10.9k citations
Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
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6 papers · 2 filters
Innermost Stable Circular Orbit of a Spinning Particle in Kerr Spacetime
Shingo Suzuki, Kei-ichi Maeda
We study stability of a circular orbit of a spinning test particle in a Kerr spacetime. We find that some of the circular orbits become unstable in the direction perpendicular to t…
Chaotic Dynamics and Two-Field Inflation
Richard Easther, Kei-ichi Maeda
We demonstrate the existence of chaos in realistic models of two-field inflation. The chaotic motion takes place after the end of inflation, when the fields are free to oscillate a…
Lorentzian dynamics in the Ashtekar gravity
Hisa-aki Shinkai, Gen Yoneda
We examine the advantages of the SO(3)-ADM (Ashtekar) formulation of general relativity, from the point of following the dynamics of the Lorentzian spacetime in direction of applyi…
Non-Abelian Black Holes in Brans-Dicke Theory
Takashi Tamaki, Takashi Torii, Kei-ichi Maeda
We find a black hole solution with non-Abelian field in Brans-Dicke theory. It is an extension of non-Abelian black hole in general relativity. We discuss two non-Abelian fields: "…
A trick for passing degenerate points in Ashtekar formulation
Gen Yoneda, Hisaaki Shinkai, Akika Nakamichi
We examine one of the advantages of Ashtekar's formulation of general relativity: a tractability of degenerate points from the point of view of following the dynamics of classical…
Gravitational Waves in Brans-Dicke Theory : Analysis by Test Particles around a Kerr Black Hole
Motoyuki Saijo, Hisa-aki Shinkai, Kei-ichi Maeda
Analyzing test particles falling into a Kerr black hole, we study gravitational waves in Brans-Dicke theory of gravity. First we consider a test particle plunging with a constant a…