Black hole versus cosmological horizon entropy

Details Black hole versus cosmological horizon entropy Black hole versus cosmological horizon entropy

2003-05-08

arxiv.org/abs/astro-ph/0305121v2

Class.Quant.Grav. 20 (2003) 2753-2764

Astronomy and Astrophysics

Astrophysics

14 pages, including 6 figures, to appear in Classical and Quantum Gravity, reference added

Scientific paper

10.1088/0264-9381/20/13/322

The generalized second law of thermodynamics states that entropy always increases when all event horizons are attributed with an entropy proportional to their area. We test the generalized second law by investigating the change in entropy when dust, radiation and black holes cross a cosmological event horizon. We generalize for flat, open and closed Friedmann-Robertson-Walker universes by using numerical calculations to determine the cosmological horizon evolution. In most cases the loss of entropy from within the cosmological horizon is more than balanced by an increase in cosmological event horizon entropy, maintaining the validity of the generalized second law of thermodynamics. However, an intriguing set of open universe models show an apparent entropy decrease when black holes disappear over the cosmological event horizon. We anticipate that this apparent violation of the generalized second law will disappear when solutions are available for black holes embedded in arbitrary backgrounds.

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