405 citations · 2.7k across the 85 of their papers we have counts for
6 papers · 1 filter
Relationship between the CMB, SZ Cluster Counts, and Local Hubble Parameter Measurements in a Simple Void Model
Kiyotomo Ichiki, Chul-Moon Yoo, Masamune Oguri
The discrepancy between the amplitudes of matter fluctuations inferred from Sunyaev-Zel'dovich (SZ) cluster number counts, the primary temperature, and the polarization anisotropie…
Expanding universe with nonlinear gravitational waves
Taishi Ikeda, Chul-Moon Yoo, Yasusada Nambu
We test the validity of Isaacson's formula which states that high frequency and low amplitude gravitational waves behave as a radiation fluid on average. For this purpose, we numer…
Systematic error due to isotropic inhomogeneities
Hiroyuki Negishi, Ken-ichi Nakao, Chul-Moon Yoo +1
Usually the effects of isotropic inhomogeneities are not seriously taken into account in the determination of the cosmological parameters because of Copernican principle whose stat…
Cosmological long-wavelength solutions and primordial black hole formation
Tomohiro Harada, Chul-Moon Yoo, Tomohiro Nakama +1
We construct cosmological long-wavelength solutions without symmetry in general gauge conditions compatible with the long-wavelength scheme. We then specify the relationship among…
Spherical polytropic balls cannot mimic black holes
Hiromi Saida, Atsuhito Fujisawa, Chul-Moon Yoo +1
The so-called black hole shadow is a dark region which is expected to appear in a fine image of optical observation of black holes. It is essentially an absorption cross section of…
Maximum mass of a barotropic spherical star
Atsuhito Fujisawa, Hiromi Saida, Chul-Moon Yoo +1
The ratio of total mass to surface radius of spherical perfect fluid ball has an upper bound, . Buchdahl obtained under the assumptions; non-increasing m…