2009/05/26 by Tonatiuh Matos, Galaxia Miranda, Ruben Sanchez-Sanchez +2 · 1 citation
Physics and Astronomy · #Black Holes and Theoretical Physics #Cosmology and Gravitation Theories #Dark Matter and Cosmic Phenomena #gr-qc
paper · pdf · doi:10.1103/physrevd.79.124016
published as Phys.Rev.D79:124016,2009 · 12 pages, 2 figures 1 appendix
arxiv created 2009/05/26 · openalex publication_date 2009/06/11 · arxiv updated 2010/04/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We use the harmonic maps ansatz to find exact solutions of the Einstein-Maxwell-dilaton-axion (EMDA) equations. The solutions are harmonic maps invariant to the symplectic real group in four dimensions Sp(4,ℝ)\ensuremath∼O(5). We find solutions of the EMDA field equations for the one- and two-dimensional subspaces of the symplectic group. Specially, for illustration of the method, we find space-times that generalize the Schwarzschild solution with dilaton, axion, and electromagnetic fields.