Alternatives to Quintessence Model Building
Astrophysics
2009-11-07 v2 General Relativity and Quantum Cosmology
High Energy Physics - Phenomenology
High Energy Physics - Theory
Abstract
We discuss the issue of toy model building for the dark energy component of the universe. Specifically, we consider two generic toy models recently proposed as alternatives to quintessence models, known as Cardassian expansion and the Chaplygin gas. We show that the former is enteriely equivalent to a class of quintessence models. We determine the observational constraints on the latter, coming from recent supernovae results and from the shape of the matter power spectrum. As expected, these restrict the model to a behaviour that closely matches that of a standard cosmological constant .
Keywords
Cite
@article{arxiv.astro-ph/0208528,
title = {Alternatives to Quintessence Model Building},
author = {P. P. Avelino and L. M. G. Beca and J. P. M. de Carvalho and C. J. A. P. Martins and P. Pinto},
journal= {arXiv preprint arXiv:astro-ph/0208528},
year = {2009}
}
Comments
RevTex4; 7 pages, 4 figures. v2: Improved discussion of constraints on Chaplygin gas models. Other clarifications added. Phys Rev. D (in press)