Here is Daisuke Ida's home page.

Recent Works:

* Daisuke Ida, Takahiro Okamoto: You Cannot Press Out the Black Hole (pdf)

As the title indicates, it is shown that a ball-shaped black hole

cannot be pressed out into a doughnuts-shaped black hole.

Daisuke Ida, Akihiro Ishibashi, Tetsuya Shiromizu:

Topology and Uniqueness of Higher Dimensional Black Holes (pdf)

A review article on higher dimensional black holes to appear in Prog. Theor. Phys. Suppl.

* Daisuke Ida: On the Topology of Black Lenses (pdf)

We discuss the topological structure of black hole space-times

with the event horizon diffeomorphic with the Lens space.

* Masaru Siino, Daisuke Ida: Half Period Theorem of Binary Black Holes (pdf)

We give a Theorem claiming that binary black holes cannot orbit

for the half period before their event horizons merge into one.

Address: Department of Physics, Gakushuin University,

Tokyo 171-8588, Japan

Phone: +81 3 3986 0221 (ext 6483)

E-mail: daisuke.ida@gakushuin.ac.jp