Cosmological apparent and trapping horizons

Details Cosmological apparent and trapping horizons Cosmological apparent and trapping horizons

2011-06-22

arxiv.org/abs/1106.4427v1

Phys.Rev.D84:024003,2011

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

18 pages, 2 tables, no figures, to appear in Phys. Rev. D

Scientific paper

10.1103/PhysRevD.84.024003

The dynamics of particle, event, and apparent horizons in FLRW space are discussed. The apparent horizon is trapping when the Ricci curvature is positive. This simple criterion coincides with the condition for the Kodama-Hayward apparent horizon temperature to be positive, and also discriminates between timelike and spacelike character of the apparent horizon. We discuss also the entropy of apparent cosmological horizons in extended theories of gravity and we use the generalized 2nd law to discard an exact solution of Brans-Dicke gravity as unphysical.

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