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arXiv 0903.0823hep-thgr-qc
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广义引力理论的爱因斯坦方程与热力学关系式$δQ = T δS$是等价的

The Einstein equations for generalized theories of gravity and the thermodynamic relation $δQ = T δS$ are equivalent

Ram Brustein, Merav Hadad

摘要:

证明了广义引力理论的运动方程与热力学关系式$δQ = T δS$是等价的。我们的证明依赖于扩展以前的参数,使用一个更一般的定义的Noether电荷熵。这样,我们就完成了雅各布森提出的将爱因斯坦方程表示为热力学状态方程的建议的实现。此外,我们还发现,如果物质能量动量张量满足零能条件,则Noether荷熵服从热力学第二定律。我们的结果支持这样一种观点,即宏观尺度上的引力是真空热力学的一种表现。

英文摘要:

We show that the equations of motion of generalized theories of gravity are equivalent to the thermodynamic relation $δQ = T δS$. Our proof relies on extending previous arguments by using a more general definition of the Noether charge entropy. We have thus completed the implementation of Jacobson's proposal to express Einstein's equations as a thermodynamic equation of state. Additionally, we find that the Noether charge entropy obeys the second law of thermodynamics if the matter energy momentum tensor obeys the null energy condition. Our results support the idea that gravitation on a macroscopic scale is a manifestation of the thermodynamics of the vacuum.

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