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arXiv 2004.06498hep-thgr-qc
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扩展相空间中AdS黑洞热力学的几何

Geometry of AdS black hole thermodynamics in extended phase space

Joy Das Bairagya, Kunal Pal, Kuntal Pal, Tapobrata Sarkar

摘要:

我们考虑四维反德西特(AdS)黑洞热力学的几何形状,在扩展的相空间形式主义的状态方程允许明确的比较正常的流体系统。我们表明,对于这里考虑的二维参数流形,标量曲率是成比例的热力学体积。这使我们能够严格审查的适用性几何方法在黑洞热力学扩展相空间。我们展示了如何在正常的流体系统中,预计将举行的几个标准功能施加严格的限制黑洞参数,导致的事实是,在当前文献中的几个结果在扩展相空间的热力学几何可能是物理无效的。这对带电和旋转的AdS黑洞都是正确的。作为我们的分析的副产品,我们研究了一个猜想,关于平等的相关长度的共存阶段附近的临界,在带电的AdS黑洞背景,并找到合理的有效性。

英文摘要:

We consider the geometry of anti-de-Sitter (AdS) black hole thermodynamics in four dimensions, where the equation of state in the extended phase space formalism allows explicit comparison with normal fluid systems. We show that for the two-dimensional parameter manifolds considered here, the scalar curvature is proportional to the thermodynamic volume. This allows us to critically examine the applicability of geometric methods in black hole thermodynamics in extended phase space. We show how several standard features that are expected to hold in normal fluid systems impose severe restrictions on the black hole parameters, leading to the fact that several results in the current literature on the geometry of thermodynamics in extended phase space may be physically invalid. These are true for both charged and rotating AdS black holes. As a by-product of our analysis, we examine a conjecture regarding the equality of the correlation lengths of co-existing phases near criticality, in charged AdS black hole backgrounds, and find reasonable validity.

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