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 ?

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 ?

By combining data from cosmic microwave background (CMB) experiments (including the recent BOOMERANG-2K2 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 < 0.55eV at 95% c.l.. These results exclude at high signific...

ar X iv : h ep - p h / 05 06 01 6 v 1 2 J un 2 00 5 Theory Summary of the Electroweak Session for Moriond 2005

I broadly summarize the theoretical contributions in the Electroweak session of the 2005 Moriond meeting under four rubrics: i) neutrinos; ii) cosmology; iii) electroweak interactions; and iv) flavor physics.

ar X iv : a st ro - p h / 06 06 12 4 v 1 6 J un 2 00 6 Inhomogeneous Cosmology , Inflation and Late - Time Accelerating Universe

An inhomogeneous cosmology describing a spacetime without symmetry is shown to be able to inflate the early universe and explain the late-time acceleration of the universe without a cosmological constant and negative pressure dark energy and avoid the coincidence problem. e-mail: [email protected]

ar X iv : a st ro - p h / 99 02 26 6 v 2 3 A pr 2 00 0 High Energy Cosmic Rays from Neutrinos

We address a class of models in which neutrinos, having a small mass, originate the highest energy cosmic rays interacting with the relic cosmic neutrino background. Assuming lepton number symmetry and an enhanced neutrino

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