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GR: Fachverband Gravitation und Relativitätstheorie

GR 1: Black Holes

GR 1.1: Vortrag

Montag, 20. März 2023, 16:30–16:50, ZEU/0260

Light propagation in a plasma on an axially symmetric and stationary spacetime: Separability of the Hamilton-Jacobi equation and shadow — Barbora Bezděková¹, •Volker Perlick², and Jiří Bičák³ — ¹KIPAC, Stanford University, Stanford, CA 94305, USA — ²ZARM, University of Bremen, Germany — ³Institute of Physics, Charles University, Prague, Cech Republic

We study the effects of a non-magnetised, pressure-less plasma on light rays under the assumption of stationarity and axisymmetry. The necessary and sufficient conditions on the metric and on the plasma frequency are formulated, such that the rays can be analytically determined from a fully separated Hamilton-Jacobi equation. We demonstrate how these results allow to analytically calculate the photon region and the shadow, if they exist. As a special example, a rotating wormhole is considered. - For more details see J. Math. Phys. 63, 092501 (2022).