69 citations · 489 across the 44 of their papers we have counts for
44 papers
Scalar Field Model for Dark Matter Spikes Surrounding Sgr A and M87
Ramin G. Daghigh, Michael D. Green, Gabor Kunstatter
Theoretical models suggest that the adiabatic growth of a black hole immersed in dark matter can lead to the formation of high density regions of dark matter, known as ``spikes'',…
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…
Reflectionless and echo modes in asymmetric Damour-Solodukhin wormholes
Wei-Liang Qian, Qiyuan Pan, Ramin G. Daghigh +2
It is understood that the echo waveforms in ultracompact objects can be regarded as composed mainly of the asymptotic high-overtone quasinormal modes, dubbed echo modes, which pred…