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Can Baryon-Dark Matter Streaming Motion Explain Supermassive Blackholes in the Early Universe?

Research Project

Project/Area Number 19K23455
Research Category

Grant-in-Aid for Research Activity Start-up

Allocation TypeMulti-year Fund
Review Section 0204:Astronomy, earth and planetary science, and related fields
Research InstitutionThe University of Tokyo

Principal Investigator

Park Hyunbae  東京大学, カブリ数物連携宇宙研究機構, 特任研究員 (40842985)

Project Period (FY) 2019-08-30 – 2022-03-31
Project Status Granted (Fiscal Year 2020)
Budget Amount *help
¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
Fiscal Year 2020: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2019: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Keywordscosmology / astrophysics / early universe / first stars / numerical simulation / Cosmology / Numerical simulation / Reionization / First stars / Blackholes / Gas dynamics / Blackhole
Outline of Research at the Start

We shall show that the streaming motion between gas and dark matter leads to formation of blackholes of ~100,000 solarmass when universe was 0.1 billion years old. Then, we shall study the signature of those blackholes to be observed by future giant telescopes and gravitational wave experiment.

Outline of Annual Research Achievements

[Achievement 1] Finished building a pipeline for creating initial conditions of cosmological simulations with the streaming effect.
[Achievement 2] Published two first-authored papers on how the streaming velocity affect the gas structures of early universe. See the next section for the detail of the published papers.
[Achievement 3] Provided my main collaborator (Dr. Shingo Hirano) with my early universe simulation data so that he can run blackhole formation simulation.
[Achievement 4] Transferring my skills and pipe lines to graduate students at the University of Tokyo.

Current Status of Research Progress
Current Status of Research Progress

1: Research has progressed more than it was originally planned.

Reason

The proposed research project is not only progressing as planned, but also stimulating new projects with new collaborators. The final remaining goal is to produce a paper on blackhole formation with the streaming velocity. Regarding the new projects, please read "Planning for the Future Work" for details.

Strategy for Future Research Activity

[Plan 1] I will be able to study the impacts of the streaming velocity on objects other than blackholes using my own simulation pipeline.
[Plan 2] I will keep supporting other simulation works by providing initial conditions with the baryon-dark matter streaming velocity.
[Plan 3] We will implement the results from my small-scale simulations in the large-scale simulations of my international collaborators. The collaborators include Prof. Andrei Mesinger at Scuola Normale Superiore, Prof. Julian Munos at Harvard University, and Dr. Jaehong Park at Korea Institute for Advanced Study.

Report

(2 results)
  • 2020 Research-status Report
  • 2019 Research-status Report

Research Products

(20 results)

All 2021 2020 2019 Other

All Int'l Joint Research (5 results) Journal Article (3 results) (of which Int'l Joint Research: 3 results,  Peer Reviewed: 3 results,  Open Access: 2 results) Presentation (12 results) (of which Int'l Joint Research: 5 results,  Invited: 1 results)

  • [Int'l Joint Research] Chosun University/Korea Institute for Advanced Study(韓国)

    • Related Report
      2020 Research-status Report
  • [Int'l Joint Research] Scuola Normale Superiore(イタリア)

    • Related Report
      2020 Research-status Report
  • [Int'l Joint Research] Harvard University/University of Texas at Austin(米国)

    • Related Report
      2020 Research-status Report
  • [Int'l Joint Research] Chosun University(韓国)

    • Related Report
      2019 Research-status Report
  • [Int'l Joint Research] University of California at Riverside/University of Texas at Austin(米国)

    • Related Report
      2019 Research-status Report
  • [Journal Article] Large-scale Variation in Reionization History Caused by Baryon-Dark Matter Streaming Velocity2021

    • Author(s)
      Park Hyunbae、Shapiro Paul R.、Ahn Kyungjin、Yoshida Naoki、Hirano Shingo
    • Journal Title

      The Astrophysical Journal

      Volume: 908 Pages: 96-107

    • DOI

      10.3847/1538-4357/abd7f4

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] The impact of inhomogeneous subgrid clumping on cosmic reionization - II. Modelling stochasticity2021

    • Author(s)
      Bianco Michele、Iliev Ilian T、Ahn Kyungjin、Giri Sambit K、Mao Yi、Park Hyunbae、Shapiro Paul R
    • Journal Title

      Monthly Notices of the Royal Astronomical Society

      Volume: 504 Pages: 2443-2460

    • DOI

      10.1093/mnras/stab787

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] First Structure Formation under the Influence of Gas-Dark Matter Streaming Velocity and Density: Impact of the “Baryons Trace Dark Matter” Approximation2020

    • Author(s)
      Park Hyunbae、Ahn Kyungjin、Yoshida Naoki、Hirano Shingo
    • Journal Title

      The Astrophysical Journal

      Volume: 900 Pages: 30-30

    • DOI

      10.3847/1538-4357/aba26e

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Presentation] Intergalactic Medium During the Epoch of Reionization2021

    • Author(s)
      Hyunbae Park
    • Organizer
      Lawrence Berkeley National Lab Computational Cosmology Center Colloquium
    • Related Report
      2020 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Scatter in Reionization History Induced by Baryon-Dark Matter Streaming Motion2020

    • Author(s)
      Hyunbae Park
    • Organizer
      Kavli IPMU Lunch Seminar
    • Related Report
      2020 Research-status Report
  • [Presentation] Scatter in Reionization History Induced by Baryon-Dark Matter Streaming Motion2020

    • Author(s)
      Hyunbae Park
    • Organizer
      RESCEU summer school talk
    • Related Report
      2020 Research-status Report
  • [Presentation] Scatter in Reionization History Induced by Baryon-Dark Matter Streaming Motion2020

    • Author(s)
      Hyunbae Park
    • Organizer
      Kavli IPMU Colloquium
    • Related Report
      2020 Research-status Report
  • [Presentation] Large-scale Variation in Reionization History Caused by Baryon-Dark Matter Streaming Motion2020

    • Author(s)
      Hyunbae Park
    • Organizer
      Korea Institute for Advanced Study
    • Related Report
      2020 Research-status Report
    • Int'l Joint Research
  • [Presentation] First Structure Formation under the Influence of Baryon-Dark Matter Streaming Motion2020

    • Author(s)
      Hyunbae Park
    • Organizer
      Tohoku Univ. First Star Meeting
    • Related Report
      2020 Research-status Report
  • [Presentation] Implication of Baryon-Dark Matter Streaming Velocity on Reionization2020

    • Author(s)
      Hyunbae Park
    • Organizer
      The 235th American Astronomy Society
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] Does Baryon-Dark Matter Streaming Motion Accelerate the Cosmic Reionization?2020

    • Author(s)
      Hyunbae Park
    • Organizer
      National Astronomical Observatory of Japan
    • Related Report
      2019 Research-status Report
  • [Presentation] Can Baryon-Dark Matter Streaming Motion Accelerate the Cosmic Reionization?2020

    • Author(s)
      Hyunbae Park
    • Organizer
      University of Tokyo Astrophysics Seminar
    • Related Report
      2019 Research-status Report
  • [Presentation] Impact of the Baryon-Dark Matter Streaming Motion on the Epoch of Reionization2020

    • Author(s)
      Hyunbae Park
    • Organizer
      FirstStarIV
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] Impact of Baryon-Dark Matter Streaming Velocity on Reionization2019

    • Author(s)
      Hyunbae Park
    • Organizer
      First Shanghai Assembly
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] Implication of Baryon-Dark Matter Streaming Velocity on Reionization2019

    • Author(s)
      Hyunbae Park
    • Organizer
      Kavli IPMU Lunch Seminar
    • Related Report
      2019 Research-status Report

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Published: 2019-09-03   Modified: 2021-12-27  

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