Joule-Thomson expansion of Einstein-Skyrmion black holes

The Joule-Thomson expansion of Einstein-Skyrmion black holes in four dimensions is studied in the extended phase space. We obtain the inversion curves and the isenthalpic curves for different values of parameters K and λ, which represent the coupling strength between the gravity field and matter field. We find that the parameters K and λ have the same effects during the entire Joule-Thomson expansion and the bigger parameter K or λ corresponds to the smaller inversion pressure. Analogously, the phase space {T, P} consist of cooling-heating regions. In addition, the dispersion point of the Joule-Thomson coefficient µ is in correspondence with the zero point of the Hawking temperature T and the ratio of the minimum inversion temperature Tmini and the critical temperature is a constant.