Showing 1997Show all

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cond-mat.stat-mech1997★ 2 cited

Diagram expansions in classical stochastic field theory

L. I. Plimak, M. Fleischhauer, M. J. Collett +1

A diagram approach to classical nonlinear stochastic field theory is introduced. This approach is intended to serve as a link between quantum and classical field theories, resultin…

astro-ph1997★ 8 cited

The galactic dynamo effect due to Parker-shearing instability of magnetic flux tubes. III. The fast dynamo model

M. Hanasz, H. Lesch

We present a new fast dynamo model for galactic magnetic fields, which is based on the Parker-shearing instability and magnetic reconnection, in the spirit of the model proposed by…

gr-qc1997★ 93 cited

Inflation without Slow Roll

Thibault Damour, Viatcheslav F. Mukhanov

We draw attention to the possibility that inflation (i.e. accelerated expansion) might continue after the end of slow roll, during a period of fast oscillations of the inflaton fie…

cond-mat1997★ 10 cited

Thermal Properties of Interacting Bose Fields and Imaginary-Time Stochastic Differential Equations

L. I. Plimak, M. Fleischhauer, D. F. Walls

Matsubara Green's functions for interacting bosons are expressed as classical statistical averages corresponding to a linear imaginary-time stochastic differential equation. This m…

astro-ph1997★ 33 cited

A global descriptor of spatial pattern interaction in the galaxy distribution

Martin Kerscher, Maria Jesus Pons-Borderia, Jens Schmalzing +4

We present the function J as a morphological descriptor for point patterns formed by the distribution of galaxies in the Universe. This function was recently introduced in the fiel…

astro-ph1997

Luminous Cluster Ellipticals as Cosmological Standard Rods?

R. Bender, R. P. Saglia, B. Ziegler +2

We explore the possibility to calibrate massive cluster ellipticals as cosmological standard rods. The method is based on the Fundamental Plane relation combined with a correction…

astro-ph1997★ 11 cited

Accretion Disks and the Lyman Continuum Polarization of QSOs

Gregory A. Shields, Lance Wobus, Dirk Husfeld

HST observations of some QSOs show a strong, abrupt increase in polarization at rest wavelength about 750 A, suggestive of a connection with the Lyman edge of hydrogen. Blaes and A…

hep-th1997★ 41 cited

A Note on the Geometry of CHL Heterotic Strings

W. Lerche, R. Minasian, C. Schweigert +1

We present a few remarks on disconnected components of the moduli space of heterotic string compactifications on . We show in particular how the eight dimensional CHL heteroti…

hep-ex1997★ 173 cited

Polarised Quark Distributions in the Nucleon from Semi-Inclusive Spin Asymmetries

Spin Muon Collaboration

We present a measurement of semi-inclusive spin asymmetries for positively and negatively charged hadrons from deep inelastic scattering of polarised muons on polarised protons and…

astro-ph1997★ 7 cited

Real-Time Spectroscopy of Gravitational Microlensing Events - Probing the Evolution of the Galactic Bulge

D. Lennon, S. Mao, J. Reetz +3

We describe a real-time spectroscopic program to observe bright gravitational microlensing events toward the Galactic Bulge. The program is carried out using the NTT at ESO. We pre…

nucl-th1997★ 70 cited

Neutron star properties with relativistic equations of state

H. Huber, F. Weber, M. K. Weigel +1

We study the properties of neutron stars adopting relativistic equations of state of neutron star matter, calculated in the framework of the relativistic Brueckner-Hartree-Fock app…

astro-ph1997

A New Large Catalog of Groups of Galaxies in the Southern Galactic Hemisphere

Roberto Trasarti-Battistoni

We present a large catalog of loose groups of galaxies selected from the Perseus-Pisces redshift Survey.

astro-ph1997★ 1 cited

Characterizing cluster morphology using vector-valued Minkowski functionals

Claus Beisbart, Thomas Buchert

The morphology of galaxy clusters is quantified using Minkowski functionals, especially the vector-valued ones, which contain directional information and are related to curvature c…

hep-th1997★ 13 cited

Strings from Orientifolds

Stefan Forste, Debashis Ghoshal

We construct models in 1+1 dimensions with chiral (0,N) supersymmetry by taking orientifolds of type IIB on an eight-torus identified by different numbers of reflections. The resul…

astro-ph1997★ 29 cited

Loose Groups of Galaxies in the Perseus-Pisces Survey

Roberto Trasarti-Battistoni

We present a large catalog of loose groups of galaxies in the Southern Galactic Hemisphere, selected from the Perseus-Pisces redshift Survey (PPS). Particular care is taken in orde…

nucl-th1997

Quasireal photons in nucleus-nucleus collisions at intermediate and high energies, applications to nuclear structure, nuclear astrophysics and particle physics

G. Baur, S. Typel, H. H. Wolter

Introduction Theory of electromagnetic excitation and dissociation (Inelastic scattering at high energies: one-photon exchange, semiclassical approach and Glauber theory; Higher or…

cond-mat1997★ 34 cited

Magneto-Transport in the Two-Dimensional Lorentz Gas

Alexander Kuzmany, Herbert Spohn

We consider the two-dimensional Lorentz gas with Poisson distributed hard disk scatterers and a constant magnetic field perpendicular to the plane of motion. The velocity autocorre…

astro-ph1997★ 2 cited

M32-like galaxies: still very rare -- M32 analogues do not exist in the Leo group

Bodo L. Ziegler, Ralf Bender

New observations of galaxies in the direction of the Leo group, which were classified as being candidates for M32-like dwarf galaxies by Ferguson & Sandage (1990), show that these…

astro-ph1997★ 9 cited

Regularity in the distribution of superclusters

Martin Kerscher

Using a measure of clustering derived from the nearest neighbour distribution and the void probability function we are able to distinguish between regular and clustered structures.…

astro-ph1997★ 50 cited

More evidence for an intracluster planetary nebulae population in the Virgo cluster

R. H. Mendez, M. A. Guerrero, K. C. Freeman +5

We surveyed a 50 sq arcmin region in the Virgo cluster core to search for intergalactic planetary nebulae, and found 11 candidates in the surveyed area. The measured fluxes of thes…

astro-ph1997★ 68 cited

Density Perturbations in Multifield Inflationary Models

V. F. Mukhanov, Paul J. Steinhardt

We derive a closed-form, analytical expression for the spectrum of long-wavelength density perturbations in inflationary models with two (or more) inflaton degrees of freedom that…

astro-ph1997★ 120 cited

Neutral sodium from comet Hale-Bopp: a third type of tail

G. Cremonese, H. Boehnhardt, J. Crovisier +7

We report on the discovery and analysis of a striking neutral sodium gas tail associated with comet C/1995 O1 Hale-Bopp. Sodium D-line emission has been observed at heliocentric di…

hep-th1997★ 21 cited

Matching the BPS Spectra of Heterotic - Type I - Type I' Strings

D. Matalliotakis, H. P. Nilles, S. Theisen

We give a detailed discussion of the matching of the BPS states of heterotic, type I and type I' theories in d=9 for general backgrounds. This allows us to explicitly identify thes…

hep-ph1997★ 1 cited

Higher Dimensional Operators in Top Condensation from a Renormalization Group Point of View

Andreas Blumhofer, Richard Dawid, Johannes Manus

The predictive power of top-condensation models strongly depends on the behaviour of higher dimensional operators. These are analyzed in this paper by an extension of the standard…