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Scientific article
Open access
English

Evaluating backreaction with the peak model of structure formation

ContributorsRasanen, Syksy
Published inJournal of cosmology and astroparticle physics, vol. 04, no. 026, 45
Publication date2008
Abstract

We evaluate the average expansion rate of a universe which contains a realistic evolving ensemble of non-linear structures. We use the peak model of structure formation to obtain the number density of structures, and take the individual structures to be spherical. The expansion rate increases relative to the FRW value on a timescale of 10-100 billion years, because the universe becomes dominated by fast-expanding voids. However, the increase is not rapid enough to correspond to acceleration. We discuss how to improve our treatment. We also consider various qualitative issues related to backreaction.

Citation (ISO format)
RASANEN, Syksy. Evaluating backreaction with the peak model of structure formation. In: Journal of cosmology and astroparticle physics, 2008, vol. 04, n° 026, p. 45. doi: 10.1088/1475-7516/2008/04/026
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accessLevelPublic
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ISSN of the journal1475-7516
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Creation08/28/2009 1:38:00 PM
First validation08/28/2009 1:38:00 PM
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