Chaplygin gas with non-adiabatic perturbations

Details Chaplygin gas with non-adiabatic perturbations Chaplygin gas with non-adiabatic perturbations

2006-04-28

arxiv.org/abs/gr-qc/0605001v1

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

Latex file, 10 pages. Submitted to the proceedings of the I Brazilian Workshop on Dark Energy/Matter

Scientific paper

Perturbations in a Chaplygin gas, characterized by an equation of state $p = -A/\rho$, may acquire non-adiabatic contributions if spatial variations of the parameter $A$ are admitted. This feature is shown to be related to a specific internal structure of the Chaplygin gas. We investigate how perturbations of this type modify the adiabatic sound speed. A reduction of the effective sound speed compared with the adiabatic value is expected to suppress oscillations in the matter power spectrum. This text is an abridged version of the following reference: W. Zimdahl and J.C. Fabris, Classical and Quantum Gravity, {\bf 22}, 4311(2005).

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