Exact Thermodynamics and Two-Horizon Relations of Four Rotating Einstein-Maxwell-Maxwell-Dilaton Embeddings
Year: 2026
Type: preprint
Abstract: We establish complete outer-horizon thermodynamics for four exact rotating embeddings of Kerr--Newman and Kaluza--Klein seeds in four-dimensional, asymptotically flat Einstein--Maxwell--Maxwell--dilaton theory without a scalar potential. Constant-coefficient field maps determine the allowed couplings and charge variations. We obtain single-valued mass functions and verify the first law, Smarr relation, and scalar-shift identity on the stated regular branches and finite-area extremal boundaries, including magnetic patch contributions where required. For two distinct regular horizons with positive finite areas, the horizon combinations $2T_\pm S_\pm$ and $S_\pmΩ_\pm/π$ satisfy a common quadratic relation with the long-range-force parameter determined by the asymptotic mass, electromagnetic charges, and scalar charge.
Source: arXiv (Cornell University)
Authors: Huang, Hai, Chen, Juhua
Institutions: Guiyang University, Hunan Normal University
Language: English
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
Awards: G2645374046, G4244114922
OpenAlex ID: W7220676245