162 citations · 978 across the 47 of their papers we have counts for
25 papers · 1 filter
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…
Escape probability of a photon emitted near the black hole horizon
Kota Ogasawara, Takahisa Igata, Tomohiro Harada +1
We investigate the escape of photons from the vicinity of the horizon to infinity in the Kerr-Newmann black hole spacetime. We assume that a light source is at rest in a locally no…
Escape probability of the super-Penrose process
Kota Ogasawara, Tomohiro Harada, Umpei Miyamoto +1
We consider a head-on collision of two massive particles that move in the equatorial plane of an extremal Kerr black hole, which results in the production of two massless particles…