Naked singularity in 4D Einstein-Gauss-Bonnet novel gravity: Echoes and instability

Quasinormal Modes in Noncommutative Schwarzschild black holes

“…Such a feature highlights the important role of QNMs in connection with the physics of gravitational waves (GWs). In fact, on one hand GWs allow us to make observations in order to test general relativity (GR) [70][71][72], and on the other hand the predictions of QNMs properties allow us to constrain the gravitational theories beyond GR [73][74][75][76][77][78][79][80][81][82][83][84].…”

Quasinormal Modes of a Charged Black Hole with Scalar Hair

“…It has also been found that the QNM spectrum is unstable under a small perturbation of the potential [46,47]. Furthermore, the QNM frequencies can also partly reveal the stability of the background space-time under small perturbations [48,49]. QNMs play very important roles in other physical systems, for example, leaky resonant cavities [50], and brane world models [51][52][53], which have been widely studied [54][55][56][57][58][59][60][61][62].…”

Quasinormal modes of black holes in f(T) gravity

“…With the developments of the aforementioned theoretical approaches, one can use gravitational-wave observations to test General Relativity, examining for instance the validity of the "no-hair theorem" [77][78][79], and use the predictions of QNM properties to constrain and classify modified gravity theories [80][81][82][83][84][85][86][87][88]. Furthermore, the QNM frequency can also partly reveal the stability of spacetime geometry under small perturbations [89,90]. Hence, the study of QNM has become a concerned topic [91][92][93][94].…”