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Collapse of self-interacting fields in asymptotically flat spacetimes: do self-interactions render Minkowski spacetime unstable?
Hirotada Okawa, Vitor Cardoso, Paolo Pani
The nonlinear instability of anti-de Sitter spacetime has recently been established with the striking result that generic initial data collapses to form black holes. This outcome s…
Coalescence of binary neutron stars in a scalar-tensor theory of gravity
Masaru Shibata, Keisuke Taniguchi, Hirotada Okawa +1
We carry out numerical-relativity simulations of coalescing binary neutron stars in a scalar-tensor theory that admits spontaneous scalarization. We model neutron stars with realis…
Initial Conditions for Numerical Relativity -- Introduction to numerical methods for solving elliptic PDEs
Hirotada Okawa
Numerical relativity became a powerful tool to investigate the dynamics of binary problems with black holes or neutron stars as well as the very structure of General Relativity. Al…
Black Hole Universe: Time Evolution
Chul-Moon Yoo, Hirotada Okawa, Ken-ichi Nakao
Time evolution of a black hole lattice universe is simulated. The vacuum Einstein equations in a cubic box with a black hole at the origin are numerically solved with periodic boun…
The mass ejection from the merger of binary neutron stars
Kenta Hotokezaka, Kenta Kiuchi, Koutarou Kyutoku +4
Numerical-relativity simulations for the merger of binary neutron stars are performed for a variety of equations of state (EOSs) and for a plausible range of the neutron-star mass,…