Astronomy and Astrophysics – Astrophysics – General Relativity and Quantum Cosmology
Scientific paper
1997-12-05
Phys.Rev. D57 (1998) 3503-3508
Astronomy and Astrophysics
Astrophysics
General Relativity and Quantum Cosmology
9 pages, REVTeX,2 figures; to be published in Phys.Rev.D
Scientific paper
10.1103/PhysRevD.57.3503
We investigate nature of asymptotically de Sitter space-times containing a black hole. We show that if the matter fields satisfy the dominant energy condition and the cosmic censorship holds in the considering space-time, the area of the cosmological event horizon for an observer approaching a future timelike infinity does not decrease, i.e. the second law is satisfied. We also show under the same conditions that the total area of the black hole and the cosmological event horizon, a quarter of which is the total Bekenstein-Hawking entropy, is less than $12\pi/\Lambda$, where $\Lambda$ is a cosmological constant. Physical implications are also discussed.
Ishibashi Akihiro
Koike Tatsuhiko
Maeda Kengo
Narita Makoto
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