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Open AccessArticle

Dynamical Stability of Bulk Viscous Isotropic and Homogeneous Universe

Department of Mathematics, University of the Punjab, Quaid-e-Azam Campus, Lahore-54590, Pakistan
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Universe 2019, 5(8), 185; https://doi.org/10.3390/universe5080185
Received: 20 July 2019 / Revised: 5 August 2019 / Accepted: 7 August 2019 / Published: 9 August 2019
(This article belongs to the Special Issue Relativistic Astrophysics)
In this paper, we study the phase space portrait of homogeneous and isotropic universe by taking different coupling functions between dark energy models and bulk viscous dark matter. The dimensionless quantities are introduced to establish an autonomous set of equations. To analyze the stability of the cosmos, we evaluate critical points and respective eigenvalues for different dynamical quantities. For bulk viscous matter and radiation in tachyon coupled field, these points show stable evolution when γ δ but accelerated expansion of the universe for δ > 1 9 . The stability of the universe increases for some stationary points which may correspond to the late-time expansion for the coupled phantom field. View Full-Text
Keywords: stability; phase space analysis; bulk viscosity stability; phase space analysis; bulk viscosity
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Sharif, M.; Ama-Tul-Mughani, Q. Dynamical Stability of Bulk Viscous Isotropic and Homogeneous Universe. Universe 2019, 5, 185.

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