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Title: Production of non-gaussianities through a positive spatial curvature bouncing phase

We compute the level of non-gaussianities produced by a cosmological bouncing phase in the minimal non-singular setup that lies within the context of General Relativity when the matter content consists of a simple scalar field with a standard kinetic term. Such a bouncing phase is obtained by requiring that the spatial sections of the background spacetime be positively curved. We restrict attention to the close vicinity of the bounce by Taylor expanding the scale factor a(η), the scalar field φ(η) and the potential V(φ) in powers of the conformal time η around the bounce. We find that possibly large non-gaussianities are generically produced at the bounce itself and also discuss which shapes of non-gaussianities are most likely to be produced.
Authors:
 [1] ;  [2] ;  [3]
  1. Department of Physics, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8551 (Japan)
  2. ACGC, Department of Mathematics and Applied Mathematics, University of Cape Town, Rondebosch 7701 (South Africa)
  3. GRECO, Institut d'Astrophysique de Paris, UMR 7095-CNRS, Université Pierre et Marie Curie-Paris 6, 98bis Boulevard Arago, 75014 Paris (France)
Publication Date:
OSTI Identifier:
22373475
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Cosmology and Astroparticle Physics; Journal Volume: 2014; Journal Issue: 07; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; GENERAL RELATIVITY THEORY; MATTER; POTENTIALS; SCALAR FIELDS; SHAPE; SPACE-TIME; STANDARDS