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arXiv 0806.2817hep-ph
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时间欧氏空间中的夸克Schwinger-Dyson方程

Quark Schwinger-Dyson equation in temporal Euclidean space

V. Sauli, Z. Batiz

摘要:

本文提出了一种非微扰的初等方法来获得类时动量的格林函数。我们假设在空间动量分量的复平面的第一和第三象限中没有奇点,并执行威克旋转的3D模拟。这个过程定义了类时欧氏空间中的格林函数。作为一个例子,我们考虑在QCD的夸克传播子。而对于弱耦合,这种方法显然等价于微扰理论,对于实际的QCD耦合,即使在标准微扰阈值以下,夸克质量和重整化波函数的复杂部分也能自发产生。因此,我们的方法有利于限制机制的基础上缺乏真正的极点。

英文摘要:

We present an elementary nonperturbative method to obtain Green's functions (GFs) for timelike momenta. We assume there are no singularities in the first and third quadrants of the complex plane of space momentum components and perform a 3d analogue of Wick rotation. This procedure defines Greens functions in a timelike Euclidean space. As an example we consider the quark propagator in QCD. While for weak coupling, this method is obviously equivalent to perturbation theory, for a realistic QCD coupling a complex part of the quark mass and renormalization wave function has been spontaneously generated even below the standard perturbative threshold. Therefore, our method favors a confinement mechanism based on the lack of real poles.

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