10 papers
Completing the Penrose Process without a Horizon
Yang Huang, Shiyang Hu, Bin Chen +1
In its standard black-hole realization, the Penrose process uses an event horizon to remove a negative-energy fragment. We show that, at the kinematic level, horizon absorption can…
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…
Scalar absorption beyond geometric optics in Klein-Gordon-separable Johannsen black hole spacetimes
Jining Tang, Yang Huang, Hongsheng Zhang
Johannsen metric is a natural and significant generalization of the Kerr metric, representing the most general stationary, axisymmetric spacetime that preserves the Carter constant…
Absorption and scattering of massless scalar waves by Frolov black holes
Jining Tang, Yang Huang, Hongsheng Zhang
We study the absorption and scattering of massless scalar waves by Frolov black holes, a regular deformation of the Reissner--Nordström geometry. A null-geodesic analysis provides…
Dynamics of photons and shadows for black holes haired with parity-odd fields
Yang Huang, Dao-Jun Liu, Hongsheng Zhang
Strong self-gravitational fields enable the realization of macroscopic odd-parity quantum objects. Using ray-tracing methods, we systematically analyze the dynamics of photons and…
Spontaneous genesis of naked singularities through quantum-gravitational processes: conclusive evidence for violation of cosmic censorship
Yang Huang, Hongsheng Zhang
Cosmic censorship conjecture takes a pivotal status in general relativity. We demonstrate that quantum effects, Hawking effect together with Shwinger effect inevitably lead to viol…