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

Kazuhide Ichikawa, Masahiro Kawasaki, Fuminobu Takahashi

Research output: Contribution to journalArticle

126 Citations (Scopus)

Abstract

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 He4 abundance. Also, the effects on the lower bound of the reheating temperature from cosmological observations are discussed.

Original languageEnglish
Article number043522
Pages (from-to)1-11
Number of pages11
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Volume72
Issue number4
DOIs
Publication statusPublished - 2005 Aug 15
Externally publishedYes

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Physics and Astronomy (miscellaneous)

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