Probing Unstable Massive Neutrinos with Current Cosmic Microwave Background Observations

Details Probing Unstable Massive Neutrinos with Current Cosmic Microwave Background Observations Probing Unstable Massive Neutrinos with Current Cosmic Microwave Background Observations

1998-06-08

arxiv.org/abs/astro-ph/9806116v1

Phys.Rev.Lett. 81 (1998) 3075-3078

Astronomy and Astrophysics

Astrophysics

5 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.81.3075

The pattern of anisotropies in the Cosmic Microwave Background depends upon the masses and lifetimes of the three neutrino species. A neutrino species of mass greater than 10 eV with lifetime between 10^{13} sec and 10^{17} sec leaves a very distinct signature (due to the integrated Sachs-Wolfe effect): the anisotropies at large angles are predicted to be comparable to those on degree scales. Present data exclude such a possibility and hence this region of parameter space. For $m_\nu \simeq 30$ eV, $\tau \simeq 10^{13}$ sec, we find an interesting possibility: the Integrated Sachs Wolfe peak produced by the decaying neutrino in low-$\Omega$ models mimics the acoustic peak expected in an $\Omega = 1$ model.

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