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

Runqian Ye,Jiachen Zheng,Juhua Chen,Yongjiu Wang

Figure 2. P–v diagram of thermodynamic cycles for the heat engine: (a) the rectangle cycle. Paths $1\to 2$ and $3\to 4$ are isobar. Paths $2\to 3$ and $4\to 1$ are isochoric. (b) The Carnot cycle. Paths $1\to 2$ and $3\to 4$ are isothermal. Paths $2\to 3$ and $4\to 1$ are adiabatic.