162 citations · 978 across the 47 of their papers we have counts for
47 papers
The critical radius of compressible capillary drops: viscosity, thermodynamics, and diffuse-interface scales
Umpei Miyamoto
A compressible capillary drop differs from an incompressible one in that its radius is a dynamical degree of freedom. When the drop is sufficiently small, this spherical mode can b…
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…
A linear-algebraic formulation of dimensional analysis with constraints
Umpei Miyamoto
Dimensional analysis, especially Buckingham's theorem, reduces the number of variables by rewriting a relation in terms of dimensionless quantities. When variables are tied by…
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…
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…