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Title: Inflation in a two 3-form fields scenario

A setting constituted by N 3-form fields, without any direct interaction between them, minimally coupled to gravity, is introduced in this paper as a framework to study the early evolution of the universe. We focus particularly on the two 3-forms case. An inflationary scenario is found, emerging from the coupling to gravity. More concretely, the fields coupled in this manner exhibit a complex interaction, mediated by the time derivative of the Hubble parameter. Our investigation is supported by means of a suitable choice of potentials, employing numerical methods and analytical approximations. In more detail, the oscillations on the small field limit become correlated, and one field is intertwined with the other. In this type of solution, a varying sound speed is present, together with the generation of isocurvature perturbations. The mentioned features allow to consider an interesting model, to test against observation. It is subsequently shown how our results are consistent with current CMB data (viz.Planck and BICEP2)
Authors:
; ;  [1] ;  [2]
  1. Departamento de Física, Universidade da Beira Interior (UBI), 6200, Covilhã (Portugal)
  2. Faculty of Sciences and Centre for Astronomy and Astrophysics, University of Lisbon, 1749-016 Lisbon (Portugal)
Publication Date:
OSTI Identifier:
22375923
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Cosmology and Astroparticle Physics; Journal Volume: 2014; Journal Issue: 06; 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; 97 MATHEMATICAL METHODS AND COMPUTING; COSMOLOGICAL INFLATION; COUPLING; EVOLUTION; GRAVITATION; INTERACTIONS; MATHEMATICAL SOLUTIONS; OSCILLATIONS; POTENTIALS; SOUND WAVES; UNIVERSE