Quasinormal Modes and Shadows of Black Holes in Infinite Derivative Theory of Gravity

Abstract

In this work, we study the quasinormal modes (QNMs) and shadow of a Schwarzschild black hole (BH) with higher-order metric corrections, in the framework of the Infinite Derivative theory of Gravity (IDG). We study the effects of corrections to the BH's metric, which arises from the IDG's corrections, on the QNMs and shadow of the BH. We used the 6th-order Padé averaged WKB approximation method to study the QNMs of the BH perturbed by a scalar field. The dependence of the amplitude and damping of QNMs with respect to the free parameters has been analysed. It is found that the BH system becomes unstable for some values of the free parameters. We also studied the time evolution of a scalar field around the BH spacetime. The QNMs have also been calculated from the time profile of the evolution, which show good agreement with the values obtained from the WKB method. The variation of the shadow radius of the BH due to the inclusion of higher-order corrections has been studied. Finally, we constrain the free parameters associated with the correction terms using the data from the Keck and VLTI observation, and we obtain some bounds on the parameters.

23 pages, 17 figures

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