The phase transitions and Joule–Thomson processes of charged de Sitter black holes with cloud of string and quintessence

On the basis of the spatiotemporal equivalent thermodynamic quantity of charged de Sitter black holes with cloud of string and quintessence, the phase transitions and Joule–Thomson processes are studied. The minimum inversion temperature of spacetime is obtained, and the inversion curve and isoenthalpy curve are drawn. As a thermodynamic system, the results show that spacetime also has similar thermodynamic properties to VdW (Van der Waals) system. The effect of spatiotemporal parameters on phase transition is analyzed, which makes us have a deeper understanding of the physical meaning of spatiotemporal parameters. The conclusions will provide some help for people to deeply explore the thermodynamic characteristics of dS spacetime and to understand the basic properties of black hole gravity. That also has a very important value for the establishment of quantum gravity.