Joule Thomson expansion of symmergent black holes in extended phase space

@misc{soroushfar2026joule,
  title = {{Joule Thomson expansion of symmergent black holes in extended phase space}},
  author = {Saheb Soroushfar and Sayyed Mehrab Ramezani},
  howpublished = {arXiv},
  year = {2026},
  month = sep,
  doi = {10.48550/arxiv.2609.24400},
  eprint = {2609.24400},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2609.24400},
}

TY  - UNPB
TI  - Joule Thomson expansion of symmergent black holes in extended phase space
AU  - Saheb Soroushfar
AU  - Sayyed Mehrab Ramezani
PY  - 2026
DA  - 2026/09/21
PB  - arXiv
DO  - 10.48550/arxiv.2609.24400
UR  - https://arxiv.org/abs/2609.24400
AB  - We investigate the Joule Thomson expansion of a symmergent black hole within an extended phase-space formalism in which the thermodynamic pressure is introduced as an independent variable. The symmergent entropy contains the parameter alpha-hat, which modifies the enthalpy and thermodynamic volume relative to their standard forms. We show that the Joule Thomson coefficient depends only on the combination 8piP*r_+^2, leading to an inversion curve P_i = (pi/2) * I_i^2 that is independent of alpha-hat. The isenthalpic curves, however, retain a parametric dependence on alpha-hat, indicating that the symmergent sector affects the thermodynamic trajectories but not the inversion boundary itself. The inversion pressure and temperature are derived explicitly, and the cooling regime P > P_i is distinguished from the heating regime P < P_i. Since the effective geometry is asymptotically AdS-like for positive pressure, the results also admit a holographic reading, in which the Joule Thomson expansion corresponds to an isenthalpic process in the dual field theory. The results provide a consistent thermodynamic framework for symmergent black holes and clarify the role of the symmergent parameters in the Joule Thomson process.
ER  -