Phase transitions in four-dimensional AdS black holes with a nonlinear electrodynamics source

Ramón Bécar,P A González,Joel Saavedra,Yerko Vásquez,Bin Wang

Figure 3. The heat capacity for k = 1, Q = 1, η = 1 and Λ = −0.0246. This figure depicts different regions according to the sign of the heat capacity; (I) CQ < 0 and T < 0 corresponds to the nonphysical region (Non-PH) , (II) T > 0: CQ > 0 SBH region, CQ < 0 MBH region and CQ > 0 LBH region. The second-order phase transitions occur at the points where the heat capacity shows a divergence.