共 21 条
GENERAL 1ST LAW AND THERMODYNAMICS OF HORIZON MATTER SYSTEMS
被引:6
作者:
HAYWARD, G
[1
]
机构:
[1] UNIV ALBERTA,INST THEORET PHYS,EDMONTON T6G 2J1,ALBERTA,CANADA
来源:
PHYSICAL REVIEW D
|
1991年
/
43卷
/
12期
关键词:
D O I:
10.1103/PhysRevD.43.3861
中图分类号:
P1 [天文学];
学科分类号:
0704 ;
摘要:
The first law of thermodynamics is derived for bounded, static, spherically symmetric spacetimes which include a matter distribution and either a black-hole or cosmological horizon. Heat capacities associated with horizon/matter systems are calculated. It is found that if the surface area of the boundary is held fixed, the heat capacity of a system including a black hole can always be made positive by including a matter distribution of sufficient density. The heat capacity associated with a system including a cosmological horizon and a matter distribution may be positive or negative depending on the matter configuration, but must always be negative in the limit that the boundary approaches the horizon. A discussion is given of the case in which the cosmological constant is allowed to vary. It is found that the Hawking-Coleman mechanisms for explaining the low value of the cosmological constant are not well defined.
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页码:3861 / 3872
页数:12
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