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Correspondence between grey-body factors and quasinormal modes for regular black holes with sub-Planckian curvature

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arxiv 2503.21597 v1 pith:JFG5YQYH submitted 2025-03-27 gr-qc

classification gr-qc
keywords blackfactorsgrey-bodyregularholesmethodqnmscompute
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We investigate the quasi-normal modes (QNMs) under the gravitational field perturbations and the grey-body factors for a class of regular black holes with sub-Planckian curvature and Minkowski core. Specifically, we compute the QNMs with the pseudospectral method and the WKB method. It is found that as the deviation parameter of the regular black hole changes, the trajectory of the QNMs displays non-monotonic behavior. Then we compute the grey-body factors with the WKB method and compare them with the results obtained by the correspondence relation recently revealed in [1]. We find the discrepancy exhibits minimor errors, indicating that this relation is effective for computing the grey-body factors of such regular black holes.

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  1. Can we distinguish whether black holes have singularities or not through echoes and light rings?

    gr-qc 2025-05 conditional novelty 5.0 of 10

    In the Bardeen and Hayward black hole families, the singular type II branch can have two light rings and echo-like quasinormal signals, while regular black holes have one light ring.

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