4 papers
Surface gravity in dynamical spherically symmetric spacetimes
G. Fodor, K. Nakamura, Y. Oshiro +1
A definition of surface gravity at the apparent horizon of dynamical spherically symmetric spacetimes is proposed. It is based on a unique foliation by ingoing null hypersurfaces.…
Quantum Formation of Black Hole and Wormhole in Gravitational Collapse of a Dust Shell
K. Nakamura, Y. Oshiro, A. Tomimatsu
Quantum-mechanical model of self-gravitating dust shell is considered. To clarify the relation between classical and quantum spacetime which the shell collapse form, we consider va…
Critical Behavior of Black Hole Formation in a Scalar Wave Collapse
Y. Oshiro, K. Nakamura, A. Tomimatsu
We present a self-similar model of spherically symmetric collapse of a massless scalar field with a parameter . The black hole formation is explicitly shown to occur only in the…
Quantum Fluctuations of Black Hole Geometry
K. Nakamura, S. Konno, Y. Shiro +1
By using the minisuperspace model for the interior metric ofstatic black holes, we solve the Wheeler-DeWitt equation to study quantum mechanics of the horizon geometry. Our basic i…