Karlsruhe 2011 – scientific programme
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GR: Fachverband Gravitation und Relativitätstheorie
GR 5: Schwarze Löcher
GR 5.2: Talk
Tuesday, March 29, 2011, 17:05–17:25, 20.40: 101
Stationary Rotating Black Holes in Dilatonic Einstein-Gauss-Bonnet Theory — •Burkhard Kleihaus1, Jutta Kunz1, and Eugen Radu2 — 1University of Oldenburg — 2School of Theoretical Physics - DIAS, Dublin, Ireland
Kerr black holes in Einstein gravity are known in closed form and well studied. String theory on the other hand suggest higher order curvature corrections to pure Einstein gravity. In the simplest four dimensional model the Gauss-Bonnet (GB) term coupled to the dilaton field is added to the Einstein action, leading to the Einstein-Gauss-Bonnet-dilaton (EGBd) theory. Black holes in EGBd theory may possess new qualitative features. In this talk the influence of the GB term on the properties of stationary rotating black holes is addressed. We show that a generalised Smarr relation holds in EGBd theory. Our results indicate that for EGBd black holes the angular momentum can exceed the extremal limit of the Kerr black hole in pure Einstein gravity. We compare the innermost stable circular orbits of EGBd black holes and Kerr black holes.