89 citations · 130 across the 4 of their papers we have counts for
4 papers
Perturbations of Spacetime around a Stationary Rotating Cosmic String
Kouji Ogawa, Hideki Ishihara, Hiroshi Kozaki +1
We consider the metric perturbations around a stationary rotating Nambu-Goto string in Minkowski spacetime. By solving the linearized Einstein equations, we study the effects of az…
Stationary Rotating Strings as Relativistic Particle Mechanics
Kouji Ogawa, Hideki Ishihara, Hiroshi Kozaki +2
Stationary rotating strings can be viewed as geodesic motions in appropriate metrics on a two-dimensional space. We obtain all solutions describing stationary rotating strings in f…
Can inhomogeneties accelerate the cosmic volume expansion?
Tomohiro Kai, Hiroshi Kozaki, Ken-ichi nakao +2
If expanding and contracting regions coexist in the universe, the speed of the cosmic volume expansion can be accelerated. We construct simple inhomogeneous dust-filled universe mo…
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…