Bulk viscous cosmology

Journal Article · Thu Nov 15 04:00:00 EST 2007 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.76.103516· OSTI ID:21027809

Colistete, R Jr; Fabris, J C; Zimdahl, W ^[1]; Tossa, J ^[2]

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1. Universidade Federal do Espirito Santo, Departamento de Fisica, Av. Fernando Ferrari, 514, Campus de Goiabeiras, CEP 29075-910, Vitoria, Espirito Santo (Brazil)
2. Institut de Mathematiques et de Sciences Physiques-IMSP, Universite d'Abomey-Calavi, BP613, Porto Novo (Benin)

We propose a scenario in which the dark components of the Universe are manifestations of a single bulk viscous fluid. Using dynamical system methods, a qualitative study of the homogeneous, isotropic background scenario is performed in order to determine the phase space of all possible solutions. The specific model which we investigate shares similarities with a generalized Chaplygin gas in the background but is characterized by nonadiabatic pressure perturbations. This model is tested against supernova type Ia and matter power spectrum data. Different from other unified descriptions of dark matter and dark energy, the matter power spectrum is well behaved, i.e., there are no instabilities or oscillations on small perturbation scales. The model is competitive in comparison with the currently most popular proposals for the description of the cosmological dark sector.

• OSTI ID: 21027809
• Journal Information: Physical Review. D, Particles Fields, Journal Name: Physical Review. D, Particles Fields Journal Issue: 10 Vol. 76; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
COMPARATIVE EVALUATIONS
COSMOLOGY
DISTURBANCES
ENERGY SPECTRA
INSTABILITY
MATHEMATICAL SOLUTIONS
NONLUMINOUS MATTER
OSCILLATIONS
PERTURBATION THEORY
PHASE SPACE
SUPERNOVAE
UNIVERSE