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- W3105042695 abstract "In this paper we extend the range of consistency of a constant bulk viscosity model to redshifts up to $zsim 8.1$. In this model the dark sector of the cosmic substratum is a viscous fluid with pressure $p= -zeta theta$, where $theta$ is the fluid-expansion scalar and $zeta$ is the coefficient of bulk viscosity. Using the sample of 59 high-redshift GRBs reported by Wei (2010), we calibrate GRBs at low redshifts with the Union 2 sample of SNe Ia, avoiding then the circularity problem. Testing the constant bulk viscosity model with GRBs we found the best fit for the viscosity parameter $tilde{zeta}$ in the range $0<tilde{zeta}<3$, being so consistent with previous probes; we also determined the deceleration parameter $q_0$ and the redshift of transition to accelerated expansion. Besides we present an updated analysis of the model with CMB5-year data and CMB7-year data, as well as with the baryon acoustic peak BAO. From the statistics with CMB it turns out that the model does not describe in a feasible way the far far epoch of recombination of the universe, but is in very good concordance for epochs as far as $zsim 8.1$ till present." @default.
- W3105042695 created "2020-11-23" @default.
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- W3105042695 date "2011-08-24" @default.
- W3105042695 modified "2023-09-25" @default.
- W3105042695 title "Probing bulk viscous matter-dominated models with gamma-ray bursts" @default.
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- W3105042695 doi "https://doi.org/10.1088/1475-7516/2011/08/023" @default.
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