Constraining a matter-dominated cosmological model with bulk viscosity proportional to the Hubble parameter

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dc.creatorAvelino, Arturo
dc.creatorNucamendi, Ulises
dc.date2008-10-01
dc.date.accessioned2026-07-07T12:23:37Z
dc.date.available2026-07-07T12:23:37Z
dc.descriptionWe present and constrain a cosmological model where the only component is a pressureless fluid with bulk viscosity as an explanation for the present accelerated expansion of the universe. We study the particular model of a bulk viscosity coefficient proportional to the Hubble parameter. The model is constrained using the SNe Ia Gold 2006 sample, the Cosmic Microwave Background (CMB) shift parameter R, the Baryon Acoustic Oscillation (BAO) peak A and the Second Law of Thermodynamics (SLT). It was found that this model is in agreement with the SLT using only the SNe Ia test. However when the model is constrained using the three cosmological tests together (SNe+CMB+BAO) we found: 1.- The model violates the SLT, 2.- It predicts a value of H_0 \approx 53 km sec^{-1} Mpc^{-1} for the Hubble constant, and 3.- We obtain a bad fit to data with a χ^2_{min} \approx 532. These results indicate that this model is viable just if the bulk viscosity is triggered in recent times.
dc.description5 pages, 2 eps figures. Work presented in the III International Meeting on Gravitation and Cosmology, Morelia, Mexico, May 26-30, 2008. Submitted to AIP Conference Proceedings of this conference. Related work: arXiv:0801.1686
dc.identifierhttps://arxiv.org/abs/0810.0303
dc.identifierhttp://arxiv.org/abs/0810.0303
dc.identifierAIP Conf.Proc.1083:1-4,2008
dc.identifierdoi:10.1063/1.3058568
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/214050
dc.subjectGeneral Relativity and Quantum Cosmology
dc.subjectAstrophysics
dc.titleConstraining a matter-dominated cosmological model with bulk viscosity proportional to the Hubble parameter
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