• Search Research Projects
  • Search Researchers
  • How to Use
  1. Back to previous page

Study of Nonequilibrium and high-density QCD using Hamiltonian formalism

Research Project

Project/Area Number 21H01084
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Review Section Basic Section 15010:Theoretical studies related to particle-, nuclear-, cosmic ray and astro-physics
Research InstitutionKyoto University (2023-2024)
High Energy Accelerator Research Organization (2021-2022)

Principal Investigator

Hidaka Yoshimasa  京都大学, 基礎物理学研究所, 教授 (00425604)

Co-Investigator(Kenkyū-buntansha) 早田 智也  慶應義塾大学, 医学部(日吉), 准教授 (50762655)
Project Period (FY) 2021-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2024)
Budget Amount *help
¥17,160,000 (Direct Cost: ¥13,200,000、Indirect Cost: ¥3,960,000)
Fiscal Year 2023: ¥6,240,000 (Direct Cost: ¥4,800,000、Indirect Cost: ¥1,440,000)
Fiscal Year 2022: ¥6,240,000 (Direct Cost: ¥4,800,000、Indirect Cost: ¥1,440,000)
Fiscal Year 2021: ¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Keywords量子色力学 / ハミルトニアン形式 / 有限温度,有限密度 / 非平衡系 / ゲージ理論 / QCD
Outline of Research at the Start

極限状態におけるハドロン多体系の物理における2つの未解決問題: ハドロンの非平衡ダイナミクス及び,高密度ハドロン物質の相構造の理解の問題の定性的理解を目指す.これらの状態の理解は宇宙初期の時間発展,高エネルギー重イオン衝突の物理や中性子星の内部がどのような状態になりどのような状態方程式が実現されるかを理解する上で重要になる.格子上のハミルトニアン形式を用いて,その実時間発展や高密度状態を数値シミュレーションすることで,どのようにハドロンが熱平衡状態にいたるか,高密度ハドロンの相構造はどのようになるか明らかにする.

Outline of Final Research Achievements

To overcome the limitations of conventional Monte Carlo methods in tracing how protons and neutrons emerged from the quark-gluon plasma of the early universe and in probing the interiors of high dense Matter such as neutron stars, we developed a new Hamiltonian-based framework and achieved the following results: Real-time simulations on small lattices revealed that thermalization occurs within the short Boltzmann time scale. By reformulating gauge theories with quantum groups, we validated the method's reliability through direct comparison with Monte Carlo data. Applying the density matrix renormalization group to (1+1)-dimensional finite-density systems, we determined the equation of state.

Academic Significance and Societal Importance of the Research Achievements

本手法はモンテカルロ法が直面する「符号問題」の困難を回避し,非平衡・高密度系における強い相互作用を量子色力学の第一原理から解析する新たな道を開いた.
また,今後発展すると期待される量子コンピュータを用いることで,大規模計算が可能になり,宇宙初期のクォークグルーオンプラズマや中性子星の内部状態の解明に大きく寄与すると期待される.

Report

(4 results)
  • 2024 Final Research Report ( PDF )
  • 2023 Annual Research Report
  • 2022 Annual Research Report
  • 2021 Annual Research Report
  • Research Products

    (21 results)

All 2025 2024 2023 2022 2021

All Journal Article (10 results) (of which Peer Reviewed: 10 results,  Open Access: 8 results) Presentation (11 results) (of which Int'l Joint Research: 3 results,  Invited: 8 results)

  • [Journal Article] Quantum circuit for Z_3 lattice gauge theory at nonzero baryon density2025

    • Author(s)
      Hidaka Yoshimasa、Yamamoto Arata
    • Journal Title

      Physical Review D

      Volume: 111 Issue: 1 Pages: 1-1

    • DOI

      10.1103/physrevd.111.014510

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Floquet evolution of the q -deformed SU ( 3 ) _1 Yang-Mills theory on a two-leg ladder2025

    • Author(s)
      Hayata Tomoya、Hidaka Yoshimasa
    • Journal Title

      Physical Review D

      Volume: 111 Issue: 3 Pages: 1-1

    • DOI

      10.1103/physrevd.111.034513

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Dense QCD2 with matrix product states2024

    • Author(s)
      Hayata Tomoya、Hidaka Yoshimasa、Nishimura Kentaro
    • Journal Title

      Journal of High Energy Physics

      Volume: 2024 Issue: 7 Pages: 1-1

    • DOI

      10.1007/jhep07(2024)106

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Z_3 lattice gauge theory as a toy model for dense QCD2024

    • Author(s)
      Hidaka Yoshimasa、Tanizaki Yuya、Yamamoto Arata
    • Journal Title

      Physical Review D

      Volume: 109 Issue: 11 Pages: 1-1

    • DOI

      10.1103/physrevd.109.114502

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Entanglement generation and decoherence in a two-qubit system mediated by relativistic quantum field2023

    • Author(s)
      Y Hidaka, S Iso, K Shimada
    • Journal Title

      Physical Review D

      Volume: 107 Issue: 8 Pages: 085003-145

    • DOI

      10.1103/physrevd.107.085003

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] String-net formulation of Hamiltonian lattice Yang-Mills theories and quantum many-body scars in a nonabelian gauge theory2023

    • Author(s)
      Hayata Tomoya、Hidaka Yoshimasa
    • Journal Title

      Journal of High Energy Physics

      Volume: 2023 Issue: 9 Pages: 1-24

    • DOI

      10.1007/jhep09(2023)126

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Chiral anomaly in a (1+1)-dimensional Floquet system under high-frequency electric fields2023

    • Author(s)
      Fukushima Kenji、Hidaka Yoshimasa、Shimazaki Takuya、Taya Hidetoshi
    • Journal Title

      Annals of Physics

      Volume: 458 Pages: 169494-169494

    • DOI

      10.1016/j.aop.2023.169494

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] q deformed formulation of Hamiltonian SU(3) Yang-Mills theory2023

    • Author(s)
      Hayata Tomoya、Hidaka Yoshimasa
    • Journal Title

      Journal of High Energy Physics

      Volume: 2023 Issue: 9 Pages: 1-24

    • DOI

      10.1007/jhep09(2023)123

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Thermalization of Yang-Mills theory in a (3+1)-dimensional small lattice system2021

    • Author(s)
      Hayata Tomoya, Hidaka Yoshimasa
    • Journal Title

      Physical Review D

      Volume: 103 Issue: 9

    • DOI

      10.1103/physrevd.103.094502

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Diagnosis of information scrambling from Hamiltonian evolution under decoherence2021

    • Author(s)
      Hayata Tomoya, Hidaka Yoshimasa, Kikuchi Yuta
    • Journal Title

      Physical Review D

      Volume: 104 Issue: 7

    • DOI

      10.1103/physrevd.104.074518

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed
  • [Presentation] Hamiltonian lattice gauge theory and application to nonequilibrium and dense QCD2024

    • Author(s)
      Yoshimasa Hidaka
    • Organizer
      Condensed Matter Physics of QCD 2024
    • Related Report
      2023 Annual Research Report
  • [Presentation] Exploring dense QCD through hamiltonian lattice simulations in (1+1) dimensions2024

    • Author(s)
      Yoshimasa Hidaka
    • Organizer
      XVIth Quark Confinement and the Hadron Spectrum
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Hamiltonian lattice gauge theory: Application to nonequilibrium and dense QCD matter2024

    • Author(s)
      Yoshimasa Hidaka
    • Organizer
      West Lake Workshop on Nuclear Physics 2024
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Hamiltonian lattice gauge theory based on spin networks2023

    • Author(s)
      Yoshimasa Hidaka
    • Organizer
      YIPQS long-term workshop Quantum Information, Quantum Matter and Quantum Gravity
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] ハミルトニアン形式を用いた格子ゲージ理論2023

    • Author(s)
      日高義将
    • Organizer
      Tensor Network 2023
    • Related Report
      2023 Annual Research Report
    • Invited
  • [Presentation] String net formulation of Hamiltonian Lattice QCD2023

    • Author(s)
      日高義将
    • Organizer
      日本物理学会2023年春季大会
    • Related Report
      2022 Annual Research Report
  • [Presentation] ハミルトニアン形式を用いた格子ゲージ理論2022

    • Author(s)
      日高義将
    • Organizer
      格子上の場の理論と連続空間上の場の理論
    • Related Report
      2022 Annual Research Report
    • Invited
  • [Presentation] 非可換ゲージ理論のハミルトニアン形式2022

    • Author(s)
      日高義将
    • Organizer
      場の理論の新しい計算方法2022
    • Related Report
      2022 Annual Research Report
    • Invited
  • [Presentation] Yang-Mills code2022

    • Author(s)
      日高義将
    • Organizer
      国内モレキュール型研究会「場の理論の量子計算2022」2022/02
    • Related Report
      2021 Annual Research Report
    • Invited
  • [Presentation] My vision for the future of hadron physics2021

    • Author(s)
      Yoshimasa Hidaka
    • Organizer
      Online Workshop on Physics at the J-PARC K10 Beam line
    • Related Report
      2021 Annual Research Report
    • Invited
  • [Presentation] ハドロンとは何か? J-PARC実験で拓くハドロン物理の新展開2021

    • Author(s)
      日高義将
    • Organizer
      日本物理学会2021年秋季大会
    • Related Report
      2021 Annual Research Report
    • Invited

URL: 

Published: 2021-04-28   Modified: 2026-01-16  

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi