Low reheating temperature and the visible sterile neutrino

Details Low reheating temperature and the visible sterile neutrino Low reheating temperature and the visible sterile neutrino

2004-03-13

arxiv.org/abs/astro-ph/0403323v1

Phys.Rev.Lett. 93 (2004) 081302

Astronomy and Astrophysics

Astrophysics

4 pages, 2 figures

Scientific paper

10.1103/PhysRevLett.93.081302

We present here a scenario, based on a low reheating temperature T_R << 100 MeV at the end of (the last episode of) inflation, in which the coupling of sterile neutrinos to active neutrinos can be as large as experimental bounds permit (thus making this neutrino ``visible'' in future experiments). In previous models this coupling was forced to be very small to prevent a cosmological overabundance of sterile neutrinos. Here the abundance depends on how low the reheating temperature is. For example, the sterile neutrino required by the LSND result does not have any cosmological problem within our scenario.

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