Evaluating backreaction with the peak model of structure formation
Astrophysics
2009-06-23 v3 General Relativity and Quantum Cosmology
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.
Cite
@article{arxiv.0801.2692,
title = {Evaluating backreaction with the peak model of structure formation},
author = {Syksy Rasanen},
journal= {arXiv preprint arXiv:0801.2692},
year = {2009}
}
Comments
49 pages, 6 figures. v2: Added clarifications and references. v3: Published version. Corrected typos