Anisotropic Segre [(11)(1,1)] dark energy following a particular equation of state

Abstract

A generally anisotropic equation of state originally derived in the context of Newman-Janis rotating systems allows for vacuum energy at a specific density. In this paper we examine the possibility of using that equation of state for cosmological dark energy. We treat the case of large scale ordering of the directions of the energy-momentum tensor eigenvectors with a Bianchi cosmological model, and treat the case where the ordering is random on small scales with an effectively isotropic FLRW system. We find particular spacetimes which evolve towards a vacuum energy/ de Sitter like configuration in either case. In the anisotropic Bianchi case, the system can have behavior reminiscent of big bounce cosmologies, in which the matter content approaches vacuum energy at large scale factor and can behave in a variety of ways at small scale factor. For particular conditions in the effectively isotropic case, we can evolve between true and false vacuum configurations, or between radiation like and vacuum energy configurations. We also show how some simpler equations of state behave under the same assumptions to elucidate the methods for analysis.

Replaced with published version

References in corpus (8)

• Dark energy cosmology: the equivalent description via different theoretical models and cosmography tests
• Anisotropic Dark Energy: Dynamics of Background and Perturbations
• Gravastars supported by nonlinear electrodynamics
• Spinning superconducting electrovacuum soliton
• Black holes can have curly hair
• Anisotropic solid dark energy
• Physical interpretation of Newman-Janis rotating systems. I. A unique family of Kerr-Schild systems
• Extended Newman-Janis algorithm for rotating and Kerr-Newman de Sitter and anti de Sitter metrics