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arXiv 1504.05545hep-lathep-th
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最大阿贝尔规范中的格点量子色动力学格林函数:红外阿贝尔优势和夸克扇区

Lattice QCD Green's functions in maximally Abelian gauge: infrared Abelian dominance and the quark sector

Mario Schröck, Hannes Vogt

摘要:

在具有2+1动力学夸克味的格点规范场位形上,我们研究了最大阿贝尔加$U(1)_3\times U(1)_8$ Landau规范中动量空间夸克和胶子传播子.我们从格点连接变量中提取胶子场,并研究了对角和非对角胶子传播子。我们发现,横向对角胶子传播子的红外区是强烈增强相比,非对角传播子。Asqtad作用量的Dirac算符分别在对角和非对角胶子背景下被反演。与红外阿贝尔优势假设一致,我们发现非对角胶子背景几乎不产生任何非平凡的夸克动力学,而对角胶子背景的夸克传播子与朗道规范非常相似.

英文摘要:

On lattice gauge field configurations with 2+1 dynamical quark flavors, we investigate the momentum space quark and gluon propagators in the combined maximally Abelian plus $U(1)_3\times U(1)_8$ Landau gauge. We extract the gluon fields from the lattice link variables and study the diagonal and off-diagonal gluon propagators. We find that the infrared region of the transverse diagonal gluon propagator is strongly enhanced compared to the off-diagonal propagator. The Dirac operator from the Asqtad action is inverted on the diagonal and off-diagonal gluon backgrounds separately. In agreement with the hypothesis of infrared Abelian dominance, we find that the off-diagonal gluon background hardly gives rise to any non-trivial quark dynamics while the quark propagator from the diagonal gluon background closely resembles its Landau gauge counterpart.

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