Universal criticality of thermodynamic curvatures for charged AdS black holes

Abstract

In this paper, we analytically study the critical exponents and universal amplitudes of the thermodynamic curvatures such as the intrinsic and extrinsic curvature at the critical point of the small-large black hole phase transition for the charged AdS black holes. At the critical point, it is found that the normalized intrinsic curvature $R_N$ and extrinsic curvature $K_N$ has critical exponents 2 and 1, respectively. Based on them, the universal amplitudes $R_N{t}^2$ and $K_{N}t$ are calculated with the temperature parameter $t=T/T_c-1$ where $T_c$ the critical value of the temperature. Near the critical point, we find that the critical amplitude of $R_N{t}^2$ and $K_{N}t$ is $-\frac{1}{2}$ when $t\to 0^{+}$, whereas $R_N{t}^2\approx -\frac{1}{8}$ and $K_{N}t\approx -\frac{1}{4}$ in the limit $t\to 0^{-}$. These results not only hold for the four dimensional charged AdS black hole, but also for the higher dimensional cases. Therefore, such universal properties will cast new insight into the thermodynamic geometries and black hole phase transitions.

arXiv comment18 pages, 3 figures, 3 tables, Accepted by PRD

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