2007/06/30 by Dumitru Astefanesei, Hossein Yavartanoo · 3 citations
Physics and Astronomy · #Astrophysical Phenomena and Observations #Black Holes and Theoretical Physics #Cosmology and Gravitation Theories #gr-qc #hep-th
paper · pdf · doi:10.1016/j.nuclphysb.2007.10.015
published as Nucl.Phys.B794:13-27,2008 · 18 pages, no figures; V2: minor changes, misprints corrected, expanded references; V4: misprints corrected, expanded references, matches the published version
openalex publication_date 2007/11/14 · arxiv created 2008/05/01 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We investigate the symmetries of the near horizon geometry of extremal stationary black holes in four dimensional Einstein gravity coupled to abelian gauge fields and neutral scalars. Careful consideration of the equations of motion and the boundary conditions at the horizon imply that the near horizon geometry has SO(2,1)× U(1) isometry. This complements the rotating attractors proposal of hep-th/0606244 that had assumed the presence of this isometry. The extremal solutions are classified into two families differentiated by the presence or absence of an ergo-region. We also comment on the attractor mechanism of both branches.