QUASILOCAL ENERGY FOR STATIONARY AXISYMMETRIC EMDA BLACK HOLE
Wang Shi-lianga, Jing Ji-liangb
a Physics Department and Institute of Physics, Hunan Normal University, Changsha 410081, China; b Physics Department and Institute of Physics, Hunan Normal University, Changsha 410081, China; Department of Astronomy and Applied Physics, University of Science and Technology of China, Hefei 230026, China
Abstract By using Brown-York quasilocal energy theory we calculate the quasilocal energy of a stationary axisymmetic EMDA black hole and explore the universality of Martinez's conjecture in string theory. We show that the energy is positive and monotonically decreases to the ADM mass at spatial infinity, and the Martinez's conjecture, the Brown-York quasilocal energy at the outer horizon reduces to twice its irreducible mass, is still valid for stationary axisymmetric EMDA black hole. From the result we also find that the Kerr-Sen spacetime keeps up with Martinez's conjecture. This is different from the Bose-Naing result that the quasilocal energy of the Kerr-Sen spacetime does not approach the Martinez's conjecture.
Received: 19 August 2000
Published: 12 June 2005
(Quantum aspects of black holes, evaporation, thermodynamics)