Formulations and numerical methods for strongly magnetized compact objects in equilibrium or quasi-equilibrium, and their applications to gravitational wave astronomy

• Project/Area Number: 23540314
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Particle/Nuclear/Cosmic ray/Astro physics
• Research Institution: University of the Ryukyus
• Principal Investigator: URYU Koji 琉球大学, 理学部, 教授 (40457693)
• Project Period (FY): 2011 – 2013
• Project Status: Completed (Fiscal Year 2013)
• Budget Amount: ¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000); Fiscal Year 2013: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000); Fiscal Year 2012: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000); Fiscal Year 2011: ¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000)
• Keywords: 相対論・重力（理論） / 重力波 / 相対論的宇宙物理学 / 数値相対論 / 相対論的回転星 / 中性子星磁場 / 連星ブラックホール / 連星中性子星 / 国際研究者交流 アメリカ合衆国 / 国際情報交換 フランス：ギリシャ：ドイツ：英国 / ブラックホール－中性子星連星 / 国際研究者交流 フランス：ギリシャ / 国際情報交換 アメリカ合衆国：ドイツ / 国際研究者交流 フランス

Research Abstract

We have derived new formulations for computing equilibriums of strongly magnetized compact objects, and have been developing a set of new versatile codes, COCAL (Compact Object CALculator), for computing numerical solutions of various compact objects. Those solutions are useful not only for studying the structures of the compact objects, but also serve as initial data of simulations. The codes for computing uniformly or differentially rotating compact stars, strongly magnetized compact stars, and binary black hole initial data with the excision boundary as well as the trumpet puncture methods have been successfully developed. Calibrations of these codes are in progress, and the code for computing binary neutron stars in quasi-equilibrium is under construction.

Research Products

• [Journal Article] 強い磁場を持つ相対論的回転星の数値解 (2013)
  • Author(s): 瓜生康史
  • Journal Title: 原子核研究 Volume: 57 Pages: 59-62
• [Journal Article] Binary black hole ciruclar orbits computed with cocal (2013)
  • Author(s): Antonios Tsokaros and Koji Uryu
  • Journal Title: Journal of Engineering Mathematics Volume: 82 Pages: 133-141
  • Peer Reviewed
• [Journal Article] New code for equilibriums and quasiequilibrium initial data of compact objects. II. Convergence tests and comparisons of binary black hole initial data (2012)
  • Author(s): Koji Uryu, Antonios Tsokaros and Philippe Grandclement
  • Journal Title: Physical Review Volume: D86 Issue: 10
  • DOI: 10.1103/physrevd.86.104001
  • Peer Reviewed
• [Journal Article] New code for equilibriums and quasiequilibrium initial data of compact objects (2012)
  • Author(s): Koji Uryu, and Antonios Tsokaros
  • Journal Title: Physical Review Volume: D85 Issue: 6
  • DOI: 10.1103/physrevd.85.064014
  • Peer Reviewed
• [Journal Article] Binary black hole ciruclar orbits computed with cocal (2012)
  • Author(s): Antonios Tsokaros and Koji Uryu
  • Journal Title: Journal of Engineering Mathematics Volume: N/A Issue: 1 Pages: 1-9
  • DOI: 10.1007/s10665-012-9585-6
  • Peer Reviewed
• [Journal Article] Magnetohydrodynamics in stationary and axisymmetric spacetimes : a fully covariant approach (2011)
  • Author(s): Eric Gourgoulhon, Charalampos Markakis, Koji Uryu, and Yoshiharu Eriguchi
  • Journal Title: Physical Review Volume: D83 Issue: 10
  • DOI: 10.1103/physrevd.83.104007
  • Peer Reviewed
• [Presentation] Equilibriums and quasi-equilibrium initial data of compact objects (2013)
  • Author(s): Koji Uryu(発表者)
  • Organizer: YITP long term workshop "Gravitational waves and numerical relativity"
  • Place of Presentation: 京都大学基礎物理学研究所
  • Year and Date: 2013-05-23
• [Presentation] COCAL : A new code for compact objects in (quasi-)equilibriums (2013)
  • Author(s): Koji Uryu(発表者) and Antonios Tsokaros
  • Organizer: YKIS 2013 "Gravitational Waves - Revolution in Astronomy & Astrophysics"
  • Place of Presentation: 京都大学基礎物理学研究所
• [Presentation] Trumpet puncture initial data for black holes on COCAL (2013)
  • Author(s): Takumu Kawamura(発表者), Antonios Tsokaros, Koji Uryu, and Naomichi Yonaha
  • Organizer: 3rd Iberian Gravitational-Wave Meeting 2013
  • Place of Presentation: ADEIT, Universitat de Valencia, Spain
• [Presentation] COCAL: A new code for compact objects in (quasi-)equilibriums (2013)
  • Author(s): Koji Uryu and Antonios Tsokaros
  • Organizer: YKIS 2013 “Gravitational Waves - Revolution in Astronomy & Astrophysics”
  • Place of Presentation: 京都大学基礎物理学研究所
• [Presentation] 磁場を持つ相対論的回転星の数値解 (2012)
  • Author(s): Koji Uryu(発表者), Eric Gourgoulhon, Charalampos Markakis, and Yoshiharu Eriguchi
  • Organizer: ハドロン物質の諸相と状態方程式-中性子星の観測に照らして-研究会
  • Place of Presentation: 京都大学基礎物理学研究所
• [Presentation] 磁場を持つ相対論的回転星の数値解 (2012)
  • Author(s): Koji Uryu, Eric Gourgoulhon, Charalampos Markakis, and Yoshiharu Eriguchi
  • Organizer: ハドロン物質の諸相と状態方程式－中性子星の観測に照らして－研究会
  • Place of Presentation: 京都大学基礎物理学研究所
• [Presentation] COCAL : A new code for equilibriums and quasi-equilibrium initial data of compact objects (2011)
  • Author(s): Antonios Tsokaros(発表者) and Koji Uryu
  • Organizer: Tercentenary of the Laplace-Runge-Lenz vector
  • Place of Presentation: Salt Rock Hotel, Ballito, KZN, South Africa
• [Presentation] Equilibriums and quasi-equilibrium initial data of compact objects
  • Author(s): Koji Uryu
  • Organizer: YITP long term workshop “Gravitational waves and numerical relativity”
  • Place of Presentation: 京都大学基礎物理学研究所
• [Remarks] 琉球大学理学部 物質地球科学科 物理系 宇宙物理学研究室ホームページ
  • URL: http://www.phys.u-ryukyu.ac.jp/~apweb_user/
• [Remarks] COCAL コードドキュメントページ(仮設)
  • URL: http://www.phys.u-ryukyu.ac.jp/~uryu/Cocal_tmp/
• [Remarks] 琉球大学理学部 物質地球科学科 物理系 宇宙物理学研究室
  • URL: http://www.phys.u-ryukyu.ac.jp/̃apweb_user/
• [Remarks] 琉球大学理学部 物質地球科学科 物理系 宇宙物理学研究室
  • URL: http://www.phys.u-ryukyu.ac.jp/~apweb_user/
• [Remarks]
  • URL: http://www.phys.u-ryukyu.ac.jp/~apweb_user