383 citations · 3.2k across the 50 of their papers we have counts for
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Estimate of the radius responsible for quasinormal modes in the extreme Kerr limit and asymptotic behavior of the Sasaki-Nakamura transformation
Hiroyuki Nakano, Norichika Sago, Takahiro Tanaka +1
The Sasaki-Nakamura transformation gives a short-ranged potential and a convergent source term for the master equation of perturbations in the Kerr space-time. In this paper, we st…
Detectability of bigravity with graviton oscillations using gravitational wave observations
Tatsuya Narikawa, Koh Ueno, Hideyuki Tagoshi +3
The gravitational waveforms in the ghost-free bigravity theory exhibit deviations from those in general relativity. The main difference is caused by graviton oscillations in the bi…
Possible existence of viable models of bi-gravity with detectable graviton oscillations by gravitational wave detectors
Antonio De Felice, Takashi Nakamura, Takahiro Tanaka
We discuss graviton oscillations based on the ghost free bi-gravity theory. We point out that this theory possesses a natural cosmological background solution which is very close t…
Response of Interferometric Detectors to Scalar Gravitational Waves
Ken-ichi Nakao, Tomohiro Harada, Masaru Shibata +2
We rigorously analyze the frequency response functions and antenna sensitivity patterns of three types of interferometric detectors to scalar mode of gravitational waves which is p…
Location of the innermost stable circular orbit of binary neutron stars in the post Newtonian approximations of general relativity
Masaru Shibata, Keisuke Taniguchi, Takashi Nakamura
In this paper, we present results obtained from our recent studies on the location of the innermost stable circular orbit (ISCO) for binary neutron stars (BNSs) in several levels o…
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…
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…
Scalar gravitational wave from Oppenheimer-Snyder collapse in scalar- tensor theories of gravity
Tomohiro Harada, Takeshi Chiba, Ken-ichi Nakao +1
Unlike general relativity, scalar-tensor theories of gravity predict scalar gravitational waves even from a spherically symmetric gravitational collapse. We solve numerically the g…