SMuK 2023 – scientific programme

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GR: Fachverband Gravitation und Relativitätstheorie

GR 5: Classical Relativity

GR 5.1: Talk

Tuesday, March 21, 2023, 17:00–17:20, ZEU/0255

Spinning light source orbiting a compact Schwarzschild object — •Jan-Menno Memmen and Volker Perlick — Zentrum für angewandte Raumfahrttechnik und Mikrogravitation, Bremen, Deutschland

In this talk, we determine the radiation of an extended, spinning light source in circular orbit in the symmetry plane of an stationary, axially symmetric spacetime. The light source is assumed to be a test particle, as to not interfere with the background spacetime. We derive the necessary transformations for a reference frame that is at rest on the surface of the rotating emitter, and link the emission angle on the surface of the emitter to the constants of motion of the light ray. Two emitter geometries are considered; a sphere and a Maclaurin spheroid that is flattened as a result of its spin. In particular, we investigate the influence of the emitter spin on the radiation in a Schwarzschild background. Specifically, the influnece of the spin on the redshift distribution and flux at an arbitrarily positioned observer is studied in detail.