Constraint on the gravitino mass in hybrid inflation

Kazunori Nakayama, Fuminobu Takahashi, Tsutomu T. Yanagida

Research output: Contribution to journalArticlepeer-review

40 Citations (Scopus)

Abstract

We revisit the F-term hybrid inflation model in supergravity. In particular, we point out that a constant term in the superpotential has significant effects on the inflaton dynamics. It is shown that the hybrid inflation model suffers from several potential problems: tuning of the initial condition, gravitino overproduction and formation of cosmic strings, for both minimal and non-minimal Kähler potentials. These problems can only be avoided in gauge-mediated SUSY breaking models where the gravitino is relatively light and the constant term in the superpotential is not important. Implications on the non-thermal leptogenesis scenario are also described.

Original languageEnglish
Article number010
JournalJournal of Cosmology and Astroparticle Physics
Volume2010
Issue number12
DOIs
Publication statusPublished - 2010 Dec 1
Externally publishedYes

Keywords

  • Inflation
  • Supersymmetry and cosmology

ASJC Scopus subject areas

  • Astronomy and Astrophysics

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