3 papers
gr-qc2026
Global uniqueness of Kerr black hole spin and inclination from a segment of the critical curve
Kenta Hioki
High-resolution observations are expected to probe the photon-ring structure of black hole images. The critical curve is the geometrically defined limiting locus on the observer's…
gr-qc2026
Determining Kerr black hole spin and inclination from a segment of the critical curve in black hole images
Kenta Hioki, Umpei Miyamoto, Tomohiro Harada
We present a method for determining the spin parameter and inclination angle of a non-extremal Kerr black hole from segments of the critical curve identified in black hol…
gr-qc2025
Determining parameters of Kerr-Newman black holes by shadow observation from finite distance and spatial infinity
Kenta Hioki, Umpei Miyamoto
We present a method for determining the physical parameters of a Kerr-Newman black hole through shadow observation. In a system comprising a Kerr-Newman black hole, an observer, an…