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

STUDY OF NONEQUILIBRIUM QUARK-GLUON PLASMA

Research Project

Project/Area Number 12640287
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field 素粒子・核・宇宙線
Research InstitutionOsaka City University

Principal Investigator

NIEGAWA Akira  Osaka City University, Graduate School of Science, Professor, 大学院・理学研究科, 教授 (90047358)

Project Period (FY) 2000 – 2001
Project Status Completed (Fiscal Year 2001)
Budget Amount *help
¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 2001: ¥400,000 (Direct Cost: ¥400,000)
Fiscal Year 2000: ¥400,000 (Direct Cost: ¥400,000)
Keywordssigma model / quark-gluon plasma / nonequilibrium system / pinch singularity / Boltzmann equation / supernova explosion / perturbation theory / neutrino conversion / 伝播関数 / quark-gluon plasma / QCD / hot QCD / nonequi librium QCD / thermal field theory / gap equation / Boltzmann equation
Research Abstract

Within a nonequilibrium quantum-field system, such as a quark-gluon plasma (QGP) and a core of supernova explosion (SN), various processes take place, which causes spacetime evolution of the system per se. A perturbation theory for dealing with such a nonequilibrium system is a scheme, which enables one to compute reaction rates for the processes and, at the same time, to determine spacetime evolution of the system.
Under the present research project, a novel perturbation theory is constructed, in which, in contrast to the conventional one, no pinch singularity appears and the Boltzmann equation, which describes spacetime evolution of the system, comes about from the theory in itself.
A novel perturbation theory is framed for dealing with the nonequilibrium system that is governed by the O(N) (N=4) linear-sigma model. This model describes chiral phase transition of quantum chromodynamics (QCD) that governs the QGP. The framed perturbation theory allowed one to compute various reaction rates and, simultaneously, to determine how the phase transition proceeds as a result of the reactions.
A set of perturbation theories for dealing with gauge bosons, such as gluons in QCD, and fermions, such as quarks in QCD, are framed through constructing gauge-boson and fermion propagators. This theory allows one to systematically analyze nonequilibrium systems, such as those governed by a standard model (QCD, electro-weak theory) and by a quantum electrodynamics (QED).
As an example of the theory, rates of neutrino conversion and decay in a core region of supernova explosions. A characteristic peak structure is found for outgoing neutrino spectrum.

Report

(3 results)
  • 2001 Annual Research Report   Final Research Report Summary
  • 2000 Annual Research Report
  • Research Products

    (15 results)

All Other

All Publications (15 results)

  • [Publications] A.Niegawa: "Out of equilibrium O(N) lineur-sigma system: Construction of perturbation theory with gap and Boltzmann equaticns"Physical Review D. 62. 1250041-12500416 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] A.Niegawa: "Gauge-boson propagator in out of equilibrium quantum-field system and the Boltzmann equation"Physical Review D. 64. 0360041-03600412 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] N.Asida, A.Niegawa, H.Ozaki, M.Kubota: "Rates of neutrino conversion and decay in hot and dense QED plasma"Physical Review D. 65. 0560071-05600713 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] A.Niegawa: "Fermion propagator in an out of equilibrium quantum-field system and the Boltzmann equation"Physical Review D. 65. 0560091-05600911 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] A.Niegawa: "Comment on fermion propagator in real-time quantum-field theory at finite temperature and density"Modern Physics Letters A. (掲載予定).

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] A. Niegawa: "Out of equilibrium 0(N) linear-sigma system : Construction of perturbation theory with gap and Boltzmann equations"Physical Review D. 62-12. 125004-1-16 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] A. Niegawa: "Gauge-boson propagator in out of equilibrium quantum-field system and the Boltzmann equation"Physical Review D. 64-3. 036004-1-12 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] N. Asida, A. Niegawa, H. Ozaki and M. Kubota: "Rates of neutrino conversion and decay in hot and dense QED plasma"Physical Review D. 65-5. 056007-1-13 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] A. Niegawa: "Fermion propagator in an out of equilibrium quantum-field system and the Boltzmann equation"Physical Review D. 65-5. 056009-1-11 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] A. Niegawa: "Comment on fermion propagator in real-time quantum-field theory at finite temperature and density"Modern Physics Letters A. (to appear).

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] A.Niegawa: "Gauge-boson propagator in out of equilibrium quanfum-field system and the Boltzmann equation"Physical Review D. 64・3. 036004-1-036004-12 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] N.Asida, A.Niegqwa, H.Ozaki, M.Kubota: "Rates of newtrino conversion and decay in hot and dense QED plasma"Physical Review D. 65・5. 056007-1-056007-13 (2002)

    • Related Report
      2001 Annual Research Report
  • [Publications] A.Niegawa: "Fermion propagator in an out of equilibrium quantum-field system and the Boltzmann equation"Physical Review D. 65・5. 056009-1-056009-11 (2002)

    • Related Report
      2001 Annual Research Report
  • [Publications] A.Niegawa: "Comment on fermion propagator in real-time quantum-field theory at finite temperature and density"Modern Physics Letters A. (掲載予定).

    • Related Report
      2001 Annual Research Report
  • [Publications] A.Niegawa: "Out of equilibrium O(N) linear-sigma system : Construction of perturbation theory with gap and Boltzmann equations"Physical Review D. 62・12. 125004-1-16 (2000)

    • Related Report
      2000 Annual Research Report

URL: 

Published: 2000-04-01   Modified: 2016-04-21  

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi