Quasi-equilibriums of magnetized binary neutron stars and initial data for numerical relativity simulations

2010 Fiscal Year Final Research Report

• Project/Area Number: 20540275
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Particle/Nuclear/Cosmic ray/Astro physics
• Research Institution: University of the Ryukyus
• Principal Investigator: URYU Koji University of the Ryukyus, 理学部, 准教授 (40457693)
• Research Collaborator: GOURGOULHON Eric CNRS/Observatoire de Paris・Universite Paris Diderot, Directeur de recherche ; MARKAKIS Charalampos University of Wisconsin-Milwaukee, 大学院生(博士課程)
• Project Period (FY): 2008 – 2010
• 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 / 連星中性子星 / 高速回転星 / ブラックホール-中性子星連星 / 中性子星磁場

Research Abstract

Formulations for computing quasi-equilibrium of magnetized binary neutron stars and their generalized thermodynamic laws are derived. We develop a new code, Cocal-Compact Object CALculator, to calculate structures of compact objects in quasi-equilibriums, and successfully compute, for example, triaxially deformed rapidly rotating neutron stars. Quasi-equilibrium solutions for binary neutron stars are also calculated, and they are provided as initial data sets for simulations of binary inspirals. Gravitational waveforms obtained the simulations are analyzed.

Research Products

• [Journal Article] Thermodynamics of magnetized binary compact objects (2010)
  • Author(s): Koji Uryu, Eric Gourgoulhon, Charalampos Markakis
  • Journal Title: Physical Review D 82巻 Pages: 1040541-10405421
  • Peer Reviewed
• [Journal Article] Non-conformally flat initial data for binary compact objects (2009)
  • Author(s): Koji Uryu, Francois Limousin, John L. Friedman, Eric Gourgoulhon, Masaru Shibata
  • Journal Title: Physical Review D 80巻 Pages: 1240041-12400423
  • Peer Reviewed
• [Journal Article] Measuring the neutron star equation of state with gravitational wave observations (2009)
  • Author(s): Jocelyn S. Read, Charalampos Markakis, Masaru Shibata, Koji Uryu, Jolien D. E. Creighton, John L. Friedman
  • Journal Title: Physical Review D 79巻 Pages: 1240331-12403312
  • Peer Reviewed
• [Journal Article] Quasiequilibrium models for triaxially deformed rotating compact stars (2008)
  • Author(s): Xing Huang, Charalampos Markakis, Noriyuki Sugiyama, Koji Uryu
  • Journal Title: Physical Review D 78巻 Pages: 1240231-12402313
  • Peer Reviewed
• [Presentation] Magnetized binary black holes and neutron stars in equilibrium (2010)
  • Author(s): Koji Uryu, Eric Gourgoulhon, Charalampos Markakis
  • Organizer: 20th workshop on General Relativity and Gravitation in Japan (JGRG20)
  • Place of Presentation: YITP, Kyoto University, Kyoto, Japan
  • Year and Date: 20100921-20100925
• [Presentation] Magnetized binary compact objects (2010)
  • Author(s): Eric Gourgoulhon, Koji Uryu, Charalampos Markakis
  • Organizer: 19^<th> International Conference on General Relativity and Gravitation (GR19)
  • Place of Presentation: Mexico City, Mexico
  • Year and Date: 20100705-20100709
• [Presentation] Thermodynamics of magnetized binary neutron stars and black holes (2010)
  • Author(s): Koji Uryu, Eric Gourgoulhon, Charalampos Markakis
  • Organizer: Eriguchi fest : Physics of Compact Objects
  • Place of Presentation: Rizzan Sea-Park hotel, Onnason, Okinawa, Japan
  • Year and Date: 20100316-20100317
• [Presentation] Inferring the neutron star equation of state from binary inspiral waveforms (2009)
  • Author(s): Charalampos Markakis, Jocelyn S. Read, Masaru Shibata, Koji Uryu, Jolien D. E. Creighton, John L. Friedman
  • Organizer: 12th Marcel Grossmann Meeting
  • Place of Presentation: Institut d'Astrophysique de Paris, Paris, France
  • Year and Date: 20090712-20090718
• [Presentation] Extracting equation of state parameters from inspiral waveforms (2009)
  • Author(s): John L. Friedman, Jocelyn Read, Charalampos Markakis, Masaru Shibata, Koji Uryu, Jolien Creighton, Keisuke Taniguchi
  • Organizer: American Physical Society, 2009 APS April Meeting
  • Year and Date: 20090502-20090505
• [Remarks] ホームページ等
  • URL: http://www.phys.u-ryukyu.ac.jp/~apweb_user