1996/07/31 by Andrew Chamblin, A. Chamblin, G. W. Gibbons · 1 citation
Physics and Astronomy · #Black Holes and Theoretical Physics #Cosmology and Gravitation Theories #Quantum Electrodynamics and Casimir Effect #gr-qc #hep-th
paper · pdf · doi:10.1103/physrevd.55.2177
published as Phys.Rev.D55:2177-2185,1997 · 27 pages LaTeX, minor typos are corrected
arxiv created 1996/08/05 · openalex publication_date 1997/02/15 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We extend the analysis of black hole pair creation to include nonorientable instantons. We classify these instantons in terms of their fundamental symmetries and orientations. Many of these instantons admit the pin structure which corresponds to the fermions actually observed in nature, and so the natural objection that these manifolds do not admit spin structure may not be relevant. Furthermore, we analyze the thermodynamical properties of nonorientable black holes and find that in the nonextreme case there are interesting modifications of the usual formulas for temperature and entropy.