Abstract
We consider a Friedmann model of the universe with bulk viscous matter and radiation as the cosmic components. We study the asymptotic properties in the equivalent phase space by considering the three cases for the bulk viscous coefficient as (i) ζ = ζ 0, a constant (ii) \( \zeta ={\zeta}_0+{\zeta}_1\frac{\overset{\cdot }{a}}{a} \), depending on velocity of the expansion of the universe and (iii) \( \zeta ={\zeta}_0+{\zeta}_1\frac{\overset{\cdot }{a}}{a}+{\zeta}_2\frac{\overset{\cdot \cdot }{a}}{\overset{\cdot }{a}} \) , depending both on velocity and acceleration of the expansion of the universe. It is found that all the three cases predicts the late acceleration of the universe. However, a conventional realistic behaviour of the universe, i.e., a universe having an initial radiation dominated phase, followed by decelerated matter dominated phase and then finally evolving to accelerated epoch, is shown only when ζ = ζ 0, a constant. For the other two cases, it does not show either a prior conventional radiation dominated phase or a matter dominated phase of the universe.
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Sasidharan, A., Mathew, T.K. Phase space analysis of bulk viscous matter dominated universe. J. High Energ. Phys. 2016, 138 (2016). https://doi.org/10.1007/JHEP06(2016)138
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DOI: https://doi.org/10.1007/JHEP06(2016)138