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Title: Spectator field models in light of spectral index after Planck

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.
Authors:
 [1] ;  [2] ;  [3] ;  [4]
  1. Canadian Institute for Theoretical Astrophysics, University of Toronto, 60 St. George Street, Toronto, Ontario M5S 3H8 (Canada)
  2. Department of Physics, Tohoku University, Sendai 980-8578 (Japan)
  3. Department of Physics, Saga University, Saga 840-8502 (Japan)
  4. Department of Physics, Tokyo Institute of Technology, Tokyo 152-8551 (Japan)
Publication Date:
OSTI Identifier:
22282615
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Cosmology and Astroparticle Physics; Journal Volume: 2013; Journal Issue: 10; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; 79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; CHAOS THEORY; ENERGY SPECTRA; INFLATIONARY UNIVERSE; INFLATONS; LIMITING VALUES; POTENTIALS; SCALARS; SCALE INVARIANCE