International collaboration on the vacuum structure of full QCD using large-scale parallel computers

利用大规模并行计算机研究全QCD真空结构的国际合作

• 批准号: 15340073
• 负责人: SUZUKI Tsuneo
• 金额: $ 10.3万
• 依托单位: Kanazawa University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2003
• 资助国家: 日本
• 起止时间: 2003 至 2005
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-15340073/
• 关键词: monopole; quantum chromodynamics; quark confinement; monopole; color confinement; Lattice QCD; Monte Carlo Simulation; dual Meissner effect; dual Ginzburg-Landau theory; instanton; finite-temperature phase transition

The following results have been obtained mainly from Monte-Carlo simulation studies using SR8000 at KEK and SX7 at RIKEN :(1)DIK group study of finite-tenperature full QCD :International collaboration with DESY and ITEP groups. The phase transition temperature is determined on lattices of 16^3X8 and 24^3X10 using an 0(alpha) improved clover fermion action with Nf=2 light quarks. Using the previos data at Nt=4 and Mt=6,we have obtained for the first time the phase transition temperature in the chiral and the continuum limits, although the quark mass used is not light enough. We are continuing the simulations at lighter quark masses using a new BlueGene maschine at KEK.(2)Gauge invariance of the confinement mechanism :Confinement is a physical phenomenon and so there must be a gauge-invariant mechanism explaining confinement. Up to now abelian projection methods using some non-local gauges can explain the confinement beautifully as the dual Meissner effect.Using SX7 at Riken and performing an extensive Monte-Carlo simulations, we have found even in Landau gauge, the abelian dual Meissner effect works good. However in the gauge, there are no abelian monopoles, but instead the magnetic displacement currents squeezes the electric field.This kind of picture is expected to work in general and so we are doing simulations in various local gauges (known as a bad gauge) to check the expectation.

主要从KEK的SR8000和RIKEN的SX7的蒙特卡罗模拟研究中获得了以下结果：(1)有限温度全QCD的Dik小组研究：与DESY和ITEP小组的国际合作。在16^3x8和24^3x10晶格上，利用0(α)改进的三叶草费米子作用和Nf=2个轻夸克确定了相变温度。利用nT=4和mt=6的前人数据，我们首次得到了在手征极限和连续极限下的相变温度，尽管所用的夸克质量不够轻。我们正在KEK使用一种新的Bluegene Maschine继续对较轻夸克质量的模拟。(2)限制机制的规范不变性：限制是一种物理现象，因此必须有一种规范不变的机制来解释限制。到目前为止，使用一些非局域规范的阿贝尔投影方法可以很好地解释禁闭为双迈斯纳效应，我们使用RIEKN的SX7并进行了大量的蒙特卡罗模拟，我们已经发现即使在朗道规范中，阿贝尔双重迈斯纳效应也是很好的。然而，在压力计中，没有阿贝尔单极子，而是磁位移电流挤压了电场。这种图景有望在一般情况下工作，所以我们在各种局部压力计(称为坏压力计)上进行模拟，以检查预期。

项目成果

Baryonic Flux in Quenched and Two-Flavor Dynamical QCD

淬火和二味动态 QCD 中的重子通量

• 发表时间: 2004
• 期刊: Phys.Rev. D70
• 作者: K. Ishikawa;N. Maeda;V.G.Bornyakov et al.
• 通讯作者: V.G.Bornyakov et al.

Determination of monopole condensate from monopole action in quenched SU(2) QCD

通过淬灭 SU(2) QCD 中的单极作用测定单极凝聚

• 发表时间: 2004
• 期刊: Phys. Rev. D69
• 作者: M.N.Chernodub;K.Ishiguro;T.Suzuki
• 通讯作者: T.Suzuki

Matter degrees of freedom and string breaking in Abelian projected quenched SU(2) QCD

阿贝尔投影淬火 SU(2) QCD 中的物质自由度和弦断裂

• 发表时间: 2004
• 期刊: Phys.Rev.D 70
• 作者: M.N.Chernodub;Koichi Hashimoto;Tsuneo Suzuki
• 通讯作者: Tsuneo Suzuki

M.N.Chernodub et al.: "Numerical determination of monopole entropy in pure SU(2) QCD"Phys.Rev.. D69. 014509 (2004)

M.N.Chernodub 等人：“纯 SU(2) QCD 中单极熵的数值测定”Phys.Rev..D69。

Shoichi Ito et al.: "Gauge Problem of Monopole Dynamics in SU(2) Lattice Gauge Theory"Phys.Rev.. D67. 074504 (2003)

Shoichi Ito 等人：“SU(2) 晶格规范理论中单极子动力学的规范问题”Phys.Rev.. D67。