Phys. Rev. Lett. 98, 171301 (2007) [4 pages]Cosmological Neutrino Mass Detection: The Best Probe of Neutrino LifetimeReceived 26 January 2007; revised 20 March 2007; published 23 April 2007 Future cosmological data may be sensitive to the effects of a finite sum of neutrino masses even as small as ∼0.06 eV, the lower limit guaranteed by neutrino oscillation experiments. We show that a cosmological detection of neutrino mass at that level would improve by many orders of magnitude the existing limits on neutrino lifetime, and as a consequence, on neutrino secret interactions with (quasi)massless particles as in Majoron models. On the other hand, neutrino decay may provide a way out to explain a discrepancy ≲0.1 eV between cosmic neutrino bounds and lab data. © 2007 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.98.171301
DOI:
10.1103/PhysRevLett.98.171301
PACS:
98.80.Es, 13.35.Hb, 14.60.Pq, 98.80.Cq
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