457 citations · 637 across the 9 of their papers we have counts for
9 papers
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…
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…
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…
Determining parameters of Kerr black holes at finite distance by shadow observation
Kenta Hioki, Umpei Miyamoto
We propose a new method to determine the physical parameters of Kerr black holes (namely, specific angular momentum , inclination angle , and distance from an observer) o…
Determining parameters of a spherical black hole with a thin accretion disk by observing its shadow
Kenta Hioki, Umpei Miyamoto
We revisit the classic system of a spherically symmetric black hole in general relativity (i.e., a Schwarzschild black hole) surrounded by a geometrically thin accretion disk. Our…
Dynamical Transition from a Naked Singularity to a Black Hole
Kenta Hioki, Tomohiro Harada
We show that a Reissner-Nordström (RN) black hole can be formed by dropping a charged thin dust shell onto a RN naked singularity. This is in contrast to the fact that a RN naked s…