Comment on "Quasinormal modes of Schwarzschild anti de Sitter black holes: Electromagnetic and gravitational perturbations"

TL;DR

This paper revisits and corrects previous calculations of quasinormal modes for electromagnetic and gravitational perturbations on Schwarzschild-AdS black holes, providing updated frequencies and analyzing potential issues affecting prior results.

Contribution

It offers corrected quasinormal mode frequencies for Schwarzschild-AdS black holes and discusses sources of previous calculation errors and their implications.

Findings

New quasinormal mode frequencies are provided.

Previous frequencies contained inaccuracies.

Implications for black hole perturbation analysis are discussed.

Abstract

The quasinormal modes of the electromagnetic and gravitational perturbation on Schwarzschild-AdS black hole calculated by Cardoso and Lemos has been revisited. Although the equations of motion are correct some frequencies calculated previously by the authors are not. We present the new values of quasinormal modes and discuss the possible sources of problems and implications on the conclusions presented.