Accelerated expansion through interaction
Abstract
Interactions between dark matter and dark energy with a given equation of state are known to modify the cosmic dynamics. On the other hand, the strength of these interactions is subject to strong observational constraints. Here we discuss a model in which the transition from decelerated to accelerated expansion of the Universe arises as a pure interaction phenomenon. Various cosmological scenarios that describe a present stage of accelerated expansion, like the LCDM model or a (generalized) Chaplygin gas, follow as special cases for different interaction rates. This unifying view on the homogeneous and isotropic background level is accompanied by a non-adiabatic perturbation dynamics which can be seen as a consequence of a fluctuating interaction rate.
Keywords
Cite
@article{arxiv.0812.2292,
title = {Accelerated expansion through interaction},
author = {Winfried Zimdahl},
journal= {arXiv preprint arXiv:0812.2292},
year = {2015}
}
Comments
4 pages, to appear in the Proceedings of the Spanish Relativity Meeting ERE2008 in Salamanca, September 2008