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Title: Curvaton in large field inflation

We comprehensively explore the quadratic curvaton models in the chaotic inflation. In the light of the BICEP2 result r ≈ 0.2, all model parameters and relevant observables are computed. It is found the curvaton field value is constrained into a narrow range, σ{sub *} = O(10{sup −2}–10{sup −1}) and the running of the spectral index is n{sub s}'∼>−10{sup −3}. We show that if the curvaton is added, the models are heavily degenerated on the n{sub s} - r plane. However, introducing a new plane, the degeneracy can be resolved. To distinguish the curvaton models, precise measurements of not only r but also n{sub s}' and the tensor tilt n{sub T} are required.
Authors:
 [1] ; ;  [2]
  1. Kavli Institute for the Physics and Mathematics of the Universe (Kavli IPMU), TODIAS, University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, 277-8583 (Japan)
  2. Institute for Cosmic Ray Research, University of Tokyo, 5-1-5 Kashiwa-no-Ha, Kashiwa, Chiba, 277-8582 (Japan)
Publication Date:
OSTI Identifier:
22375898
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Cosmology and Astroparticle Physics; Journal Volume: 2014; Journal Issue: 09; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
97 MATHEMATICAL METHODS AND COMPUTING; CHAOS THEORY; COSMOLOGICAL INFLATION; DATA; TENSORS