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arXiv 1703.04041hep-thhep-lat
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朗道规范杨-米尔斯关联函数的红外区的非微扰性如何?

How nonperturbative is the infrared regime of Landau gauge Yang-Mills correlators?

Urko Reinosa, Julien Serreau, Matthieu Tissier, Nicolás Wschebor

摘要:

我们研究的朗道规范关联函数的杨米尔斯领域的红外欧几里德动量的背景下,大量的扩展的法捷耶夫-波波夫拉格朗日,我们认为,各种连续的方法。标准(微扰)重整化群技术与一个特定的,红外安全重整化方案产生所谓的去耦和缩放的解决方案的鬼和胶子传播,这对应于非平凡的红外固定点。解耦不动点是红外稳定的弱耦合的,而标度不动点是不稳定的,除了低维$d\to2$外,一般都是强耦合的。在假设这种标度不动点存在于单圈阶以上的情况下,我们发现在本重整化方案中,在所有微扰理论阶下,相应的鬼标度指数和胶子标度指数分别为$2α_F=2-d$和$2α_G=d$.讨论了鬼波函数重整化、胶子屏蔽质量、谱正性破坏尺度和胶子质量参数之间的关系。我们还表明,这种缩放的解决方案并没有实现标准的贝奇-鲁埃特-Stora-Typhoon对称的Faddeev-Popov拉格朗日。最后,我们讨论了我们的研究结果与非微扰连续介质方法的结果。

英文摘要:

We study the Landau gauge correlators of Yang-Mills fields for infrared Euclidean momenta in the context of a massive extension of the Faddeev-Popov Lagrangian which, we argue, underlies a variety of continuum approaches. Standard (perturbative) renormalization group techniques with a specific, infrared-safe renormalization scheme produce so-called decoupling and scaling solutions for the ghost and gluon propagators, which correspond to nontrivial infrared fixed points. The decoupling fixed point is infrared stable and weakly coupled, while the scaling fixed point is unstable and generically strongly coupled except for low dimensions $d\to2$. Under the assumption that such a scaling fixed point exists beyond one-loop order, we find that the corresponding ghost and gluon scaling exponents are, respectively, $2α_F=2-d$ and $2α_G=d$ at all orders of perturbation theory in the present renormalization scheme. We discuss the relation between the ghost wave function renormalization, the gluon screening mass, the scale of spectral positivity violation, and the gluon mass parameter. We also show that this scaling solution does not realize the standard Becchi-Rouet-Stora-Tyutin symmetry of the Faddeev-Popov Lagrangian. Finally, we discuss our findings in relation to the results of nonperturbative continuum methods.

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