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arXiv 1706.02702hep-thhep-lathep-ph
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库仑规范中QCD的哈密顿方法--近期结果综述

Hamiltonian approach to QCD in Coulomb gauge - a survey of recent results

H. Reinhardt, G. Burgio, D. Campagnari, E. Ebadati, J. Heffner, M. Quandt, P. Vastag, H. Vogt

摘要:

我报告最近的结果内的哈密顿方法库仑规范QCD。此外,这种方法相比,最近的晶格数据,这是通过另一种规范固定方法,并显示出改进的协议与连续的结果。通过将Gribov禁闭方案与禁闭的中心涡图像相关联,证明了库仑弦张力与空间弦张力相联系。对于夸克部门的真空波泛函明确包含耦合的夸克的横向胶子,并导致在变分方程是自由的紫外线发散。变分方法被扩展到有限的温度通过紧化的空间维度。从零温变分解计算了Polyakov环的有效势。对于纯杨-米尔斯理论,解禁闭相变对SU(2)为二级,对SU(3)为一级,与格点结果一致。相应的临界温度分别为$275 \, \mathrm{MeV}$和$280 \, \mathrm{MeV}$。当包含夸克时,解除禁闭的跃迁变成了交叉。从对偶夸克凝聚和手征夸克凝聚中,我们分别得到了$198 \, \mathrm{MeV}$和$170 \, \mathrm{MeV}$的伪临界温度,它们分别对应于去禁闭和手征跃迁.

英文摘要:

I report on recent results obtained within the Hamiltonian approach to QCD in Coulomb gauge. Furthermore this approach is compared to recent lattice data, which were obtained by an alternative gauge fixing method and which show an improved agreement with the continuum results. By relating the Gribov confinement scenario to the center vortex picture of confinement it is shown that the Coulomb string tension is tied to the spatial string tension. For the quark sector a vacuum wave functional is used which explicitly contains the coupling of the quarks to the transverse gluons and which results in variational equations which are free of ultraviolet divergences. The variational approach is extended to finite temperatures by compactifying a spatial dimension. The effective potential of the Polyakov loop is evaluated from the zero-temperature variational solution. For pure Yang--Mills theory, the deconfinement phase transition is found to be second order for SU(2) and first order for SU(3), in agreement with the lattice results. The corresponding critical temperatures are found to be $275 \, \mathrm{MeV}$ and $280 \, \mathrm{MeV}$, respectively. When quarks are included, the deconfinement transition turns into a cross-over. From the dual and chiral quark condensate one finds pseudo-critical temperatures of $198 \, \mathrm{MeV}$ and $170 \, \mathrm{MeV}$, respectively, for the deconfinement and chiral transition.

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