München 2006 – wissenschaftliches Programm
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GR: Gravitation und Relativitätstheorie
GR 201: Einstein-Yang-Mills-Higgs, Skyrmionen und Bosonensterne
GR 201.1: Hauptvortrag
Dienstag, 21. März 2006, 10:30–11:10, K
Surprises with Rotating Black Holes — •Jutta Kunz1, Burkhard Kleihaus1, and Francisco Navarro-Lerida2 — 1Universität Oldenburg — 2Universidad Complutense de Madrid, Spain
In D=4 Einstein-Maxwell theory rotating black holes with regular horizons are uniquely characterized by their global charges. This black hole “no-hair” theorem does not generalize to theories with non-Abelian fields nor to higher dimensions.
In Einstein-Yang-Mills theory rotating hairy black holes arise. These stationary axially symmetric black holes are asymptotically flat, and possess non-trivial non-Abelian electric and magnetic fields outside their regular event horizon.The black holes possess an electric dipole moment. But the rotation can also induce a non-Abelian electric charge. The rotating black hole solutions satisfy a mass formula, similar to the Smarr formula.
In D=4 Einstein-Maxwell-dilaton theory and D=5 Einstein-Maxwell-Chern-Simons (EMCS) theory stationary charged black holes exist, whose horizon angular velocities vanish. Thus their horizon is non-rotating, although their angular momentum is nonzero. The effect of rotation on the horizon is not to make it rotate but to deform it into a squashed sphere. Furthermore, rotating black holes appear, whose horizon can rotate in the opposite sense to their angular momentum. Moreover, in D=5 EMCS theory, black holes with a rotating horizon but vanishing total angular momentum are present, and black holes are no longer uniquely determined by their global charges.