Probing neutrino decays with the cosmic microwave background

Details Probing neutrino decays with the cosmic microwave background Probing neutrino decays with the cosmic microwave background

1999-03-31

arxiv.org/abs/astro-ph/9903475v1

Phys.Rev. D59 (1999) 125020

Astronomy and Astrophysics

Astrophysics

8 pages, 4 figures, to appear in Phys. Rev. D

Scientific paper

10.1103/PhysRevD.59.125020

We investigate in detail the possibility of constraining neutrino decays with data from the cosmic microwave background radiation (CMBR). Two generic decays are considered \nu_H -> \nu_L \phi and \nu_H -> \nu_L \nu_L_bar \nu_L. We have solved the momentum dependent Boltzmann equation in order to account for possible relativistic decays. Doing this we estimate that any neutrino with mass m > 1 eV decaying before the present should be detectable with future CMBR data. Combining this result with other results on stable neutrinos, any neutrino mass of the order 1 eV should be detectable.

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