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arXiv 1401.3151hep-lathep-ph
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真空排列和晶格伪像:交错费米子

Vacuum alignment and lattice artifacts: staggered fermions

Maarten Golterman, Yigal Shamir

摘要:

在限定的格点规范理论中,部分味群与附加的规范场弱耦合,弱规范场的动力学以及格点伪影都可能对味空间中真空的方向产生非平凡的影响。在这里,我们讨论这个问题的格点规范理论采用交错费米子。交错费米子打破了味对称性,使其在晶格上的群小得多,并且在味空间中的取向在连续统中是等价的,在晶格上可能是不同的。假设普适性,我们表明,在连续极限的弱规范味对称性总是矢量样,反驳了最近在文献中的说法。

英文摘要:

In confining lattice gauge theories in which part of the flavor group is coupled weakly to additional gauge fields, both the dynamics of the weak gauge fields as well as lattice artifacts may have non-trivial effects on the orientation of the vacuum in flavor space. Here we discuss this issue for lattice gauge theories employing staggered fermions. Staggered fermions break flavor symmetries to a much smaller group on the lattice, and orientations in flavor space that are equivalent in the continuum may be distinct on the lattice. Assuming universality, we show that in the continuum limit the weakly gauged flavor symmetries are always vector-like, disproving a recent claim in the literature.

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