Bayesian analysis of bulk viscous matter dominated universe

Autor: Athira Sasidharan, N. D. Jerin Mohan, Moncy V. John, Titus K. Mathew
Jazyk: angličtina
Rok vydání: 2018
Předmět:
Zdroj: European Physical Journal C: Particles and Fields, Vol 78, Iss 8, Pp 1-9 (2018)
Druh dokumentu: article
ISSN: 1434-6044
1434-6052
DOI: 10.1140/epjc/s10052-018-6105-5
Popis: Abstract In our previous works, we have analyzed the evolution of bulk viscous matter dominated universe with a more general form for bulk viscous coefficient, $$\zeta =\zeta _{0}+\zeta _{1}\frac{\dot{a}}{a}+\zeta _{2}\frac{\ddot{a}}{\dot{a}}$$ ζ=ζ0+ζ1a˙a+ζ2a¨a˙ and also carried out the dynamical system analysis. We found that the model reasonably describes the evolution of the universe if the viscous coefficient is a constant. In the present work we are contrasting this model with the standard $$\varLambda $$ Λ CDM model of the universe using the Bayesian method. We have shown that, even though the viscous model gives a reasonable back ground evolution of the universe, the Bayes factor of the model indicates that, it is not so superior over the $$\varLambda $$ Λ CDM model, but have a slight advantage over it.
Databáze: Directory of Open Access Journals
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