Erlangen 2026 – scientific programme
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GR: Fachverband Gravitation, Relativistische Astrophysik und Kosmologie
GR 9: Black Holes II
GR 9.1: Talk
Wednesday, March 18, 2026, 13:45–14:00, KH 02.012
Gravitational lensing in a warm plasma — Barbora Bezdekova1 and •Volker Perlick2 — 1Department of Physics, Faculty of Natural Sciences, University of Haifa, Haifa 3498838, Israel — 2Faculty 1, Universität Bremen, 28359 Bremen, Germany
We consider gravitational kensing in a warm, non-magnetized electron-ion plasma, thereby extending the rather extensive literature on lensing in a cold plasma. After discussing the general equations for light rays in such a medium on a general-relativistic spacetime, we specify to the axially symmetric and stationary case which includes the spherically symmetric and static case. In particular, we calculate the influence of a warm plasma on the bending angle. In the spherically symmetric and static case, we also calculate the shadow in a warm plasma. We illustrate the general results with a static (respectively corotating) and an infalling warm plasma on Schwarzschild and Kerr spacetimes. A preprint of this work is available at arXiv:2512.09341 .
Keywords: gravitational lensing; black holes; plasma