EDP Sciences Journals List
Home Document
Subscriber Authentication Point
Issue EAS Publications Series
Volume 36, 2009
Dark Energy and Dark Matter: Observations, Experiments and Theories
Page(s) 17 - 24
DOI 10.1051/eas/0936003
Published online 30 May 2009

Dark Energy and Dark Matter: Observations, Experiments and Theories
E. Pécontal, T. Buchert, Ph. Di Stefano and Y. Copin (eds)
EAS Publications Series, 36 (2009) 17-24
DOI: 10.1051/eas/0936003

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

J.C. Fabris1, S.V.B. Goncalves2, H.E.S. Velten3 and W. Zimdahl4

1  Universidade Federal do Espírito Santo, Departamento de Física, Av. Fernando Ferrari, 514 Campus de Goiabeiras, CEP 29075-910, Vitória, Espírito Santo, Brazil; ; : Institut d'Astrophysique de Paris - IAP, Paris, France
2  Universidade Federal do Espírito Santo, Departamento de Física, Av. Fernando Ferrari, 514, Campus de Goiabeiras, CEP 29075-910, Vitória, Espírito Santo, Brazil; ; : Laboratoire d'Annecy-le-Vieux de Physique Théorique - LAPTH, Annecy-le-Vieux, France
3  Universidade Federal do Espírito Santo, Departamento de Física, Av. Fernando Ferrari, 514, Campus de Goiabeiras, CEP 29075-910, Vitória, Espírito Santo, Brazil;
4  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

Published online: 30 May 2009

Abstract
We model the cosmic medium as the mixture of a generalized Chaplygin gas and a pressureless matter component. Within a neo-Newtonian approach we compute the matter power spectrum. The 2dFGRS data are used to discriminate between unified models of the dark sector and different models, for which there is separate dark matter, in addition to that accounted for by the generalized Chaplygin gas. Leaving the corresponding density parameters free, we find that the unified models are strongly disfavored. On the other hand, using unified model priors, the observational data are also well described, in particular for small and large values of the generalized Chaplygin gas parameter $\alpha$.



© EAS, EDP Sciences 2009


What is OpenURL?

The OpenURL standard is a protocol for transmission of metadata describing the resource that you wish to access. An OpenURL link contains article metadata and directs it to the OpenURL server of your choice. The OpenURL server can provide access to the resource and also offer complementary services (specific search engine, export of references...). The OpenURL link can be generated by different means.
  • If your librarian has set up your subscription with an OpenURL resolver, OpenURL links appear automatically on the abstract pages.
  • You can define your own OpenURL resolver with your EDPS Account. In this case your choice will be given priority over that of your library.
  • You can use an add-on for your browser (Firefox or I.E.) to display OpenURL links on a page (see http://www.openly.com/openurlref/). You should disable this module if you wish to use the OpenURL server that you or your library have defined.