P–v criticality and heat engine efficiency for Bardeen Einstein–Gauss–Bonnet AdS black hole

Runqian Ye,Jiachen Zheng,Juhua Chen,Yongjiu Wang

Figure 4. Ratio η/ηc between the rectangle cycle efficiency and the Carnot cycle efficiency versus entropy for the Bardeen-EGB-AdS black hole. (a) The case for different e = 0.1, 0.3, 0.4 (from top to bottom) with the Gauss–Bonnet parameter α = 0.1, the pressure P1 = 4, P4 = 1 and the entropy S1 = 1. (b) The case for different α = 0.1, 0.15, 0.2 (from top to bottom) with the Bardeen parameter e = 0.3, the pressure P1 = 4, P4 = 1 and the entropy S1 = 1.