3 papers
gr-qc2026
External magnetic-field effects on dipolar-particle orbits and critical collisions in Kerr--Bertotti--Robinson spacetime
Haowei Chen, Hengyu Xu, Shao-Jun Zhang
Strong magnetic fields affect particle dynamics through two distinct channels: gravitational backreaction deforms the spacetime, while direct coupling to an intrinsic magnetic mome…
gr-qc2026
Horizon-Evanescent Scalar Clouds from Coupled Rotation and Magnetic Fields around Black Holes
Hengyu Xu, Haowei Chen, Shao-Jun Zhang
We show that black-hole rotation and an external magnetic field can jointly generate a qualitatively new class of scalar cloud. Using the Kerr-Bertotti-Robinson geometry as a separ…
gr-qc2024
Charged superradiant instability in a spherical regular black hole
Yizhi Zhan, Hengyu Xu, Shao-Jun Zhang
We examine the stability of a spherically symmetric regular black hole when subjected to perturbations from a charged scalar field. This particular black hole is constructed by def…