Kantowski-Sachs Universes sourced by a Skyrme fluid
Luca Parisi, Ninfa Radicella, Gaetano Vilasi
TL;DR
This paper analyzes Kantowski-Sachs cosmological models influenced by a Skyrme field and cosmological constant, revealing behaviors like isotropization, bounce, and recollapse through dynamical systems analysis.
Contribution
It introduces a novel approach by modeling the Skyrme field as an anisotropic fluid within Kantowski-Sachs universes and analyzes their dynamics.
Findings
The Skyrme field acts as an anisotropic fluid in Einstein equations.
The model exhibits isotropization, bounce, and recollapse behaviors.
Dynamical system analysis provides insights into the cosmological evolution.
Abstract
The Kantowski-Sachs cosmological model sourced by a Skyrme field and a cosmological constant is considered in the framework of General Relativity. Assuming a constant radial profile function for the hedgehog ansatz, the Skyrme contribution to Einstein equations is shown to be equivalent to an anisotropic fluid. Using dynamical system techniques, a qualitative analysis of the cosmological equations is presented. Physically interesting features of the model such as isotropization, bounce and recollapse are discussed.
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