Cosmology of "Visible" Sterile Neutrinos

Details Cosmology of "Visible" Sterile Neutrinos Cosmology of "Visible" Sterile Neutrinos

2004-12-21

arxiv.org/abs/hep-ph/0412304v1

Int.J.Mod.Phys. A20 (2005) 4670-4675

Physics

High Energy Physics

High Energy Physics - Phenomenology

Talk given at the ``8th Workshop on Non-Perturbative Quantum Chromodynamics", June 7-11, 2004, Paris, France; 7 pages, 2 figur

Scientific paper

10.1142/S0217751X05028363

We point out that in scenarios with a low reheating temperature $T_R << 100$ MeV at the end of (the last episode of) inflation or entropy production, the abundance of sterile neutrinos becomes largely independent of their coupling to active neutrinos. Thus, cosmological bounds become less stringent than usually assumed, allowing sterile neutrinos to be ``visible'' in future experiments. For example, the sterile neutrino required by the LSND result does not have any cosmological problem within these scenarios.

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