Talk detail

Participant	Meinel, Reinhard
Institution	University of Jena, Theoretisch-Physikalisches Institut - Max-Wien-Platz 1 - Jena - - Germany

Session	AT3	Accepted		Order	Time
Talk	Oral abstract	Title	Black holes and quasiblack holes in Einstein-Maxwell theory
Co-authors
Abstract	Continuous sequences of asymptotically flat solutions to the Einstein-Maxwell equations describing regular equilibrium configurations of ordinary matter can reach a black hole limit. For a distant observer, the spacetime becomes more and more indistinguishable from the metric of an extremal Kerr-Newman black hole outside the horizon when approaching the limit. From the interior point of view, a still regular but non-asymptotically flat spacetime with the extreme Kerr-Newman near-horizon geometry at spatial infinity forms in the limit. Interesting special cases are sequences of Papapetrou-Majumdar distributions of electrically counterpoised dust leading to extremal Reissner-Nordstrom black holes and sequences of rotating uncharged fluid bodies leading to extremal Kerr black holes.

Session	GT1	Accepted		Order	Time
Talk	Oral abstract	Title	Constructive proof of the Kerr-Newman black hole uniqueness
Co-authors
Abstract	A new proof of the uniqueness of the Kerr-Newman black hole solutions amongst asymptotically flat, stationary and axisymmetric electro-vacuum spacetimes surrounding a connected Killing horizon is given by means of an explicit construction of the corresponding complex Ernst potentials on the axis of symmetry. This construction, which makes use of the inverse scattering method, also works in the case of a degenerate horizon. Reference: R. Meinel, Class. Quantum Grav. 29 (2012) 035004 [arXiv:1108.4854]