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166 papers · 1 filter

cond-mat.dis-nn1998★ 142 cited

Critical Behavior and Griffiths-McCoy Singularities in the Two-Dimensional Random Quantum Ising Ferromagnet

C. Pich, A. P. Young, H. Rieger +1

We study the quantum phase transition in the two-dimensional random Ising model in a transverse field by Monte Carlo simulations. We find results similar to those known analyticall…

math.DG1998★ 5 cited

Holonomy on Poisson Manifolds and the Modular Class

Viktor L. Ginzburg, Alex Golubev

We introduce linear holonomy on Poisson manifolds. The linear holonomy of a Poisson structure generalizes the linearized holonomy on a regular symplectic foliation. However, for si…

astro-ph1998★ 65 cited

Evolutionary Histories of Dwarf Galaxies in the Local Group

Eva K. Grebel

The star formation histories of Local Group (LG) dwarf galaxies and more distant potential LG members are reviewed. Problems in defining the spatial extent of the LG and membership…

astro-ph1998★ 89 cited

Probing Galaxy Formation with TeV Gamma Ray Absorption

Joel R. Primack, James S. Bullock, Rachel S. Somerville +1

We present here the extragalactic background light (EBL) predicted by semi-analytic models of galaxy formation, and show how measurements of the absorption of gamma rays of …

astro-ph1998★ 6 cited

Constraining the IMF using TeV gamma ray absorption

J. S. Bullock, R. S. Somerville, D. MacMinn +1

Gamma rays of ~TeV energies from distant sources suffer attenuation due to pair production off of ~1 micron EBL photons. We may exploit this process in order to indirectly measure…

astro-ph1998★ 1 cited

Making Damped Lyman Alpha Systems in Semi-Analytic Models

Ariyeh H. Maller, Rachel S. Somerville, Jason X. Prochaska +1

The velocity profiles of weak metal absorption lines can be used to observationally probe the kinematic state of gas in damped Lyman-alpha systems. Prochaska and Wolfe have argued…

astro-ph1998

Cosmological Implications of Lyman-Break Galaxy Clustering

Risa H. Wechsler, Michael A. K. Gross, Joel R. Primack +3

We review our analysis of the clustering properties of ``Lyman-break'' galaxies (LBGs) at redshift z~3, previously discussed in Wechsler et al (1998). We examine the likelihood of…

hep-ph1998★ 24 cited

Correlated Wave Packet treatment of Neutrino and Neutral Meson Oscillations

Michael Nauenberg

A quantum wave packet treatment of neutrino and neutral K and B meson oscillations is presented which incorporates the recoil particle in the production process, and includes the e…

astro-ph1998★ 34 cited

An IR Search for Extinguished Supernovae in Starburst Galaxies

Bruce Grossan, Earl Spillar, Robert Tripp +3

IR and Radio band observations of heavily extinguished regions in starburst galaxies suggest a very high SN rate associated with such regions. Optically measured supernova (SN) rat…

astro-ph1998★ 3 cited

Formation of Dark Matter Halos

J. R. Primack, J. S. Bullock, A. A. Klypin +1

This article concerns the formation and structure of dark matter halos, including (1) their radial density profiles, (2) their abundance, and (3) their merger rates. The last topic…

hep-ex1998★ 10 cited

Measurement of the form-factor ratios for D_s^+ -> phi ell^+ nu_ell

Fermilab E791 Collaboration, E. M. Aitala, S. Amato

We have measured the form factor ratios r_V = V(0)/A_1(0) and r_2 = A_2(0)/A_1(0) for the decay D_s^+ -> phi ell^+ nu_ell, phi -> K^+ K^-, using data from charm hadroproduction exp…

astro-ph1998★ 117 cited

POTENT Reconstruction from Mark III Velocities

A. Dekel, A. Eldar, T. Kolatt +5

We present an improved POTENT method for reconstructing the velocity and mass density fields from radial peculiar velocities, test it with mock catalogs, and apply it to the Mark I…

astro-ph1998★ 101 cited

The HST Key Project on the Extragalactic Distance Scale. XV. A Cepheid Distance to the Fornax Cluster and Its Implications

Barry F. Madore, Wendy L. Freedman, N. Silbermann +13

Using the Hubble Space Telescope (HST) 37 long-period Cepheid variables have been discovered in the Fornax Cluster spiral galaxy NGC 1365. The resulting V and I period-luminosity r…

astro-ph1998★ 130 cited

Precession of collimated outflows from young stellar objects

C. Terquem, J. Eisloffel, J. Papaloizou +1

We consider several protostellar systems where either a precessing jet or at least two misaligned jets have been observed. We assume that the precession of jets is caused by tidal…

astro-ph1998★ 6 cited

Conceptual Design of a Next-Generation All-Sky Gamma-Ray Telescope Operating at TeV Energies

R. S. Miller, S. Westerhoff

The next generation all-sky monitor operating at TeV (0.1 - 30 TeV) energies should be capable of performing a continuous high sensitivity sky survey, and detecting transient sourc…

cond-mat1998★ 7 cited

Incipient failure in sandpile models

O. Narayan, S. R. Nagel

Elastoplastic and constitutive equation theories are two approaches based on very different assumptions for creating a continuum theory for the stress distributions in a static san…

cond-mat1998★ 7 cited

The 2-d Coulomb Gas on a 1-d lattice

O. Narayan, B. S. Shastry

The statistical mechanics of a two dimensional Coulomb gas confined to one dimension is studied, wherein hard core particles move on a ring. Exact self-duality is shown for a versi…

astro-ph1998★ 53 cited

Properties of Two New M31 dSph Companions from Keck Imaging

Eva K. Grebel, Puragra Guhathakurta

We have obtained Keck Low Resolution Imaging Spectrograph images in V and I of the newly discovered Local Group dwarf galaxies Pegasus dSph and Cassiopeia dSph and their surroundin…

math.DG1998

On semifree symplectic circle actions with isolated fixed points

Susan Tolman, Jonathan Weitsman

Let be a symplectic manifold, equipped with a semifree symplectic circle action with a finite, nonempty fixed point set. We show that the circle action must be Hamiltonian, and…

astro-ph1998★ 210 cited

What Can the Accretion Induced Collapse of White Dwarfs Really Explain?

C. L. Fryer, W. Benz, M. Herant +1

The accretion induced collapse (AIC) of a white dwarf into a neutron star has been invoked to explain gamma-ray bursts, Type Ia supernovae, and a number of problematic neutron star…

math.FA1998★ 38 cited

Determinants of Airy Operators and Applications to Random Matrices

Estelle L. Basor, Harold Widom

The purpose of this paper is to describe asymptotic formulas for determinants of certain operators that are analogues of Wiener-Hopf operators. The determinant formulas yield infor…

cond-mat.supr-con1998★ 4 cited

Casimir Force between Vortex Matter in Anisotropic and Layered Superconductors

H. G. Katzgraber, H. P. Büchler, G. Blatter

We present a new approach to calculate the attractive long range vortex-vortex interaction of the van der Waals type present in anisotropic and layered superconductors. The mapping…

astro-ph1998★ 62 cited

Towards an Understanding of the Globular Cluster Over--abundance around the Central Giant Elliptical NGC 1399

Markus Kissler-Patig, Carl J. Grillmair, Georges Meylan +3

We investigate the kinematics of a combined sample of 74 globular clusters around NGC 1399. Their high velocity dispersion, increasing with radius, supports their association with…

hep-ex1998★ 9 cited

Search for the Standard Model Higgs boson at the LEP2 collider near sqrt(S) = 183GeV

ALEPH Collaboration

During 1997 the ALEPH experiment at LEP gathered 57pb^-1 of data at centre-of- mass energies near 183 GeV. These data are used to look for possible signals from the production of t…