Generalized Chaplygin gas as a scheme for Unification of Dark Energy and Dark Matter

Details Generalized Chaplygin gas as a scheme for Unification of Dark Energy and Dark Matter Generalized Chaplygin gas as a scheme for Unification of Dark Energy and Dark Matter

2002-10-16

arxiv.org/abs/astro-ph/0210375v1

Astronomy and Astrophysics

Astrophysics

4 pages. Talk presented by O.B. at the XVIIIth IAP Colloquium "On the Nature of Dark Energy", Paris, July 2002

Scientific paper

We study the cosmological scenario arising from the dynamics of a generalized Chaplygin gas. The equation of state of the system is given in terms of the energy density, $\rho$, and pressure, $p$, by the relationship $p = - A/\rho^{\alpha}$, where $A$ is a positive constant and $0 < \alpha \le 1$. The conditions under which homogeneity arises are discussed and it is shown that this equation of state describes a universe evolving from a phase dominated by non-relativistic matter to a phase dominated by a cosmological constant via an intermediate period where the effective equation of state is $p = \alpha \rho$.

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