X iv : a st ro - p h / 97 06 05 3 v 1 5 J un 1 99 7 Astrophysical Sources of Stochastic Gravitational Radiation in the Universe

iv : a st ro - p h / 97 05 01 6 v 1 5 M ay 1 99 7 Post - Inflationary Reheating and Perturbations of the Cosmic Microwave

We formulate a gradual dynamical transition from a power-law inflation era with a scalar field to a radiation era with no scalar field including inhomogeneous perturbations to the FriedmannRobertson-Walker universe. We show that for the cosmic microwave background radiation fluctuations this is excellently approximated by a sudden transition, with application of the Lichnerowicz conditions, bot...

ar X iv : a st ro - p h / 97 06 06 5 v 1 6 J un 1 99 7 Discovery of the X - Ray Afterglow of the Gamma - Ray Burst of February 28 1997

ar X iv : a st ro - p h / 99 06 10 7 v 1 7 J un 1 99 9 A Neural Network - based ARX Model of Virgo Noise

In this paper a Neural Networks based approach is presented to identify the noise in the VIRGO context. VIRGO is an experiment to detect Gravitational Waves by means of a Laser Interferometer. Preliminary results appear to be very promising for data analysis of realistic Interfer-ometer outputs.

ar X iv : a st ro - p h / 98 06 05 4 v 1 3 J un 1 99 8 2 . 5 – 11 . 6 μ spectrophotometry and imaging of the CfA sample

We present low resolution spectrophotometric and imaging ISO observations of a sample of 54 AGN's over the 2.5–11 µ range. The observations generally support unification schemes and set new constraints on models of the molecular torus.

ar X iv : a st ro - p h / 93 05 00 2 v 1 6 M ay 1 99 3 Visibility of Gravitational Lenses and the Cosmological Constant Problem

Recent observations suggest appreciable star formation activity in early-type galaxies down to redshift z ∼ 0.5. If so, there is likely to be dust in these galaxies. We consider the possibility that obscuration by dust can reconcile the observed frequency of gravitational lensing of quasar images with the considerably larger rate predicted in a low density cosmologically flat universe dominated...