Work

Near-horizon geodesic instabilities and anomalous decay of quasinormal modes in Weyl black holes

Year: 2025

Type: article

Abstract: We study the stability of the Weyl geometry considering an exact black hole solution. By calculating the geodesics of massless and massive scalar fields orbiting outside the Weyl black hole background and using the Lyapunov exponent, we show that geodesic instabilities, characterized by the Lyapunov exponent, appear in the asymptotically de Sitter-like spacetime. Calculating the photon sphere's quasinormal modes (QNMs) of a scalar field perturbing the Weyl black hole, we find a relation connecting the QNMs with the Lyapunov exponent in the asymptotically de Sitter-like spacetime. Furthermore, we study the anomalous decay rate of the QNMs connecting their behavior with the Lyapunov exponent.

Source: Physical review. D/Physical review. D.

DOI: 10.1103/ftvr-pclv

Authors: Gerasimos Kouniatalis, P. A. González, Eleftherios Papantonopoulos, Yerko Vásquez

Institutions: National Technical University of Athens, National Observatory of Athens, Universidad Diego Portales, University of La Serena

Language: English

Topic: Black Holes and Theoretical Physics

Subfield: Nuclear and High Energy Physics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: green

OpenAlex ID: W4417268064

FWCI: 1.894

Cites: 49

Cited by: 4

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