13,710 research outputs found
On Multipolar Analytical Potentials for Galaxies
We present analytical potential-density pairs in three dimensions for the
gravitational field of galaxies, obtained by thickening the multipolar
expansion up to the quadrupole term. These may be interpreted as
generalizations of the Miyamoto and Nagai potential-density pairs. With a
suitable restriction on the possible values of the multipole moments, the
density distributions are positive and monotone decreasing functions of the
radial and axial coordinates
Asymmetries Between Strange and Antistrange Particle Production in Pion-Proton Interactions
Recent measurements of the asymmetries between Feynman distributions of
strange and antistrange hadrons in interactions show a strong effect
as a function of . We calculate strange hadron production in the context
of the intrinsic model and make predictions for particle/antiparticle
asymmetries in these interactions.Comment: version to be published in Nucl. Phys. A, 46 pages LaTeX, 15 .eps
figure
A General Relativistic Model for the Gravitational Field of Active Galactic Nuclei Surrounded by a Disk
An exact but simple general relativistic model for the gravitational field of
active galactic nuclei is constructed, based on the superposition in Weyl
coordinates of a black hole, a Chazy-Curzon disk and two rods, which represent
matter jets. The influence of the rods on the matter properties of the disk and
on its stability is examined. We find that in general they contribute to
destabilize the disk. Also the oscillation frequencies for perturbed circular
geodesics on the disk are computed, and some geodesic orbits for the superposed
metric are numerically calculated.Comment: 24 pages, LATEX. Phys. Rev. D (in press
The Extraction of the Gluon Density from Jet Production in Deeply Inelastic Scattering
The prospects of a direct extraction of the proton's gluon density in
next-to-leading order via jet rates in deeply inelastic scattering are studied.
The employed method is based on the Mellin transform, and can be applied, in
principle, to all infra-red-safe observables of hadronic final states. We
investigate the dependence of the error band on the extracted gluon
distribution on the statistical and systematic error of the data.Comment: 5 pages (Latex); 2 figures are included via epsfig; contribution to
the workshop ``Future Physics at HERA'' at DESY, Hamburg, 1995/96; to be
published in the proceedings; compressed postscript version also available at
http://wwwcn.cern.ch/~graudenz/publications.htm
The uniqueness of the invariant polarisation-tensor field for spin-1 particles in storage rings
We argue that the invariant tensor field introduced in [1] is unique under
the condition that the invariant spin field is unique, and thereby complete
that part of the discussion in that paper.Comment: 8 page
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