73 citations
- Rikkyo UniversityJP7 papers
- National Astronomical Observatory of JapanJP5 papers
- Tohoku UniversityJP4 papers
- National Institute of Information and Communications TechnologyJP3 papers
- Kyoto UniversityJP2 papers
- Kyushu UniversityJP2 papers
- Sumitomo Mitsui Banking CorporationJP2 papers
- Xi'an Jiaotong UniversityCN2 papers
- Advanced Photon Source1 paper
- Argonne National LaboratoryUS1 paper
- Brookhaven National LaboratoryUS1 paper
- Chuo UniversityJP1 paper
48 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…
Resilient quantum electron microscopy
Hiroshi Okamoto
We investigate the fundamental limit of biological quantum electron microscopy, which is designed to go beyond the shot noise limit. Inelastic scattering is expected to be the main…
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…