MSW-resonant fermion mixing during reheating

Tsuneto Kanai*, Shinji Tsujikawa

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)


We study the dynamics of reheating in which an inflaton field couples two flavor fermions through Yukawa-couplings. When two fermions have a mixing term with a constant coupling, we show that the Mikheyev-Smirnov-Wolfenstein (MSW)-type resonance emerges due to a time-dependent background in addition to the standard fermion creation via parametric resonance. This MSW resonance not only alters the number densities of fermions generated by a preheating process but also can lead to the larger energy transfer from the inflaton to fermions. Our mechanism can provide additional source terms for the creation of superheavy fermions which may be relevant for the leptogenesis scenario.

Original languageEnglish
Pages (from-to)289-306
Number of pages18
JournalNuclear Physics B
Issue number1-2
Publication statusPublished - 2003 Oct 20
Externally publishedYes

ASJC Scopus subject areas

  • Nuclear and High Energy Physics


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