1996/02/29 by A. Ghosh, Amit Ghosh, P. Mitra · 2 citations
Physics and Astronomy · #Black Holes and Theoretical Physics #Cosmology and Gravitation Theories #Relativity and Gravitational Theory #hep-th
paper · pdf · doi:10.1142/s0217732396002903
published as Mod.Phys.Lett. A11 (1996) 2933-2940 · 8 pages, LATEX; it is pointed out that the classical action vanishes
arxiv created 1996/08/02 · openalex publication_date 1996/12/07 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
For extremal charged black holes, the thermodynamic entropy is proportional not to the area but to the mass or charges. This is demonstrated here for dyonic extremal black hole solutions of string theory. It is pointed out that these solutions have zero classical action although the area is nonzero. By combining the general form of the entropy allowed by thermodynamics with recent observations in the literature it is possible to fix the entropy almost completely.