Chaplygin gas with non-adiabatic pressure perturbations

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

2005-04-19

arxiv.org/abs/gr-qc/0504088v2

Class.Quant.Grav. 22 (2005) 4311-4324

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

16 pages, comments and references added, accepted for publication in Class.Quantum Grav

Scientific paper

10.1088/0264-9381/22/20/011

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 and influence the time dependence of the gravitational potential which gives rise to the Integrated Sachs-Wolfe effect in the anisotropy spectrum of the cosmic microwave background.

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