Gravitino-overproduction problem in an inflationary universe

Masahiro Kawasaki, Fuminobu Takahashi, T. T. Yanagida

研究成果: Article査読

126 被引用数 (Scopus)

抄録

We show that the gravitino-overproduction problem is prevalent among inflation models in supergravity. An inflaton field generically acquires (effective) nonvanishing auxiliary field GΦ(eff), if the Kähler potential is nonminimal. The inflaton field then decays into a pair of the gravitinos. We extensively study the cosmological constraints on GΦ(eff) for a wide range of the gravitino mass. For many inflation models we explicitly estimate GΦ(eff), and show that the gravitino-overproduction problem severely constrains the inflation models, unless such an interaction as K=κ/2| |2z2+H.c. is suppressed (here z is the field responsible for the supersymmetry breaking). We find that many of them are already excluded or on the verge of, if κ∼O(1).

本文言語English
論文番号043519
ジャーナルPhysical Review D - Particles, Fields, Gravitation and Cosmology
74
4
DOI
出版ステータスPublished - 2006
外部発表はい

ASJC Scopus subject areas

  • 核物理学および高エネルギー物理学
  • 物理学および天文学(その他)

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