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 dada. The model provides a good fit even though the expansion history is quite different from the [Lambda]CDM model and the effective equation of state is far from -1. We discuss compatibility (or...

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Veröffentlicht in:	Journal of cosmology and astroparticle physics 2013-09, Vol.2013 (9), p.1-23
Hauptverfasser:	Boehm, Celine, Rasanen, Syksy
Format:	Artikel
Sprache:	eng
Schlagworte:	AMPLITUDES ASTROPHYSICS, COSMOLOGY AND ASTRONOMY Consistency COSMOLOGICAL CONSTANT COSMOLOGY DISTANCE EQUATIONS OF STATE EXPANSION General Relativity and Quantum Cosmology NONLUMINOUS MATTER Physics Signatures Supernovas UNIVERSE
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container_end_page	23
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container_title	Journal of cosmology and astroparticle physics
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creator	Boehm, Celine Rasanen, Syksy
description	We propose a backreaction toy model with realistic features and confront it with the Union2.1 supernova dada. The model provides a good fit even though the expansion history is quite different from the [Lambda]CDM 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.
doi_str_mv	10.1088/1475-7516/2013/09/003
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subjects	AMPLITUDES ASTROPHYSICS, COSMOLOGY AND ASTRONOMY Consistency COSMOLOGICAL CONSTANT COSMOLOGY DISTANCE EQUATIONS OF STATE EXPANSION General Relativity and Quantum Cosmology NONLUMINOUS MATTER Physics Signatures Supernovas UNIVERSE
title	Violation of the FRW consistency condition as a signature of backreaction
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