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Lattice simulations of Z3 symmetric QCD at finite chemical potential

Research Project

Project/Area Number 17K05446
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Research Field Particle/Nuclear/Cosmic ray/Astro physics
Research InstitutionSaga University

Principal Investigator

Kouno Hiroaki  佐賀大学, 理工学部, 教授 (80234706)

Project Period (FY) 2017-04-01 – 2020-03-31
Project Status Completed (Fiscal Year 2019)
Budget Amount *help
¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
Fiscal Year 2019: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2018: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2017: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Keywords量子色力学 / 格子シミュレーション / 有限温度 / 有限化学ポテンシャル / Z3対称性 / 符号問題 / 格子量子色力学 / 有限密度 / 虚数化学ポテンシャル / 理論核物理 / 素粒子論 / 実験核物理 / 素粒子実験 / 理論天文学
Outline of Final Research Achievements

The Z3 symmetric QCD was studied at finite chemical potential usign the lattice simulation under the phase quenched approximation. It is well known that the lattice QCD simulation is not fesible at finite quark chemical potential due to the well-known "sign problem".On the otehr hand, it was suggested that the sign problem may be milder in the Z3 symmetric QCD. The Z3 symmetric QCD approches to the ordinary QCD in the low temperature limit. Therefore,the lattice simulation study of Z3 symmetric QCD is very important. In this study, the lattice QCD simululation of Z3 symmetric QCD was done at finite chemical potential using the phase quenched approximation.

Academic Significance and Societal Importance of the Research Achievements

格子QCDの計算は有限のクォーク化学ポテンシャルの状況においては符号問題と呼ばれる問題のためにうまく計算できていない。一方、通常のQCDにないZ3対称性があるようなQCDを考えると、符号問題が軽減されることがQCDの有効模型などから予測されている。そのようなZ3対称性があるQCDは零温度では通常のQCDに一致するので、低温におけるZ3対称なQCDの格子計算をする事で、原子核や中性子星などの零温度近傍のQCD物理を解明する事ができる。この研究では、位相クエンチ近似のもとであるが、Z3対称なQCDの格子シミュレーションを行う事に成功した。これは、世界でも初めての計算であると考えられる。

Report

(4 results)
  • 2019 Annual Research Report   Final Research Report ( PDF )
  • 2018 Research-status Report
  • 2017 Research-status Report
  • Research Products

    (20 results)

All 2019 2018 2017

All Journal Article (8 results) (of which Peer Reviewed: 7 results,  Open Access: 4 results) Presentation (12 results)

  • [Journal Article] Extrapolation for meson screening masses from imaginary to real chemical potential2019

    • Author(s)
      Masahiro Ishii, Akihisa Miyahara, Hiroaki Kouno, Masanobu Yahiro
    • Journal Title

      Physical Review D

      Volume: 99 Issue: 11 Pages: 114010-114010

    • DOI

      10.1103/physrevd.99.114010

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Roberge-Weiss periodicity, canonical sector, and modified Polyakov loop2019

    • Author(s)
      Kashiwa Kouji、Kouno Hiroaki
    • Journal Title

      Physical Review D

      Volume: 100 Issue: 9 Pages: 094023-094023

    • DOI

      10.1103/physrevd.100.094023

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Z3-symmetric lattice QCD simulations at finite chemical potential2019

    • Author(s)
      Hiroaki Kouno
    • Journal Title

      佐賀大学理工学部集報

      Volume: 48 Pages: 1-4

    • Related Report
      2019 Annual Research Report
  • [Journal Article] Thermodynamics for pure SU(2) gauge theory using gradient flow2019

    • Author(s)
      Hirakida T、Itou E、Kouno H
    • Journal Title

      Progress of Theoretical and Experimental Physics

      Volume: 2019 Issue: 3 Pages: 1-23

    • DOI

      10.1093/ptep/ptz003

    • Related Report
      2018 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Thermodynamics for SU(2) pure gauge theory using gradient flow2018

    • Author(s)
      Hirakida T、Itou E、Kouno H
    • Journal Title

      Proceeding of The 36th Annual International Symposium on Lattice Field Theory-LATTICE2018

      Volume: 2018 Pages: 1-6

    • Related Report
      2018 Research-status Report
    • Peer Reviewed
  • [Journal Article] Properties of 2+1 flavor QCD in the imaginary chemical potential region: A model approach2017

    • Author(s)
      Junpei Sugano, Hiraoki Kouno, Masanobu Yahiro
    • Journal Title

      Physical Review D

      Volume: 96 Issue: 1

    • DOI

      10.1103/physrevd.96.014028

    • Related Report
      2017 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Sign problem in a Z3-symmetric effective Polyakov-line model2017

    • Author(s)
      Takehiro Hirakida, Junpei Sugano, Hiroaki Kouno, Junichi Takahashi, Masanobu Yahiro
    • Journal Title

      Physical Review D

      Volume: 96 Issue: 7

    • DOI

      10.1103/physrevd.96.074031

    • Related Report
      2017 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Crossover-model approach to QCD phase diagram, equation of state and susceptibilities in the 2+1 and 2+1+1 flavor systems2017

    • Author(s)
      Miyahara Akihisa, Ishii Masahiro, Kouno Hiroaki, Yahiro Masanobu
    • Journal Title

      International Journal of Modern Physics A

      Volume: 32 Issue: 36 Pages: 1750205-1750205

    • DOI

      10.1142/s0217751x17502050

    • Related Report
      2017 Research-status Report
    • Peer Reviewed
  • [Presentation] 有限密度におけるのZ3-QCDの格子計算2019

    • Author(s)
      開田丈寛、河野宏明、高橋純一、八尋正信
    • Organizer
      日本物理学2019年秋季大会 山形大学
    • Related Report
      2019 Annual Research Report
  • [Presentation] QCD転移を記述する有効模型2019

    • Author(s)
      永良訓人、河野宏明
    • Organizer
      第125回日本物理学会九州支部例会 佐賀大学
    • Related Report
      2019 Annual Research Report
  • [Presentation] Z3対称な量子色力学における格子シミュレーション2019

    • Author(s)
      河野宏明
    • Organizer
      平成30年度公募型利用制度成果報告会、大阪大学サイバーメディアセンター
    • Related Report
      2018 Research-status Report
  • [Presentation] Z3対称性と格子QCD計算2019

    • Author(s)
      河野宏明、開田丈寛、管野淳平
    • Organizer
      日本物理学会第74回年次大会、九州大学
    • Related Report
      2018 Research-status Report
  • [Presentation] 純SU(3)ゲージにおけるpersistent homology解析2019

    • Author(s)
      開田丈寛、大野晃、管野淳平、高橋純一、柏浩司、河野宏明、八尋正信
    • Organizer
      日本物理学会第74回年次大会、九州大学
    • Related Report
      2018 Research-status Report
  • [Presentation] Z3対称性のある格子QCD計算と現象論模型2018

    • Author(s)
      河野宏明、開田丈寛、管野淳平
    • Organizer
      第124回日本物理学会九州支部例会、大分大学
    • Related Report
      2018 Research-status Report
  • [Presentation] Persistent homologyを用いた閉じ込め相と非閉じ込め相の解析2018

    • Author(s)
      開田丈寛、柏浩司、河野宏明、管野淳平、高橋純一、八尋正信
    • Organizer
      第124回日本物理学会九州支部例会、大分大学
    • Related Report
      2018 Research-status Report
  • [Presentation] 純ゲージ理論におけるPolyakov loopのパーシステントホモロジー解析2018

    • Author(s)
      大野晃、開田丈寛、管野淳平、柏浩司、河野宏明
    • Organizer
      第124回日本物理学会九州支部例会、大分大学
    • Related Report
      2018 Research-status Report
  • [Presentation] 虚は実なり-虚数化学ポテンシャルの世界-2018

    • Author(s)
      河野宏明
    • Organizer
      研究会「これまでの原子核物理学の潮流と今後の展望」、九州大学
    • Related Report
      2017 Research-status Report
  • [Presentation] 中心対称性と符号問題2017

    • Author(s)
      河野宏明
    • Organizer
      Kyoto Meeting 2017 summer、京都大学
    • Related Report
      2017 Research-status Report
  • [Presentation] Effective Polyakov-line modelにおける符号問題2017

    • Author(s)
      開田丈寛、管野淳平、河野宏明,高橋純一、八尋正信
    • Organizer
      日本物理学会2017年秋季大会、宇都宮大学
    • Related Report
      2017 Research-status Report
  • [Presentation] ランダムウォーク理論を使った符号問題の解析2017

    • Author(s)
      河野宏明, 開田丈寛, 管野淳平, 高橋純一, 八尋正信
    • Organizer
      第123回日本物理学会九州支部例会,鹿児島大学
    • Related Report
      2017 Research-status Report

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Published: 2017-04-28   Modified: 2021-02-19  

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