A note on Gauss–Bonnet black holes at criticality

Abstract

Within the extended thermodynamics, we give a comparative study of critical heat engines for Gauss–Bonnet and charged black holes in AdS in five dimensions, in the limit of large Gauss–Bonnet parameter α and charge q, respectively. We show that the approach of efficiency of heat engines to Carnot limit in Gauss–Bonnet black holes is higher(lower) than charged black holes when corresponding parameters are small(large).