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Title: Effects of the imaginary inflaton component in supergravity new inflation

When models of new inflation are implemented in supergravity, the inflaton is a complex and not a real scalar field. As a complex scalar field has two independent components, supergravity models of new inflation are naturally two-field models. In this paper, we use the δN formalism to analyse how the two-field behaviour modifies the usual single-field predictions. We find that the model reduces to the single-field limit if the inflaton mass term is sufficiently small. Otherwise, the imaginary inflaton component reduces the amplitude A{sub s} and the spectral index n{sub s} of the scalar curvature perturbations. However, the perturbations remain nearly Gaussian, and the reduced bispectrum f{sub NL} is too small to be observed.
Authors:
 [1]
  1. Department of Physics, University of Basel, Klingelbergstr. 82, CH-4056 Basel (Switzerland)
Publication Date:
OSTI Identifier:
22369926
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Cosmology and Astroparticle Physics; Journal Volume: 2013; Journal Issue: 11; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; AMPLITUDES; INFLATIONARY UNIVERSE; MASS; PERTURBATION THEORY; SCALAR FIELDS; SUPERGRAVITY