55 citations
- National Institute of Information and Communications TechnologyJP3 papers
- Tohoku UniversityJP3 papers
- Kyoto UniversityJP2 papers
- National Astronomical Observatory of JapanJP2 papers
- Rikkyo UniversityJP2 papers
- Sumitomo Mitsui Banking CorporationJP2 papers
- Czech Academy of Sciences, Institute of MathematicsCZ1 paper
- Hamamatsu Photonics (Japan)JP1 paper
- Institute of Mathematics and InformaticsBG1 paper
- Kyushu UniversityJP1 paper
- Nanjing Tech UniversityCN1 paper
- Research Institute for Brain and Blood Vessels AkitaJP1 paper
19 papers
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…
Stability of hypersurfaces of constant mean curvature with free boundary in two parallel hyperplanes
Miyuki Koiso, Umpei Miyamoto
Surfaces with constant mean curvature (CMC) are critical points of the area with volume constraint. They serve as a mathematical model of surfaces of soap bubbles and tiny liquid d…
Self-Supervised Pre-Training for Deep Image Prior-Based Robust PET Image Denoising
Yuya Onishi, Fumio Hashimoto, Kibo Ote +2
Deep image prior (DIP) has been successfully applied to positron emission tomography (PET) image restoration, enabling represent implicit prior using only convolutional neural netw…
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…
A distribution-dependent analysis of open-field test movies
Tomokazu Konishi, Haruna Ohrui
Although the open-field test has been widely used, its reliability and compatibility are frequently questioned. Although many indicating parameters were introduced for this test, t…