5 papers
Singularities and self-similarity in gravitational collapse
Tomohiro Harada
Einstein's field equations in general relativity admit a variety of solutions with spacetime singularities. Numerical relativity has recently revealed the properties of somewhat ge…
Cosmological wormholes
Hideki Maeda, Tomohiro Harada, B. J. Carr
Motivated by the cosmological wormhole solutions obtained from our recent numerical investigations, we provide a definition of a wormhole which applies to dynamical situations. Our…
High-Speed Collapse of a Hollow Sphere of Type I Matter
Zahid Ahmad, Tomohiro Harada, Ken-ichi Nakao +1
In this paper, we study the dynamics of a hollow spherical matter collapsing with very large initial velocity. The spacetime is initially very similar to the Vaidya solution, and t…
Feasibility of extracting a admixture probability in the neutron-rich Li hypernucleus
T. Harada, A. Umeya, Y. Hirabayashi
We examine theoretically production of the neutron-rich Li hypernucleus by a double-charge exchange (, ) reaction on a B target with distorted-wave impuls…
The - coupling effect in the neutron-rich -hypernucleus Li by microscopic shell model
A. Umeya, T. Harada
We investigate the structure of the neutron-rich -hypernucleus Li by using microscopic shell-model calculations considering a - coupling effect. The calculated $Σ…