Density perturbations in an Universe dominated by the Chaplygin gas

Brazil); J.C. Fabris; P.E. de Souza (Universidade Federal do Espirito Santo; S.V.B. Goncalves

Density perturbations in an Universe dominated by the Chaplygin gas

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arxiv gr-qc/0103083 v1 pith:3QYDGDEZ submitted 2001-03-22 gr-qc

Density perturbations in an Universe dominated by the Chaplygin gas

J.C. Fabris , S.V.B. Goncalves , P.E. de Souza (Universidade Federal do Espirito Santo , Brazil) This is my paper

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We study the fate of density perturbations in an Universe dominate by the Chaplygin gas, which exhibit negative pressure. We show that it is possible to obtain the value for the density contrast observed in large scale structure of the Universe by fixing a free parameter in the equation of state of this gas. The negative character of pressure must be significant only very recently.

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A generalized Chaplygin-type solid unifies dark matter and dark energy via an early pressureless phase transitioning to a late solid phase that supports acceleration and produces distinct low-redshift perturbation signatures.