De Sitter Entropy in Higher Derivative Theories of Gravity

被引：0
|
作者：
Gong, An [1 ,2 ]
Liu, Kun [3 ]
Shu, Fu-Wen [1 ,2 ,4 ]
机构：
[1] Nanchang Univ, Dept Phys, Nanchang 330031, Peoples R China
[2] Nanchang Univ, Ctr Relativist Astrophys & High Energy Phys, Nanchang 330031, Peoples R China
[3] Leshan Normal Univ, Coll Math & Phys, Leshan 614000, Peoples R China
[4] Yangzhou Univ, Ctr Gravitat & Cosmol, Yangzhou 225012, Peoples R China
来源：
UNIVERSE | 2023年 / 9卷 / 03期
基金：
中国国家自然科学基金;
关键词：
de Sitter entropy; higher-order derivative gravity; entropy function; Lovelock gravity; BLACK-HOLE ENTROPY; NOETHER CHARGE; THERMODYNAMICS; HORIZONS;
D O I：
10.3390/universe9030116
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
A theorem on higer-order derivative theories of gravity is proved. We find that the de Sitter/anti-de Sitter metric is always a solution of any generally covariant theory of gravity. With this theorem and a general form of entropy function for de Sitter spacetimes, we show how to calculate the entropy of de Sitter spacetime in a generally covariant theory of gravity without knowing the details of the modified metric. As an example, a general formula of dS entropy in Lovelock gravity is obtained.
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页数：10
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