I’ve a train to catch and so I did not have time to think of a better title. Sorry. Anyway, for those of you who follow the more technical side of what I do, above is a screen shot to the abstract of a paper to appear tomorrow/today on the arXiv. I’ll try to find some time to say more about it, but I can’t promise anything since I’ve got to finish writing another paper today (on the train ride), and then turn myself away from all this for a little while to work on some other things. The abstract should be reasonably clear though (yes, it is more fun with those gravitational heat engines, in an interesting direction):
The extended thermodynamic properties of the Taub–Bolt–AdS spacetime in four dimensions are similar to those of the Schwarzschild–AdS black hole, and in a high temperature expansion they begin to deviate only at relatively high subleading orders. By analogy with what has been done for black holes, Taub–Bolt’s thermodynamic equations are used to define holographic heat engines, the first examples of gravitational heat engines defined using a spacetime that is not a black hole. The Taub–Bolt engine efficiency is computed for two special kinds of engine cycle and compared to the results for analogous Schwarzschild black hole engine cycles.