https://doi.org/10.1140/epjp/s13360-023-03829-1
Regular Article
Qualitative aspects of Kantowski–Sachs cosmologies with cosmological constant and stiff fluid
Centre for Cosmology, Astrophysics and Space Science, GLA University, 281406, Mathura, Uttar Pradesh, India
Received:
12
February
2023
Accepted:
19
February
2023
Published online:
1
March
2023
Homogeneous and anisotropic Kantowski–Sachs model sourced by a stiff fluid and cosmological constant has been explored for different possible scenarios of the universe evolution using dynamical system analysis. The qualitative effects of the inclusion of stiff fluid in model has been investigated. The model yields isotropic universe having de Sitter, quintessence-like or stiff matter-like solutions. In the model, the expanding late-time accelerating universe evolution may be explained by the existence of isotropic, stable attractors. The model also yields synchronous bouncing evolution of the universe in the presence of stiff fluid. The physical viability and consequences of different scenarios such as isotropization, bounce and re-collapse have been discussed in detail.
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© The Author(s), under exclusive licence to Società Italiana di Fisica and Springer-Verlag GmbH Germany, part of Springer Nature 2023. Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law.
