  The extended thermodynamics of static charged AdS black holes in conformal
gravity is analyzed. The $P-V$ criticality of these black holes has some
unusual features. There exists a single critical point with critical
temperature $T_c$ and critical pressure $P_c$. At fixed $T>T_c$ (or at fixed
$P>P_c$), there are two zeroth order phase transition points but no first order
phase transition points. The systems favors large pressure states at constant
$T$, or high temperature states at constant $P$.

General Relativity and Quantum Cosmology;High Energy Physics - Theory