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Title: Sub-Planckian two-field inflation consistent with the Lyth bound

The BICEP2 observation of a large tensor-to-scalar ratio, r = 0.20{sup +0.07}{sub -0.05}, implies that the inflaton φ in single-field inflation models must satisfy φ ∼ 10M{sub Pl} in order to produce sufficient inflation. This is a problem if interaction terms suppressed by the Planck scale impose a bound φ ∼< M{sub Pl}. Here we consider whether it is possible to have successful sub-Planckian inflation in the case of two-field inflation. The trajectory in field space cannot be radial if the effective single-field inflaton is to satisfy the Lyth bound. By considering a complex field Φ, we show that a near circular but aperiodic modulation of a |Φ|{sup 4} potential can reproduce the results of φ{sup 2} chaotic inflation for n{sub s} and r while satisfying |Φ| ∼< 0.01 M{sub Pl} throughout. More generally, for models based on a |Φ|{sup 4} potential, the simplest sub-Planckian models are equivalent to φ{sup 2} and φ{sup 4/3} chaotic inflation.
Authors:
 [1]
  1. Department of Physics, University of Lancaster, Lancaster LA1 4YB (United Kingdom)
Publication Date:
OSTI Identifier:
22375880
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:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; 79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; CHAOS THEORY; COSMOLOGICAL INFLATION; INTERACTIONS; MODULATION; POTENTIALS; SCALARS; SPACE; TENSORS; TRAJECTORIES