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Title: UV-extending ghost inflation

We present a setup that provides a partial UV-completion of the ghost inflation model up to a scale which can be almost as high as the Planck mass. This is achieved by coupling the inflaton to the Lorentz-violating sector described by the Einstein-aether theory or its khronometric version. Compared to previous works on ghost inflation our setup allows to go beyond the study of small perturbations and include the background dynamics in a unified framework. In the specific regime when the expansion of the Universe is dominated by the kinetic energy of the inflaton we find that the model predicts rather high tensor-to-scalar ratio r ∼ 0.02÷0.2 and non-Gaussianity of equilateral type with f{sub NL} in the range from -50 to -5.
Authors:
 [1] ;  [2]
  1. Faculty of Physics, Moscow State University, Vorobjevy Gory, Moscow, 119991 (Russian Federation)
  2. Theory Group, Physics Department, CERN, Geneva 23, CH-1211 (Switzerland)
Publication Date:
OSTI Identifier:
22373549
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Cosmology and Astroparticle Physics; Journal Volume: 2014; Journal Issue: 05; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; COSMOLOGICAL INFLATION; COUPLING; INFLATIONARY UNIVERSE; KINETIC ENERGY; MASS; PERTURBATION THEORY; SCALARS; TENSORS; UNIVERSE