Thermodynamics of Kerr-Newman-Bertotti-Robinson black holes

@misc{zhang2026thermodynamics,
  title = {{Thermodynamics of Kerr-Newman-Bertotti-Robinson black holes}},
  author = {Zelin Zhang and Zhenyu Zhang and Bin Chen},
  howpublished = {arXiv},
  year = {2026},
  month = sep,
  doi = {10.48550/arxiv.2609.09816},
  eprint = {2609.09816},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2609.09816},
  note = {CC BY 4.0},
}

TY  - UNPB
TI  - Thermodynamics of Kerr-Newman-Bertotti-Robinson black holes
AU  - Zelin Zhang
AU  - Zhenyu Zhang
AU  - Bin Chen
PY  - 2026
DA  - 2026/09/09
PB  - arXiv
DO  - 10.48550/arxiv.2609.09816
UR  - https://arxiv.org/abs/2609.09816
AB  - In this work, we extend the thermodynamic analyses of the neutral and specially charged Kerr-Bertotti-Robinson black holes to the general Kerr-Newman-Bertotti-Robinson family, in which the electric and external-field parameters are independent. Using covariant surface charges and canonical integrability methods, we determine the total angular momentum and the canonical mass. The angular momentum follows analytically from the combined gravitational and electromagnetic surface charges. However, the infinitesimal charge associated with coordinate time translations is not integrable in solution space, so the mass must be associated with a more general symmetry generator. Imposing the canonical integrability conditions on this generator, together with the Kerr-Newman mass as the zero-field boundary condition, selects the Christodoulou-Ruffini mass and determines the associated thermodynamic potentials. The first law and Smarr formula take the same form as the ones in usual Kerr-Newman case, and the two previously studied Kerr-Bertotti-Robinson cases are recovered as special limits.
ER  -