Yasufumi Kojima

Last Updated :2021/04/06

Affiliations, Positions
Graduate School of Advanced Science and Engineering, Professor
E-mail
ykojima-physhiroshima-u.ac.jp
Self-introduction
My research subject is theoretical astrophysics, especially relativistic stars.

Basic Information

Academic Degrees

  • Ph.D., Kyoto University
  • M.A., Kyoto University

Educational Activity

  • 【Bachelor Degree Program】School of Science : Physics
  • 【Master's Program】Graduate School of Advanced Science and Engineering : Division of Advanced Science and Engineering : Physics Program
  • 【Doctoral Program】Graduate School of Advanced Science and Engineering : Division of Advanced Science and Engineering : Physics Program

Research Fields

  • Mathematical and physical sciences;Physics;Particle / Nuclear / Cosmic ray / Astro physics

Research Keywords

  • Gravitational Waves
  • Black Holes
  • High energy Astrophysics

Educational Activity

Course in Charge

  1. 2021, Liberal Arts Education Program1, 2Term, Introductory Seminar for First-Year Students
  2. 2021, Undergraduate Education, 4Term, Advanced Physics
  3. 2021, Undergraduate Education, First Semester, Theory of Relativity
  4. 2021, Undergraduate Education, First Semester, Special Study for Graduation A
  5. 2021, Undergraduate Education, Second Semester, Special Study for Graduation B
  6. 2021, Graduate Education (Master's Program) , First Semester, Seminar of Cosmology and Astrophysics
  7. 2021, Graduate Education (Master's Program) , Second Semester, Seminar of Cosmology and Astrophysics
  8. 2021, Graduate Education (Master's Program) , First Semester, Seminar in Physical Science
  9. 2021, Graduate Education (Master's Program) , Second Semester, Seminar in Physical Science
  10. 2021, Graduate Education (Doctoral Program) , First Semester, Special Research for Physical Science
  11. 2021, Graduate Education (Doctoral Program) , Second Semester, Special Research for Physical Science
  12. 2021, Graduate Education (Master's Program) , 3Term, Exercise in Physics II
  13. 2021, Graduate Education (Master's Program) , 1Term, Cosmology and Astrophysics
  14. 2021, Graduate Education (Master's Program) , 1Term, Exercise in Physics I
  15. 2021, Graduate Education (Master's Program) , 2Term, Exercise in Physics I
  16. 2021, Graduate Education (Master's Program) , 4Term, Exercise in Physics II
  17. 2021, Graduate Education (Master's Program) , 1Term, Special Exsecise in Physics A
  18. 2021, Graduate Education (Master's Program) , 2Term, Special Exsecise in Physics A
  19. 2021, Graduate Education (Master's Program) , 3Term, Special Exsecise in Physics B
  20. 2021, Graduate Education (Master's Program) , 4Term, Special Exsecise in Physics B
  21. 2021, Graduate Education (Master's Program) , Academic Year, Special Research in Physics
  22. 2021, Graduate Education (Doctoral Program) , Academic Year, Special Research in Physics

Research Activities

Academic Papers

  1. General Relativistic Collapse to Black Holes and GravitationalWaves from Black Holes, Progress of Theoretical Physics, Suppl(90), 1-218, 19870401
  2. The Effects of Black Hole Rotation on Line Profiles from Accretion Disk, Monthly Notices of the Royal Astronomical Society, 250(3), 629-637, 19910701
  3. Magnetic Field Evolution with Hall Drift in Neutron Stars, Monthly Notices of the Royal Astronomical Society, 266(3), 597-608, 19940201
  4. Equations Governing the Nonradial Oscillations of a Slowly Rotating Relativistic Star, Physical Review, D46(10), 4289-4303, 19921101
  5. Quasi-toroidal oscillations in rotating relativistic stars, Monthly Notices of the Royal Astronomical Society, 293, 49-52, 19980401
  6. KAGRA: 2.5 generation interferometric gravitational wave detector, NATURE ASTRONOMY, 3(1), 35-40, 201901
  7. Deformation of relativistic magnetized stars, Astronomy and Astrophysics Supplement Series, 352, 211-216, 19990101
  8. The bottom magnetic field and magnetosphere evolution of neutron star in low-mass X-ray binary, Monthly Notices of the Royal Astronomical Society, 366(1), 137-143, 20060210
  9. Stable Operation of a 300-m Laser Interferometer withSufficient Sensitivity to DetectGravitational Wave Events within Our Galaxy, Physical Review Letters, 86(18), 3950-3954, 20010401
  10. The Dynamical Stability of a Fat Disk with Constant SpecificAngular Momentum, Progress of Theoretical Physics, 75(2), 251-261, 19860201
  11. High-Overtone Normal Modes of Schwarzschild Black Holes, Classical and Quantum Gravity, 7(2), L47-L53, 19900401
  12. Flattening modulus of a neutron star by rotation and magnetic field, ASTRONOMY & ASTROPHYSICS, 356(1), 234-237, 200004
  13. The Dynamical Stability of Tori around a Schwarzschild Black Hole, Progress of Theoretical Physics, 75(6), 1464-1467, 19860601
  14. Normal Modes of Relativistic Stars in Slow Rotation Limit, Astrophysical Journal, 414(1), 247-253, 19930901
  15. Numerical construction of magnetosphere with relativistic two-fluid plasma flows, MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 398(1), 271-279, 20090901
  16. DECIGO and DECIGO pathfinder, CLASSICAL AND QUANTUM GRAVITY, 27(8), 20100421
  17. Measuring neutron star mass and radius with three mass-radius relations, Monthly Notices of the Royal Astronomical Society, 374(1), 232-236, 20070101
  18. DECIGO pathfinder, CLASSICAL AND QUANTUM GRAVITY, 26(9), 20090507
  19. Spin period evolution of a recycled pulsar in an accreting binary, ASTRONOMY & ASTROPHYSICS, 526, 201102
  20. KICK VELOCITY INDUCED BY MAGNETIC DIPOLE AND QUADRUPOLE RADIATION, ASTROPHYSICAL JOURNAL, 728(2), 20110220
  21. The Japanese space gravitational wave antenna: DECIGO, CLASSICAL AND QUANTUM GRAVITY, 28(9), 20110507
  22. Amplification of azimuthal modes with odd wave numbers during dynamical bar-mode growth in rotating stars, PHYSICAL REVIEW D, 78(12), 200812
  23. Relativistic magnetic reconnection at X-type neutral points, ASTRONOMY & ASTROPHYSICS, 531, 201107
  24. The correlation of black hole mass with metallicity index of host spheroid, MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 390(2), 814-818, 20081021
  25. Collimation of a spherical collisionless particles stream in Kerr spacetime, CLASSICAL AND QUANTUM GRAVITY, 26(8), 20090421
  26. MULTI-WAVELENGTH EMISSION REGION OF gamma-RAY EMITTING PULSARS, ASTROPHYSICAL JOURNAL, 739(1), 20110920
  27. The Growth of Purely Axial Dispacements through Radiation Reaction in Neutron Stars, Progress of Theoretical Physics, 107(4), 717-729, 20020401
  28. Mass-dependent evolution of the relation between the supermassive black hole mass and host spheroid mass since z similar to 1, MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 405(2), 1285-1292, 20100621
  29. Discrimination of Quark Stars from Neutron Stars in Quadrupole Oscillations, Progress of Theoretical Physics, 108(5), 801-808, 20020401
  30. Some Properties of an Axisymmetric Pulsar Magnetosphere Constructed by Numerical Calculation, Progress of Theoretical Physics, 109(4), 619-630, 20030401
  31. Stationary electromagnetic fields in the exterior of a slowly rotating relativistic star: a description beyond the low-frequency approximation, Monthly Notices of the Royal Astronomical Society, 348(4), 388-1394, 20040401
  32. Yasufumi Kojima and Taishi Okita, Astrophysical Journal, 614, 922-928, 20040401
  33. Coincidence analysis to search for inspiraling compact binaries using TAMA300 and LISM data, Physical Review, D70, 042003-1-17, 20040401
  34. On the Oscillation Spectra of Ultra Compact Stars; an extensive survey of gravitational-wave modes, Astrophysical Journal, 462(1), 855-864, 19960501
  35. Evolution of Close Neutron Star Binaries, Progress of Theoretical Physics, 96(5), 901-916, 19961101
  36. Gravitational Correction in Neutrino Oscillations, Modern Physics Letters, A11(38), 2965-2970, 19961201
  37. Accuracy of the relativistic Cowling approximation in slowly rotating stars, Monthly Notices of the Royal Astronomical Society, 289, 117-122, 19970401
  38. The Rotational Effects of General Relativity on the Stellar Pulsations, Progress of Theoretical Physics, Suppl(128), 251-293, 19970401
  39. Asymmetry in Microlensing-Induced Light Curves, Progress of Theoretical Physics, 101(4), 885-901, 19990401
  40. The R-Mode Oscillations in Relativistic Rotating Stars, Astrophysical Journal, 520(1), 788-796, 19990801
  41. Gravitational Waves from Relativistic Stars, Progress of Theoretical Physics, Suppl(136), 135-145, 19990401
  42. Flattening modulus of a neutron star by rotation and magnetic field, Astronomy and Astrophysics Supplement Series, 356, 234-237, 20000401
  43. Stability of Relativistic Blast Waves, Progress of Theoretical Physics, 103(3), 549-558, 20000301
  44. Approximate equation relevant to axial oscillations on slowly rotating relativistic stars, Physical Review, D62, 04006-1-04006-11, 20000401
  45. Profiles and Polarization Properties of Emission Lines from Relativistic Disks, Publication of the Astronomical Society of Japan, 52(5), 841-845, 20000401
  46. General Relativistic Modification of a Pulsar Electromagnetic Field, Progress of Theoretical Physics, 104, 1117-1127, 20000401
  47. THE FIRST SEARCH FORGRAVITATIONAL WAVES FROM INSPIRALING COMPACT BINARIES USINGTAMA300 DATA, Physical Review, D63, 062001-1-062001-5, 20010401
  48. A Method of Determining Apparent Horizons in Three-dimensionalNumerical Relativity, Physics Letters, 106A(5-6), 235-238, 19841001
  49. Two Families of Normal Modes in Relativistic Stars, Progress of Theoretical Physics, 79(3), 665-675, 19880301
  50. Early Growth of Cosmological Inhomogeneity at the Horizon Scale, Physical Review, D50(10), 6110-6114, 19941101
  51. Emission Line Profiles of Accretion Disks with Non-axisymmetric Pattern, Publication of the Astronomical Society of Japan, 46(6), 605-611, 19940401
  52. Coupled Pulsation between Polar and Axial Modes in a Slowly Rotating Relativistic Star, Progress of Theoretical Physics, 90(5), 977-990, 19931101
  53. Line Profiles Emitted from an Accretion Torus, Monthly Notices of the Royal Astronomical Society, 256(4), 679-684, 19920601
  54. Non-radial Pulsation of Boson stars I. Formulation, Progress of Theoretical Physics, 86(2), 401-410, 19910801
  55. The Surface Wave Instability of Stratified Incompressible Cylinders with Differential Rotation, Progress of Theoretical Physics, 82(3), 523-534, 19890901
  56. Effects of entropy distributions on non-axisymmetric unstable modes in differentially rotating tori and cylinders, Monthly Notices of the Royal Astronomical Society, 238(2), 753-768, 19890501
  57. Nonaxisymmetric unstable modes of a differentially rotating torus, Monthly Notices of the Royal Astronomical Society, 236(3), 589-602, 19890201
  58. Stellar Resonant Oscillations Coupled to Gravitational Waves, Progress of Theoretical Physics, 77(2), 297-309, 19870201
  59. Apparent Horizons of Time-symmetric Initial Value for Three Black Holes, Physics Letters, A107(9), 452-455, 19850301
  60. Gravitational Radiation from a Particle Scattered by a Kerr Black Hole, Progress of Theoretical Physics, 72(3), 494-504, 19840901
  61. Gravitational Radiation from a Particle with Orbital Angular Momentum Falling into a Kerr Black Hole, Progress of Theoretical Physics, 71(1), 79-90, 19840101
  62. Gravitational Radiation by a Particle with Nonzero OrbitalAngular Momentum Falling into a Kerr Black Hole, Physics Letters, 99A(1), 37-40, 19830101
  63. Gravitational Radiation from a Particle with Zero OrbitalAngular Momentum Plunging into a Kerr Black Hole, Physics Letters, 96A(7), 335-338, 19830701
  64. Nonrelativistic and Relativistic Treatments for Propagation of Torsional Resonant Alfven Waves in Strongly Magnetized Neutron Stars,, Prog. Theor. Phys., 119(1), 39-58, 20080101
  65. Faraday resonance in dynamical bar instability of differentially rotating stars, Phys. Rev. D, D77, 063002-12, 20080315
  66. The Japanese space gravitational wave antenna DECIGO, Classical and Quantum Gravity, 23(6), S125-S132, 20060421
  67. Stability of relativistic blast waves, PROGRESS OF THEORETICAL PHYSICS, 103(3), 549-558, 200003
  68. Approximate equation relevant to axial oscillations on slowly rotating relativistic stars, PHYSICAL REVIEW D, 62(4), art. no.-044006, 20000815
  69. Profiles and polarization properties of emission lines from relativistic disks, PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN, 52(5), 841-845, 2000
  70. General relativistic modification of a pulsar electromagnetic field, PROGRESS OF THEORETICAL PHYSICS, 104(6), 1117-1127, 200012
  71. First search for gravitational waves from inspiraling compact binaries using TAMA300 data, PHYSICAL REVIEW D, 63(6), 20010315
  72. Stable operation of a 300-m laser interferometer with sufficient sensitivity to detect gravitational-wave events within our galaxy, PHYSICAL REVIEW LETTERS, 86(18), 3950-3954, 20010430
  73. Development of a light source with an injection-locked Nd : YAG laser and a ring-mode cleaner for the TAMA 300 gravitational-wave detector, REVIEW OF SCIENTIFIC INSTRUMENTS, 73(5), 2136-2142, 200205
  74. The growth of purely axial displacements through radiation reaction in neutron stars, PROGRESS OF THEORETICAL PHYSICS, 107(4), 717-729, 200204
  75. Discrimination of quark stars from neutron stars in quadrupole oscillations, PROGRESS OF THEORETICAL PHYSICS, 108(5), 801-808, 200211
  76. Some properties of an axisymmetric pulsar magnetosphere constructed by numerical calculation, PROGRESS OF THEORETICAL PHYSICS, 109(4), 619-630, 200304
  77. Development of a multistage laser frequency stabilization for an interferometric gravitational-wave detector, REVIEW OF SCIENTIFIC INSTRUMENTS, 74(9), 4176-4183, 200309
  78. Stationary electromagnetic fields in the exterior of a slowly rotating relativistic star: a description beyond the low-frequency approximation, MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 348(4), 1388-1394, 20040311
  79. Propagation and transmission of Alfven waves in rotating magnetars, ASTROPHYSICAL JOURNAL, 614(2), 922-928, 20041020
  80. Coincidence analysis to search for inspiraling compact binaries using TAMA300 and LISM data, PHYSICAL REVIEW D, 70(4), 200408
  81. Observation results by the TAMA300 detector on gravitational wave bursts from stellar-core collapses, PHYSICAL REVIEW D, 71(8), 200504
  82. Resonant growth of stellar oscillations by incident gravitational waves, CLASSICAL AND QUANTUM GRAVITY, 22(14), 2991-2999, 20050721
  83. Behaviour of torsional Alfven waves and field line resonance on rotating magnetars, MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 364(3), 879-890, 20051211
  84. Upper limits from the LIGO and TAMA detectors on the rate of gravitational-wave bursts, PHYSICAL REVIEW D, 72(12), 200512
  85. The bottom magnetic field and magnetosphere evolution of neutron star in low-mass X-ray binary, MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 366(1), 137-143, 20060211
  86. Tidal effects on magnetic gyration of a charged particle in Fermi coordinates, CLASSICAL AND QUANTUM GRAVITY, 23(3), 609-616, 20060207
  87. The Japanese space gravitational wave antenna - DECIGO, CLASSICAL AND QUANTUM GRAVITY, 23(8), S125-S131, 20060421
  88. Joint LIGO and TAMA300 search for gravitational waves from inspiralling neutron star binaries, PHYSICAL REVIEW D, 73(10), 200605
  89. Measuring neutron star mass and radius with three mass-radius relations, MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 374(1), 232-236, 200701
  90. Results of the search for inspiraling compact star binaries from TAMA300's observation in 2000-2004, PHYSICAL REVIEW D, 74(12), 200612
  91. Nonrelativistic and relativistic treatments for propagation of torsional resonant alfven waves in strongly magnetized neutron stars, PROGRESS OF THEORETICAL PHYSICS, 119(1), 39-58, 200801
  92. Faraday resonance in dynamical bar instability of differentially rotating stars, PHYSICAL REVIEW D, 77(6), 200803
  93. Magnetic field decay with Hall drift in neutron star crusts, MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 421(3), 2722-2730, 201204
  94. Regular and chaotic orbits near a massive magnetic dipole, CLASSICAL AND QUANTUM GRAVITY, 30(2), 20130121
  95. Numerical simulation of oscillating magnetospheres with resistive electrodynamics, PROGRESS OF THEORETICAL AND EXPERIMENTAL PHYSICS, 201402
  96. Outgoing electromagnetic power induced from pair plasma falling into a rotating black hole, MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 454(4), 3902-3911, 20151221
  97. d Axisymmetric force-free magnetosphere in the exterior of a neutron star, MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 468(2), 2011-2016, 201706
  98. Construction of KAGRA: an underground gravitational-wave observatory, PROGRESS OF THEORETICAL AND EXPERIMENTAL PHYSICS, 201801
  99. Axisymmetric force-free magnetosphere in the exterior of a neutron star - II. Maximum storage and open field energies, MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 475(4), 5290-5295, 201804
  100. Prospects for observing and localizing gravitational-wave transients with Advanced LIGO, Advanced Virgo and KAGRA, LIVING REVIEWS IN RELATIVITY, 21, 20180426
  101. Light rays and wave fronts in strong gravity, CONTRIBUTIONS OF THE ASTRONOMICAL OBSERVATORY SKALNATE PLESO, 48(3), 446-455, 2018
  102. Twisted magnetosphere with quadrupolar fields in the exterior of a neutron star, MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 477(3), 3530-3538, 201807
  103. The Japanese space gravitational wave antenna - DECIGO, CLASSICAL AND QUANTUM GRAVITY, 23(8), S125-S131, 2006
  104. The Japanese space gravitational wave antenna - DECIGO, CLASSICAL AND QUANTUM GRAVITY, 23(8), S125-S131, 2006
  105. The Japanese space gravitational wave antenna - DECIGO, CLASSICAL AND QUANTUM GRAVITY, 23(8), S125-S131, 2006