Theoretical research on methods to measure quantum natures of evaporating primordial black holes by using future observations

• Project Area: The Natural Laws of Extreme Universe--A New Paradigm for Spacetime and Matter from Quantum Information
• Project/Area Number: 22H05270
• Research Category: Grant-in-Aid for Transformative Research Areas (A)
• Allocation Type: Single-year Grants
• Review Section: Transformative Research Areas, Section (II)
• Research Institution: National Astronomical Observatory of Japan (2023); High Energy Accelerator Research Organization (2022)
• Principal Investigator: 郡 和範 国立天文台, 科学研究部, 教授 (50565819)
• Project Period (FY): 2022-06-16 – 2024-03-31
• Project Status: Completed (Fiscal Year 2023)
• Budget Amount: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000); Fiscal Year 2023: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000); Fiscal Year 2022: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
• Keywords: 重力波 / ダークマター / インフレーション / 量子性 / ブラックホール / パルサー / 電波 / NANOGrav / 原始ブラックホール / ホーキング輻射 / ガンマ線 / 量子重力 / 修正重力理論 / バリオン数生成 / ビッグバン元素合成

Outline of Research at the Start

2016年にアメリカのLIGO実験チームにより、重力波の初検出が報告されました。約13億光年先の太陽の約３０倍の重さを持つ双子のブラックホールの衝突によりつくられた重力波でした。その重いブラックホールは宇宙の誕生時のインフレーションが起源となりつくられた原始ブラックホールである可能性があります。また、原始ブラックホールの中にはもっと軽いものがあり、ホーキング輻射を出して量子力学的に蒸発してしまう可能性すらあります。次世代のガンマ線観測などで、ホーキング輻射を観測することにより、ダークマターとしての原始ブラックホールの正体が明らかになるかもしれません。そうした理論準備を進める必要があります。

Outline of Annual Research Achievements

本年度はまとめの年として初期宇宙における原始ブラックホール形成がナノヘルツ帯における背景重力波を生む誘導重力波の機構についての最新の理論を発表した。その内容は次のようなものです。2023年６月末に北アメリカナノヘルツ重力波天文台（NANOGrav）により宇宙初期から存在する背景重力波を観測したというニュースが報じられた。複数のパルサーが周期的に出す電波のシグナルの相関を15年間観測したところ、ナノヘルツ帯の電波に背景重力波特有のシグナルを観測したというものでした。もし背景重力波が存在するとすると正確なパルサーの電波の周期を変更するため重力波のシグナルとして観測されます。この背景重力波は各々の銀河の中心にあるという超巨大ブラックホールの衝突でも生じることが知られていますが今回のシグナルはスペクトルの形が有意に異なります。これはインフレーションが直接つくる大きなスケールの重力波に比べて約1千万倍以上も大きいものです。しかし、もしインフレーションが作る小スケールの密度ゆらぎが大きい場合、密度ゆらぎの非線形の2次的効果により大きな重力波が作られる効果があることが知られています。これが誘導重力波です。我々はこの誘導重力波が観測されるシグナルをぴったり一致することを指摘しました。さらに、その密度ゆらぎが潰れて太陽より軽い原始ブラックホールを生成することが理論的に予想されます。その存在量はダークマターの総量の約1%にも及びます。その軽い原始ブラックホールの連星の衝突時に発する背景重力波を将来計画である欧州のアインシュタイン テレスコープ(ET)や、米国のコズミック エクスプローラー(CE)が見つける可能性があります。そうした将来の重力波実験によりインフラトン場の量子性の検証と原始ブラックホールの発見が期待されます。このことを指摘する査読付き論文を出版することができました。

Research Progress Status

令和5年度が最終年度であるため、記入しない。

Strategy for Future Research Activity

令和5年度が最終年度であるため、記入しない。

Research Products

• [Int'l Joint Research] シカゴ大/UCバークレー/MIT(米国)
• [Int'l Joint Research] IHEP CAS, Beijing/Tsinghua U., Beijing/China, Agriculture U.(中国)
• [Int'l Joint Research] INFN, Florence/Florence U.(イタリア)
• [Int'l Joint Research] MPA/DESY(ドイツ)
• [Int'l Joint Research] Oxford U(英国)
• [Int'l Joint Research]
• [Int'l Joint Research] Yonsei U(韓国)
• [Int'l Joint Research] MPA(ドイツ)
• [Int'l Joint Research] CAS, Beijing(中国)
• [Journal Article] Testing multi-field inflation with LiteBIRD (2024)
  • Author(s): Jinno Ryusuke、Kohri Kazunori、Moroi Takeo、Takahashi Tomo、Hazumi Masashi
  • Journal Title: Journal of Cosmology and Astroparticle Physics Volume: 2024 Issue: 03 Pages: 011-011
  • DOI: 10.1088/1475-7516/2024/03/011
  • Peer Reviewed / Open Access
• [Journal Article] Gravitational Wave Search through Electromagnetic Telescopes (2024)
  • Author(s): Ito Asuka、Kohri Kazunori、Nakayama Kazunori
  • Journal Title: Progress of Theoretical and Experimental Physics Volume: 2024 Issue: 2
  • DOI: 10.1093/ptep/ptae004
  • Peer Reviewed / Open Access
• [Journal Article] Detected stochastic gravitational waves and subsolar-mass primordial black holes (2024)
  • Author(s): Inomata Keisuke、Kohri Kazunori、Terada Takahiro
  • Journal Title: Physical Review D Volume: 109 Issue: 6 Pages: 63506-63506
  • DOI: 10.1103/physrevd.109.063506
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Probing high frequency gravitational waves with pulsars (2024)
  • Author(s): Ito Asuka、Kohri Kazunori、Nakayama Kazunori
  • Journal Title: Physical Review D Volume: 109 Issue: 6 Pages: 63026-63026
  • DOI: 10.1103/physrevd.109.063026
  • Peer Reviewed / Open Access
• [Journal Article] Effects of Heat Conduction on Blocking off the Super-Eddington Growth of Black Holes at High Redshift (2023)
  • Author(s): Kawanaka Norita、Kohri Kazunori
  • Journal Title: The Astrophysical Journal Volume: 955 Issue: 1 Pages: 67-67
  • DOI: 10.3847/1538-4357/acee6d
  • Peer Reviewed / Open Access
• [Journal Article] Primordial non-Gaussianity fNL and anisotropies in scalar-induced gravitational waves (2023)
  • Author(s): Li Jun-Peng、Wang Sai、Zhao Zhi-Chao、Kohri Kazunori
  • Journal Title: Journal of Cosmology and Astroparticle Physics Volume: 2023 Issue: 10 Pages: 056-056
  • DOI: 10.1088/1475-7516/2023/10/056
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Direct Measurement of the Spectral Structure of Cosmic-Ray Electrons + Positrons in the TeV Region with CALET on the International Space Station (2023)
  • Author(s): O. Adriani, Y. Akaike et al., (CALET Collaboration)
  • Journal Title: Physical Review Letters Volume: 131 Issue: 19 Pages: 191001-191001
  • DOI: 10.1103/physrevlett.131.191001
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Star tracking for pointing determination of Imaging Atmospheric Cherenkov Telescopes (2023)
  • Author(s): K. Abe, et al.
  • Journal Title: Astronomy & Astrophysics Volume: 679 Pages: A90-A90
  • DOI: 10.1051/0004-6361/202347128
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Performance of the joint LST-1 and MAGIC observations evaluated with Crab Nebula data (2023)
  • Author(s): Abe H.、Abe K.、Abe S.、et al.
  • Journal Title: Astronomy & Astrophysics Volume: 680 Pages: A66-A66
  • DOI: 10.1051/0004-6361/202346927
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Charge-Sign Dependent Cosmic-Ray Modulation Observed with the Calorimetric Electron Telescope on the International Space Station (2023)
  • Author(s): Adriani O., Akaike Y., ..., Miyake S., ..., Munakata K. et al. (CALET Collaboration)
  • Journal Title: Physical Review Letters Volume: 130 Issue: 21 Pages: 211001-211001
  • DOI: 10.1103/physrevlett.130.211001
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Direct Measurement of the Cosmic-Ray Helium Spectrum from 40 GeV to 250 TeV with the Calorimetric Electron Telescope on the International Space Station (2023)
  • Author(s): O. Adriani, Y. Akaike et al. (CALET Collaboration)
  • Journal Title: Physical Review Letters Volume: 130 Issue: 17 Pages: 171002-171002
  • DOI: 10.1103/physrevlett.130.171002
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Sensitivity of the Cherenkov Telescope Array to spectral signatures of hadronic PeVatrons with application to Galactic Supernova Remnants (2023)
  • Author(s): TheCherenkov Telescope Array Consortium, Acero F., Acharyya A., Adam R. et al.
  • Journal Title: Astroparticle Physics Volume: 150 Pages: 102850-102850
  • DOI: 10.1016/j.astropartphys.2023.102850
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Tensor-to-scalar ratio forecasts for extended LiteBIRD frequency configurations (2023)
  • Author(s): Fuskeland U.、Aumont J.、et al
  • Journal Title: Astronomy & Astrophysics Volume: 676 Pages: A42-A42
  • DOI: 10.1051/0004-6361/202346155
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Open Data from the Third Observing Run of LIGO, Virgo, KAGRA, and GEO (2023)
  • Author(s): LIGO Scientific Collaboration, Virgo Collaboration, and KAGRA CollaborationLIGO Scientific Collaboration, Virgo Collaboration, and KAGRA Collaboration
  • Journal Title: The Astrophysical Journal Supplement Series Volume: 267 Issue: 2 Pages: 29-29
  • DOI: 10.3847/1538-4365/acdc9f
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Dark Matter Limits from the CALET Electron+Positron Spectrum with Individual Astrophysical Source Background (2023)
  • Author(s): Holger Motz for the CALET collaboration
  • Journal Title: Proceedings of Science, 38th International Cosmic Ray Conference Volume: 444 Pages: 1385-1385
  • DOI: 10.22323/1.444.1385
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Formation of hot spots around small primordial black holes (2023)
  • Author(s): He Minxi、Kohri Kazunori、Mukaida Kyohei、Yamada Masaki
  • Journal Title: Journal of Cosmology and Astroparticle Physics Volume: 2023 Issue: 01 Pages: 027-027
  • DOI: 10.1088/1475-7516/2023/01/027
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Threshold of primordial black hole formation against velocity dispersion in matter-dominated era (2023)
  • 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
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Search for Gamma-Ray Spectral Lines from Dark Matter Annihilation up to 100 TeV toward the Galactic Center with MAGIC (2023)
  • Author(s): Abe H., Inada T., Nakamori T., Noda K., Saito T., Takahashi M., et al., MAGIC Collaboration
  • Journal Title: Physical Review Letters Volume: 130 Issue: 6 Pages: 061002-061002
  • DOI: 10.1103/physrevlett.130.061002
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Probing primordial black holes with anisotropies in stochastic gravitational-wave background (2022)
  • Author(s): Wang Sai、Vardanyan Valeri、Kohri Kazunori
  • Journal Title: Physical Review D Volume: 106 Issue: 12 Pages: 123511-123511
  • DOI: 10.1103/physrevd.106.123511
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Cosmological 21-cm line observations to test scenarios of super-Eddington accretion on to black holes being seeds of high-redshifted supermassive black holes (2022)
  • Author(s): Kohri Kazunori、Sekiguchi Toyokazu、Wang Sai
  • Journal Title: Physical Review D Volume: 106 Issue: 4 Pages: 43539-43539
  • DOI: 10.1103/physrevd.106.043539
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] The inflaton that could: primordial black holes and second order gravitational waves from tachyonic instability induced in Higgs-R^2 inflation (2022)
  • Author(s): Cheong Dhong Yeon、Kohri Kazunori、Park Seong Chan
  • Journal Title: Journal of Cosmology and Astroparticle Physics Volume: 2022 Issue: 10 Pages: 015-015
  • DOI: 10.1088/1475-7516/2022/10/015
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] A possible solution to the helium anomaly of EMPRESS VIII by cuscuton gravity theory (2022)
  • Author(s): Kazunori Kohri, Kei-ichi Maeda
  • Journal Title: Progress of Theoretical and Experimental Physics Volume: 9 Issue: 9 Pages: 910-910
  • DOI: 10.1093/ptep/ptac114
  • Peer Reviewed / Open Access
• [Presentation] The signal of gravitational wave background reported by pulsar timing observations by NANOGrav15yr (2024)
  • Author(s): Kazunori Kohri
  • Organizer: Tokyo Woman’s Christian University - NAOJ joint seminar
  • Invited
• [Presentation] ダークマターとCALET による宇宙線観測 (2024)
  • Author(s): Kazunori Kohri
  • Organizer: 研究会「CALET による銀河宇宙線・ガンマ線観測の現状と展望」、東大柏の葉キャンパス、Kashiwa
  • Int'l Joint Research / Invited
• [Presentation] MeV gamma-rays, neutrinos, and electron-positron parts from evaporating primordial black holes (2024)
  • Author(s): Kazunori Kohri
  • Organizer: COSI workshop, Kavli IPMU, Kashiwa
  • Int'l Joint Research / Invited
• [Presentation] GravitationalWave Search through Electromagnetic Telescopes (2024)
  • Author(s): Kazunori Kohri
  • Organizer: The Time-Domain Astronomy Seminar, NAOJ, Mitaka
  • Int'l Joint Research / Invited
• [Presentation] Recent topics on cosmology with primordial black holes and their implications for particle physics (2023)
  • Author(s): Kazunori Kohri
  • Organizer: HPNP2023, The 6th International Workshop on Higgs as a Probe of New Physics 2023
  • Int'l Joint Research / Invited
• [Presentation] Recent topics on cosmology with primordial black holes and their implications for particle physics (2023)
  • Author(s): Kazunori Kohri
  • Organizer: PPC2023, The 16th International Conference on Interconnections between Particle Physics and Cosmology, IBS, Daejeon, KOREA
  • Int'l Joint Research / Invited
• [Presentation] Secrets of the Birth of the Universe Probed by the Theory of Black Holes and Gravitational Waves (2023)
  • Author(s): Kazunori Kohri
  • Organizer: The 2023 TANABATA Public Lecture Series
  • Invited
• [Presentation] Introduction: What is dark matter (2023)
  • Author(s): Kazunori Kohri
  • Organizer: Asahi Culture Center Shinjuku Lecture Series, Aproaching the Mystery of Dark Matter, Shinjuku
  • Invited
• [Presentation] The Stochastic Gravitational Waves Detected by NANOGrav15yr and Subsolar-Mass Primordial Black Holes (2023)
  • Author(s): Kazunori Kohri
  • Organizer: QUP week, Tsukuba
  • Int'l Joint Research
• [Presentation] Future X-ray observations by JEDI and funcamental physics (2023)
  • Author(s): Kazunori Kohri
  • Organizer: JEDI WG meeting, JAXA, Sagamihara
  • Invited
• [Presentation] Possible formation of induced gravitational waves and light primordial black hole dark matter in inflationary cosmology as suggested by NANOGrav15yr (2023)
  • Author(s): Kazunori Kohri
  • Organizer: NANOGrav15yr”, The SKA Webinar, online
  • Invited
• [Presentation] 原始ブラックホールの謎 (2023)
  • Author(s): Kazunori Kohri
  • Organizer: 大阪大学湯川記念講演、豊中
  • Invited
• [Presentation] シリーズ「宇宙物理学」最前繰～銀河系を超えて“宇宙のはじまりとビッグバン” (2023)
  • Author(s): Kazunori Kohri
  • Organizer: 朝日カルチャーセンター横浜
  • Invited
• [Presentation] New research directions in high-frequency gravitational waves (2023)
  • Author(s): Kazunori Kohri
  • Organizer: The International Mini-Workshop, Gravitational Waves in the Early Universe, IPT-CAS, Beijing, China
  • Int'l Joint Research / Invited
• [Presentation] New research directions in high-frequency gravitational waves (2023)
  • Author(s): Kazunori Kohri
  • Organizer: Focus Week Primordial Black Holes 2023, Kavli IPMU, Kashiwa
  • Int'l Joint Research / Invited
• [Presentation] 高赤方偏移21cm 線観測で迫る宇宙論の謎ー超巨大ブラックホールの起源・ニュートリノ質量・ダークマターの正体・小スケール密度ゆらぎー (2023)
  • Author(s): Kazunori Kohri
  • Organizer: 初代星・初代銀河研究会2023 北海道大学、札幌
  • Invited
• [Presentation] Series, ”Aproaching the Mystery of Dark Matter”, The 6th of the series, “The Mystery of the Birth of the Universe and Primordial Black Holes”, (2023)
  • Author(s): Kazunori Kohri
  • Organizer: Asahi Culture Center Shinjuku Lecture Series
  • Invited
• [Presentation] “Induced gravitational waves and possible formation of light primordial black hole darkmatter in inflationary cosmology as suggested by NANOGrav15yr (2023)
  • Author(s): Kazunori Kohri
  • Organizer: The 5th ExU interdisciplinary seminar online
• [Presentation] Can we observe a deviation from Starobinsky’s R2 Inflation? (2023)
  • Author(s): Kazunori Kohri
  • Organizer: QUPosium 2023, Epochal Tsukuba
  • Int'l Joint Research / Invited
• [Presentation] Expectations for Future Observations of the Csmological 21cm Line and the Mystery of the Birth of the Universe (2023)
  • Author(s): Kazunori Kohri
  • Organizer: The 72th KagaQ Monday-night science series online, (Series: The 21cm line cosmology)
  • Invited
• [Presentation] “Importance of Subsolar-Mass Primordial Black Holes (2023)
  • Author(s): Kazunori Kohri
  • Organizer: IBS-CTPU Seminar
  • Int'l Joint Research / Invited
• [Presentation] MeV-scale reheating or decaying particles at around MeV (2023)
  • Author(s): Kazunori Kohri
  • Organizer: IBS-CTPU Seminar
  • Int'l Joint Research / Invited
• [Presentation] Gamma-ray Emission from Primordial Black Holes (2023)
  • Author(s): Kazunori Kohri
  • Organizer: The extreme Universe viewed in very-high-energy gamma rays 2022
  • Int'l Joint Research
• [Presentation] Cosmological 21cm line observations to test scenarios of super-Eddington accretion on to seed BHs of high-z SMBHs (2022)
  • Author(s): Kazunori Kohri
  • Organizer: The hybrid-style symposium on Gravitational wave physics and astronomy: Genesis
  • Int'l Joint Research / Invited
• [Presentation] Primordial black holes and secondary gravitational waves in the inflationary Universe (2022)
  • Author(s): Kazunori Kohri
  • Organizer: Extreme Universe Online, Kick-Off Meeting of Publicly Offered Research Groups
  • Int'l Joint Research
• [Presentation] The sterile-active neutrino oscillation and lepto- and/or baryogenesis in the early Universe (2022)
  • Author(s): Kazunori Kohri
  • Organizer: Exploration of Particle Physics and Cosmology with Neutrino
  • Int'l Joint Research / Invited
• [Presentation] Cosmological 21cm line observations to test scenarios of super-Eddington accretion on to seed BHs of high-z SMBHs (2022)
  • Author(s): Kazunori Kohri
  • Organizer: 初代星・初代銀河研究会 2022
  • Int'l Joint Research / Invited
• [Presentation] Theoretical research on methods to measure quantum natures of evaporating primordial black holes by using future observations (2022)
  • Author(s): Kazunori Kohri
  • Organizer: The 2nd Annual Meeting on Extreme Universe
  • Int'l Joint Research
• [Presentation] Primordial black holes and induced gravitational waves in inflationery models (2022)
  • Author(s): Kazunori Kohri
  • Organizer: 東京女子大学 素粒子論セミナー
  • Invited
• [Presentation] MeV γ-ray/CMB: New eyes with which to see quantum nature of Primordial Black Holes (2022)
  • Author(s): Kazunori Kohri
  • Organizer: QUP Project Q workshop
  • Int'l Joint Research
• [Presentation] Cosmological 21cm line observations to test scenarios of super-Eddington accretion on to seed BHs of high-z SMBH (2022)
  • Author(s): Kazunori Kohri
  • Organizer: 筑波大学 天体形成研究会 2022_
  • Int'l Joint Research / Invited
• [Presentation] Testing the early matter-dominated epoch in the early Universe in terms of BBN, CMB, PBH, DM and GWs (2022)
  • Author(s): Kazunori Kohri
  • Organizer: The Future is Illuminating
  • Int'l Joint Research / Invited
• [Presentation] 1) Anisotropies of GWs from merging PBHs, and 2)PBHs and GWs from tachyonic instability induced in Higgs-R^2 inflation (2022)
  • Author(s): Kazunori Kohri
  • Organizer: Non-linear Gravitational wave
  • Int'l Joint Research / Invited
• [Presentation] Testing primordial black-hole dark matter by gamma-ray, gravitational wave, and strong lensing of fast radio bursts (2022)
  • Author(s): Kazunori Kohri
  • Organizer: CosPA 2022
  • Int'l Joint Research / Invited
• [Presentation] Recent topics of PBHs (2022)
  • Author(s): Kazunori Kohri
  • Organizer: Dynamics of primordial black hole formation
  • Int'l Joint Research / Invited
• [Book] 宇宙と物質の起源 「見えない世界」を理解する (ブルーバックス) (2024)
  • Author(s): 高エネルギー加速器研究機構 素粒子原子核研究所 (編集)
  • Total Pages: 320
  • Publisher: 講談社
  • ISBN: 9784065351918
• [Book] 大人的宇宙學教室：透過微中子與重力波解密宇宙起源 (2022)
  • Author(s): Kazunori Kohri
  • Total Pages: 269
  • Publisher: 台灣東販
  • ISBN: 9786263292758
• [Remarks] 国立天文台ニュース 2023-2024年冬号 宇宙の時空 －ついに背景重力波を発見か?
  • URL: https://www.nao.ac.jp/contents/naoj-news/data/nao_news_0342.pdf
• [Remarks] 巨大望遠鏡で狙う暗黒物質からの”光”天の川銀河中心観測で解き明かす宇宙暗黒物質の起源と正体
  • URL: https://www.icrr.u-tokyo.ac.jp/news/13105/
• [Remarks] 科学にフォーカス、宇宙の膨張が加速、暗黒エネルギーの謎 [信濃毎日新聞]
  • URL: http://www2.yukawa.kyoto-u.ac.jp/~kazunori.kohri/KyouDouFiles20221104/Shinano-Mainichi-Shinbun-1002.pdf
• [Remarks] 科学がわかった！宇宙が加速膨張、謎の暗黒エネルギーが要因か？ [山陽新聞]
  • URL: http://www2.yukawa.kyoto-u.ac.jp/~kazunori.kohri/KyouDouFiles20221104/San-You-Shinbun-20220925.pdf
• [Remarks] 科学がわかった Science Q＆A、暗黒エネルギー、宇宙膨張、加速する力 [愛媛新聞]
  • URL: http://www2.yukawa.kyoto-u.ac.jp/~kazunori.kohri/KyouDouFiles20221104/Ehime-Shinbun-20220818.pdf
• [Remarks] 科学がわかった！宇宙を膨張させる力、暗黒エネルギーが加速要因 [高知新聞]
  • URL: http://www2.yukawa.kyoto-u.ac.jp/~kazunori.kohri/KyouDouFiles20221104/Kouchi-Shinbun-20220814.pdf
• [Funded Workshop] KEK-Cosmo, 2024 (2024)
• [Funded Workshop] The KEK-PH + KEK-Cosmo + QUP joint lectures and workshops 2023 on "Hubble Tension 2023" (2023)