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arXiv 1902.08894hep-th
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从胶子禁闭观点看杨-米尔斯理论的反射正性和复分析

Reflection positivity and complex analysis of the Yang-Mills theory from a viewpoint of gluon confinement

Kei-Ichi Kondo, Masaki Watanabe, Yui Hayashi, Ryutaro Matsudo, Yutaro Suda

摘要:

为了理解Landau规范下Yang-Mills理论的束缚解,我们考虑了有质量的Yang-Mills模型,该模型是在Yang-Mills理论中加入一个胶子质量项和Lorentz协变的规范固定项以及相应的Faddeev-Popov鬼项。首先,我们证明了有质量Yang-Mills模型是规范不变扩展理论的规范固定版本,规范不变扩展理论与规范群基本表象中具有单一固定模标量场的规范标量模型是一致的。这种等价性是通过一位作者最近提出的Brout-Englert-Higgs机制的规范无关描述得到的。然后,我们再次确认,通过数值模拟得到的朗道规范的欧几里德胶子和鬼传播子的晶格上再现了良好的精度从大规模的杨-米尔斯模型,考虑到单圈量子修正。此外,我们证明了在数值的方式,从胶子传播子在欧几里德区域计算的Schwinger函数表现出违反的反射正性的参数的物理点。此外,我们还对胶子传播子进行了从欧几里得区域到复动量平面到闵可夫斯基区域的解析延拓。我们给出了一个解析证明,在有质量的Yang-Mills模型中,由于存在一对复共轭极点和胶子传播子的谱函数的负性,任何参数的选择都违反了反射正性.传播子的复杂结构使我们能够解释为什么在欧几里德区域的胶子传播子是很好地描述的Gribov-Stingl形式。

英文摘要:

In order to understand the confining decoupling solution of the Yang-Mills theory in the Landau gauge, we consider the massive Yang-Mills model which is defined by just adding a gluon mass term to the Yang-Mills theory with the Lorentz-covariant gauge fixing term and the associated Faddeev-Popov ghost term. First of all, we show that massive Yang-Mills model is obtained as a gauge-fixed version of the gauge-invariantly extended theory which is identified with the gauge-scalar model with a single fixed-modulus scalar field in the fundamental representation of the gauge group. This equivalence is obtained through the gauge-independent description of the Brout-Englert-Higgs mechanism proposed recently by one of the authors. Then, we reconfirm that the Euclidean gluon and ghost propagators in the Landau gauge obtained by numerical simulations on the lattice are reproduced with good accuracy from the massive Yang-Mills model by taking into account one-loop quantum corrections. Moreover, we demonstrate in a numerical way that the Schwinger function calculated from the gluon propagator in the Euclidean region exhibits violation of the reflection positivity at the physical point of the parameters. In addition, we perform the analytic continuation of the gluon propagator from the Euclidean region to the complex momentum plane towards the Minkowski region. We give an analytical proof that the reflection positivity is violated for any choice of the parameters in the massive Yang-Mills model, due to the existence of a pair of complex conjugate poles and the negativity of the spectral function for the gluon propagator to one-loop order. The complex structure of the propagator enables us to explain why the gluon propagator in the Euclidean region is well described by the Gribov-Stingl form.

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