Developing a new framework of gravitational N-body simulations for exascale computing

• Project/Area Number: 15K12031
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: High performance computing
• Research Institution: Chiba University
• Principal Investigator: Ishiyama Tomoaki 千葉大学, 統合情報センター, 准教授 (90616426)
• Project Period (FY): 2015-04-01 – 2018-03-31
• Project Status: Completed (Fiscal Year 2017)
• Budget Amount: ¥3,380,000 (Direct Cost: ¥2,600,000、Indirect Cost: ¥780,000); Fiscal Year 2017: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000); Fiscal Year 2016: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000); Fiscal Year 2015: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
• Keywords: 高性能計算 / 並列処理 / 分散処理 / データベース / 天文 / 可視化 / ネットワーク / 並列計算

Outline of Final Research Achievements

We develop a new framework of gravitational N-body simulations that enable to conduct numerical simulations and their post analysis seamlessly.
By combining a halo finding code with three-dimensional positions of simulation particles and that of cosmological N-body simulation, it becomes possible to reduce the data size for raw particle data significantly. We also made it possible to download the big dataset of halo/subhalo merger trees by means of database system. Each user can select properties downloaded and ranges of their value, which enables to download fast.

Research Products

• [Journal Article] Imprints of the super-Eddington accretion on the quasar clustering (2017)
  • Author(s): T.Oogi, M.Enoki,T.Ishiyama, M.Kobayashi, R.Makiya, M.Nagashima, T.Okamoto, H.Shirakata
  • Journal Title: Monthly Notices of the Royal Astronomical Society Volume: 471 Issue: 1 Pages: L21-L25
  • DOI: 10.1093/mnrasl/slx102
  • Peer Reviewed / Open Access
• [Journal Article] Theoretical re-evaluations of the black hole mass-bulge mass relation - I. Effect of seed black hole mass (2016)
  • Author(s): Shirakata, Hikari; Kawaguchi, Toshihiro; Okamoto, Takashi; Makiya, Ryu; Ishiyama, Tomoaki; Matsuoka, Yoshiki; Nagashima, Masahiro; Enoki, Motohiro; Oogi, Taira; Kobayashi, Masakazu A. R.
  • Journal Title: Monthly Notices of the Royal Astronomical Society Volume: 461 Issue: 4 Pages: 4389-4394
  • DOI: 10.1093/mnras/stw1798
  • Peer Reviewed / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] Quasar clustering in a galaxy and quasar formation model based on ultra high-resolution N-body simulations (2016)
  • Author(s): Taira Oogi, Motohiro Enoki, Tomoaki Ishiyama, Masakazu A. R. Kobayashi, Ryu Makiya, Masahiro Nagashima
  • Journal Title: Monthly Notices of the Royal Astronomical Society Volume: 456 Issue: 1 Pages: 30-34
  • DOI: 10.1093/mnrasl/slv169
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [Journal Article] Mass and size growth of early-type galaxies by dry mergers in cluster environments (2016)
  • Author(s): Taira Oogi, Asao Habe, Tomoaki Ishiyama
  • Journal Title: Monthly Notices of the Royal Astronomical Society Volume: 456 Issue: 1 Pages: 300-313
  • DOI: 10.1093/mnras/stv2581
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] The New Numerical Galaxy Catalog (ν^2GC): An Updated Semi-analytic Model of Galaxy and AGN with Large Cosmological N-body Simulations (2016)
  • Author(s): Ryu Makiya, Motohiro Enoki, Tomoaki Ishiyama, Masakazu A.R. Kobayashi, Masahiro Nagashima, Takashi Okamoto, Katsuya Okoshi, Taira Oogi, Hikari Shirakata
  • Journal Title: Publications of the Astronomical Society of Japan Volume: 68 Issue: 2 Pages: 25-51
  • DOI: 10.1093/pasj/psw005
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [Presentation] 大規模宇宙論的N体シミュレーション・データベースの公開 (2017)
  • Author(s): 石山智明
  • Organizer: 日本天文学会2017年秋季年会
• [Presentation] 大規模宇宙論的N体シミュレーション・データベースの公開 (2017)
  • Author(s): 石山智明
  • Organizer: 平成29年度国立天文台天文シミュレーションプロジェクト ユーザーズミーティング
• [Presentation] 大規模宇宙論的N体シミュレーション (2017)
  • Author(s): 石山智明
  • Organizer: 素粒子・原子核・宇宙「京からポスト京に向けて」シンポジウム
• [Presentation] The ν2GC simulations: Quantifying the dark side of the universe in the Planck cosmology (2016)
  • Author(s): Tomoaki Ishiyama
  • Organizer: The 7th East-Asian Numerical Astrophysics Meeting
  • Place of Presentation: Beijing, China
  • Year and Date: 2016-10-24
  • Int'l Joint Research
• [Presentation] Supercomputer Simulations of Structure Formation in the Universe (2016)
  • Author(s): Tomoaki Ishiyama
  • Organizer: IAU Symposium 325 Astroinformatics
  • Place of Presentation: Sorrento, Italy
  • Year and Date: 2016-10-20
  • Int'l Joint Research / Invited
• [Presentation] 様々なアーキテクチャのスーパーコンピュータ上における大規模シミュレーション、プログラム最適化 (2016)
  • Author(s): 石山智明
  • Organizer: 電子情報通信学会FIIS研究会
  • Place of Presentation: 千葉大学
  • Invited
• [Presentation] The n2Gc Simulations: Quantifying the Dark Side of the Universe in the Planck Cosmology (2015)
  • Author(s): Tomoaki Ishiyama
  • Organizer: IAU General Assembly Meeting
  • Place of Presentation: Hawaii Convention Center, Honolulu, Hawaii
  • Year and Date: 2015-08-03
  • Int'l Joint Research
• [Presentation] High Resolution Simulations for Hierarchical Formation of Dark Matter Halos Hosting Galaxies and AGNs at High Redshift (2015)
  • Author(s): Tomoaki Ishiyama
  • Organizer: IAU General Assembly Meeting
  • Place of Presentation: Hawaii Convention Center, Honolulu, Hawaii
  • Year and Date: 2015-08-03
  • Int'l Joint Research
• [Remarks] Cosmological N-body simulations databases
  • URL: http://hpc.imit.chiba-u.jp/~ishiymtm/db.html
• [Remarks] The ν^2GC simulations
  • URL: http://hpc.imit.chiba-u.jp/~nngc/