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Symposium Schwarze Löcher Hauptvorträge
Hauptvortrag SYSL I Di 14:00 HS 20
Black holes: A physical route to the Kerr metric — •Reinhard
Meinel — Theoretisch-Physikalisches Institut, University of Jena, Max-
Wien-Platz 1, 07743Jena, Germany
As a consequence of Birkhoff’s theorem, the exterior gravitational field
of a spherically symmetric star or black hole is always given by the
Schwarzschild metric. In contrast, the exterior gravitational field of a
rotating (axisymmetric) star differs - in general - from the Kerr metric,
which describes a stationary, rotating black hole. In this talk I discuss the
possibility of a quasi-stationary transition from rotating stars to rotating
black holes.
Hauptvortrag SYSL II Di 14:45 HS 20
Black holes are slippery — •Marek A. Abramowicz —Chalmers
University, Göteborg, Sweden
I discuss some fundamental properties of circular orbits of test particles
around black holes that have not been recognized previously. In
particular, I discuss the direct astrophysical importance of anharmonic
and parametric resonances between radial and polar epicyclic frequencies
in circular motion. I also discuss the behaviour of shear and vorticity in
matter on circular orbits very close to the horizon and show that exact
analytic results imply that the viscous torque between matter and black
hole must vanish, contrary to some recent claims based on an extrapolation
of approximate numerical models. Thus, in the sense of vanishing
viscous torque, black holes are perfectly slippery.
Hauptvortrag SYSL III Di 16:00 HS 20
Gravitational Radiation fromBlack Holes — •Bernard Schutz
— Albert Einstein Institute, Golm
Hauptvorträge
As the first observations with the large interferometric gravitational
wave detectors begin, one of the strongest candidates for the first detection
is the coalescence of two black holes from a binary orbit. It appears
that suitable systems are made relatively abundantly in compact globular
clusters. Their orbital motion radiates strongly during the last few seconds
before coalescence, and the coalescence event may also be a strong
source of radiation. In this talk I will review the status of detectors, the
astrophysical setting for black-hole sources, the efforts – both analytical
and numerical – that are being made to predict the radiation that we
should expect from these systems, and the way in which these predictions
are being used to maximize the likelihood of detecting such an event.
Hauptvortrag SYSL IV Di 16:45 HS 20
Massive Black Holes in Galactic Nuclei — •Reinhard Genzel —
Max-Planck-Institut für extraterrestrische Physik, Garching, Germany
Do massive black holes exist? What is their importance in the Universe?
Ever since the discovery of quasars forty years ago the evidence
for massive black holes in galaxy nuclei has steadily grown. In the past
few years high resolution infrared imaging and spectroscopy have given
compelling evidence for the presence of compact mass concentrations in
the nucleus of the Milky Way as well as a near active galaxy; any configuration
of the central mass other than that of a Black Hole is virtually
excluded. This evidence will be discussed as well as our present understanding
how such black holes have formed and evolved in the early
Universe.