Multi-natural inflation in supergravity

Michael Czerny, Tetsutaro Higaki, Fuminobu Takahashi

Research output: Contribution to journalArticlepeer-review

49 Citations (Scopus)

Abstract

We show that the recently proposed multi-natural inflation can be realized within the framework of 4D N = 1 supergravity. The inflaton potential mainly consists of two sinusoidal potentials that are comparable in size, but have different periodicity with a possible non-zero relative phase. For a sub-Planckian decay constant, the multi-natural inflation model is reduced to axion hilltop inflation. We show that, taking into account the effect of the relative phase, the spectral index can be increased to give a better fit to the Planck results, with respect to the hilltop quartic inflation. We also consider a possible UV completion based on a string-inspired model. Interestingly, the Hubble parameter during inflation is necessarily smaller than the gravitino mass, avoiding possible moduli destabilization. Reheating processes as well as non-thermal leptogenesis are also discussed.

Original languageEnglish
Article number144
JournalJournal of High Energy Physics
Volume2014
Issue number5
DOIs
Publication statusPublished - 2014 Jan 1
Externally publishedYes

Keywords

  • Cosmology of Theories beyond the SM
  • Supergravity Models

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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