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gr-qc2026
Charge-activated birefringence of an Einstein-tensor-coupled vector field on Reissner--Nordström black holes
Mao-Yuan Wan, Chen Wu
We study the propagation of a neutral vector test field non-minimally coupled to the Einstein tensor on a Reissner--Nordström black hole. The interaction vanishes on a vacuum backg…
gr-qc2026
Black hole correspondences of quasi-topological gravity : Shadows, quasinormal modes, graybody factors
Sihao Fan, Chen Wu, Wenjun Guo
Within the framework of quasi-topological gravity, we systematically investigate the correspondences among three classes of observables---the shadow, the quasinormal modes, and the…
gr-qc2026
Polarization-dependent observational signatures of Weyl-coupled photons around a black hole
Mao-Yuan Wan, Chen Wu
A photon coupled non-minimally to the Weyl tensor propagates differently in its two linear polarization states: the vacuum around a black hole becomes a birefringent medium. On a S…