group of Voters ?
A method for studying exact properties of a class of {\it inhomogeneous} stochastic many-body systems is developed and presented in the framework of a voter model perturbed by the presence of a ``zealot'', an individual allowed to favour an opinion. We compute exactly the magnetization of this model and find that in on...
[ "cond-mat.stat-mech", "cond-mat.dis-nn", "physics.soc-ph" ]
null
[ "target.author.publication_history.key_reference" ]
null
null
null
4431481
astro-ph/0305004
2003-04-30
The elemental abundance pattern in a galaxy at z=2.626
The discovery of metal-poor stars (where metal is any element more massive than helium) has enabled astronomers to probe the chemical enrichment history of the Milky Way. More recently, element abundances in gas inside high-redshift galaxies has been probed through the absorption lines imprinted on the spectra of backg...
[ "astro-ph" ]
null
[ "target.author.publication_history.key_reference" ]
null
null
null
17084103
cond-mat/0304684
2003-04-30
A Fokker--Planck description for Parrondo's games
We discuss in detail two recently proposed relations between the Parrondo's games and the Fokker--Planck equation describing the flashing ratchet as the overdamped motion of a particle in a potential landscape. In both cases it is possible to relate exactly the probabilities of the games to the potential in which the o...
[ "cond-mat.stat-mech" ]
null
[ "target.author.publication_history" ]
[]
[ { "author_id": "r toral_1", "name": "Raúl Toral", "publication_history": null, "h_index": null, "num_papers": null, "num_citations": null }, { "author_id": "p amengual_1", "name": "Pau Amengual", "publication_history": null, "h_index": null, "num_papers": null, "n...
null
3932242
math/0304491
2003-04-30
Phase transitions in Phylogeny
We apply the theory of markov random fields on trees to derive a phase transition in the number of samples needed in order to reconstruct phylogenies. We consider the Cavender-Farris-Neyman model of evolution on trees, where all the inner nodes have degree at least 3, and the net transition on each edge is bounded by e...
[ "math.PR" ]
null
[ "target.author.publication_history", "target.author.publication_history.key_reference" ]
[]
[ { "author_id": "e mossel_1", "name": "Elchanan Mossel", "publication_history": null, "h_index": null, "num_papers": null, "num_citations": null } ]
null
16482224
math/0305015
2003-05-01
Mathematical modelling of the cardiovascular system
In this paper we will address the problem of developing mathematical models for the numerical simulation of the human circulatory system. In particular, we will focus our attention on the problem of haemodynamics in large human arteries.
[ "math.DS" ]
null
[ "target.author.publication_history" ]
[]
[ { "author_id": "a quarteroni_1", "name": "Alfio [\"Maria\"] Quarteroni", "publication_history": null, "h_index": null, "num_papers": null, "num_citations": null } ]
null
119080950
astro-ph/0305008
2003-05-01
Cosmological Results from High-z Supernovae
The High-z Supernova Search Team has discovered and observed 8 new supernovae in the redshift interval z=0.3-1.2. These independent observations, confirm the result of Riess et al. (1998a) and Perlmutter et al. (1999) that supernova luminosity distances imply an accelerating universe. More importantly, they extend the ...
[ "astro-ph" ]
null
[ "target.author.publication_history.key_reference" ]
null
null
null
16294840
math/0305039
2003-05-01
Markov Chain Sampling for Non-linear State Space Models Using Embedded Hidden Markov Models
I describe a new Markov chain method for sampling from the distribution of the state sequences in a non-linear state space model, given the observation sequence. This method updates all states in the sequence simultaneously using an embedded Hidden Markov model (HMM). An update begins with the creation of a ``pool'' of...
[ "math.PR" ]
null
[ "target.author.publication_history.key_reference" ]
null
null
null
2776847
math/0305052
2003-05-02
Deformations of associative algebras with inner products
We develop the deformation theory of A_\infty algebras together with \infty inner products and identify a differential graded Lie algebra that controls the theory. This generalizes the deformation theories of associative algebras, A_\infty algebras, associative algebras with inner products, and A_\infty algebras with i...
[ "math.QA" ]
null
[ "target.author.publication_history" ]
[]
[ { "author_id": "j terilla_1", "name": "John Terilla", "publication_history": null, "h_index": null, "num_papers": null, "num_citations": null }, { "author_id": "t tradler_1", "name": "Thomas Tradler", "publication_history": null, "h_index": null, "num_papers": null, ...
null
239778212
hep-ph/0305022
2003-05-02
Inconsistencies in Interpreting the Atmospheric Neutrino Anomaly
We note a discrepancy between the value of R expected on the basis of the muon neutrino angular distribution and the value actually observed. The energy independence of $R$ leads to a fine tuning problem. This may be indicative of some unaccounted for new physics.
[ "hep-ph" ]
null
[ "target.author.publication_history.key_reference" ]
null
null
null
16362945
cond-mat/0305042
2003-05-02
Scalings of domain wall energies in two dimensional Ising spin glasses
We study domain wall energies of two dimensional spin glasses. The scaling of these energies depends on the model's distribution of quenched random couplings, falling into three different classes. The first class is associated with the exponent theta =-0.28, the other two classes have theta = 0, as can be justified the...
[ "cond-mat.dis-nn", "cond-mat.stat-mech" ]
null
[ "target.author.publication_history.key_reference" ]
null
null
null
617
cs/0305002
2003-05-02
Hybrid Rounding Techniques for Knapsack Problems
We address the classical knapsack problem and a variant in which an upper bound is imposed on the number of items that can be selected. We show that appropriate combinations of rounding techniques yield novel and powerful ways of rounding. As an application of these techniques, we present a linear-storage Polynomial Ti...
[ "cs.CC", "cs.DM", "cs.DS" ]
null
[ "target.author.publication_history.key_reference" ]
null
null
null
12284829
math/0305062
2003-05-04
Casimir Operators and Monodromy Representations of Generalised Braid Groups
Let g be a complex, simple Lie algebra with Cartan subalgebra h and Weyl group W. We construct a one-parameter family of flat connections D on h with values in any finite-dimensional h-module V and simple poles on the root hyperplanes. The corresponding monodromy representation of the braid group B of type g is a defor...
[ "math.QA", "math.DG", "math.RT" ]
null
[ "target.author.publication_history.key_reference" ]
null
null
null
53768021
astro-ph/0305059
2003-05-05
Primordial Magnetic Fields and Causality
We discuss the implications of causality on a primordial magnetic field. We show that the residual field on large scales is much more suppressed than usually assumed and that a helical component is even more reduced. Due to this strong suppression, even maximal primordial fields generated at the electroweak phase trans...
[ "astro-ph" ]
null
[ "target.author.publication_history.key_reference" ]
null
null
null
24246257
quant-ph/0305023
2003-05-05
A subsystem-independent generalization of entanglement
We introduce a generalization of entanglement based on the idea that entanglement is relative to a distinguished subspace of observables rather than a distinguished subsystem decomposition. A pure quantum state is entangled relative to such a subspace if its expectations are a proper mixture of those of other states. M...
[ "quant-ph", "cond-mat" ]
null
[ "target.author.publication_history.key_reference" ]
null
null
null
11912125
cond-mat/0305104
2003-05-06
Anticipated synchronization: a metaphorical linear view
We study the regime of anticipated synchronization recently described on a number of dynamical systems including chaotic and noisy ones. We use simple linear caricatures to show the minimal setups able to reproduce the basic facts described.
[ "cond-mat", "nlin.CD" ]
null
[ "target.author.publication_history" ]
[]
[ { "author_id": "o calvo_1", "name": "Oscar Calvo", "publication_history": null, "h_index": null, "num_papers": null, "num_citations": null }, { "author_id": "d chialvo_1", "name": "Dante [\"R.\"] Chialvo", "publication_history": null, "h_index": null, "num_papers": nu...
null
119175618
math/0305092
2003-05-06
Small deviations for fractional stable processes
Let R be a symmetric a-stable Riemann-Liouville process with Hurst parameter H > 0. Consider ||.|| a translation invariant, b-self-similar, and p-pseudo-additive functional semi-norm. We show that if H > (b + 1/p) and c = (H - b - 1/p), then x log P [ log ||R|| < c log x ] -> - k < 0, when x -> 0, with k finite in the ...
[ "math.PR" ]
null
[ "target.author.publication_history.key_reference" ]
null
null
null
211247630
astro-ph/0305090
2003-05-06
MatlabMPI
The true costs of high performance computing are currently dominated by software. Addressing these costs requires shifting to high productivity languages such as Matlab. MatlabMPI is a Matlab implementation of the Message Passing Interface (MPI) standard and allows any Matlab program to exploit multiple processors. Mat...
[ "astro-ph" ]
null
[ "target.author.publication_history", "target.author.publication_history.key_reference" ]
[]
[ { "author_id": "j kepner_1", "name": "Jeremy Kepner", "publication_history": null, "h_index": null, "num_papers": null, "num_citations": null }, { "author_id": "s ahalt_1", "name": "Stanley [\"C.\"] Ahalt", "publication_history": null, "h_index": null, "num_papers": n...
null
26380502
quant-ph/0305035
2003-05-07
Equivalence of Additivity Questions in Quantum Information Theory
We reduce the number of open additivity problems in quantum information theory by showing that four of them are equivalent. We show that the conjectures of additivity of the minimum output entropy of a quantum channel, additivity of the Holevo expression for the classical capacity of a quantum channel, additivity of th...
[ "quant-ph", "math-ph", "math.MP" ]
null
[ "target.author.publication_history.key_reference" ]
null
null
null
14491418
astro-ph/0305093
2003-05-07
A Large, Uniform Sample of X-ray Emitting AGN: Selection Approach and an Initial Catalog from the ROSAT All-Sky and Sloan Digital Sky Surveys
Many open questions in X-ray astronomy are limited by the relatively small number of objects in uniform optically-identified samples, especially when rare subclasses are considered, or subsets isolated to search for evolution or correlations between wavebands. We describe initial results of a program aimed to ultimatel...
[ "astro-ph" ]
null
[ "target.author.publication_history.key_reference" ]
null
null
null
18216372
astro-ph/0305127
2003-05-08
From Molecular Cores to Planet-forming Disks: A SIRTF Legacy Program
Crucial steps in the formation of stars and planets can be studied only at mid-infrared to far-infrared wavelengths, where SIRTF provides an unprecedented improvement in sensitivity. We will use all three SIRTF instruments (IRAC, MIPS, and IRS) to observe sources that span the evolutionary sequence from molecular cores...
[ "astro-ph" ]
null
[ "target.author.publication_history.key_reference" ]
null
null
null
12848141
astro-ph/0305139
2003-05-08
The Spectra of T Dwarfs. II. Red Optical Data
We present 6300--10100 {\AA} spectra for a sample of 13 T dwarfs observed using LRIS mounted on the Keck I 10m Telescope. A variety of features are identified and analyzed, including pressure-broadened K I and Na I doublets; narrow Cs I and Rb I lines; weak CaH, CrH, and FeH bands; strong H$_2$O absorption; and a possi...
[ "astro-ph" ]
null
[ "target.author.publication_history.key_reference" ]
null
null
null
9345261
cond-mat/0305150
2003-05-08
Copied citations create renowned papers?
Recently we discovered (cond-mat/0212043) that the majority of scientific citations are copied from the lists of references used in other papers. Here we show that a model, in which a scientist picks three random papers, cites them,and also copies a quarter of their references accounts quantitatively for empirically ob...
[ "cond-mat.dis-nn", "physics.soc-ph" ]
null
[ "target.author.publication_history", "target.author.publication_history.key_reference" ]
[]
[ { "author_id": "m simkin_1", "name": "Mikhail [\"V.\"] Simkin", "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_index": nul...
null
270393
cs/0701193
2003-05-09
A Static Analyzer for Large Safety-Critical Software
We show that abstract interpretation-based static program analysis can be made efficient and precise enough to formally verify a class of properties for a family of large programs with few or no false alarms. This is achieved by refinement of a general purpose static analyzer and later adaptation to particular programs...
[ "cs.PL", "cs.PF" ]
null
[ "target.author.publication_history.key_reference" ]
null
null
null
14975456
math/0305176
2003-05-12
Measurable Categories and 2-Groups
Using the theory of measurable categories developped by Yetter in work in preparation, we provide a notion of representations of 2-groups more well-suited to physically and geometrically interesting examples than that proposed in unpublished work of Barrett and Mackaay using 2-VECT of Kapranov and Voevodsky. Using this...
[ "math.QA", "gr-qc", "math.RT" ]
null
[ "target.author.publication_history.key_reference" ]
null
null
null
5423628
astro-ph/0305197
2003-05-12
A Model-Independent Determination of the Expansion and Acceleration Rates of the Universe as a Function of Redshift and Constraints on Dark Energy
Determination of the expansion and acceleration history of the universe is one of the fundamental goals of cosmology. Detailed measurements of these rates as a function of redshift can provide new physical insights into the nature and evolution of the dark energy, which apparently dominates the global dynamics of the u...
[ "astro-ph" ]
null
[ "target.author.publication_history.key_reference" ]
null
null
null
12568072
astro-ph/0305192
2003-05-12
The XMM-LSS Survey. First high redshift galaxy clusters: relaxed and collapsing systems
We present five newly found galaxy clusters at z>0.6 from the XMM Large-Scale Structure Survey (XMM-LSS). All five objects are extended X-ray sources in the XMM images. For three of them we have sufficient spectroscopically confirmed member galaxies that an estimate of the velocity dispersion is possible: XLSSC 001 at ...
[ "astro-ph" ]
null
[ "target.author.publication_history", "target.author.publication_history.key_reference" ]
[ { "corpus_id": "14356675", "num_citations": null }, { "corpus_id": "118957341", "num_citations": null }, { "corpus_id": "15688769", "num_citations": null } ]
[ { "author_id": "i valtchanov_1", "name": "Ivan Valtchanov", "publication_history": null, "h_index": null, "num_papers": null, "num_citations": null }, { "author_id": "m pierre_2", "name": "Marguerite Pierre", "publication_history": null, "h_index": null, "num_papers":...
null
36085888
nlin/0305021
2003-05-12
Dynamical Instabilities of Quasi-static Crack Propagation Under Thermal Stress
We address the theory of quasi-static crack propagation in a strip of glass that is pulled from a hot oven towards a cold bath. This problem had been carefully studied in a number of experiments that offer a wealth of data to challenge the theory. We improve upon previous theoretical treatments in a number of ways. Fir...
[ "nlin.CD" ]
null
[ "target.author.publication_history", "target.author.publication_history.key_reference" ]
[]
[ { "author_id": "e bouchbinder_1", "name": "Eran Bouchbinder", "publication_history": null, "h_index": null, "num_papers": null, "num_citations": null }, { "author_id": "h hentschel_1", "name": "Hilary [\"G.\",\"E.\"] Hentschel", "publication_history": null, "h_index": nul...
null
1230902
math/0305160
2003-05-12
Optimal Nonlinear Prediction of Random Fields on Networks
It is increasingly common to encounter time-varying random fields on networks (metabolic networks, sensor arrays, distributed computing, etc.). This paper considers the problem of optimal, nonlinear prediction of these fields, showing from an information-theoretic perspective that it is formally identical to the proble...
[ "math.PR", "cond-mat.stat-mech", "nlin.CG", "physics.data-an" ]
null
[ "target.author.publication_history.key_reference" ]
null
null
null
17095077
astro-ph/0305191
2003-05-12
The XMM-LSS survey. Survey design and first results
We have designed a medium deep large area X-ray survey with XMM - the XMM Large Scale Structure survey, XMM-LSS - with the scope of extending the cosmological tests attempted using ROSAT cluster samples to two redshift bins between 0<z<1 while maintaining the precision of earlier studies. Two main goals have constraine...
[ "astro-ph" ]
null
[ "target.author.publication_history", "target.author.publication_history.key_reference" ]
[ { "corpus_id": "54646844", "num_citations": null }, { "corpus_id": "17892776", "num_citations": null }, { "corpus_id": "17342850", "num_citations": null }, { "corpus_id": "119527210", "num_citations": null } ]
[ { "author_id": "m pierre_2", "name": "Marguerite Pierre", "publication_history": null, "h_index": null, "num_papers": null, "num_citations": null }, { "author_id": "i valtchanov_1", "name": "Ivan Valtchanov", "publication_history": null, "h_index": null, "num_papers":...
null
14047001
hep-ex/0305019
2003-05-12
Collider Experiment: Strings, Branes and Extra Dimensions
Selected topics showcasing the exploration for new physics using colliders; presented at TASI 2001.
[ "hep-ex", "hep-ph" ]
null
[ "target.author.publication_history" ]
[]
[ { "author_id": "m spiropulu_1", "name": "Maria Spiropulu", "publication_history": null, "h_index": null, "num_papers": null, "num_citations": null } ]
null
1850216
astro-ph/0305196
2003-05-12
Sensitivity of the IceCube Detector to Astrophysical Sources of High Energy Muon Neutrinos
We present the results of a Monte-Carlo study of the sensitivity of the planned IceCube detector to predicted fluxes of muon neutrinos at TeV to PeV energies. A complete simulation of the detector and data analysis is used to study the detector's capability to search for muon neutrinos from sources such as active galax...
[ "astro-ph" ]
null
[ "target.author.publication_history.key_reference" ]
null
null
null
23306871
cond-mat/0305267
2003-05-12
NMR Experiments on a Three-Dimensional Vibrofluidized Granular Medium
A three-dimensional granular system fluidized by vertical container vibrations was studied using pulsed field gradient (PFG) NMR coupled with one-dimensional magnetic resonance imaging (MRI). The system consisted of mustard seeds vibrated vertically at 50 Hz, and the number of layers N_ell <= 4 was sufficiently low to ...
[ "cond-mat.soft" ]
null
[ "target.author.publication_history.key_reference" ]
null
null
null
14275409
astro-ph/0305189
2003-05-12
Measuring primordial non-Gaussianity in the cosmic microwave background
We derive a fast way for measuring primordial non-Gaussianity in a nearly full-sky map of the cosmic microwave background. We find a cubic combination of sky maps combining bispectrum configurations to capture a quadratic term in primordial fluctuations. Our method takes only N^1.5 operations rather than N^2.5 of the b...
[ "astro-ph" ]
null
[ "target.author.publication_history.key_reference" ]
null
null
null
15046646
cond-mat/0305277
2003-05-13
Prediction of the human life expectancy
We have simulated demographic changes in the human population using the Penna microscopic model, based on the simple Monte Carlo method. The results of simulations have shown that during a few generations changes in the genetic pool of a population are negligible, while improving the methods of compensation of genetic ...
[ "cond-mat.stat-mech", "q-bio.PE" ]
null
[ "target.author.publication_history.key_reference" ]
null
null
null
118189681
hep-ex/0305021
2003-05-13
Results on searches for new physics at HERA
The H1 and ZEUS collaborations have searched for signals of physics beyond the Standard Model in ep collisions at a center-of-mass energy of 301-319 GeV. During the HERA I phase each experiment accumulated an integrated luminosity of about 110 pb^{-1} for e^+p and about 15 pb^{-1} for e^-p collisions. The data have bee...
[ "hep-ex" ]
null
[ "target.author.publication_history" ]
[]
[ { "author_id": "j haller_1", "name": "Johannes Haller", "publication_history": null, "h_index": null, "num_papers": null, "num_citations": null } ]
null
7732706
physics/0305058
2003-05-14
Going forth and back in time: a fast and parsimonious algorithm for mixed initial/final-value problems
We present an efficient and parsimonious algorithm to solve mixed initial/final-value problems. The algorithm optimally limits the memory storage and the computational time requirements: with respect to a simple forward integration, the cost factor is only logarithmic in the number of time-steps. As an example, we disc...
[ "physics.comp-ph", "nlin.CD", "physics.flu-dyn" ]
null
[ "target.author.publication_history.key_reference" ]
null
null
null
17105768
cond-mat/0305316
2003-05-14
A spherical Hopfield model
We introduce a spherical Hopfield-type neural network involving neurons and patterns that are continuous variables. We study both the thermodynamics and dynamics of this model. In order to have a retrieval phase a quartic term is added to the Hamiltonian. The thermodynamics of the model is exactly solvable and the resu...
[ "cond-mat.dis-nn", "cond-mat.stat-mech", "q-bio" ]
null
[ "target.author.publication_history.key_reference" ]
null
null
null