Parts | Days | Selection | Search | Updates | Downloads | Help
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.