Non-Gaussianity from isocurvature perturbations: Analysis of trispectrum

Etsuko Kawakami, Masahiro Kawasaki, Kazunori Nakayama, Fuminobu Takahashi

研究成果: Article査読

29 被引用数 (Scopus)

抄録

Non-Gaussianity may exist in the CDM isocurvature perturbation. We provide general expressions for the bispectrum and trispectrum of both adiabatic and isocurvature pertubations. We apply our result to the QCD axion case, and found a consistency relation between the coefficients of the bispectrum and trispectrum: τ NL (iso) 10 3[f NL (iso)] 4/3, if the axion is dominantly produced by quantum fluctuation. Thus future observations of the trispectrum, as well as the bispectrum, will be important for understanding the origin of the CDM and baryon asymmetry.

本文言語English
論文番号002
ジャーナルJournal of Cosmology and Astroparticle Physics
2009
9
DOI
出版ステータスPublished - 2009
外部発表はい

ASJC Scopus subject areas

  • Astronomy and Astrophysics

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