12 papers
The pseudospectrum for gravitational perturbations in Kerr spacetimes
Hongsheng Zhang, Zong-Kuan Guo, Rong-Gen Cai
We study the pseudospectrum of the Kerr black hole for gravitational perturbations with spin weight , the case of greatest interest in gravitational-wave astronomy. In the hyp…
Poisson spot and wave scattering of scalar fields by conformal anomaly black holes: probing the near-horizon geometry
Zeming Zhuang, Hongsheng Zhang, Zong-Kuan Guo +1
We investigate the scattering and diffraction of scalar plane waves by static conformal anomaly black holes. We determine the truncation requirements for the partial-wave series (P…
Second-order multipole response of two nearby incoherent sources in wave-optical imaging of a Schwarzschild black hole
Wenfu Cao, Hongsheng Zhang, Zong-Kuan Guo +1
We study wave-optical imaging of two nearby, mutually incoherent point sources by a Schwarzschild black hole. Using the spherical-harmonic addition theorem, we construct partial-wa…
On the Extended Kerr-Newman-Bertotti-Robinson Spacetime: Two Black Holes and a Naked Singularity in Bertotti-Robinson Universe
Yu-Sen Zhou, Wen-Tao Fu, Li-Ming Cao +1
We introduce new coordinates that extend the Kerr--Newman--Bertotti--Robinson spacetime consistently with the previous reciprocal continuation. In these coordinates, the two points…
Quasinormal modes of Schwarzschild--AdS black holes with a near-horizon reflective surface
Libo Xie, Liang-Bi Wu, Yu-Sen Zhou +3
We investigate the scalar quasinormal mode (QNM) spectrum of Schwarzschild-AdS black holes with a partially reflective surface placed near the event horizon. The corresponding QNM…
Symmetry preservation in black hole quasinormal mode spectra
Han-Wen Hu, Chen Lan, Zong-Kuan Guo +1
We establish a general relation between symmetries of gravitational theories and black hole (BH) quasinormal mode (QNM) spectra. We show that a symmetry implies isospectrality when…
Global structure and stability of Kerr-Bertotti-Robinson spacetime
Yu-Sen Zhou, Liang-Bi Wu, Ming-Fei Ji +3
The surface of the Kerr-Bertotti-Robinson spacetime is not a genuine boundary. We construct its natural analytic extension and show that of one KBR region is…
Notes on Kerr-Bertotti-Robinson Spacetime
Yu-Sen Zhou, Liang-Bi Wu, Ming-Fei Ji +3
The surface of the Kerr--Bertotti--Robinson (KBR) spacetime is not the collection of the endpoints of infinitely extended light rays, and the Coulomb type component of g…
Waveform stability for the piecewise step approximation of Regge-Wheeler potential
Liang-Bi Wu, Libo Xie, Yu-Sen Zhou +2
By interpreting the difference between the original Regge-Wheeler potential and its piecewise step approximation as perturbative effects induced by the external environment of the…
The pseudospectrum for the Kerr black hole with spin case
Rong-Gen Cai, Li-Ming Cao, Jia-Ning Chen +3
We investigate the pseudospectrum of the Kerr black hole, which indicates the instability of the spectrum of quasinormal modes (QNMs) of the Kerr black hole. Methodologically, we u…
Geometrical Distances of Extragalactic Binaries through Spectroastrometry
Yu-Yang Songsheng, Jian-Min Wang, Yuan Cao +4
The growing ``Hubble tension'' has prompted the need for precise measurements of cosmological distances. This paper demonstrates a purely geometric approach for determining the dis…
The stability of the greybody factor of Hayward black hole
Liang-Bi Wu, Rong-Gen Cai, Libo Xie
In this study, we investigate the stability of the greybody factor of Hayward black holes by adding a small bump to the effective potential. Since the greybody factor depends on fr…