70 citations · 260 across the 18 of their papers we have counts for
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Sensitivity of black hole spectral instability to ultraviolet perturbations
Ramin G. Daghigh, Michael D. Green, Guan-Ru Li +3
Black hole quasinormal modes are known to exhibit spectral instability under ultraviolet perturbations of the effective potential. In the present work, we investigate the sensitivi…
On the mapping between bound states and black hole quasinormal modes via analytic continuation: a spectral instability perspective
Guan-Ru Li, Wei-Liang Qian, Xiao-Mei Kuang +5
In this work, we investigate the relation between bound states and quasinormal modes within black hole perturbation theory in the context of spectral instability. Our analysis indi…
Continued fraction method for high overtone quasinormal modes in effective potentials with discontinuity
Guan-Ru Li, Jodin C. Morey, Wei-Liang Qian +4
In this study, we extend Leaver's continued fraction method to evaluate black hole quasinormal modes (QNMs) in systems where the effective potential exhibits a discontinuity. Besid…
On the instability of the fundamental mode of the Regge-Wheeler effective potential
Shui-Fa Shen, Guan-Ru Li, Ramin G. Daghigh +5
It was recently pointed out that the fundamental mode of the Regge-Wheeler effective potential is unstable against an insignificant Gaussian metric perturbation, which, in turn, mi…
Spectral instability in modified Pöschl-Teller effective potential triggered by deterministic and random perturbations
Shui-Fa Shen, Guan-Ru Li, Ramin G. Daghigh +4
Owing to its substantial implications for black hole spectroscopy, spectral instability has attracted considerable attention in the literature. While the emergence of such instabil…
On Hyperboloidal Foliations in the Study of Black Hole Quasinormal Modes
Shui-Fa Shen, Guan-Ru Li, Xiao-Mei Kuang +5
In this work, we demonstrate that the hyperboloidal foliation technique, applied to the study of black hole quasinormal modes, where the spatial boundary is shifted from spacelike…
Asymptotic quasinormal modes, echoes, and black hole spectral instability: a brief review
Shui-Fa Shen, Guan-Ru Li, Ramin G. Daghigh +4
We present a short review of the analytical aspects of recent progress in the study of black hole spectral instability and its potential observational consequences. This topic, ins…
Regge poles, grey body factors, and absorption cross sections for black hole metrics with discontinuity
Guan-Ru Li, Wei-Liang Qian, Qiyuan Pan +3
It was recently proposed by Rosato {\it et al.} and Oshita {\it et al.} that black hole greybody factors, as stable observables at relatively high frequencies, are more relevant qu…
Evolution of black hole echo modes and the causality dilemma
Ramin G. Daghigh, Guan-Ru Li, Wei-Liang Qian +1
It has been shown that black hole quasinormal modes are subject to spectral instability, typically triggered by metric perturbations. These perturbations, which can introduce a min…
On the universality of instability in the fundamental quasinormal modes of black holes
Wei-Liang Qian, Guan-Ru Li, Ramin G. Daghigh +2
We elaborate on a criterion for the emergence of instability in the fundamental mode recently observed by Cheung {\it et al.}, as a universal phenomenon in the context of black hol…
On bifurcation and spectral instability of asymptotic quasinormal modes in the modified Pöschl-Teller effective potential
Guan-Ru Li, Wei-Liang Qian, Ramin G. Daghigh
The Pöchl-Teller effective potential mimics an asymptotically de Sitter black hole bounded by an event horizon and a cosmological one. Owing to the benefit of being analytically so…
Phase transition grade and microstructure of AdS black holes in massive gravity
Guan-Ru Li, Guo-Ping Li, Sen Guo
Considering that under the framework of the massive gravity theory, the interaction between the mass gravitons and Schwarzschild black hole (BH) could make it carry a scalar charge…
Optical appearance of a thin-shell wormhole with a Hayward profile
Sen Guo, Guan-Ru Li, En-Wei Liang
The optical properties of a thin-shell wormhole (TSW) with a Hayward profile is investigated. Adopting the ray-tracing method, we demonstrate that the TSW's contralateral spacetime…
The shadow and photon sphere of the charged black hole in Rastall gravity
Sen Guo, Ke-Jian He, Guan-Ru Li +1
Considering a charged black hole (BH) surrounded by a perfect fluid radiation field (PFRF) in Rastall gravity, we investigate this BH shadow and photon sphere on different spherica…
Shadow thermodynamics of AdS black hole in regular spacetime
Sen Guo, Guan-Ru Li, Guo-Ping Li
The dependence of the black hole (BH) shadow and thermodynamics may be structured in the regular spacetime. Taking the regular Bardeen-AdS BH as an example, the relationship betwee…