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Numerical study on the hydrodynamic instability of binary stars in the first post Newtonian approximation of general relativity
Masaru Shibata, Ken-ichi Oohara, Takashi Nakamura
We present numerical results on the hydrodynamic stability of coalescing binary stars in the first post Newtonian(1PN) approximation of general relativity. We pay particular attent…
Gravitational Waves from Coalescing Black Hole MACHO Binaries
Takashi Nakamura, Misao Sasaki, Takahiro Tanaka +1
If MACHOs are black holes of mass about 0.5 solar mass, they must have been formed in the early universe when the temperature was about 1 GeV. We estimate that in this case in our…
Anisotropy of the Cosmic Background Radiation implies the Violation of the Strong Energy Condition in Bianchi type I Universe
Takeshi Chiba, Shinji Mukohyama, Takashi Nakamura
We consider the horizon problem in a homogeneous but anisotropic universe (Bianchi type I). We show that the problem cannot be solved if (1) the matter obeys the strong energy cond…
Cosmology with x-matter
Takeshi Chiba, Naoshi Sugiyama, Takashi Nakamura
Motivated by the possibility of where and are the Hubble parameter and the age of the universe, respectively, we investigate the cosmology including x-matt…