Probing Unstable Massive Neutrinos with Current CMB Observations

Details Probing Unstable Massive Neutrinos with Current CMB Observations Probing Unstable Massive Neutrinos with Current CMB Observations

Dec 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998tx19.confe.575l&link_type=abstract

Abstracts of the 19th Texas Symposium on Relativistic Astrophysics and Cosmology, held in Paris, France, Dec. 14-18, 1998. Eds.:

Astronomy and Astrophysics

Astrophysics

Scientific paper

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 1013 and 1017 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 ~30 eV, tau ~1013 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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