Dark viscous fluid described by a unified equation of state in cosmology

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dc.creatorRen, Jie
dc.creatorMeng, Xin-He
dc.date2006-04-30
dc.date2007-04-02
dc.date.accessioned2026-07-07T11:42:31Z
dc.date.available2026-07-07T11:42:31Z
dc.descriptionWe generalize the $Λ$CDM model by introducing a unified EOS to describe the Universe contents modeled as dark viscous fluid, motivated by the fact that a single constant equation of state (EOS) $p=-p_0$ ($p_0>0$) reproduces the $Λ$CDM model exactly. This EOS describes the perfect fluid term, the dissipative effect, and the cosmological constant in a unique framework and the Friedmann equations can be analytically solved. Especially, we find a relation between the EOS parameter and the renormalizable condition of a scalar field. We develop a completely numerical method to perform a $χ^2$ minimization to constrain the parameters in a cosmological model directly from the Friedmann equations, and employ the SNe data with the parameter $\mathcal{A}$ measured from the SDSS data to constrain our model. The result indicates that the dissipative effect is rather small in the late-time Universe.
dc.description4 pages, 2 figures. v2: new materials added. v3: matches the version to appear in IJMPD
dc.identifierhttps://arxiv.org/abs/astro-ph/0605010
dc.identifierhttp://arxiv.org/abs/astro-ph/0605010
dc.identifierInt.J.Mod.Phys.D16:1341-1348,2007
dc.identifierdoi:10.1142/S0218271807010821
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/200913
dc.subjectAstrophysics
dc.titleDark viscous fluid described by a unified equation of state in cosmology
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