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gr-qc2026
Distorting Kerr Images with Parity-Odd Scalar Hair
Qian Wan, Yehui Hou, Yang Huang +3
We investigate thin-disk imaging of Kerr black holes with synchronized scalar hair, focusing on backreacted parity-odd excited states of a complex scalar field minimally coupled to…
gr-qc2026
Probing Lorentz-violating effects via precession and accretion disk images in a rotating bumblebee spacetime
Qing Ou, Zhen-Bo Wu, Qian Wan +1
We investigate kinematic and optical signatures of Lorentz violation in the strong-field region of a rotating bumblebee spacetime generated by a scalar-gradient bumblebee field. Fo…
gr-qc2025
Probing the Scalar Hair of Rotating Horndeski Black Holes through Thick Disk Images
Qian Wan, Yehui Hou, Minyong Guo
Horizon-scale images of black holes provide a potential probe of fundamental physics, including tests of gravity and black hole hair. To assess the impact of scalar hair on accreti…