Constraints on radiative decay of the 17-keV neutrino from COBE Measurements

Details Constraints on radiative decay of the 17-keV neutrino from COBE Measurements Constraints on radiative decay of the 17-keV neutrino from COBE Measurements

1992-08-12

arxiv.org/abs/astro-ph/9208004v1

Phys.Rev. D46 (1992) 2341-2344

Astronomy and Astrophysics

Astrophysics

7 pages. (figures will be sent on request) (To appear in Phys. Rev. D.)

Scientific paper

10.1103/PhysRevD.46.2341

It is shown that, for a nontrivial radiative decay channel of the 17-keV neutrino, the photons would distort the microwave background radiation through ionization of the universe. The constraint on the branching ratio of such decays from COBE measurements is found to be more stringent than that from other considerations. The limit on the branching ratio in terms of the Compton $y$ parameter is $B_\gamma < 1.5 \times 10^{-7} ({\tau_\nu \over 10^{11} sec})^{0.45} ({y \over 10^{-3}})^{1.11} h^{-1}$ for an $\Omega=1, \Omega_b=0.1$ universe.

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