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Title: Axion monodromy inflation with multi-natural modulations

We study parameter space in the axion monodromy inflation corrected by dynamically generated terms involving with the axion. The potential has the linear term with multiple sinusoidal functions, which play a role in generating modulations. We show that this potential leads both to a large tensor-to-scalar ratio r{sub T} ∼ 0.16 and to a large negative running of spectral index α{sub s} ∼ - (0.02 -0.03), ameliorating the tension between the result of the PLANCK and that of the BICEP2. To realize these results, a small hierarchy among dynamical scales is required whereas the decay constants in sinusoidal functions remain sub-Planckian in this model. We discuss also reheating process after the inflation in a bottom-up approach.
Authors:
 [1] ; ;  [2] ;  [3]
  1. Theory Center, KEK, 1-1 Oho, Tsukuba, Ibaraki 305-0801 (Japan)
  2. Department of Physics, Hokkaido University, Sapporo 060-0810 (Japan)
  3. Department of Life Science and Technology, Hokkai-Gakuen University, Sapporo 062-8605 (Japan)
Publication Date:
OSTI Identifier:
22375823
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Cosmology and Astroparticle Physics; Journal Volume: 2014; 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; COSMOLOGICAL INFLATION; DECAY; FUNCTIONS; MODULATION; POTENTIALS; SCALARS; SPACE; TENSORS