Shadows and quasinormal modes of a charged non-commutative black hole by different methods

Abstract

In this paper, we calculated the quasinormal modes (QNMs) of a charged non-commutative black hole in scalar, electromagnetic and gravitational fields by three methods. We gave the influence of non-commutative parameter $\theta$ and charge $Q$ on QNMs in different fields. Thereafter, we calculated the shadow radius of the black hole and provided the valid range of $\theta$ and $Q$ using the constraints on the shadow radius of ${\text{M87}}^{\ast }$ and ${\text{Sgr A}}^{\ast }$ from the Event Horizon Telescope (EHT). In addition, we estimated the ``relative deviation'' of the shadow radius (${\delta }_{R_s}$) between non-commutative spacetime and commutative spacetime. We found that the maximum values of ${\delta }_{R_s}$ decreases with the increase of charge $Q$. In other words, the non-commutativity of spacetime becomes harder to distinguish as the charge of the black hole increases.

arXiv comment25 pages, 12 figures

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