Coherent Active-Sterile Neutrino Flavor Transformation in the Early Universe

Chad T. Kishimoto; Christel J. Smith; George M. Fuller

Coherent Active-Sterile Neutrino Flavor Transformation in the Early Universe

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arxiv astro-ph/0607403 v2 pith:U3RXBSQN submitted 2006-07-18 astro-ph hep-ph

Chad T. Kishimoto , George M. Fuller , Christel J. Smith This is my paper

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keywords leptonneutrinonumbercoherentearlyenergyflavorsterile

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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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Multiple Populations of Same Sterile Neutrino as Dark Matter
hep-ph 2025-07 conditional novelty 6.0 of 10

A single sterile neutrino species can be produced by multiple early-universe mechanisms, yielding cold and warm dark matter populations with a two-humped momentum spectrum.

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