Articulo
Hairy AdS black holes with a toroidal horizon in 4D Einstein-nonlinear sigma-model system
PHYSICS LETTERS B
Registro en:
1150246
1150246
Autor
Astorino, Marco
Canfora, Fabrizio
Giacomini-Baumhogger, Alex
Ortaggio, Marcello
Institución
Resumen
An exact hairy asymptotically locally AdS black hole solution with a flat horizon in the Einstein-nonlinear sigma model system in (3+1) dimensions is constructed. The ansatz for the nonlinear SU(2) field is regular everywhere and depends explicitly on Killing coordinates, but in such a way that its energymomentum tensor is compatible with a metric with Killing fields. The solution is characterized by a discrete parameter which has neither topological nor Noether charge associated with it and therefore represents a hair. A U(1) gauge field interacting with Einstein gravity can also be included. The thermodynamics is analyzed. Interestingly, the hairy black hole is always thermodynamically favouredwith respect to the corresponding black hole with vanishing Pionic field. (C) 2017 The Authors. Published by Elsevier B.V. Regular 2015 FONDECYT FONDECYT