Alternatives to Quintessence Model Building

Details Alternatives to Quintessence Model Building Alternatives to Quintessence Model Building

2002-08-29

arxiv.org/abs/astro-ph/0208528v2

Phys.Rev. D67 (2003) 023511

Astronomy and Astrophysics

Astrophysics

RevTex4; 7 pages, 4 figures. v2: Improved discussion of constraints on Chaplygin gas models. Other clarifications added. Phys

Scientific paper

10.1103/PhysRevD.67.023511

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 $\Lambda$.

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