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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…
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: "…
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…