Influence of dynamical strange quark on finite-temperature QCD transition

动力奇夸克对有限温度QCD跃迁的影响

基本信息

  • 批准号:
    13640260
  • 负责人:
  • 金额:
    $ 2.37万
  • 依托单位:
  • 依托单位国家:
    日本
  • 项目类别:
    Grant-in-Aid for Scientific Research (C)
  • 财政年份:
    2001
  • 资助国家:
    日本
  • 起止时间:
    2001 至 2004
  • 项目状态:
    已结题

项目摘要

Through a series of evidences, the quark-gluon plasma seems to be created in the early stage of relativistic heavy-ion collisions at RHIC. In order to extract thermodynamic properties of the quark-gluon plasma quantitatively, a lattice calculation of finite temperature QCD-directly from the first principles of QCD-is indispensable. Because the typical energy scale given by the QCD transition temperature is about the strange quark mass, a realistic simulation require a dynamical treatment of the strange quark (three-flavor QCD) besides conventional up and down quarks (two-flavor QCD). Due to various difficulties, however, most large-scale simulations have been done in two-flavor QCD.Toward a realistic simulation of the quark-gluon plasma, this project aims at a systematic study of three-flavor QCD. We also study efficient methods for thermodynamic quantities in finite-temperature lattice QCD.As the first step of the three-flavor project, we carried out a systematic comparison of various … More exact algorithms proposed recently for QCD with odd number of flavors. We found a version of the PHMC algorithm is efficient enough for a systematic study of three-flavor QCD. From a preparative simulation using the PHMC algorithm, we also find that improvement of both gauge and quark actions is indispensable for a continuum extrapolation with present power of computers. Finally we determined non-perturbative values of the improvement parameter c_<sw> at relevant coupling parameters.Based on these results, we started a systematic study of hadronic spectroscopy in three-flavor QCD at zero temperature. We studied at three lattice spacings, 0.122, 0.10, and 0.07 fm, on 16^3x32, 20^3x40, and 24^3x56 lattices, respectively. Simulations on the first two lattices have been completed, and that on the finest lattice on-going. We confirmed that, in contrast to the discrepancy of quenched spectrum observed in a previous study, three-flavor QCD reproduces experimental meson spectrum correctly. We also found that the light u,d quark mass and the s quark mass are about 20--30% smaller than those evaluated previously in the quenched QCD.We also studied efficient methods to calculate the equation of state and thermodynamic quantities in finite-temperature QCD. In a quenched simulation, we have shown that anisotropic lattices provide us with such an efficient way. Accordingly, we have carried out the first controlled continuum extrapolation of the equation of state using data at three lattice spacings. To carry out a more realistic calculation in QCD with dynamical quarks, we evaluated non-perturvative values of anisotropy coefficients in two-flavor QCD with improved quark and gluon actions. Less
通过一系列证据,夸克-胶子等离子体似乎是在RHIC相对论性重离子碰撞的早期阶段产生的。为了定量地提取夸克-胶子等离子体的热力学性质,直接从量子cd的第一原理出发,进行有限温度量子cd的点阵计算是必不可少的。由于QCD跃迁温度给出的典型能量尺度是关于奇异夸克质量的,因此真实的模拟除了需要对传统的上下夸克(双味QCD)进行动力学处理外,还需要对奇异夸克(三味QCD)进行动力学处理。然而,由于各种困难,大多数大规模模拟都是在双味QCD中进行的。本项目旨在对三味量子cd进行系统的研究,以期实现夸克-胶子等离子体的真实模拟。我们还研究了有限温度晶格QCD中热力学量的有效方法。作为三味项目的第一步,我们对最近提出的针对奇数味QCD的更精确的算法进行了系统的比较。我们发现PHMC算法的一个版本足够有效,可以系统地研究三味QCD。从PHMC算法的预备模拟中,我们还发现在现有的计算机能力下,规范和夸克作用的改进对于连续统外推是必不可少的。最后确定了改进参数c_<sw>在相关耦合参数下的非摄动值。在此基础上,我们对零温度下三味QCD的强子光谱进行了系统的研究。我们分别在16^3x32、20^3x40和24^3x56晶格上研究了三种晶格间距,0.122、0.10和0.07 fm。对前两种晶格的模拟已经完成,对最优晶格的模拟正在进行中。我们证实,与先前研究中观察到的猝灭光谱差异不同,三味QCD能正确地再现实验中的介子光谱。我们还发现轻的u,d夸克质量和s夸克质量比先前在淬灭QCD中估计的要小20- 30%。我们还研究了有限温度QCD中状态方程和热力学量的有效计算方法。在淬火模拟中,我们已经证明各向异性晶格为我们提供了这样一种有效的方法。因此,我们利用三个晶格间隔的数据进行了状态方程的第一次受控连续统外推。为了在具有动态夸克的QCD中进行更真实的计算,我们在改进的夸克和胶子作用下评估了双味QCD各向异性系数的非摄动值。少

项目成果

期刊论文数量(77)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
Scaling study of the step scaling function in SU(3) gauge theory with improved gauge actions
SU(3)规范理论中改进规范作用的阶跃标度函数的标度研究
  • DOI:
  • 发表时间:
    2004
  • 期刊:
  • 影响因子:
    0
  • 作者:
    Fujita H.;et al.;Shinji Takeda(CP-PACS)
  • 通讯作者:
    Shinji Takeda(CP-PACS)
Light hadron spectrum in 2+1 flavor full QCD by CP-PACS and JLQCD Collaborations
CP-PACS 和 JLQCD 合作的 2 1 风味全 QCD 中的轻强子谱
  • DOI:
  • 发表时间:
    2005
  • 期刊:
  • 影响因子:
    0
  • 作者:
    Yasutake;N.;S.Aoki;T.Ishikawa et al.;T.Ishikawa
  • 通讯作者:
    T.Ishikawa
An Exact Algorithm for Any-flavor Lattice QCD with Kogut-Susskind Fermion
一种基于 Kogut-Susskind 费米子的任意类型格子 QCD 的精确算法
Light hadron spectroscopy in two-flavor QCD with small sea quark masses
小海夸克质量的双味 QCD 中的光强子光谱
  • DOI:
  • 发表时间:
    2004
  • 期刊:
  • 影响因子:
    0
  • 作者:
    K.Sadakane;T.Ohnishi;M.Ohkubo;Y.Takeda;Y.Takeda et al.;E.Shintani et al.;Tatsuyuki Takatsuka;S.Aoki;K.Sadakane et al.;Tatsuyuki Takatsuka;Y.Namekawa
  • 通讯作者:
    Y.Namekawa
Topological Susceptibility in Lattice QCD with Two Flavors of Dynamical Quarks
两种动力夸克晶格 QCD 的拓扑磁化率
  • DOI:
  • 发表时间:
    2001
  • 期刊:
  • 影响因子:
    0
  • 作者:
    A. Ali Khan;et al.
  • 通讯作者:
    et al.
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KANAYA Kazuyuki其他文献

KANAYA Kazuyuki的其他文献

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{{ truncateString('KANAYA Kazuyuki', 18)}}的其他基金

Study of QCD at finite temperature and finite density on the lattice with physical quark masses
具有物理夸克质量的晶格在有限温度和有限密度下的QCD研究
  • 批准号:
    21340049
  • 财政年份:
    2009
  • 资助金额:
    $ 2.37万
  • 项目类别:
    Grant-in-Aid for Scientific Research (B)
Non-perturbative study of QCD at finite temperatures and densities
有限温度和密度下 QCD 的非微扰研究
  • 批准号:
    17340066
  • 财政年份:
    2005
  • 资助金额:
    $ 2.37万
  • 项目类别:
    Grant-in-Aid for Scientific Research (B)
Renormalization group transformation in lattice QCD with quarks
夸克晶格 QCD 中的重正化群变换
  • 批准号:
    10640248
  • 财政年份:
    1998
  • 资助金额:
    $ 2.37万
  • 项目类别:
    Grant-in-Aid for Scientific Research (C)
Finite temperature transition in lattice QCD with the strange quark
奇夸克晶格 QCD 中的有限温度跃迁
  • 批准号:
    07640376
  • 财政年份:
    1995
  • 资助金额:
    $ 2.37万
  • 项目类别:
    Grant-in-Aid for Scientific Research (C)

相似国自然基金

Probing quark gluon plasma by heavy quarks in heavy-ion collisions
  • 批准号:
    11805087
  • 批准年份:
    2018
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    30.0 万元
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Various aspects of correlations in the quark-gluon plasma
夸克-胶子等离子体中相关性的各个方面
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加州大学戴维斯分校 STAR 和 CMS 的夸克胶子等离子体研究
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多部分子相互作用产生的微型夸克-胶子等离子体的研究
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用硬探针和电磁探针约束夸克胶子等离子体的特性
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