Berlin 2015 – scientific programme

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GR: Fachverband Gravitation und Relativitätstheorie

GR 18: Black Holes

GR 18.2: Talk

Friday, March 20, 2015, 11:30–11:50, H 2013

Shadows of Black Holes — •Arne Grenzebach, Volker Perlick, and Claus Lämmerzahl — ZARM, Universität Bremen, 28359 Bremen

In this talk I present how to calculate the shadow of a Kerr-Newman-NUT black hole with a cosmological constant analytically. For this, the existence of (unstable) spherical light rays in a region K is essential because these determine the boundary of the shadow. After transformation to celestial coordinates on the observer’s sky, the shadow is viewed via stereographic projection as usual. The observer is located at arbitrary Boyer-Lindquist coordinates outside of the horizon.