Coherent Active-Sterile Neutrino Flavor Transformation in the Early Universe - INSPIRE

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Coherent Active-Sterile Neutrino Flavor Transformation in the Early Universe

Jul, 2006

4 pages

Published in:

Phys.Rev.Lett. 97 (2006) 141301

e-Print:

astro-ph/0607403 [astro-ph]

DOI:

10.1103/PhysRevLett.97.141301

View in:

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Abstract: (arXiv)

We solve the problem of coherent Mikheyev-Smirnov-Wolfenstein (MSW) resonant active-to-sterile neutrino flavor conversion driven by an initial lepton number in the early universe. We find incomplete destruction of lepton number in this process and a sterile neutrino energy distribution with a distinctive cusp and high energy tail. These features imply alteration of the non-zero lepton number primordial nucleosynthesis paradigm when there exist sterile neutrinos with rest masses ~ 1 eV. This could result in better light element probes of (constraints on) these particles.

Note:

4 pages, 3 figures, matches version printed in PRL Journal-ref: Phys. Rev. Lett. 97, 141301 (2006) DOI: 10.1103/PhysRevLett.97.141301

14.60.Pq
14.60.St
98.80.Cq
26.35.+c
cosmological model
neutrino: oscillation
MSW effect: coherence
lepton number
neutrino: sterile
neutrino: energy spectrum

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