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Newtonian approach to the matter power spectrum of the generalized chaplygin gas

Published online by Cambridge University Press:  30 May 2009

E. Pécontal ,
T. Buchert ,
Ph. Di Stefano ,
Y. Copin ,
J.C. Fabris ,
S.V.B. Goncalves ,
H.E.S. Velten  and
W. Zimdahl
J.C. Fabris*
Affiliation:
Universidade Federal do Espírito Santo, Departamento de Física, Av. Fernando Ferrari, 514 Campus de Goiabeiras, CEP 29075-910, Vitória, Espírito Santo, Brazil. Present adress: Institut d'Astrophysique de Paris - IAP, Paris, France
S.V.B. Goncalves
Affiliation:
Universidade Federal do Espírito Santo, Departamento de Física, Av. Fernando Ferrari, 514 Campus de Goiabeiras, CEP 29075-910, Vitória, Espírito Santo, Brazil. Present adress: Laboratoire d'Annecy-le-Vieux de Physique Théorique - LAPTH, Annecy-le-Vieux, France
H.E.S. Velten
Affiliation:
Universidade Federal do Espírito Santo, Departamento de Física, Av. Fernando Ferrari, 514 Campus de Goiabeiras, CEP 29075-910, Vitória, Espírito Santo, Brazil.
W. Zimdahl
Affiliation:
Universidade Federal do Espírito Santo, Departamento de Física, Av. Fernando Ferrari, 514 Campus de Goiabeiras, CEP 29075-910, Vitória, Espírito Santo, Brazil.
*
fabris@cce.ufes.br ; sergio.vitorino@pq.cnpq.br ; velten@cce.ufes.br ; zimdahl@thp.uni-koeln.de ;
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Abstract

We model the cosmic medium as the mixture of a generalizedChaplygin gas and a pressureless matter component. Within aneo-Newtonian approach we compute the matter power spectrum. The2dFGRS data are used to discriminate between unified models of thedark sector and different models, for which there is separate darkmatter, in addition to that accounted for by the generalizedChaplygin gas. Leaving the corresponding density parameters free,we find that the unified models are strongly disfavored. On theother hand, using unified model priors, the observational data arealso well described, in particular for small and large values ofthe generalized Chaplygin gas parameter α.

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