Non-Gaussianity in multi-field stochastic inflation with the scaling approximation

Takeshi Hattori, Kazuhiro Yamamoto

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

The statistics of multi-field inflation are investigated using the stochastic approach. We analytically obtain the probability distribution function of fields with the scaling approximation by extending the previous work by Amendola. The non-Gaussian nature of the probability distribution function is investigated by decomposing the fields into the adiabatic and isocurvature components. We find that the non-Gaussianity of the isocurvature component can be large compared with that of the adiabatic component. The adiabatic and isocurvature components may be correlated at nonlinear order in the skewness and kurtosis even if uncorrelated at linear level.

Original languageEnglish
Pages (from-to)53-68
Number of pages16
JournalJournal of Cosmology and Astroparticle Physics
Issue number7
DOIs
Publication statusPublished - Jul 1 2005
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics

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