Computational Astrophysics Laboratory

We promote in JEM-EUSO (Extreme Universe Space Observatory onboard Japanese Experiment Module) mission to explore the origin of extreme energy particles above 1020eV. It observes giant-air showers by extreme energy cosmic-ray from the orbit. JEM-EUSO is a super wide-field (60 degrees) telescope with a diameter of 2.5 meters planed to be installed in International Space Station. The feasibility study and conceptual design has continual for past three years under the collaboration with JAXA, RIKEN, and the JEM-EUSO international collaboration of thirteen countries (Japan, USA, Italy, France, Germany, Spain, Switzerland, Poland, Slovakia, Bulgaria, Russia, Mexico, Korea) JEM-ESO is planned to be launched around 2017, Other active studies include studies on the wakefield acceleration by Alfven wave emitted from the accretion disk around a supermassive blackhole and the relation of galactic environment with the Earth's surface environment. In particular, we explore the possibility that a starburst in our Milky Way Galaxy lead the snow ball Earth events in the past. They also include development of a G-APD camera with sub-μsec sampling and its application to bio molecular science, development of ReKOS which is a friendly application software for sharing the results among researchers, and education with computers.

Research Subjects

• Extreme Energy Cosmic-Rays
• Astrophysical Simulations
• Development of Super-High Speed Special-Purose Computers
• Materials Science of Earth explored by quantum simulation
• Development of a G-APD camera with sub-μsec sampling and its application to bio molecular science

Publications

1. Ryuho Kataoka, Toshikazu Ebisuzaki, Hiroko Miyahara, Shigenori Maruyama:
   "Snowball Earth events driven by starbursts of the Milky Way Galaxy "
   New Astronomy 21 (2013) 50-62
2. Ishiyama, T; Makino, J; Ebisuzaki, T.:
   "Gamma-ray Signal from Earth-mass Dark Matter"
   A stropysical Journalm (Letters), 723, L195-L200, (2010).
3. J.Yang, J.S. Tse, T.Iitaka:
   "First-principles study of liquid gallium at ambient and high pressure"
   J. Chem. Phys. 135, 044507 (2011)
4. Arai, N; Yasuoka, K; Koishi, Y; and Ebisuzaki, T.:
   "Asymmetric Brownian Moter Driven by Bubble Formation in a Hydrophobic Channel"
   ACS Nano, 4(10) 5905-5913 (2010)
5. Y.Kawasaki et al.:
   "The focal surface of the JEM-EUSO instrument"
   Astrophys. Space Sci. Trans., 7, 167-169, 2011
6. Guoying Gao, Artem R. Oganov, Aitor Bergara, Miguel Martinez-Canales, Tian Cui, Toshiaki Iitaka, Yanming Ma, and Guangtian Zou:
   "High-pressure crystal structures and superconductivity of Stannane (SnH4)"
   PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA, 107 (4): 1317-1320 JAN 26 2010
7. Koishi, T; Yasuoka, K; Fujikawa, S; Ebisuzaki, T; Zeng, XC.:
   "Coexistence and transition between Cassie and Wenzel state on pillared hydrophobic surface"
   PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA, 106 (21): 8435-8440 MAY 26 2009
8. Matsubara, H; Ebisuzaki, T; Yasuoka, K.:
   "Microscopic insights into nucleation in a sulfuric acid-water vapor mixture based on molecular dynamics simulation"
   JOURNAL OF CHEMICAL PHYSICS, 130 (10): Art. No. 104705 MAR 14 2009
9. Ogawa, T; Kawasaki, Y; Takizawa, Y; Ebisuzaki, T; Sakaki, N; Higuchi, M; Uchihori, Y; Kitamura, H; Wada, S.:
   "Radiation Resistance of Nd-Doped Laser Crystals for Space Application"
   JAPANESE JOURNAL OF APPLIED PHYSICS, 48 (8): Art. No. 088001 Part 1 AUG 2009
10. Kim H, Yamamoto M, Hosaka F, Terakami S, Nishitani C, Sawamura Y, Yamane H, Wu J. Matsumoto T, Matsuyama T and Yamamoto T.:
    "Molecular characterization of novel Ty1-copia-like retrotransposons in pear (Pyrus pyrifolia)"
    Tree Genetics & Genomes 7:845-856, 2011. DOI 10.1007/s11295-011-0379-1