Non-Gaussianity and baryonic isocurvature fluctuations in the curvaton scenario

2008/10/31 by Takeo Moroi, Tomo Takahashi · 1 citation
Earth and Planetary Sciences · Physics and Astronomy · #Asymmetry #Baryogenesis #Baryon #Baryon asymmetry #Baryon number #Black Holes and Theoretical Physics #Cosmic microwave background #Cosmology and Gravitation Theories #Geophysics and Gravity Measurements #Inflation (cosmology) #Inflaton #Non-Gaussianity #Particle physics #Physics #Quantum mechanics #Theoretical physics #astro-ph #hep-ph #hep-th

paper · pdf · doi:10.1016/j.physletb.2008.12.034

published as Phys.Lett.B671:339-344,2009 · 14 pages, 3 figures, published version

arxiv created 2008/12/15 · openalex publication_date 2008/12/25 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05

Abstract

We discuss non-Gaussianity and baryonic isocurvature fluctuations in the curvaton scenario, assuming that the baryon asymmetry of the universe originates only from the decay products of the inflaton. When large non-Gaussianity is realized in such a scenario, non-vanishing baryonic isocurvature fluctuations can also be generated unless the baryogenesis occurs after the decay of the curvaton. We calculate the non-linearity parameter f NL and the baryonic isocurvature fluctuations, taking account of the primordial fluctuations of both the inflaton and the curvaton. We show that, although current constraints on isocurvature fluctuations are severe, the non-linearity parameter can be large as f NL ∼ O ( 10 – 100 ) without conflicting with the constraints.

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• On classification of models of large local-type non-Gaussianity