ar X iv : a st ro - p h / 05 11 50 0 v 1 17 N ov 2 00 5 Is cosmology compatible with sterile neutrinos ?

ar X iv : a st ro - p h / 05 11 50 0 v 3 29 J un 2 00 6 Is cosmology compatible with sterile neutrinos ?

By combining data from cosmic microwave background (CMB) experiments (including the recent WMAP third year results), large scale structure (LSS) and Lyman-α forest observations, we constrain the hypothesis of a fourth, sterile, massive neutrino. For the 3 massless + 1 massive neutrino case we bound the mass of the sterile neutrino to ms < 0.26eV (0.44eV) at 95% (99.9%) c.l.. These results exclu...

ar X iv : a st ro - p h / 05 11 83 5 v 1 3 0 N ov 2 00 5 Binaries with total eclipses in the LMC : potential targets for spectroscopy

35 Eclipsing binaries presenting unambiguous total eclipses were selected from a subsample of the list of Wyrzykowski et al. (2003). The photometric elements are given for the I curve in DiA photometry, as well as approximate Teff and masses of the components. The interest of these systems is stressed in view of future spectroscopic observations.

ar X iv : a st ro - p h / 02 11 45 7 v 1 2 0 N ov 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 / 01 11 13 6 v 1 7 N ov 2 00 1 1 Active Optics in Modern , Large Optical Telescopes

ar X iv : a st ro - p h / 04 11 65 0 v 1 2 3 N ov 2 00 4 Clusters of Galaxies : New Results from the CLEF Hydrodynamics Simulation

Preliminary results are presented from the CLEF hydrodynamics simulation, a large (N = 2 × 428 3 particles within a 200 h −1 Mpc comoving box) simulation of the ΛCDM cosmology that includes both radiative cooling and a simple model for galac-tic feedback. Specifically, we focus on the X-ray properties of the simulated clusters at z = 0 and demonstrate a reasonable level of agreement between sim...