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Numerical experiments of adjusted BSSN systems for controlling constraint violations
Kenta Kiuchi, Hisa-aki Shinkai
We present our numerical comparisons between the BSSN formulation widely used in numerical relativity today and its adjusted versions using constraints. We performed three testbeds…
Equilibrium Configurations of Strongly Magnetized Neutron Stars with Realistic Equations of State
Kenta Kiuchi, Kei Kotake
We investigate equilibrium sequences of magnetized rotating stars with four kinds of realistic equations of state (EOSs) of SLy (Douchin et al.), FPS (Pandharipande et al.), Shen (…
Gravitational Wave Signals from Chaotic System: A Point Mass with A Disk
Kenta Kiuchi, Hiroko Koyama, Kei-ichi Maeda
We study gravitational waves from a particle moving around a system of a point mass with a disk in Newtonian gravitational theory. A particle motion in this system can be chaotic w…
1/f fluctuations in spinning-particle motions around Schwarzschild black hole
Hiroko Koyama, Kenta Kiuchi, Tetsuro Konishi
We study the properties of chaos in the motions of a spinning test particle in Schwarzschild spacetime. We characterize the chaos using the power spectrum of the time series of …