The R-axion and non-Gaussianity

Kazunori Nakayama, Fuminobu Takahashi

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

We study cosmological implications of an R-axion, a pseudo Nambu-Goldstone boson associated with spontaneous breaking of an U (1)R symmetry, focusing on its quantum fluctuations generated during inflation. We show that, in the anomaly mediation, the R-axion decays into a pair of gravitinos, which eventually decay into the visible particles producing the neutralino LSP. As a result, the quantum fluctuations of the R-axion are inherited by the cold dark matter isocurvature density perturbation with potentially large non-Gaussianity. The constraints on the inflation scale and the initial misalignment are derived.

Original languageEnglish
Pages (from-to)436-439
Number of pages4
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume679
Issue number5
DOIs
Publication statusPublished - 2009 Sep 7
Externally publishedYes

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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