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Title: Violation of the FRW consistency condition as a signature of backreaction

We propose a backreaction toy model with realistic features and confront it with the Union2.1 supernova data. The model provides a good fit even though the expansion history is quite different from the ΛCDM model and the effective equation of state is far from -1. We discuss compatibility (or lack thereof) with other observations. We show that the FRW consistency condition between distance and expansion rate is violated with an amplitude that is slightly below the current observational limits. We expect that this is also the case in the real universe if backreaction is significant, providing a distinct signature of backreaction.
Authors:
 [1] ;  [2]
  1. Institute for Particle Physics Phenomenology, Durham University, South Road, Durham, DH1 3LE (United Kingdom)
  2. Department of Physics, University of Helsinki, and Helsinki Institute of Physics, P.O. Box 64, FIN-00014 Helsinki (Finland)
Publication Date:
OSTI Identifier:
22282750
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Cosmology and Astroparticle Physics; Journal Volume: 2013; Journal Issue: 09; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; AMPLITUDES; COSMOLOGICAL CONSTANT; COSMOLOGY; DISTANCE; EQUATIONS OF STATE; EXPANSION; NONLUMINOUS MATTER; UNIVERSE