标题： 胶子凝聚和QCD的运行耦合 显示英文标题

标题： The Gluon Condensate and Running Coupling of QCD

摘要： 量子电动力学中光子凝聚的表达式被提出，并推广以推导出量子色动力学（QCD）中胶子凝聚与运行耦合常数之间的简单关系。 定义凝聚的歧义性被讨论。 将文献中一些关于运行耦合常数的假设所得到的胶子凝聚值与从QCD求和规则确定的值进行比较。 显示英文摘要

摘要： An expression for the photon condensate in quantum electrodynamics is presented and generalized to deduce a simple relation between the gluon condensate and the running coupling constant of quantum chromodynamics (QCD). Ambiguities in defining the condensates are discussed. The values of the gluon condensate from some Ans\"{a}tze for the running coupling in the literature are compared with the value determined from QCD sum rules.