Neutrinoless Universe

Details Neutrinoless Universe Neutrinoless Universe

2004-04-29

arxiv.org/abs/astro-ph/0404585v2

Phys.Rev.Lett.93:121302,2004

Astronomy and Astrophysics

Astrophysics

4 pages, 2 figures. Minor changes. Accepted by PRL

Scientific paper

10.1103/PhysRevLett.93.121302

We consider the consequences for the relic neutrino abundance if extra neutrino interactions are allowed, e.g., the coupling of neutrinos to a light (compared to $m_\nu$) boson. For a wide range of couplings not excluded by other considerations, the relic neutrinos would annihilate to bosons at late times, and thus make a negligible contribution to the matter density today. This mechanism evades the neutrino mass limits arising from large scale structure.

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