Oscillation effects on thermalization of the neutrinos in the universe with low reheating temperature

By K. Ichikawa, M. Kawasaki, F. Takahashi. 2005

166 citations recorded by the source corpus.

We study how the oscillations of the neutrinos affect their thermalization process during the reheating period with temperature O(1) MeV in the early universe. We follow the evolution of the neutrino density matrices and investigate how the predictions of big bang nucleosynthesis vary with the reheating temperature. For the reheating temperature of several MeV, we find that including the oscillations makes different predictions, especially for {sup 4}He abundance. Also, the effects on the lower bound of the reheating temperature from cosmological observations are discussed.

Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/0adcb15b9e0dc7c83d2375ff5f56a10359799fc4

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Citations in the corpus

MeV-scale reheating temperature and thermalization of oscillating neutrinos by radiative and hadronic decays of massive particles (2019, background): “[4] and [5] where they obtained a lower bound TRH > 2 MeV (95% C.”
Freeze-In dark matter with displaced signatures at colliders (2015, background): “It is commonly assumed that TR is very high, many orders of magnitude above the TeV scale, but observationally the most stringent constraints are from the effective number of neutrino species from CMB measurements, TR > 4 MeV [1, 2], and from Big Bang Nucleosynthesis [3, 4].”
Neutrino decoupling beyond the Standard Model: CMB constraints on the Dark Matter mass with a fast and precise Neff evaluation (2018, background): “Such errors have also been reported in footnote 4 of [48].”