Violation of the FRW consistency condition as a signature of backreaction

Journal Article · Sun Sep 01 00:00:00 EDT 2013 · Journal of Cosmology and Astroparticle Physics

DOI:https://doi.org/10.1088/1475-7516/2013/09/003· OSTI ID:22282750

Boehm, Céline ^[1]; Räsänen, Syksy ^[2]

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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)

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.

• OSTI ID: 22282750
• Journal Information: Journal of Cosmology and Astroparticle Physics, Vol. 2013, Issue 09; Other Information: Country of input: International Atomic Energy Agency (IAEA); ISSN 1475-7516
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTROPHYSICS
COSMOLOGY AND ASTRONOMY
AMPLITUDES
COSMOLOGICAL CONSTANT
COSMOLOGY
DISTANCE
EQUATIONS OF STATE
EXPANSION
NONLUMINOUS MATTER
UNIVERSE