Constraining a double component dark energy model using supernova type Ia data

Autor:	S. V. B. Gonçalves, Jaime F. Villas da Rocha, Júlio C. Fabris, Fabricio Casarejos
Rok vydání:	2007
Předmět:	Physics Equation of state (cosmology) General Physics and Astronomy Big Rip Astrophysics::Cosmology and Extragalactic Astrophysics Astrophysics Parameter space Cosmology General Relativity and Quantum Cosmology Theoretical physics De Sitter universe Barotropic fluid Dark energy Dark fluid
Zdroj:	Physics Letters A. 367:423-430
ISSN:	0375-9601
DOI:	10.1016/j.physleta.2007.03.094
Popis:	A two-component fluid representing dark energy is studied. One of the components has a polytropic form, while the other has a barotropic form. Exact solutions are obtained and the cosmological parameters are constrained using supernova type Ia data. In general, an open universe is predicted. A big rip scenario is largely preferred, but the dispersion in the parameter space is very high. Hence, even if scenarios without future singularities cannot be excluded with the allowed range of parameters, a phantom cosmology, with an open spatial section, is a general prediction of the model. For a wide range of the equation of state parameters there is an asymptotic de Sitter phase.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::571fdaa0b311ffda0c26fedde7c598a4 https://doi.org/10.1016/j.physleta.2007.03.094 Zobrazit plný text záznamu Full Text from ScienceDirect