4 papers
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…
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…
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…