1201.0880 (Hyeong-Chan Kim)

Evolution of cosmological event horizons in anisotropic universes    [PDF]

Hyeong-Chan Kim

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.

View original: http://arxiv.org/abs/1201.0880