Eur. Phys. J. Plus (2021) 136: 13
https://doi.org/10.1140/epjp/s13360-020-01003-5

Regular Article

The radial Teukolsky equation for Kerr–Newman–de Sitter geometry: revisited

Department of Physics, Mimar Sinan Güzel Sanatlar Üniversitesi, Istanbul, Turkey

^a hortacsu@itu.edu.tr

Received: 18 June 2020
Accepted: 8 December 2020
Published online: 2 January 2021

Abstract

We use Heun-type solutions given in Suzuki et al. (Prog Theor Phys 100:491, 1998) for the radial Teukolsky equation written in the background metric of the Kerr–Newman–de Sitter geometry to calculate reflection coefficient for waves coming from the de Sitter horizon and reflected at the outer horizon of the black hole.