Bulk viscous matter-dominated Universes: Asymptotic properties

Arturo Avelino, Ricardo García-Salcedo, Tame Gonzalez, Ulises Nucamendi, Israel Quiros

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

By means of a combined use of the type Ia supernovae and H(z) data tests, together with the study of the asymptotic properties in the equivalent phase space - through the use of the dynamical systems tools - we demonstrate that the bulk viscous matter-dominated scenario is not a good model to explain the accepted cosmological paradigm, at least, under the parametrization of bulk viscosity considered in this paper. The main objection against such scenarios is the absence of conventional radiation and matter-dominated critical points in the phase space of the model. This entails that radiation and matter dominance are not generic solutions of the cosmological equations, so that these stages can be implemented only by means of unique and very specific initial conditions, i. e., of very unstable particular solutions. Such a behavior is in marked contradiction with the accepted cosmological paradigm which requires of an earlier stage dominated by relativistic species, followed by a period of conventional non-relativistic matter domination, during which the cosmic structure we see was formed. Also, we found that the bulk viscosity is positive just until very late times in the cosmic evolution, around z < 1. For earlier epochs it is negative, been in tension with the local second law of thermodynamics. © 2013 IOP Publishing Ltd and Sissa Medialab srl.
Original languageAmerican English
JournalJournal of Cosmology and Astroparticle Physics
DOIs
StatePublished - 1 Aug 2013
Externally publishedYes

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asymptotic properties
universe
Viscosity
Radiation
Dynamical systems
Thermodynamics
viscosity
radiation
dynamical systems
supernovae
critical point
time measurement
thermodynamics
Supernovae

Cite this

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title = "Bulk viscous matter-dominated Universes: Asymptotic properties",
abstract = "By means of a combined use of the type Ia supernovae and H(z) data tests, together with the study of the asymptotic properties in the equivalent phase space - through the use of the dynamical systems tools - we demonstrate that the bulk viscous matter-dominated scenario is not a good model to explain the accepted cosmological paradigm, at least, under the parametrization of bulk viscosity considered in this paper. The main objection against such scenarios is the absence of conventional radiation and matter-dominated critical points in the phase space of the model. This entails that radiation and matter dominance are not generic solutions of the cosmological equations, so that these stages can be implemented only by means of unique and very specific initial conditions, i. e., of very unstable particular solutions. Such a behavior is in marked contradiction with the accepted cosmological paradigm which requires of an earlier stage dominated by relativistic species, followed by a period of conventional non-relativistic matter domination, during which the cosmic structure we see was formed. Also, we found that the bulk viscosity is positive just until very late times in the cosmic evolution, around z < 1. For earlier epochs it is negative, been in tension with the local second law of thermodynamics. {\circledC} 2013 IOP Publishing Ltd and Sissa Medialab srl.",
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Bulk viscous matter-dominated Universes: Asymptotic properties. / Avelino, Arturo; García-Salcedo, Ricardo; Gonzalez, Tame; Nucamendi, Ulises; Quiros, Israel.

In: Journal of Cosmology and Astroparticle Physics, 01.08.2013.

Research output: Contribution to journalArticle

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AU - García-Salcedo, Ricardo

AU - Gonzalez, Tame

AU - Nucamendi, Ulises

AU - Quiros, Israel

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