The paper finds that holographic CFT phase transitions at Davies temperature-extremum points are of fractional order 3/2, while those at inflection critical points are of order 4/3, for several AdS black hole models.
Restricted Phase Space Thermodynamics of NED-AdS Black Holes
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abstract
We study the Restricted Phase Space Thermodynamics (RPST) of magnetically charged Anti de Sitter (AdS) black holes sourced by nonlinear electrodynamics(NED). The first law and the corresponding Euler relation are examined using the scaling properties. While the mass is homogeneous in the first order, the intensive variables are observed to follow zeroth order homogeneity. We use numerical and graphical techniques to find the critical points of the various thermodynamic quantities. By utilizing the re-scaling properties of the equation of states, we study the thermodynamic processes using different pairs of variables. From our analysis, we infer that although the RPS thermodynamics of NED-AdS black hole resembles those of RN-AdS, Kerr-AdS, Kerr-Sen-Ads black holes in most of its aspects, hinting at a possible universality, there exists one particular $\mu-C$ process that differs in its behaviour from its counterparts in earlier reported works.
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Holographic Fractional Order Phase Transitions in CFTs Dual to AdS Black Holes
The paper finds that holographic CFT phase transitions at Davies temperature-extremum points are of fractional order 3/2, while those at inflection critical points are of order 4/3, for several AdS black hole models.