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4 papers · 2 filters
Dilatonic Black Holes with Gauss-Bonnet Term
Takashi Torii, Hiroki Yajima, Kei-ichi Maeda
We discuss black holes in an effective theory derived from a superstring model, which includes a dilaton field, a gauge field and the Gauss-Bonnet term. Assuming U(1) or SU(2) symm…
Monopole-Bubble in Early Universe
Yoonbai Kim, Kei-ichi Maeda, Nobuyuki Sakai
The nucleation and evolution of bubbles are investigated in the model of an -symmetric scalar field coupled to gravity in the high temperature limit. It is shown that, in add…
Chaos in Schwarzschild Spacetime : The Motion of a Spinning Particle
Shingo Suzuki, Kei-ichi Maeda
We study the motion of a spinning test particle in Schwarzschild spacetime, analyzing the Poincaré map and the Lyapunov exponent. We find chaotic behavior for a particle with spin…
Constraints and Reality Conditions in the Ashtekar Formulation of General Relativity
Gen Yoneda, Hisaaki Shinkai
We show how to treat the constraints and reality conditions in the -ADM (Ashtekar) formulation of general relativity, for the case of a vacuum spacetime with a cosmological…