Koga Yasutaka 古賀泰敬

… Alternative Names

古賀泰敬コガヤスタカ

Less

Researcher Number	60910891
Affiliation (Current)	2025: 大阪工業大学, 情報科学部, 助教
Affiliation (based on the past Project Information) *help	2021 – 2023: 名古屋大学, 理学研究科, 研究員
Review Section/Research Field	Principal Investigator 0203:Particle-, nuclear-, astro-physics, and related fields Except Principal Investigator Medium-sized Section 11:Algebra, geometry, and related fields
Keywords	Principal Investigator 一般相対性理論 / 光の赤方偏移 / 重力崩壊 / フォトンスフィア / ブラックホールシャドウ / ブラックホール Except Principal Investigator 測地流の可積分性 / ADM理論 / ペンローズ不等式 / 部分多様体の曲率流 / 幾何学的曲率流 / 微分幾何学 / アインシュタイン方程式

Geometry of Gravitational Fields
- Principal Investigator
  
  山田澄生
- Project Period (FY)
  2023 – 2026
- Research Category
  
  Fund for the Promotion of Joint International Research (International Collaborative Research)
- Review Section
  
  Medium-sized Section 11:Algebra, geometry, and related fields
- Research Institution
  Gakushuin University
動的なブラックホールのフォトンスフィアとシャドウの研究Principal Investigator
- Principal Investigator
  
  古賀泰敬
- Project Period (FY)
  2021 – 2024
- Research Category
  
  Grant-in-Aid for Research Activity Start-up
- Review Section
  
  0203:Particle-, nuclear-, astro-physics, and related fields
- Research Institution
  Nagoya University

All 2024 2023 2022 2021

All Journal Article Presentation

[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
- Peer Reviewed
- Data Source
  KAKENHI-PROJECT-21K20367, KAKENHI-PROJECT-19K03876, KAKENHI-PLANNED-20H05853
[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
- Peer Reviewed
- Data Source
  KAKENHI-PROJECT-21K20367, KAKENHI-PROJECT-19K03876, KAKENHI-PLANNED-20H05853
[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
- Peer Reviewed / Open Access
- Data Source
  KAKENHI-PROJECT-19K03876, KAKENHI-PROJECT-20K03968, KAKENHI-PROJECT-21K13918, KAKENHI-PROJECT-21K20367, KAKENHI-PROJECT-20H01932, KAKENHI-PROJECT-19H01895, KAKENHI-PLANNED-20H05853
[Journal Article] Dynamical photon sphere and time evolving shadow around black holes with temporal accretion2022
- Author(s)
  Yasutaka Koga, Nobuyuki Asaka, Masashi Kimura, Kazumasa Okabayashi
- Journal Title
  
  Physical Review D
  
  Volume: -
- Peer Reviewed
- Data Source
  KAKENHI-PROJECT-21K20367
[Presentation] Initial Spins of Primordial Black Holes Formed with a Soft Equation of State2024
- Author(s)
  斎藤大生, 原田知広, 古賀泰敬, 柳哲文
- Organizer
  Symposium of “What is dark matter?”
- Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-21K20367
[Presentation] 小玉ベクトルと自由粒子のエネルギー2024
- Author(s)
  古賀泰敬, 安積伸幸, 木村匡志, 岡林一賢
- Organizer
  一般相対論と幾何
- Data Source
  KAKENHI-PROJECT-21K20367
[Presentation] Shadow formation in gravitational collapse and effect of redshift by spacetime dynamics2024
- Author(s)
  古賀泰敬
- Organizer
  Seminar at Institute for Basic Science (IBS) in Korea
- Invited
- Data Source
  KAKENHI-PROJECT-21K20367
[Presentation] 重力崩壊におけるシャドウ形成と光の赤方偏移2024
- Author(s)
  古賀泰敬, 安積伸幸, 木村匡志, 岡林一賢
- Organizer
  日本物理学会2024年春季大会
- Data Source
  KAKENHI-PROJECT-21K20367
[Presentation] Shadow formation in gravitational collapse and redshift of lights2023
- Author(s)
  古賀泰敬, 安積伸幸, 木村匡志, 岡林一賢
- Organizer
  The 32nd Workshop on General Relativity and Gravitation in Japan
- Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-21K20367
[Presentation] Photon sphere and shadow evolution in a dynamical black hole spacetime2023
- Author(s)
  古賀泰敬, 安積伸幸, 木村匡志, 岡林一賢
- Organizer
  XV International Conference on Gravitation, Astrophysics and Cosmology (ICGAC15)
- Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-21K20367
[Presentation] 重力崩壊に伴う赤方偏移について2023
- Author(s)
  古賀泰敬, 安積伸幸, 木村匡志, 岡林一賢
- Organizer
  第24回特異点研究会
- Data Source
  KAKENHI-PROJECT-21K20367
[Presentation] BH formation by isocurvature perturbation with a massive scalar field2023
- Author(s)
  古賀泰敬, 平野進一, 佐々木節, 柳哲文
- Organizer
  Dynamics of Primordial Black Hole Formation
- Invited / Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-21K20367
[Presentation] 重力収縮するシェルのシャドウ形成2023
- Author(s)
  古賀泰敬, 安積伸幸, 木村匡志, 岡林一賢
- Organizer
  日本物理学会2023年春季大会
- Data Source
  KAKENHI-PROJECT-21K20367
[Presentation] ヌルダスト降着におけるブラックホールシャドウと光子球面の解析2022
- Author(s)
  古賀泰敬, 木村匡志, 岡林一賢, 安積伸幸
- Organizer
  ブラックホール磁気圏研究会2022,
- Data Source
  KAKENHI-PROJECT-21K20367
[Presentation] Dynamical photon sphere and time evolving shadow around black holes with temporal accretion2022
- Author(s)
  古賀泰敬, 安積伸幸, 木村匡志, 岡林一賢
- Organizer
  Gravity: Current challenges in black hole physics and cosmology
- Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-21K20367
[Presentation] Effective inspiral spin distribution of primordial black hole binaries2022
- Author(s)
  古賀泰敬, 原田知広, 多田祐一郎, 横山修一郎, 柳哲文
- Organizer
  The 31st Workshop on General Relativity and Gravitation in Japan
- Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-21K20367
[Presentation] シェルの重力崩壊とシャドウ2022
- Author(s)
  古賀泰敬, 安積伸幸, 木村匡志, 岡林一賢
- Organizer
  第23回特異点研究会
- Data Source
  KAKENHI-PROJECT-21K20367
[Presentation] Effective spin distribution of PBH binaries with critical phenomena2022
- Author(s)
  古賀泰敬, 原田知広, 多田祐一郎, 横山修一郎, 柳哲文
- Organizer
  2022 Summer NRF-JSPS Workshop
- Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-21K20367
[Presentation] 臨界現象を考慮したPBH binaryの有効スピンなどの分布2022
- Author(s)
  古賀泰敬, 原田知広, 多田祐一郎, 横山修一郎, 柳哲文
- Organizer
  日本物理学会秋季大会
- Data Source
  KAKENHI-PROJECT-21K20367
[Presentation] ヌルダスト降着におけるブラックホールシャドウと光子球面の解析2021
- Author(s)
  古賀泰敬, 木村匡志, 岡林一賢, 安積伸幸
- Organizer
  日本物理学会秋季大会,
- Data Source
  KAKENHI-PROJECT-21K20367
[Presentation] Vaidya時空のphoton sphere2021
- Author(s)
  古賀泰敬, 木村匡志, 岡林一賢, 安積伸幸
- Organizer
  第22回特異点研究会
- Data Source
  KAKENHI-PROJECT-21K20367
[Presentation] Photon sphere and black hole shadow in Vaidya spacetime2021
- Author(s)
  古賀泰敬
- Organizer
  The 31th Workshop on General Relativity and Gravitation in Japan
- Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-21K20367

1. 山田澄生 (90396416)

# of Collaborated Projects: 1 results

# of Collaborated Products: 0 results
2. 白水徹也 (10282716)

# of Collaborated Projects: 1 results

# of Collaborated Products: 0 results
3. 伊形尚久 (40711487)

# of Collaborated Projects: 1 results

# of Collaborated Products: 0 results
4. 原田知広

# of Collaborated Projects: 0 results

# of Collaborated Products: 1 results

Koga Yasutaka 古賀 泰敬

古賀 泰敬 コガ ヤスタカ

Research Projects

Research Products

Co-Researchers

Geometry of Gravitational Fields

Principal Investigator

Project Period (FY)

Research Category

Review Section

Research Institution

動的なブラックホールのフォトンスフィアとシャドウの研究Principal Investigator

Principal Investigator

Project Period (FY)

Research Category

Review Section

Research Institution

[Journal Article] Revisiting compaction functions for primordial black hole formation2023

Author(s)

Journal Title

DOI

Data Source

[Journal Article] Spins of primordial black holes formed with a soft equation of state2023

Author(s)

Journal Title

DOI

Data Source

[Journal Article] Effective Inspiral Spin Distribution of Primordial Black Hole Binaries2022

Author(s)

Journal Title

DOI

Data Source

[Journal Article] Dynamical photon sphere and time evolving shadow around black holes with temporal accretion2022

Author(s)

Journal Title

Data Source

[Presentation] Initial Spins of Primordial Black Holes Formed with a Soft Equation of State2024

Author(s)

Organizer

Data Source

[Presentation] 小玉ベクトルと自由粒子のエネルギー2024

Author(s)

Organizer

Data Source

[Presentation] Shadow formation in gravitational collapse and effect of redshift by spacetime dynamics2024

Author(s)

Organizer

Data Source

[Presentation] 重力崩壊におけるシャドウ形成と光の赤方偏移2024

Author(s)

Organizer

Data Source

[Presentation] Shadow formation in gravitational collapse and redshift of lights2023

Author(s)

Organizer

Data Source

[Presentation] Photon sphere and shadow evolution in a dynamical black hole spacetime2023

Author(s)

Organizer

Data Source

[Presentation] 重力崩壊に伴う赤方偏移について2023

Author(s)

Organizer

Data Source

[Presentation] BH formation by isocurvature perturbation with a massive scalar field2023

Author(s)

Organizer

Data Source

[Presentation] 重力収縮するシェルのシャドウ形成2023

Author(s)

Organizer

Data Source

[Presentation] ヌルダスト降着におけるブラックホールシャドウと光子球面の解析2022

Author(s)

Organizer

Data Source

[Presentation] Dynamical photon sphere and time evolving shadow around black holes with temporal accretion2022

Author(s)

Organizer

Data Source

Koga Yasutaka 古賀泰敬

古賀泰敬コガヤスタカ