Coherent Active-Sterile Neutrino Flavor Transformation in the Early Universe

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

2006-07-18

arxiv.org/abs/astro-ph/0607403v2

Phys.Rev.Lett. 97 (2006) 141301

Astronomy and Astrophysics

Astrophysics

4 pages, 3 figures, matches version printed in PRL

Scientific paper

10.1103/PhysRevLett.97.141301

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.

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