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Theoretical prediction for the spin of primordial black holes

Research Project

Project/Area Number 19K03876
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 15010:Theoretical studies related to particle-, nuclear-, cosmic ray and astro-physics
Research InstitutionRikkyo University

Principal Investigator

Harada Tomohiro  立教大学, 理学部, 教授 (60402773)

Project Period (FY) 2019-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2022: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2021: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2020: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2019: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Keywordsブラックホール / インフレーション宇宙論 / スピン / 重力波 / ビッグバン宇宙論 / 一般相対論 / 重力崩壊 / 初期宇宙 / 原始ブラックホール / 原始ゆらぎ / 宇宙論的摂動 / 回転ブラックホール
Outline of Research at the Start

初期宇宙ではインフレーション起源のゆらぎが重力崩壊することで原始ブラックホールができると考えられている。本研究では、インフレーション後の輻射優勢期における原始ブラックホール形成過程において、ブラックホールがどのようにそしてどれだけの角運動量を獲得するのかについて明らかにする。具体的には、一般相対論的な長波長解の非線形性の解析によって、形成される原始ブラックホールのスピンの評価を行う。そして、LIGO重力波イベントの源としての原始ブラックホール説や暗黒物質としての原始ブラックホール説に対する理論的な示唆を与える。

Outline of Final Research Achievements

During the period of this research project, we published three papers in the international refereed journals. In the first one, correcting an error in the preceding paper, we have shown that the nondimensional Kerr parameter of primordial black holes (PBHs) formed in the radiation-dominated era is of the order of 0.001. In the second, we have derived the statistical properties of PBH binaries, such as the correlation functions between the effective spin parameter, mass ratio and Chirp mass. In the third, motivated by the QCD phase transition, we extended this analysis to the equations of state softer than radiation and showed that the spins of PBHs become larger than those formed in the radiation domination.

Academic Significance and Societal Importance of the Research Achievements

宇宙はどのように生まれたのかという問いは全人類共通の謎である。この問いに実証的に答えるには、宇宙の過去の姿を伝える化石を調べていくのが正攻法であろう。そこで重力波観測の進展に相まって注目されているのが原始ブラックホールである。原始ブラックホールという化石から宇宙の過去の姿を知る上ではその理論的研究が欠かせない。我々の研究成果は、現在続々と見つかっているブラックホール連星の起源が原始ブラックホールなのかどうかを観測的に決定づける上で基礎的な理論を与えるものである。

Report

(6 results)
  • 2023 Annual Research Report   Final Research Report ( PDF )
  • 2022 Research-status Report
  • 2021 Research-status Report
  • 2020 Research-status Report
  • 2019 Research-status Report
  • Research Products

    (78 results)

All 2024 2023 2022 2021 2020 2019 Other

All Int'l Joint Research (8 results) Journal Article (31 results) (of which Int'l Joint Research: 9 results,  Peer Reviewed: 31 results,  Open Access: 13 results) Presentation (36 results) (of which Int'l Joint Research: 21 results,  Invited: 8 results) Book (1 results) Remarks (1 results) Funded Workshop (1 results)

  • [Int'l Joint Research] Ahmedabad University/Charusat University/IIT Kharagpur(インド)

    • Related Report
      2023 Annual Research Report
  • [Int'l Joint Research] Dalhousie University(カナダ)

    • Related Report
      2023 Annual Research Report
  • [Int'l Joint Research] IBS(韓国)

    • Related Report
      2022 Research-status Report
  • [Int'l Joint Research] QMUL(英国)

    • Related Report
      2022 Research-status Report
  • [Int'l Joint Research] IIT Dharwad(インド)

    • Related Report
      2020 Research-status Report
  • [Int'l Joint Research] 湖南師範大学(中国)

    • Related Report
      2020 Research-status Report
  • [Int'l Joint Research] Chalmers University of Technology(スウェーデン)

    • Related Report
      2019 Research-status Report
  • [Int'l Joint Research] Universidade de Lisboa(ポルトガル)

    • Related Report
      2019 Research-status Report
  • [Journal Article] Relativistic orbits of S2 star in the presence of scalar field2024

    • Author(s)
      Bambhaniya Parth、Joshi Ashok B.、Dey Dipanjan、Joshi Pankaj S.、Mazumdar Arindam、Harada Tomohiro、Nakao Ken-ichi
    • Journal Title

      The European Physical Journal C

      Volume: 84 Issue: 2 Pages: 124-124

    • DOI

      10.1140/epjc/s10052-024-12477-3

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Periapsis shifts in dark matter distribution around a black hole2023

    • Author(s)
      Takahisa Igata, Tomohiro Harada, Hiromi Saida, Yohsuke Takamori
    • Journal Title

      International Journal of Modern Physics D

      Volume: 32 Issue: 16 Pages: 2350105-2350105

    • DOI

      10.1142/s0218271823501055

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed
  • [Journal Article] General formulae for the periapsis shift of a quasi-circular orbit in static spherically symmetric spacetimes and the active gravitational mass density2023

    • Author(s)
      Tomohiro Harada, Takahisa Igata, Hiromi Saida, Yohsuke Takamori
    • Journal Title

      International Journal of Modern Physics D

      Volume: 32 Issue: 15 Pages: 2350098-2350098

    • DOI

      10.1142/s0218271823500980

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Spins of primordial black holes formed with a soft equation of state2023

    • Author(s)
      Saito Daiki、Harada Tomohiro、Koga Yasutaka、Yoo Chul-Moon
    • Journal Title

      Journal of Cosmology and Astroparticle Physics

      Volume: 2023 Issue: 07 Pages: 030-030

    • DOI

      10.1088/1475-7516/2023/07/030

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Revisiting compaction functions for primordial black hole formation2023

    • Author(s)
      Harada Tomohiro、Yoo Chul-Moon、Koga Yasutaka
    • Journal Title

      Physical Review D

      Volume: 108 Issue: 4 Pages: 1-8

    • DOI

      10.1103/physrevd.108.043515

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Hairy black holes in AdS with Robin boundary conditions2023

    • Author(s)
      Harada Tomohiro、Ishii Takaaki、Katagiri Takuya、Tanahashi Norihiro
    • Journal Title

      Journal of High Energy Physics

      Volume: 202306 Issue: 6 Pages: 106-106

    • DOI

      10.1007/jhep06(2023)106

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Radiative gravastar with thermal spectrum: Sudden vacuum condensation without gravitational collapse2023

    • Author(s)
      Nakao Ken-ichi、Okabayashi Kazumasa、Harada Tomohiro
    • Journal Title

      Physical Review D

      Volume: 107 Issue: 8 Pages: 1-11

    • DOI

      10.1103/physrevd.107.084036

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Threshold of primordial black hole formation against velocity dispersion in matter-dominated era2023

    • Author(s)
      Harada Tomohiro、Kohri Kazunori、Sasaki Misao、Terada Takahiro、Yoo Chul-Moon
    • Journal Title

      Journal of Cosmology and Astroparticle Physics

      Volume: 2023 Issue: 02 Pages: 038-038

    • DOI

      10.1088/1475-7516/2023/02/038

    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Radiative gravastar with Gibbons-Hawking temperature2022

    • Author(s)
      Nakao Ken-ichi、Okabayashi Kazumasa、Harada Tomohiro
    • Journal Title

      Physical Review D

      Volume: 106 Issue: 10 Pages: 105006-105006

    • DOI

      10.1103/physrevd.106.105006

    • Related Report
      2022 Research-status Report
    • Peer Reviewed
  • [Journal Article] Effective Inspiral Spin Distribution of Primordial Black Hole Binaries2022

    • Author(s)
      Koga Yasutaka、Harada Tomohiro、Tada Yuichiro、Yokoyama Shuichiro、Yoo Chul-Moon
    • Journal Title

      The Astrophysical Journal

      Volume: 939 Issue: 2 Pages: 65-65

    • DOI

      10.3847/1538-4357/ac93f1

    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Conformally Schwarzschild cosmological black holes2022

    • Author(s)
      Sato Takuma、Maeda Hideki、Harada Tomohiro
    • Journal Title

      Classical and Quantum Gravity

      Volume: 39 Issue: 21 Pages: 215011-215011

    • DOI

      10.1088/1361-6382/ac902f

    • Related Report
      2022 Research-status Report
    • Peer Reviewed
  • [Journal Article] Criteria for energy conditions2022

    • Author(s)
      Maeda Hideki、Harada Tomohiro
    • Journal Title

      Classical and Quantum Gravity

      Volume: 39 Issue: 19 Pages: 195002-195002

    • DOI

      10.1088/1361-6382/ac8861

    • Related Report
      2022 Research-status Report
    • Peer Reviewed
  • [Journal Article] Thakurta metric does not describe a cosmological black hole2022

    • Author(s)
      Harada Tomohiro、Maeda Hideki、Sato Takuma
    • Journal Title

      Physics Letters B

      Volume: 833 Pages: 137332-137332

    • DOI

      10.1016/j.physletb.2022.137332

    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Primordial black hole formation from massless scalar isocurvature2022

    • Author(s)
      Yoo Chul-Moon、Harada Tomohiro、Hirano Shin’ichi、Okawa Hirotada、Sasaki Misao
    • Journal Title

      Physical Review D

      Volume: 105 Issue: 10 Pages: 103538-103538

    • DOI

      10.1103/physrevd.105.103538

    • Related Report
      2022 Research-status Report
    • Peer Reviewed
  • [Journal Article] Complete classification of Friedmann-Lema^tre-Robertson-Walker solutions with linear equation of state: parallelly propagated curvature singularities for general geodesics2022

    • Author(s)
      Harada Tomohiro、Igata Takahisa、Sato Takuma、Carr Bernard
    • Journal Title

      Classical and Quantum Gravity

      Volume: 39 Issue: 14 Pages: 145008-145008

    • DOI

      10.1088/1361-6382/ac776e

    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Robustness of particle creation in the formation of a compact object2022

    • Author(s)
      Kazumasa Okabayashi, Tomohiro Harada, Ken-ichi Nakao
    • Journal Title

      PTEP 2022 (2022) 2, 023E02

      Volume: 2 Issue: 2 Pages: 1-18

    • DOI

      10.1093/ptep/ptac006

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Backreaction of mass and angular momentum accretion on black holes: General formulation of metric perturbations and application to the Blandford-Znajek process2021

    • Author(s)
      Kimura Masashi、Harada Tomohiro、Naruko Atsushi、Toma Kenji
    • Journal Title

      Progress of Theoretical and Experimental Physics

      Volume: 2021 Issue: 9 Pages: 1-26

    • DOI

      10.1093/ptep/ptab101

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Stability of small charged anti-de Sitter black holes in the Robin boundary2021

    • Author(s)
      Katagiri Takuya、Harada Tomohiro
    • Journal Title

      Classical and Quantum Gravity

      Volume: 38 Issue: 13 Pages: 135026-135026

    • DOI

      10.1088/1361-6382/abfed6

    • Related Report
      2021 Research-status Report
    • Peer Reviewed
  • [Journal Article] Spins of Primordial Black Holes Formed in the Radiation-dominated Phase of the Universe: First-order Effect2021

    • Author(s)
      Harada Tomohiro、Yoo Chul-Moon、Kohri Kazunori、Koga Yasutaka、Monobe Takeru
    • Journal Title

      The Astrophysical Journal

      Volume: 908 Issue: 2 Pages: 140-140

    • DOI

      10.3847/1538-4357/abd9b9

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] The First Three Seconds: a Review of Possible Expansion Histories of the Early Universe2021

    • Author(s)
      Allahverdi Rouzbeh、... Takahashi Tomo、.... et al
    • Journal Title

      The Open Journal of Astrophysics

      Volume: 4 Issue: 1 Pages: 1-1

    • DOI

      10.21105/astro.2006.16182

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Abundance of primordial black holes in peak theory for an arbitrary power spectrum2020

    • Author(s)
      Yoo Chul-Moon、Harada Tomohiro、Hirano Shin’ichi、Kohri Kazunori
    • Journal Title

      Progress of Theoretical and Experimental Physics

      Volume: 2021 Issue: 1 Pages: 1300-1300

    • DOI

      10.1093/ptep/ptaa155

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Thin-Shell Wormholes in Einstein and Einstein-Gauss-Bonnet Theories of Gravity2020

    • Author(s)
      Kokubu Takafumi、Harada Tomohiro
    • Journal Title

      Universe

      Volume: 6 Issue: 11 Pages: 197-197

    • DOI

      10.3390/universe6110197

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Sonic point and photon surface2020

    • Author(s)
      Tsuchiya Masataka、Yoo Chul-Moon、Koga Yasutaka、Harada Tomohiro
    • Journal Title

      Physical Review D

      Volume: 102 Issue: 4 Pages: 044057-044057

    • DOI

      10.1103/physrevd.102.044057

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Extremal Kerr white holes as a source of ultrahigh energy particles2020

    • Author(s)
      Patil Mandar、Harada Tomohiro
    • Journal Title

      Physical Review D

      Volume: 102 Issue: 2

    • DOI

      10.1103/physrevd.102.024002

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Threshold of primordial black hole formation in nonspherical collapse2020

    • Author(s)
      Yoo Chul-Moon、Harada Tomohiro、Okawa Hirotada
    • Journal Title

      Physical Review D

      Volume: 102 Issue: 4

    • DOI

      10.1103/physrevd.102.043526

    • Related Report
      2020 Research-status Report
    • Peer Reviewed
  • [Journal Article] Dynamical transition from a naked singularity to a black hole2020

    • Author(s)
      Hioki Kenta、Harada Tomohiro
    • Journal Title

      International Journal of Modern Physics A

      Volume: 35 Issue: 31 Pages: 2050201-2050201

    • DOI

      10.1142/s0217751x20502012

    • Related Report
      2020 Research-status Report
    • Peer Reviewed
  • [Journal Article] Uniqueness of static, isotropic low- pressure solutions of the Einstein-Vlasov system2020

    • Author(s)
      Tomohiro Harada, Maximilian Thaller
    • Journal Title

      Lett. Math. Phys.

      Volume: 110 Issue: 7 Pages: 1877-1901

    • DOI

      10.1007/s11005-020-01284-y

    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Escape probability of a photon emitted near the black hole horizon2020

    • Author(s)
      Kota Ogasawara, Takahisa Igata, Tomohiro Harada, Umpei Miyamoto
    • Journal Title

      Physical Review D

      Volume: 101 Issue: 4 Pages: 1-11

    • DOI

      10.1103/physrevd.101.044023

    • Related Report
      2019 Research-status Report
    • Peer Reviewed
  • [Journal Article] Bursts of particle creation in gravitational collapse to a horizonless compact object2019

    • Author(s)
      Kokubu Takafumi、Harada Tomohiro
    • Journal Title

      Physical Review D

      Volume: 100 Issue: 8

    • DOI

      10.1103/physrevd.100.084028

    • Related Report
      2019 Research-status Report
    • Peer Reviewed
  • [Journal Article] Stability of null orbits on photon spheres and photon surfaces2019

    • Author(s)
      Koga Yasutaka、Harada Tomohiro
    • Journal Title

      Physical Review D

      Volume: 100 Issue: 6

    • DOI

      10.1103/physrevd.100.064040

    • Related Report
      2019 Research-status Report
    • Peer Reviewed
  • [Journal Article] Particle creation in gravitational collapse to a horizonless compact object2019

    • Author(s)
      Harada Tomohiro、Cardoso Vitor、Miyata Daiki
    • Journal Title

      Physical Review D

      Volume: 99 Issue: 4

    • DOI

      10.1103/physrevd.99.044039

    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Presentation] Revisiting compaction functions for primordial black hole formation2024

    • Author(s)
      Tomohiro Harada
    • Organizer
      Gravity and Cosmology 2024
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 零質量スカラー場系における定常軸対称解について2024

    • Author(s)
      原田知広
    • Organizer
      ブラックホール 磁気圏研究会 2024
    • Related Report
      2023 Annual Research Report
  • [Presentation] Primordial black hole formation from cosmological perturbations: recent developments2023

    • Author(s)
      Tomohiro Harada
    • Organizer
      Future Perspectives on Primordial Black Holes
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Revisiting compaction functions for primordial black hole formation2023

    • Author(s)
      Tomohiro Harada
    • Organizer
      The 32nd Workshop on General Relativity and Gravitation in Japan
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Revisiting compaction functions for primordial black hole formation2023

    • Author(s)
      Tomohiro Harada
    • Organizer
      Focus Week on Primordial Black Holes
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Primordial black hole formation from cosmological perturbations2023

    • Author(s)
      Tomohiro Harada
    • Organizer
      Gravitational Wave Probes of Physics Beyond Standard Model
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Periapsis shift of a quasi-circular orbit in a static spherically symmetric spacetime and the active gravitational mass density2023

    • Author(s)
      Tomohiro Harada
    • Organizer
      Black Hole and Gravitational Waves -- from modified theories of gravity to data analysis --
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] The periapsis shift of a quasi-circular orbit in a static spherically symmetric spacetime and the active gravitational mass density2023

    • Author(s)
      Tomohiro Harada
    • Organizer
      XV International Conference on Gravitation, Astrophysics and Cosmology (ICGAC15)
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 静的球対称時空における準円軌道の近点移動の一般公式と能動的重力質量密度2023

    • Author(s)
      原田知広
    • Organizer
      日本物理学会第78回年次大会
    • Related Report
      2023 Annual Research Report
  • [Presentation] Periapsis shift of a quasi-circular orbit in static spherically symmetric spacetimes and the active gravitational mass density2023

    • Author(s)
      原田知広
    • Organizer
      第24回特異点研究会
    • Related Report
      2023 Annual Research Report
  • [Presentation] Compaction function revisited2023

    • Author(s)
      Tomohiro Harada
    • Organizer
      Dynamics of Primordial Black Hole Formation
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research
  • [Presentation] 一般的な静的球対称時空における準円軌道の近点移動2023

    • Author(s)
      原田知広、伊形尚久、斉田浩見、孝森洋介
    • Organizer
      日本天文学会2023年春季大会
    • Related Report
      2022 Research-status Report
  • [Presentation] Periapsis shift in a general static spherically symmetric spacetime2022

    • Author(s)
      Tomohiro Harada
    • Organizer
      The 31st Workshop on General Relativity and Gravitation in Japan
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research
  • [Presentation] Complete classification of the FLRW solutions with linear equation of state: p.p. curvature singularities for general geodesics2022

    • Author(s)
      Tomohiro Harada
    • Organizer
      Gravity: Current challenges in black hole physics and cosmology
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research
  • [Presentation] Complete classification of the FLRW solutions with linear equation of state: p.p. curvature singularities for general geodesics2022

    • Author(s)
      Tomohiro Harada
    • Organizer
      The 23rd International Conference on General Relativity and Gravitation
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research
  • [Presentation] Thakurta 計量は宇宙論的ブラックホールを記述しない2022

    • Author(s)
      原田知広、前田秀基、佐藤琢磨
    • Organizer
      日本物理学会2022年秋季大会
    • Related Report
      2022 Research-status Report
  • [Presentation] FLRW解の共形境界の分類:線形状態方程式の場合II2022

    • Author(s)
      原田知広、伊形尚久、佐藤琢磨、Bernard Carr
    • Organizer
      日本物理学会第77回年次大会
    • Related Report
      2021 Research-status Report
  • [Presentation] 静的球対称時空における近点移動2022

    • Author(s)
      原田知広
    • Organizer
      ブラックホール磁気圏研究会2022
    • Related Report
      2021 Research-status Report
  • [Presentation] Spins of primordial black holes formed in the radiation-dominated phase of the universe: first-order effect2021

    • Author(s)
      Tomohiro Harada
    • Organizer
      The 30th Workshop on General Relativity and Gravitation in Japan
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research
  • [Presentation] Spins of primordial black holes formed in the radiation-dominated phase of the universe: first-order effect2021

    • Author(s)
      Tomohiro Harada
    • Organizer
      The KEK-PH + KEK-Cosmo joint workshop on “Primordial Black Holes”
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research
  • [Presentation] FLRW解の共形境界の分類:線形状態方程式の場合2021

    • Author(s)
      原田知広、伊形尚久、佐藤琢磨
    • Organizer
      日本物理学会2021年秋季大会
    • Related Report
      2021 Research-status Report
  • [Presentation] FLRW解の共形分類II2021

    • Author(s)
      原田知広
    • Organizer
      第22回特異点研究会
    • Related Report
      2021 Research-status Report
  • [Presentation] ペンローズ過程と粒子衝突2021

    • Author(s)
      原田知広
    • Organizer
      日本物理学会第76回年次大会
    • Related Report
      2020 Research-status Report
  • [Presentation] 輻射優勢期に形成される原始ブラックホールのスピンII2021

    • Author(s)
      原田知広、柳哲文、郡和範、古賀泰敬、物部武瑠
    • Organizer
      日本物理学会第76回年次大会
    • Related Report
      2020 Research-status Report
  • [Presentation] Primordial Black Holes: Mass and Spin2020

    • Author(s)
      Tomohiro Harada
    • Organizer
      7th Korea-Japan Workshop on Dark Energy: Maeda's Universe
    • Related Report
      2020 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Stability of charged AdS black holes in the Robin boundary2020

    • Author(s)
      Tomohiro Harada
    • Organizer
      Online JGRG workshop 2020
    • Related Report
      2020 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] 輻射優勢期に形成される原始ブラックホールのスピン2020

    • Author(s)
      原田知広、柳哲文、郡和範、古賀泰敬、物部武瑠
    • Organizer
      日本物理学会2020年秋季大会
    • Related Report
      2020 Research-status Report
  • [Presentation] Particle Creation by Horizonless Compact Objects2019

    • Author(s)
      Tomohiro Harada
    • Organizer
      International Workshop on Astrophysics and Cosmology
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Formation of Primordial Black Holes2019

    • Author(s)
      Tomohiro Harada
    • Organizer
      International Workshop on Astrophysics and Cosmology
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Effect of Inhomogeneity on Primordial Black Hole Forma- tion in the Matter Dominated Era2019

    • Author(s)
      Tomohiro Harada
    • Organizer
      Focus Week on Primordial Black Holes
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] Particle creation in gravitational collapse to a horizon- less compact object2019

    • Author(s)
      Tomohiro Harada
    • Organizer
      19th Lomonosov Conference on Elementary Particle Physics
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Particle Creation In Gravitational Collapse To A Horizon- less Compact Object2019

    • Author(s)
      Tomohiro Harada
    • Organizer
      22nd International Conference on General Relativity and Gravitation
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] Particle creation in gravitational collapse to a horizonless compact object2019

    • Author(s)
      Tomohiro Harada
    • Organizer
      29th Workshop on General Relativity and Gravitation in Japan
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] 原始ブラックホールのスピンについて2019

    • Author(s)
      原田知広、柳哲文、郡和範
    • Organizer
      日本物理学会2019年秋季大会
    • Related Report
      2019 Research-status Report
  • [Presentation] 原始ブラックホールの形成2019

    • Author(s)
      原田知広
    • Organizer
      日本物理学会2019年秋季大会
    • Related Report
      2019 Research-status Report
  • [Presentation] 地平面のないコンパクト天体への重力崩壊におけるバースト的粒子生成2019

    • Author(s)
      國分隆文、原田知広
    • Organizer
      日本物理学会2019年秋季大会
    • Related Report
      2019 Research-status Report
  • [Book] 宇宙まるごとQ & A: はやぶさ2からブラックホールまで2021

    • Author(s)
      北本俊二, 原田知広, 亀田真吾
    • Total Pages
      196
    • Publisher
      理工図書
    • Related Report
      2020 Research-status Report
  • [Remarks] 原始ブラックホールについて

    • URL

      https://www2.rikkyo.ac.jp/web/harada/pbh_kaken.pdf

    • Related Report
      2023 Annual Research Report 2022 Research-status Report 2021 Research-status Report
  • [Funded Workshop] Dynamics of primordial black hole formation2023

    • Related Report
      2022 Research-status Report

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Published: 2019-04-18   Modified: 2025-01-30  

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