http://arxiv.org/abs/1403.5995
We study the feasibility whether or not a sterile neutrino could solve the primordial Li problem within a simple model; that is, standard model plus a sterile neutrino. We analyze effects of the decay of sterile neutrino on cosmological observables, and show that partial reduction can be achieved in the parameter regions of ${\cal O}$(10) MeV for sterile neutrino mass and ${\cal O}(10^5)$ sec for its lifetime, which are consistent with both constraints from experiments of the sterile neutrino searches and astrophysical observations. We also show the possibility of detection of the sterile neutrino, measuring the decay such as $\pi^+\to\mu^++\nu_s$.
H. Ishida, M. Kusakabe and H. Okada
Tue, 25 Mar 14
45/79
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