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Cosmic microwave background anisotropy in the decaying neutrino cosmology

Authors:	J A Adams S Sarkar & D W Sciama

Institution:	Department of Theoretical Physics, Uppsala University, Box 803, S-75108, Uppsala, Sweden,;Theoretical Physics, University of Oxford, 1 Keble Road, Oxford OX1 3NP,;SISSA, ICTP, Strada Costiera 11, 34014 Trieste, Italy,;Nuclear and Astrophysics Laboratory, University of Oxford, Keble Road, Oxford OX1 3RH

Abstract:	It is attractive to suppose for several astrophysical reasons that the Universe has close to the critical density in light (～30 eV) neutrinos which decay radiatively with a lifetime of ～10²³ s. In such a cosmology the Universe is re-ionized early and the last scattering surface of the cosmic microwave background significantly broadened. We calculate the resulting angular power spectrum of temperature fluctuations in the cosmic microwave background. As expected, the acoustic peaks are significantly damped relative to the standard case. This would allow a definitive test of the decaying neutrino cosmology with the forthcoming MAP Planck surveyor missions.

Keywords:	cosmic microwave background dark matter