Cosmological Effects of a Class of Fluid Dark Energy Models

Details Cosmological Effects of a Class of Fluid Dark Energy Models Cosmological Effects of a Class of Fluid Dark Energy Models

2002-11-28

arxiv.org/abs/astro-ph/0211626v1

Phys.Rev. D68 (2003) 103501

Astronomy and Astrophysics

Astrophysics

4 pages, 6 figures

Scientific paper

10.1103/PhysRevD.68.103501

We study the impact of a generalized Chaplygin gas as a candidate for dark energy on CMB anisotropies. The generalized Chaplygin gas is a fluid component with an exotic equation of state, $p = - A/\rho^\alpha$ (a polytropic gas with negative constant and exponent). Such component interpolates in time between dust and a cosmological constant, with an intermediate behaviour as $p=\alpha \rho$. Perturbations of this fluid are stable on small scales, but behave in a very different way with respect to standard quintessence. Moreover, a generalized Chaplygin gas could also represent an archetypal example of a phenomenological unified models of dark energy and dark matter. The results presented here show how the CMB anisotropies induced by this class of models differ from a $\Lambda$CDM model.

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