The $Λ{\rm CDM}$ Limit of the Generalized Chaplygin Gas Scenario

Details The $Λ{\rm CDM}$ Limit of the Generalized Chaplygin Gas Scenario The $Λ{\rm CDM}$ Limit of the Generalized Chaplygin Gas Scenario

2003-07-24

arxiv.org/abs/astro-ph/0307427v2

JCAP 0309:002,2003

Astronomy and Astrophysics

Astrophysics

6 pages, to appear in JCAP

Scientific paper

10.1088/1475-7516/2003/09/002

We explicitly demonstrate that, contrary to recent claims, the dynamics of a generalized Chaplygin gas model with an equation of state $p=-C$ (where $C$ is a positive constant) is equivalent to that of a standard $\Lambda$CDM model to first order in the metric perturbations. We further argue that the analogy between the two models goes well beyond linear theory and conclude that they cannot be distinguished based on gravity alone.

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