期刊
UNIVERSE
卷 9, 期 3, 页码 -出版社
MDPI
DOI: 10.3390/universe9030116
关键词
de Sitter entropy; higher-order derivative gravity; entropy function; Lovelock gravity
A theorem on higher-order derivative theories of gravity is proven, showing that the de Sitter/anti-de Sitter metric is always a solution in any generally covariant theory of gravity. Using this theorem and a general form of entropy function for de Sitter spacetimes, the entropy of de Sitter spacetime in a generally covariant theory of gravity can be calculated without knowing the details of the modified metric. As an example, a general formula for dS entropy in Lovelock gravity is obtained.
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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