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12 papers · 2 filters
Five-dimensional Black Hole and Particle Solution with Non-Abelian Gauge Field
Naoya Okuyama, Kei-ichi Maeda
We study the 5-dimensional Einstein-Yang-Mills system with a cosmological constant. Assuming a spherically symmetric spacetime, we find a new analytic black hole solution, which ap…
Criticality and convergence in Newtonian collapse
Tomohiro Harada, Hideki Maeda, Benoit Semelin
We study through numerical simulation the spherical collapse of isothermal gas in Newtonian gravity. We observe a critical behavior which occurs at the threshold of gravitational i…
Particle velocity in noncommutative space-time
Takashi Tamaki, Tomohiro Harada, Umpei Miyamoto +1
We investigate a particle velocity in the -Minkowski space-time, which is one of the realization of a noncommutative space-time. We emphasize that arrival time analyses by high-…
Diagonalizability of Constraint Propagation Matrices
Gen Yoneda, Hisa-aki Shinkai
In order to obtain stable and accurate general relativistic simulations, re-formulations of the Einstein equations are necessary. In a series of our works, we have proposed using e…
A Classification of Spherically Symmetric Kinematic Self-Similar Perfect-Fluid Solutions
Hideki Maeda, Tomohiro Harada, Hideo Iguchi +1
We classify all spherically symmetric spacetimes admitting a kinematic self-similar vector of the second, zeroth or infinite kind. We assume that the perfect fluid obeys either a p…
Polar Perturbations of Self-gravitating Supermassive Global Monopoles
Hiroshi Watabe, Takashi Torii
Spontaneous global symmetry breaking of O(3) scalar field gives rise to point-like topological defects, global monopoles. By taking into account self-gravity,the qualitative featur…