Asymptotic self-similarity breaking at late times in cosmology

Abstract

We study the late time evolution of a class of exact anisotropic cosmological solutions of Einstein's equations, namely spatially homogeneous cosmologies of Bianchi type VII${}_0$ with a perfect fluid source. We show that, in contrast to models of Bianchi type VII${}_h$ which are asymptotically self-similar at late times, Bianchi VII${}_0$ models undergo a complicated type of self-similarity breaking. This symmetry breaking affects the late time isotropization that occurs in these models in a significant way: if the equation of state parameter $\gamma$ satisfies $\gamma \le 4/3$ the models isotropize as regards the shear but not as regards the Weyl curvature. Indeed these models exhibit a new dynamical feature that we refer to as Weyl curvature dominance: the Weyl curvature dominates the dynamics at late times. By viewing the evolution from a dynamical systems perspective we show that, despite the special nature of the class of models under consideration, this behaviour has implications for more general models.

29 pages

References in corpus (1)

• Mixmaster Behavior in Inhomogeneous Cosmological Spacetimes

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