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arXiv 0812.3842hep-th
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库仑规范鬼传播子与库仑势

Coulomb gauge ghost propagator and the Coulomb potential

M. Quandt, G. Burgio, S. Chimchinda, H. Reinhardt

摘要:

利用改进的规范固定方案,考虑了剩余对称性,计算了格点库仑规范中的鬼传播子和库仑势。这种设置已被证明是必不可少的,以解释在瞬时胶子传播子的标度违反。我们发现,无论是鬼传播和库仑势是不敏感的Gribov问题或剩余的规范固定的细节,即使库仑势是从A0-传播,而不是库仑核评估。特别是,在这两个量中,都没有发现标度违反的迹象,至少远低于数值精度,而这些违反对于胶子传播子是可见的。从A0-传播子的库仑势示出与从库仑核评估的(形式上等价的)表达式定性一致。

英文摘要:

The ghost propagator and the Coulomb potential are evaluated in Coulomb gauge on the lattice, using an improved gauge fixing scheme which includes the residual symmetry. This setting has been shown to be essential in order to explain the scaling violations in the instantaneous gluon propagator. We find that both the ghost propagator and the Coulomb potential are insensitive to the Gribov problem or the details of the residual gauge fixing, even if the Coulomb potential is evaluated from the A0--propagator instead of the Coulomb kernel. In particular, no signs of scaling violations could be found in either quantity, at least to well below the numerical accuracy where these violations were visible for the gluon propagator. The Coulomb potential from the A0-propagator is shown to be in qualitative agreement with the (formally equivalent) expression evaluated from the Coulomb kernel.

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