Evolution of cosmological event horizons in anisotropic universes

Details Evolution of cosmological event horizons in anisotropic universes Evolution of cosmological event horizons in anisotropic universes

2012-01-04

arxiv.org/abs/1201.0880v2

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

Minor corrections, 7 pages, 2 figures

Scientific paper

We study the evolution of cosmological event horizons in anisotropic Kasner universes in the presence of a positive cosmological constant by analyzing null geodesics. At later times, the asymptotic form of cosmological horizons is the same spherical surface as the de Sitter horizon. At the early times, however, it has non-spherical shape with its eccentricity decreases with time. The horizon area increases with time respecting the second law of thermodynamics. The initial shape of the cosmological horizon takes the form of a needle or pancake surface depending on the nature of the background spacetimes. We also discuss that the presence of the holographic dark energy will modify significantly the initial evolution of the anisotropic universes.

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