Generalized Chaplygin Gas, Accelerated Expansion and Dark Energy-Matter Unification

Details Generalized Chaplygin Gas, Accelerated Expansion and Dark Energy-Matter Unification Generalized Chaplygin Gas, Accelerated Expansion and Dark Energy-Matter Unification

2002-02-18

arxiv.org/abs/gr-qc/0202064v2

Phys.Rev. D66 (2002) 043507

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

5 pages, 4 figures, revtex

Scientific paper

10.1103/PhysRevD.66.043507

We consider the scenario emerging from the dynamics of a generalized $d$-brane in a $(d+1, 1)$ spacetime. The equation of state describing this 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 $0 < \alpha \le 1$. We discuss the conditions under which homogeneity arises and show that this equation of state describes the evolution of 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 given by $p = \alpha \rho$.

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