Matter power spectrum for the generalized Chaplygin gas model: The relativistic case

Journal Article · Thu Apr 15 04:00:00 EDT 2010 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.81.087303· OSTI ID:21415178

Fabris, J C; Velten, H E. S.; Zimdahl, W ^[1]

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1. Departamento de Fisica, Universidade Federal do Espirito Santo, CEP 29060-900 Vitoria, Espirito Santo (Brazil)

The generalized Chaplygin gas model is the prototype of a unified model of dark energy and dark matter (DM). It is characterized by equation-of-state parameters A and {alpha}. We use a statistical analysis of the 2dFGRS data to constrain these parameters. In particular, we find that very small (close to zero) and very large values ({alpha}>>1) of the equation-of-state parameter {alpha} are preferred. To test the validity of this type of unification of the dark sector we admit the existence of a separate DM component in addition to the Chaplygin gas and calculate the probability distribution for the fractional contributions of both components to the total energy density. This analysis favors a model for which the Universe is nearly entirely made up of the separate DM component with an almost negligible Chaplygin gas part. This confirms the results of a previous Newtonian analysis.

• OSTI ID: 21415178
• Journal Information: Physical Review. D, Particles Fields, Journal Name: Physical Review. D, Particles Fields Journal Issue: 8 Vol. 81; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTRONOMY AND ASTROPHYSICS
DISTRIBUTION
ENERGY DENSITY
ENERGY RANGE
EQUATIONS
EQUATIONS OF STATE
MATHEMATICAL MODELS
MATTER
NONLUMINOUS MATTER
NUCLEAR MODELS
PROBABILITY
RELATIVISTIC RANGE
SPECTRA
UNIFIED MODEL
UNIVERSE