Phys. Rev. Lett. 93, 121302 (2004) [4 pages]Neutrinoless UniverseReceived 29 April 2004; published 16 September 2004 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 mν) 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. © 2004 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.93.121302
DOI:
10.1103/PhysRevLett.93.121302
PACS:
95.35.+d, 13.35.Hb, 14.60.Pq, 98.80.Cq
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