Nonspherical primordial black hole formation

• Project/Area Number: 16K17688
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Particle/Nuclear/Cosmic ray/Astro physics
• Research Institution: Nagoya University
• Principal Investigator: Yoo Chulmoon 名古屋大学, 理学研究科, 講師 (60467404)
• Project Period (FY): 2016-04-01 – 2020-03-31
• Project Status: Discontinued (Fiscal Year 2019)
• Budget Amount: ¥4,810,000 (Direct Cost: ¥3,700,000、Indirect Cost: ¥1,110,000); Fiscal Year 2019: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000); Fiscal Year 2018: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000); Fiscal Year 2017: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000); Fiscal Year 2016: ¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
• Keywords: 原始ブラックホール / 相対論 / 重力崩壊

Outline of Final Research Achievements

Basic research for simulation of non-spherical primordial black hole formation has been performed, and the development led to the success in the simulation starting from a non-spherical realistic initial data for primordial black hole formation in the beginning of 2020 fiscal year.
The procedure of calculating primordial black hole abundance has been improved much, and it contributed to the progress in estimation of primordial black hole abundance.

Academic Significance and Societal Importance of the Research Achievements

原始ブラックホールは宇宙初期の非線形な非一様性の痕跡で，初期宇宙の状況についての情報が得られる可能性がり，非常に注目されています．本研究における成果は，原始ブラックホールの形成過程と原始ブラックホール量の見積もり方法についての基礎的な事柄についての物であり，原始ブラックホールを用いた様々な研究についてしっかりとした土台を提供する物です．

Research Products

• [Int'l Joint Research] CENTRA, IST, Universidade de Lisboa(ポルトガル)
• [Int'l Joint Research] Perimeter Institute(カナダ)
• [Int'l Joint Research] DAMTP, Centre for Mathematical Sciences(英国)
• [Int'l Joint Research] Universitat de Barcelona(スペイン)
• [Journal Article] Chameleon field in a spherical shell system (2019)
  • Author(s): Nakamura Tomohiro、Ikeda Taishi、Saito Ryo、Yoo Chul-Moon
  • Journal Title: Physical Review D Volume: 99 Issue: 4 Pages: 044024-044024
  • DOI: 10.1103/physrevd.99.044024
  • Peer Reviewed
• [Journal Article] Gravastar formation: What can be the evidence of a black hole? (2019)
  • Author(s): Nakao Ken-ichi、Yoo Chul-Moon、Harada Tomohiro
  • Journal Title: Physical Review D Volume: 99 Issue: 4 Pages: 044027-044027
  • DOI: 10.1103/physrevd.99.044027
  • Peer Reviewed
• [Journal Article] Gravitational collapse of a massless scalar field in a periodic box (2019)
  • Author(s): Yoo Chul-Moon、Ikeda Taishi、Okawa Hirotada
  • Journal Title: Classical and Quantum Gravity Volume: 36 Issue: 7 Pages: 075004-075004
  • DOI: 10.1088/1361-6382/ab06e2
  • Peer Reviewed
• [Journal Article] Remarks on the maximum luminosity (2018)
  • Author(s): Cardoso Vitor、Ikeda Taishi、Moore Christopher J.、Yoo Chul-Moon
  • Journal Title: Physical Review D Volume: 97 Issue: 8 Pages: 084013-084013
  • DOI: 10.1103/physrevd.97.084013
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Primordial black hole abundance from random Gaussian curvature perturbations and a local density threshold (2018)
  • Author(s): Chul-Moon Yoo Tomohiro Harada Jaume Garriga Kazunori Kohri
  • Journal Title: Progress of Theoretical and Experimental Physics Volume: 120 Issue: 12 Pages: 1-1
  • DOI: 10.1093/ptep/pty120
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Rigidly rotating string sticking in a Kerr black hole (2018)
  • Author(s): Igata Takahisa、Ishihara Hideki、Tsuchiya Masataka、Yoo Chul-Moon
  • Journal Title: Physical Review D Volume: 98 Issue: 6 Pages: 064021-064021
  • DOI: 10.1103/physrevd.98.064021
  • Peer Reviewed
• [Journal Article] Observational Constraint on Spherical Inhomogeneity with CMB and Local Hubble Parameter (2018)
  • Author(s): Masato Tokutake, Kiyotomo Ichiki, Chul-Moon Yoo
  • Journal Title: Journal of Cosmology and Astroparticle Physics Volume: 1803 Issue: 03 Pages: 33-33
  • DOI: 10.1088/1475-7516/2018/03/033
  • Peer Reviewed
• [Journal Article] Spins of primordial black holes formed in the matter-dominated phase of the Universe (2017)
  • Author(s): Tomohiro Harada, Chul-Moon Yoo, Kazunori Kohri, Ken-ichi Nakao
  • Journal Title: Physical Review D Volume: 96 Issue: 8 Pages: 083517-083517
  • DOI: 10.1103/physrevd.96.083517
  • Peer Reviewed / Open Access
• [Journal Article] Self-gravitating oscillons and new critical behavior (2017)
  • Author(s): Taishi Ikeda, Chul-Moon Yoo, Vitor Cardoso
  • Journal Title: Physical Review D Volume: 96 Issue: 6 Pages: 064047-064047
  • DOI: 10.1103/physrevd.96.064047
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] 3D Simulation of Spindle Gravitational Collapse of a Collisionless Particle System (2017)
  • Author(s): Chul-Moon Yoo, Tomohiro Harada, Hirotada Okawa
  • Journal Title: Classical an Quantum Gravity Volume: 34 Issue: 10 Pages: 105010-105010
  • DOI: 10.1088/1361-6382/aa6ad5
  • Peer Reviewed
• [Journal Article] Inverse construction of the ΛLTB model from a distance-redshift relation (2016)
  • Author(s): Masato Tokutake, Chul-Moon Yoo
  • Journal Title: JCAP Volume: 10 Issue: 10 Pages: 009-009
  • DOI: 10.1088/1475-7516/2016/10/009
• [Journal Article] Primordial black hole formation in the matter-dominated phase of the Universe (2016)
  • Author(s): T.~Harada, C.~M.~Yoo, K.~Kohri, K.~i.~Nakao and S.~Jhingan
  • Journal Title: Astrophysical Journal Volume: 833 Issue: 1 Pages: 61-61
  • DOI: 10.3847/1538-4357/833/1/61
  • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] Critical behavior of a spherically symmetric domain wall collapse (2016)
  • Author(s): Taishi Ikeda, Chul-Moon Yoo
  • Journal Title: Physical Review D Volume: D94 Issue: 12 Pages: 124032-124032
  • DOI: 10.1103/physrevd.94.124032
• [Presentation] 周期境界条件下での重力崩壊シミュレーション (2019)
  • Author(s): 柳哲文
  • Organizer: 第20回特異点研究会
• [Presentation] On estimation of PBH abundance (2019)
  • Author(s): 柳哲文
  • Organizer: The 2nd NRF-JSPS workshop in particle physics, cosmology, and gravitation
  • Int'l Joint Research
• [Presentation] On estimation of PBH abundance (2019)
  • Author(s): 柳哲文
  • Organizer: The 2nd Korea-Japan bilateral workshop on String Axion Cosmology
  • Int'l Joint Research / Invited
• [Presentation] Gravitational Collapse of a Massless Scalar Field in a Periodic Box (2019)
  • Author(s): 柳哲文
  • Organizer: 物理学会（春）
• [Presentation] Possible resolution of a spacetime singularity with field transformations (2019)
  • Author(s): 柳哲文
  • Organizer: The 2nd Workshop on "Mathematics and Physics in General Relativity"
• [Presentation] Estimation of PBH abundance (2018)
  • Author(s): 柳哲文
  • Organizer: The first NRF-JSPS workshop in particle physics, cosmology, and gravitation
  • Int'l Joint Research / Invited
• [Presentation] Gravitational Collapse of a Massless Scalar Field in a Periodic Box (2018)
  • Author(s): 柳哲文
  • Organizer: "YITP International Molecule-type Workshop ""Dynamics in Strong Gravity Universe"""
  • Int'l Joint Research
• [Presentation] PBH abundance from the random Gaussian curvature perturbation and a local density threshold (2018)
  • Author(s): 柳哲文
  • Organizer: The 28th Workshop on General Relativity and Gravitation in Japan
  • Int'l Joint Research
• [Presentation] PBH abundance from the random Gaussian curvature perturbation and a local density threshold (2018)
  • Author(s): 柳哲文
  • Organizer: Gravity and Cosmology 2018
  • Int'l Joint Research
• [Presentation] PBH abundance from the random Gaussian curvature perturbation and a local density threshold (2018)
  • Author(s): 柳哲文
  • Organizer: YKIS2018a Symposium
  • Int'l Joint Research
• [Presentation] PBH abundance from the random Gaussian curvature perturbation and a local density threshold (2018)
  • Author(s): 柳哲文
  • Organizer: 山口大学重力宇宙論研究会2018
• [Presentation] Rigidly Rotating Co-homogeneity-1 Strings in the Kerr Spacetime (2018)
  • Author(s): 柳哲文
  • Organizer: 物理学会（春）
• [Presentation] Gravitational Collapse of Gravitational Waves (2017)
  • Author(s): 柳哲文
  • Organizer: The origin and Evolution of the Universe
  • Int'l Joint Research / Invited
• [Presentation] Gravitational Collapse of Massless Fields in an Expanding Universe (2017)
  • Author(s): 柳哲文
  • Organizer: International Conference on Gravitation: Joint Conference ICGAC-XIII and IK15
  • Int'l Joint Research
• [Presentation] 膨張宇宙背景におけるスカラー場の重力崩壊 (2017)
  • Author(s): 柳哲文
  • Organizer: 相対論宇宙論東北研究会2017
• [Presentation] Gravitational Collapse of Massless fiels in an Expanding Universe (2017)
  • Author(s): 柳哲文
  • Organizer: 物理学会（秋）
• [Presentation] Rigidly Rotating Co-homogeneity-1 Strings in the Kerr Spacetime (2017)
  • Author(s): 柳哲文
  • Organizer: Grvitational Dynamics and Black Holes
  • Int'l Joint Research
• [Presentation] PBH abundance from the random Gaussian curvature perturbation and a local density threshold (2017)
  • Author(s): 柳哲文
  • Organizer: The 27th Workshop on General Relativity and Gravitation in Japan
  • Int'l Joint Research
• [Presentation] PBH abundance from the random Gaussian curvature perturbation and a local density threshold (2017)
  • Author(s): 柳哲文
  • Organizer: 第１９回特異点研究会
• [Presentation] 膨張宇宙背景における非線形重力波の重力崩壊 (2017)
  • Author(s): 柳哲文
  • Organizer: 新学術領域A05班合宿
  • Place of Presentation: 湖邸滋びわこクラブ
• [Presentation] 3D Simulation of Non-Spherical Gravitational Collapse of a Collisionless Particle System (2017)
  • Author(s): 柳哲文
  • Organizer: Geometric Transport Equations in General Relativity
  • Place of Presentation: Erwin Schrodinger International Institute for Mathematics and Physics, Vienna
  • Int'l Joint Research
• [Presentation] 無衝突粒子系のスピンドル重力崩壊 (2017)
  • Author(s): 柳哲文
  • Organizer: 若手による重力・宇宙論研究会
  • Place of Presentation: 京都大学基礎物理学研究所
• [Presentation] 膨張宇宙背景における非線形重力波の重力崩壊 (2017)
  • Author(s): 柳哲文
  • Organizer: 物理学会（春）
  • Place of Presentation: 大阪大学
• [Presentation] Towards Simulation of Non-spherical PBH Formation (2016)
  • Author(s): 柳哲文
  • Organizer: Miniworkshop on Cosmology
  • Place of Presentation: 韓国浦項APCTP
  • Int'l Joint Research / Invited
• [Presentation] 無衝突粒子系のスピンドル重力崩壊 (2016)
  • Author(s): 柳哲文
  • Organizer: 五色浜相対論研究会
  • Place of Presentation: 淡路島ウェル五色浜リゾート
• [Presentation] 無衝突粒子系のスピンドル重力崩壊 (2016)
  • Author(s): 柳哲文
  • Organizer: 物理学会（秋）
  • Place of Presentation: 宮崎大学
• [Presentation] Non-spherical Gravitational Collapse of a Collisionless (2016)
  • Author(s): 柳哲文
  • Organizer: Workshop on Particle Physics, Cosmology, and Gravitation
  • Place of Presentation: 東京工業大学
  • Int'l Joint Research
• [Presentation] Non-spherical Gravitational Collapse of a Collisionless Particle System (2016)
  • Author(s): 柳哲文
  • Organizer: The 26th Workshop on General Relativity and Gravitation in Japan
  • Place of Presentation: 大阪市立大学
  • Int'l Joint Research
• [Presentation] 3D Simulation of Non-Spherical Gravitational Collapse of a Collisionless Particle System (2016)
  • Author(s): 柳哲文
  • Organizer: IX Black Hole Workshop
  • Place of Presentation: Guimaraes, Portugal
  • Int'l Joint Research
• [Presentation] Gravitational Collapse of Nonlinear Gravitational Waves in an Expanding Universe (2016)
  • Author(s): 柳哲文
  • Organizer: 第18回特異点研究会
  • Place of Presentation: 立教大学池袋キャンパス
• [Funded Workshop] Grvitational Dynamics and Black Holes (2017)