Generalized Chaplygin Gas Model: Dark Energy - Dark Matter Unification and CMBR Constraints

Details Generalized Chaplygin Gas Model: Dark Energy - Dark Matter Unification and CMBR Constraints Generalized Chaplygin Gas Model: Dark Energy - Dark Matter Unification and CMBR Constraints

2003-05-22

arxiv.org/abs/gr-qc/0305086v1

Gen.Rel.Grav. 35 (2003) 2063-2069

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

9 pages, 2 figures; essay selected for an honorable mention by the Gravity Research Foundation, 2003

Scientific paper

The generalized Chaplygin gas (GCG) model allows for an unified description of the recent accelerated expansion of the Universe and the evolution of energy density perturbations. This dark energy - dark matter unification is achieved through an exotic background fluid whose equation of state is given by $p = - A/\rho^{\alpha}$, where $A$ is a positive constant and $0 < \alpha \le 1$. Stringent constraints on the model parameters can be obtained from recent WMAP and BOOMERanG bounds on the locations of the first few peaks and troughs of the Cosmic Microwave Background Radiation (CMBR) power spectrum as well as SNe Ia data.

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