Spectator field models in light of spectral index after Planck

Takeshi Kobayashi, Fuminobu Takahashi, Tomo Takahashi, Masahide Yamaguchi

研究成果: Article査読

15 被引用数 (Scopus)


We revisit spectator field models including curvaton and modulated reheating scenarios, specifically focusing on their viability in the new Planck era, based on the derived expression for the spectral index in general spectator field models. Importantly, the recent Planck observations give strong preference to a red-tilted power spectrum, while the spectator field models tend to predict a scale-invariant one. This implies that, during inflation, either (i) the Hubble parameter varies significantly as in chaotic inflation, or (ii) a scalar potential for the spectator field has a relatively large negative curvature. Combined with the tight constraint on the non-Gaussianity, the Planck data provides us with rich implications for various spectator field models.

ジャーナルJournal of Cosmology and Astroparticle Physics
出版ステータスPublished - 2013 10月

ASJC Scopus subject areas

  • 天文学と天体物理学


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