4 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…
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 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…