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arXiv 2003.14275gr-qchep-th
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AdS空间中四维带电Gauss-Bonnet黑洞的扩展热力学和微观结构

Extended thermodynamics and microstructures of four-dimensional charged Gauss-Bonnet black hole in AdS space

Shao-Wen Wei, Yu-Xiao Liu

摘要:

新的四维黑洞解的发现为理解低维Gauss-Bonnet引力提供了新的途径。本文通过研究四维带电AdS黑洞的相变和微观结构,检验了Gauss-Bonnet引力。在扩展相空间中,将宇宙学常数和Gauss-Bonnet耦合参数作为热力学变量,我们发现热力学第一定律和相应的Smarr公式都满足.在正则系综和巨正则系综中,我们观察到了与范德华流体类似的小-大黑洞相变。这种相变也可以出现在中性黑洞系统中。进一步,我们构造了Ruppeiner几何,发现在带电或中性黑洞系统中,高温小黑洞的微结构中,除了吸引相互作用外,排斥相互作用也占主导地位.这与五维中性黑洞中只存在主要吸引相互作用的情形有很大的不同.我们还研究了归一化标量曲率的临界行为.这些结果将对四维Gauss-Bonnet引力的特征性质有新的认识。

英文摘要:

The discovery of new four-dimensional black hole solutions presents a new approach to understand the Gauss-Bonnet gravity in low dimensions. In this paper, we test the Gauss-Bonnet gravity by studying the phase transition and microstructures for the four-dimensional charged AdS black hole. In the extended phase space, where the cosmological constant and the Gauss-Bonnet coupling parameter are treated as thermodynamic variables, we find that the thermodynamic first law and the corresponding Smarr formula are satisfied. Both in the canonical ensemble and grand canonical ensemble, we observe the small-large black hole phase transition, which is similar to the case of the van der Walls fluid. This phase transition can also appear in the neutral black hole system. Furthermore, we construct the Ruppeiner geometry, and find that besides the attractive interaction, the repulsive interaction can also dominate among the microstructures for the small black hole with high temperature in a charged or neutral black hole system. This is quite different from the five-dimensional neutral black hole, for which only dominant attractive interaction can be found. The critical behaviors of the normalized scalar curvature are also examined. These results will shed new light into the characteristic property of four-dimensional Gauss-Bonnet gravity.

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