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観測的に支持されているインフレーションモデルの宇宙論的帰結

Research Project

Project/Area Number 19J21472
Research Category

Grant-in-Aid for JSPS Fellows

Allocation TypeSingle-year Grants
Section国内
Review Section Basic Section 15010:Theoretical studies related to particle-, nuclear-, cosmic ray and astro-physics
Research InstitutionHigh Energy Accelerator Research Organization (2020-2021)
The University of Tokyo (2019)

Principal Investigator

HE MINXI  大学共同利用機関法人高エネルギー加速器研究機構, 素粒子原子核研究所, 研究員

Project Period (FY) 2019-04-25 – 2022-03-31
Project Status Completed (Fiscal Year 2021)
Budget Amount *help
¥3,400,000 (Direct Cost: ¥3,400,000)
Fiscal Year 2021: ¥1,100,000 (Direct Cost: ¥1,100,000)
Fiscal Year 2020: ¥1,100,000 (Direct Cost: ¥1,100,000)
Fiscal Year 2019: ¥1,200,000 (Direct Cost: ¥1,200,000)
KeywordsReheating / Inflation / Higgs / R^2 / Preheating / Tachyonic instability
Outline of Research at the Start

This study focuses on a promising inflation model which can explain the evolution of the early universe. In order for further test, it is necessary to study how it reheats the empty universe after inflation. The prediction on primordial gravitational waves and black holes are also considered.

Outline of Annual Research Achievements

I have finished the investigation of the reheating process after inflation in the mixed Higgs-R^2 model. My study can improve the observational constraint on this theoretically motivated inflation model with minimal setup within the Standard Model and general relativity. I investigated the perturbative reheating in this model where the perturbative decay of inflatons to relativistic particles plays an essential role. Such a process usually dominates the energy transfer from inflaton to radiation at late time. Besides, the perturbative reheating always occurs as long as the preheating process is not fine-tuned enough to reheating the Universe. I calculated the perturbative decay rates of inflatons and found that they differ significantly from the single-field case due to the multi-field structure. I took into account the decay rates as friction terms in the equations of motion of inflatons and solved them numerically together with the Boltzmann equation, finding that the reheating temperature is independent of the detail of preheating while the duration will differ as the efficiency of preheating changes. The reheating temperature is higher for Higgs-like parameters than for R^2-like. This result breaks the degeneracy of inflation predictions among model parameters so that more precise observation in the future can easily constrain the model parameter in this model. Confirming or ruling out this model is decisive for the question whether inflation is realized with physics beyond the Standard Model.

Research Progress Status

令和3年度が最終年度であるため、記入しない。

Strategy for Future Research Activity

令和3年度が最終年度であるため、記入しない。

Report

(3 results)
  • 2021 Annual Research Report
  • 2020 Annual Research Report
  • 2019 Annual Research Report
  • Research Products

    (20 results)

All 2021 2020 2019 Other

All Int'l Joint Research (4 results) Journal Article (3 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 3 results) Presentation (13 results) (of which Int'l Joint Research: 11 results,  Invited: 1 results)

  • [Int'l Joint Research] Landau Institute for Theoretical Physics(ロシア連邦)

    • Related Report
      2020 Annual Research Report
  • [Int'l Joint Research] Deutsches Elektronen-Synchrotron DESY(ドイツ)

    • Related Report
      2020 Annual Research Report
  • [Int'l Joint Research] Landau Institute for Theoretical Physics(ロシア連邦)

    • Related Report
      2019 Annual Research Report
  • [Int'l Joint Research] Deutsches Elektronen-Synchrotron DESY(ドイツ)

    • Related Report
      2019 Annual Research Report
  • [Journal Article] Perturbative reheating in the mixed Higgs-?<sup>2</sup> model2021

    • Author(s)
      He Minxi
    • Journal Title

      Journal of Cosmology and Astroparticle Physics

      Volume: 2021 Issue: 05 Pages: 021-021

    • DOI

      10.1088/1475-7516/2021/05/021

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Occurrence of tachyonic preheating in the mixed Higgs-R2 model2021

    • Author(s)
      He Minxi、Jinno Ryusuke、Kamada Kohei、Starobinsky Alexei A.、Yokoyama Jun'ichi
    • Journal Title

      Journal of Cosmology and Astroparticle Physics

      Volume: 2021 Issue: 01 Pages: 066-066

    • DOI

      10.1088/1475-7516/2021/01/066

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Formation threshold of rotating primordial black holes2019

    • Author(s)
      He Minxi、Suyama Teruaki
    • Journal Title

      Physical Review D

      Volume: 100 Issue: 6 Pages: 1-11

    • DOI

      10.1103/physrevd.100.063520

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed
  • [Presentation] Reheating in the mixed Higgs-R^2 model2021

    • Author(s)
      Minxi He
    • Organizer
      26th International Symposium on Particles, Strings & Cosmology
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Reheating Process in Mixed Higgs-R^2 Model2021

    • Author(s)
      Minxi He
    • Organizer
      COSMO'21
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Perturbative Reheating after Mixed Higgs-R^2 Inflation2021

    • Author(s)
      Minxi He
    • Organizer
      RESCEU Summer School
    • Related Report
      2021 Annual Research Report
  • [Presentation] Reheating Process in Mixed Higgs-R^2 Model2021

    • Author(s)
      Minxi He
    • Organizer
      The 30th Workshop on General Relativity and Gravitation in Japan
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Reheating in the mixed Higgs-$ R^2 $ model2020

    • Author(s)
      Minxi He
    • Organizer
      Cosmology seminar at Perimeter Institute of Theoretical Physics
    • Related Report
      2020 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Preheating in the mixed Higgs-$ R^2 $ model2020

    • Author(s)
      Minxi He
    • Organizer
      Seminar at Yonsei University
    • Related Report
      2020 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Tachyonic preheating in the mixed Higgs-$ R^2 $ model2020

    • Author(s)
      Minxi He
    • Organizer
      RESCEU Summer School
    • Related Report
      2020 Annual Research Report
  • [Presentation] Reheating in the mixed Higgs-$ R^2 $ model2020

    • Author(s)
      Minxi He
    • Organizer
      Online JGRG Workshop 2020
    • Related Report
      2020 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Rotation and Formation Threshold of Primordial Black Holes2019

    • Author(s)
      He Minxi
    • Organizer
      Planet2/RESCEU Summer School―From the Solar System to the Universe
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Preheating in the Mixed Higgs-R^2 Model2019

    • Author(s)
      He Minxi
    • Organizer
      COSMO19
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Formation Threshold of Rotating Primordial Black Holes2019

    • Author(s)
      He Minxi
    • Organizer
      APPC2019
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Formation Threshold of Rotating Primordial Black Holes2019

    • Author(s)
      He Minxi
    • Organizer
      JGRG29
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Formation Threshold of Rotating Primordial Black Holes2019

    • Author(s)
      He Minxi
    • Organizer
      Focus Weeks on PBHs
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research

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Published: 2019-05-29   Modified: 2024-03-26  

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