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- Masaki Ando, Koji Arai, +111 authors J. Yokoyama
- 2004

Masaki Ando, ∗ Koji Arai, Youichi Aso, Peter Beyersdorf, Kazuhiro Hayama, Yukiyoshi Iida, Nobuyuki Kanda, Seiji Kawamura, Kazuhiro Kondo, Norikatsu Mio, Shinji Miyoki, Shigenori Moriwaki, Shigeo Nagano, Kenji Numata, Shuichi Sato, Kentaro Somiya, Hideyuki Tagoshi, Hirotaka Takahashi, 10 Ryutaro Takahashi, Daisuke Tatsumi, Yoshiki Tsunesada, Zong-Hong Zhu,… (More)

To explore the possibility that an inflationary universe can be created out of a stable particle in the laboratory, we consider the classical and quantum dynamics of a magnetic monopole in the thin-shell approximation. Classically there are three types of solutions: stable, collapsing and inflating monopoles. We argue that the transition from a stable… (More)

- Ken-ichi Nakao, Kaori Tanaka, Suguru Ichiishi, Hiroshiege Mikamo, Toshiyuki Shibata, Kunitomo Watanabe
- Antimicrobial agents and chemotherapy
- 2009

Antimicrobial susceptibilities of 23 strains of Desulfovibrio spp. were tested by Etest. Generally, Desulfovibrio spp. were highly susceptible to sulbactam-ampicillin, meropenem, clindamycin, metronidazole, and chloramphenicol: MIC(90)s of 6, 4, 0.19, 0.25, and 8 microg/ml, respectively. In addition, these strains generally showed high MICs to piperacillin… (More)

Recent measurements of the luminosity distance DL(z) using Type Ia supernovae [1–3] suggest that accurate DL(z) may be obtained in near future. Especially SNAP [4] will give us the luminosity distance of ∼2000 Type Ia supernovae with an accuracy of a few % up to z ∼ 1.7 every year. On the other hand from the observation of the first Doppler peak of the… (More)

Propagation of light in a clumpy universe is examined. As an inhomogeneous matter distribution, we take a spherical void surrounded by a dust shell, where the “lost mass” in the void is compensated by the shell. We study how the angular-diameter distance behaves when such a structure exists. The angular-diameter distance is calculated by integrating the… (More)

Gravitational collapse is one of the most fruitful subjects in gravitational physics. It is well known that singularity formation is inevitable in complete gravitational collapse. It was conjectured that such a singularity should be hidden by horizons if it is formed from generic initial data with physically reasonable matter fields. Many possible… (More)

The initial data of gravity for a cylindrical matter distribution confined to a brane are studied in the framework of the single-brane Randall-Sundrum scenario. In this scenario, the 5-dimensional nature of gravity appears in the short-range gravitational interaction. We find that a sufficiently thin configuration of matter leads to the formation of a… (More)

- Chul-Moon Yoo, Hirotada Okawa, Ken-ichi Nakao
- Physical review letters
- 2013

Time evolution of a black hole lattice toy model universe is simulated. The vacuum Einstein equations in a cubic box with a black hole at the origin are numerically solved with periodic boundary conditions on all pairs of faces opposite to each other. Defining effective scale factors by using the area of a surface and the length of an edge of the cubic box,… (More)

We numerically study the dynamics of an imploding hollow cylinder composed of dust. Since there is no cylindrical black hole in 4-dimensional spacetime with physically reasonable energy conditions, a collapsed dust cylinder involves a naked singularity accompanied by its causal future, or a fatal singularity which terminates the history of the whole… (More)

- Hideyuki Tagoshi, Nobuyuki Kanda, +65 authors Toshitaka Yamazaki

Hideyuki Tagoshi, Nobuyuki Kanda, Takahiro Tanaka, Daisuke Tatsumi, Souichi Telada, Masaki Ando, Koji Arai, Akito Araya, Hideki Asada, Mark A. Barton, Masa-Katsu Fujimoto, Mitsuhiro Fukushima, Toshifumi Futamase, Gerhard Heinzel, Gen’ichi Horikoshi, Hideki Ishizuka, Norihiko Kamikubota, Keita Kawabe, Seiji Kawamura, Nobuki Kawashima, Yasufumi Kojima,… (More)