The generalized second law of thermodynamics in generalized gravity theories
The generalized second law of thermodynamics in generalized gravity theories
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广义引力理论中的广义热力学第二定律
DOI：
10.1088/0264-9381/25/23/235018
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发表时间：
2008-12-07
影响因子：
3.5
通讯作者：
Zhang, Peng-Ming
中科院分区：
文献类型：
--
作者：
Wu, Shao-Feng;Wang, Bin;Zhang, Peng-Ming
我们研究广义引力理论中的广义热力学第二定律（GSL）。我们研究总熵随时间的演化，包括视界熵、非平衡熵产生以及所有物质、场和能量成分的熵。我们推导了保护广义第二定律的普遍条件，并研究了它在不同引力理论中的有效性。在爱因斯坦引力（即使是在有史瓦西黑洞的幻影主导的宇宙中）、洛夫洛克引力和膜世界引力中，我们证明了保持 GSL 的条件总是可以满足的。在f(R)引力和标量-张量引力中，保护GSL的条件也成立，因为温度应该为正，引力总是有吸引力的，有效牛顿常数应该是满足实验范围的近似常数。
We investigate the generalized second law of thermodynamics (GSL) in generalized theories of gravity. We examine the total entropy evolution with time including the horizon entropy, the non-equilibrium entropy production, and the entropy of all matter, field and energy components. We derive a universal condition to protect the generalized second law and study its validity in different gravity theories. In Einstein gravity (even in the phantom-dominated universe with a Schwarzschild black hole), Lovelock gravity and braneworld gravity, we show that the condition to keep the GSL can always be satisfied. In f(R) gravity and scalar–tensor gravity, the condition to protect the GSL can also hold because the temperature should be positive, gravity is always attractive and the effective Newton constant should be an approximate constant satisfying the experimental bounds.