Bremen 2017 – wissenschaftliches Programm

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GR: Fachverband Gravitation und Relativitätstheorie

GR 1: Schwarze Löcher 1

GR 1.1: Hauptvortrag

Montag, 13. März 2017, 08:30–09:10, SFG 0140

The Shadow of Black Holes. An Analytic Description — •Arne Grenzebach — ZARM, Universität Bremen

Black holes are perhaps the most intriguing objects in Astrophysics. Due to the strong gravity and the resulting deflection of light, the black hole will cast a shadow. I will introduce an analytic geometrical way to construct the black hole's shadow whose shape varies in different space-times. The resulting formulas describe the boundary of the shadow for the general Plebański-Demiański class of stationary, axially symmetric type D solutions of the Einstein-Maxwell equations seen by an observer at arbitrary position. Furthermore, the shadow-plots can be compared with those of a moving observer. An observed image of the shadow would be a strong evidence for the existence of black holes. Thus, the upcoming high-resolution observations of the Galactic center, will reveal whether the center of our Milky Way hosts a black hole.