MSW-resonant fermion mixing during reheating

Tsuneto Kanai; Shinji Tsujikawa

doi:10.1016/j.nuclphysb.2003.08.008

MSW-resonant fermion mixing during reheating

Tsuneto Kanai^*, Shinji Tsujikawa

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

1 Citation (Scopus)

Abstract

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 language	English
Pages (from-to)	289-306
Number of pages	18
Journal	Nuclear Physics B
Volume	670
Issue number	1-2
DOIs	https://doi.org/10.1016/j.nuclphysb.2003.08.008
Publication status	Published - 2003 Oct 20
Externally published	Yes

ASJC Scopus subject areas

Nuclear and High Energy Physics

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10.1016/j.nuclphysb.2003.08.008

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title = "MSW-resonant fermion mixing during reheating",

abstract = "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.",

author = "Tsuneto Kanai and Shinji Tsujikawa",

note = "Funding Information: We are grateful to Shin'ichiro Ando, Bruce Bassett, Naofumi Fujishiro, Masahiro Kawasaki, Marco Peloso and Masahide Yamaguchi for useful discussions. S.T. is thankful for financial support from the JSPS (No. 04942).",

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T1 - MSW-resonant fermion mixing during reheating

AU - Kanai, Tsuneto

AU - Tsujikawa, Shinji

N1 - Funding Information: We are grateful to Shin'ichiro Ando, Bruce Bassett, Naofumi Fujishiro, Masahiro Kawasaki, Marco Peloso and Masahide Yamaguchi for useful discussions. S.T. is thankful for financial support from the JSPS (No. 04942).

PY - 2003/10/20

Y1 - 2003/10/20

N2 - 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.

AB - 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.

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DO - 10.1016/j.nuclphysb.2003.08.008

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VL - 670

SP - 289

EP - 306

JO - Nuclear Physics B

JF - Nuclear Physics B

IS - 1-2

ER -

MSW-resonant fermion mixing during reheating

Abstract

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