English

Dynamics of gravitating hadron matter in Bianchi-IX cosmological model

General Relativity and Quantum Cosmology 2016-08-31 v2 Cosmology and Nongalactic Astrophysics High Energy Physics - Phenomenology High Energy Physics - Theory

Abstract

We perform an analysis of the Einstein-Skyrme cosmological model in Bianchi-IX background. We analytically describe asymptotic regimes and semi-analytically -- generic regimes. It appears that depending on the product of Newtonian constant κ\kappa with Skyrme coupling KK, in absence of the cosmological term there are three regimes possible -- recollapse with \kK<2\kK < 2 and two power-law regimes -- t1/2\propto t^{1/2} for \kK=2\kK=2 and t\propto t for \kK>2\kK > 2. In presence of the positive cosmological term, power-law regimes turn to exponential (de Sitter) ones while recollapse regime turn to exponential if the value for Λ\Lambda-term is sufficiently large, otherwise the regime remains recollapse. Negative cosmological term leads to the recollapse regardless of \kK\kK. All nonsingular regimes have the squashing coefficient a(t)1a(t) \to 1 at late times, which is associated with restoring symmetry dynamics. Also all nonsingular regimes appear to be linearly stable -- exponential solutions always while power-law for an open region of initial conditions.

Keywords

Cite

@article{arxiv.1607.00536,
  title  = {Dynamics of gravitating hadron matter in Bianchi-IX cosmological model},
  author = {Sergey A. Pavluchenko},
  journal= {arXiv preprint arXiv:1607.00536},
  year   = {2016}
}

Comments

14 pages, 4 figures, Phys Rev D accepted version