Kantowski-Sachs universes sourced by a Skyrme fluid
Luca Parisi, Ninfa Radicella, ; Gaetano Vilasi; ASI sponsor
Mar - 2015
DOI: 10.1103/PhysRevD.91.063533

journal : Physical Review D

Volume : 91 ; Issue : 6
type: Article Journal

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 α=π/2 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.

keywords : Cosmology, Kantowski-Sachs, Skyrmions, Dynamical Systems.

Notes : This workis partially supported by Agenzia Spaziale Italiana (ASI)through Contract No. I/034/12/0.