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14 papers · 2 filters
Kink instability and stabilization of the Friedmann universe with scalar fields
Hideki Maeda, Tomohiro Harada
The evolution of weak discontinuity is investigated in the flat FRW universe with a single scalar field and with multiple scalar fields. We consider both massless scalar fields and…
Chaos of Yang-Mills Field in Class A Bianchi Spacetimes
Yoshida Jin, Kei-ichi Maeda
Studying Yang-Mills field and gravitational field in class A Bianchi spacetimes, we find that chaotic behavior appears in the late phase (the asymptotic future). In this phase, the…
Observation results by the TAMA300 detector on gravitational wave bursts from stellar-core collapses
Masaki Ando, Koji Arai, Youichi Aso +19
We present data-analysis schemes and results of observations with the TAMA300 gravitational-wave detector, targeting burst signals from stellar-core collapse events. In analyses fo…
Quantum Effect and Curvature Strength of Naked Singularities
Umpei Miyamoto, Hideki Maeda, Tomohiro Harada
There are many solutions to the Einstein field equations that demonstrate naked singularity (NS) formation after regular evolution. It is possible, however, that such a quantum eff…
Probing Strong-Field Scalar-Tensor Gravity with Gravitational Wave Asteroseismology
Hajime Sotani, Kostas D. Kokkotas
We present an alternative way of tracing the existence of a scalar field based on the analysis of the gravitational wave spectrum of a vibrating neutron star. Scalar-tensor theorie…
Quasinormal modes and stability of the rotating acoustic black hole: numerical analysis
Vitor Cardoso, Jose' P. S. Lemos, Shijun Yoshida
The study of the quasinormal modes (QNMs) of the 2+1 dimensional rotating draining bathtub acoustic black hole, the closest analogue found so far to the Kerr black hole, is perform…