A general analysis of non-gaussianity from isocurvature perturbations

Masahiro Kawasaki, Kazunori Nakayama, Toyokazu Sekiguchi, Teruaki Suyama, Fuminobu Takahashi

Research output: Contribution to journalArticle

47 Citations (Scopus)

Abstract

Light scalars may be ubiquitous in nature, and their quantum fluctuations can produce large non-Gaussianity in the cosmic microwave background temperature anisotropy. The non-Gaussianity may be accompanied with a small admixture of isocurvature perturbations, which often have correlations with the curvature perturbations. We present a general method to calculate the non-Gaussianity in the adiabatic and isocurvature perturbations with and without correlations, and see how it works in several explicit examples. We also show that they leave distinct signatures on the bispectrum of the cosmic microwave background temperature fluctuations.

Original languageEnglish
Article number042
JournalJournal of Cosmology and Astroparticle Physics
Volume2009
Issue number1
DOIs
Publication statusPublished - 2009 Mar 25
Externally publishedYes

Keywords

  • Cosmological perturbation theory
  • Cosmology of theories beyond the SM
  • Physics of the early universe

ASJC Scopus subject areas

  • Astronomy and Astrophysics

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