282 citations · 2.7k across the 89 of their papers we have counts for
8 papers · 1 filter
Solving the Inverse Problem with Inhomogeneous Universes
Chul-Moon Yoo, Tomohiro Kai, Ken-ichi Nakao
We construct the Lemaître-Tolman-Bondi (LTB) dust universe whose distance-redshift relation is equivalent to that in the concordance cold dark matter (CDM) cosmological mode…
Magnification Probability Distribution Functions of Standard Candles in a Clumpy Universe
Chul-Moon Yoo, Hideki Ishihara, Ken-ichi Nakao +1
Lensing effects on light rays from point light sources, such like Type Ia supernovae, are simulated in a clumpy universe model. In our universe model, it is assumed that all matter…
Lensing Effects on Gravitational Waves in a Clumpy Universe -Effects of Inhomogeneity on the Distance-Redshift Relation-
Chul-Moon Yoo, Ken-ichi Nakao, Hiroshi Kozaki +1
The distance-redshift relation determined by means of gravitational waves in the clumpy universe is simulated numerically by taking into account the effects of gravitational lensin…
Is dark energy the only solution to the apparent acceleration of the present universe?
Hideo Iguchi, Takashi Nakamura, Ken-ichi Nakao
Even for the observed luminosity distance D_L(z), which suggests the existence of dark energy, we show that an inhomogeneous dust universe solution without dark energy is possible…
Stable Operation of a 300-m Laser Interferometer with Sufficient Sensitivity to Detect Gravitational-Wave Events within our Galaxy
Masaki Ando, the TAMA collaboration
TAMA300, an interferometric gravitational-wave detector with 300-m baseline length, has been developed and operated with sufficient sensitivity to detect gravitational-wave events…
How Do Nonlinear Voids Affect Light Propagation ?
Norimasa Sugiura, Ken-ichi Nakao, Daisuke Ida +2
Propagation of light in a clumpy universe is examined. As an inhomogeneous matter distribution, we take a spherical void surrounded by a dust shell where the ``lost mass'' in the v…
Volume Expansion Rate and The Age of The Universe
Takashi Nakamura, Ken-ichi Nakao, Takeshi Chiba +1
Under four assumptions such that 1) Einstein's theory of gravity is correct, 2) existence of foliation by geodesic slicing, 3) the trace of the extrinsic curvature, , is negativ…
Hubble Parameter in Void Universe
Ken-ichi Nakao, Naoteru Gouda, Takeshi Chiba +3
We investigate the distance-redshift relation in the simple void model. As discussed by Moffat and Tatarski, if the observer stays at the center of the void, the observed Hubble pa…