ar X iv : a st ro - p h / 02 07 37 4 v 1 1 8 Ju l 2 00 2 MC 3 D - 3 D Continuum Radiative Transfer

ar X iv : a st ro - p h / 06 12 37 8 v 1 1 4 D ec 2 00 6 Magnetic fields , strings and cosmology

ar X iv : a st ro - p h / 02 07 41 9 v 1 1 9 Ju l 2 00 2 Rarefaction Shocks , Shock Errors and Low Order of Accuracy in ZEUS

ar X iv : a st ro - p h / 02 12 56 6 v 1 3 0 D ec 2 00 2 Dark Energy : Is it Q or Λ ?

New observations of Cosmic Microwave Background Anisotropies, Su-pernovae luminosity distances and Galaxy Clustering are sharpening our knowledge about dark energy. Here we present the latest constraints.

ar X iv : a st ro - p h / 02 11 45 7 v 2 1 0 D ec 2 00 2 Time variation of fundamental constants : two phenomenological models

Time variation of fundamental constants, a strong signal of new physics, is analyzed comparing extant data with two phenomenological models. Results are discussed.

ar X iv : a st ro - p h / 02 07 64 3 v 1 3 0 Ju l 2 00 2 A New Orbital Ephemeris and Reinterpretation of Spectroscopic

We have analyzed nearly eight years of MACHO optical photometry of the supersoft X-ray binary RX J0513.9−6951 and derived a revised orbital period and ephemeris. Previously published velocities are reinterpreted using the new ephemeris. We show that the spectroscopic characteristics of the system depend strongly on whether the system is in a high or low optical state. We also discuss the proper...