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arXiv 1709.04031gr-qchep-th
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挠率存在下的时空热力学

Spacetime thermodynamics in the presence of torsion

Ramit Dey, Stefano Liberati, Daniele Pranzetti

摘要:

Jacobson在1995年证明了爱因斯坦方程可以作为平衡时空热力学的局域本构方程导出。为了理解这种物理描述是否是引力的固有性质,迄今为止已经做了许多尝试,将这种处理推广到更广泛的引力理论。在这里,我们考虑的情况下,爱因斯坦-嘉当理论作为一个原型的理论与非传播扭转。在此过程中,我们研究了挠率存在时Killing视界的性质,建立了Riemann-Cartan时空中的局部因果视界的概念,并导出了这类几何的广义Raychaudhuri方程.然后,从与这些局部因果视界相关的熵开始,我们通过实现克劳修斯方程推导出爱因斯坦-嘉当方程。我们概述了两种方法进行推导取决于我们是否采取扭转作为一个几何场或作为一个物质场。在这两种情况下,我们都需要将内部熵产生项添加到克劳修斯方程中,因为对于我们的设置,剪切和扭曲不能先验地为零。这一事实意味着对局部因果视界进行非平衡热力学处理的必要性。此外,这意味着在视界的非零扭曲将在一般情况下有助于哈特尔-霍金潮汐加热的黑洞与未来的观测可能的影响。

英文摘要:

It was shown by Jacobson in 1995 that the Einstein equation can be derived as a local constitutive equation for an equilibrium spacetime thermodynamics. With the aim to understand if such thermodynamical description is an intrinsic property of gravitation, many attempts have been done so far to generalise this treatment to a broader class of gravitational theories. Here we consider the case of the Einstein-Cartan theory as a prototype of theories with non-propagating torsion. In doing so, we study the properties of Killing horizons in the presence of torsion, establish the notion of local causal horizon in Riemann-Cartan spacetimes, and derive the generalised Raychaudhuri equation for this kind of geometries. Then, starting with the entropy that can be associated to these local causal horizons, we derive the Einstein-Cartan equation by implementing the Clausius equation. We outline two ways of proceeding with the derivation depending on whether we take torsion as a geometric field or as a matter field. In both cases we need to add internal entropy production terms to the Clausius equation as the shear and twist cannot be taken to be zero a priori for our setup. This fact implies the necessity of a non-equilibrium thermodynamics treatment for the local causal horizon. Furthermore, it implies that a non-zero twist at the horizon will in general contribute to the Hartle-Hawking tidal heating for black holes with possible implications for future observations.

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