282 citations · 2.7k across the 89 of their papers we have counts for
8 papers · 1 filter
Primordial black hole formation in the matter-dominated phase of the Universe
Tomohiro Harada, Chul-Moon Yoo, Kazunori Kohri +2
We investigate primordial black hole formation in the matter-dominated phase of the Universe, where nonspherical effects in gravitational collapse play a crucial role. This is in c…
Can we remove the systematic error due to isotropic inhomogeneities?
Hiroyuki Negishi, Ken-ichi Nakao
Usually, we assume that there is no inhomogeneity isotropic in terms of our location in our uni- verse. This assumption has not been observationally confirmed yet in sufficient acc…
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…
Comparison of two approximation schemes for solving perturbations in a LTB cosmological model
Ryusuke Nishikawa, Ken-ichi Nakao, Chul-Moon Yoo
Recently, the present authors studied perturbations in the Lemaitre-Tolman-Bondi cosmological model by applying the second-order perturbation theory in the dust Friedmann-Lemaitre-…
Two-point correlation function of density perturbations in a large void universe
Ryusuke Nishikawa, Chul-Moon Yoo, Ken-ichi Nakao
We study the two-point correlation function of density perturbations in a spherically symmetric void universe model which does not employ the Copernican principle. First we solve p…
Evolution of density perturbations in large void universe
Ryusuke Nishikawa, Chul-Moon Yoo, Ken-ichi Nakao
We study the evolution of linear density perturbations in a large spherical void universe which accounts for the acceleration of the cosmic volume expansion without introducing dar…
Redshift Drift in LTB Void Universes
Chul-Moon Yoo, Tomohiro Kai, Ken-ichi Nakao
We study the redshift drift, i.e., the time derivative of the cosmological redshift in the Lemaître-Tolman-Bondi (LTB) solution in which the observer is assumed to be located at th…
CMB observations in LTB universes: Part II: the kSZ effect in an LTB universe
Chul-Moon Yoo, Ken-ichi Nakao, Misao Sasaki
We study the kinematic Sunyaev-Zel'dovich (kSZ) effect in a Lemître-Tolman-Bondi (LTB) universe model whose distance-redshift relation agrees with that of the concordance CDM mo…