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arXiv 2109.13684hep-thmath-phmath.MP
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最小减除方案中的Dyson-Schwinger方程

Dyson-Schwinger Equations in Minimal Subtraction

Paul-Hermann Balduf

AI总结:

本研究对比了MS与MOM重整化方案下单尺度Dyson-Schwinger方程的解,推导了重整化点平移量与重整化群函数等的关系,通过三类实例分析线性与非线性方程的平移特性,还给出了玩具模型非线性方程的试探精确非微扰解。

摘要:

我们将最小减除(MS)方案下一单尺度Dyson-Schwinger方程的解与运动学(MOM)重整化方案下的解进行了对比。我们证实,MS方案的解可被解释为一种MOM方案的解,但对应着一个发生平移的重整化点,该平移量本身是耦合常数的函数。我们推导了微扰论中这一平移量与各类重整化群函数、抵消项之间的关系。作为具体实例,我们研究了三种不同的单尺度Dyson-Schwinger方程:一种基于D=4多边图,一种针对D=6多边图,还有一种是数学玩具模型。针对每一种积分核,我们都考察了线性形式以及九种不同的非线性Dyson-Schwinger方程。对于线性情形,我们通过经验找到了MOM与MS重整化点之间平移量的精确函数形式。对于非线性DSE,平移量的结果表明其对应一个阶乘发散的幂级数。我们确定了其主导渐近增长参数,发现这些参数与反常维度的参数一致。最后,我们给出了玩具模型中某一非线性DSE的一个试探性精确非微扰解。

英文摘要:

We compare the solutions of one-scale Dyson-Schwinger equations in the Minimal subtraction (MS) scheme to the solutions in kinematic (MOM) renormalization schemes. We establish that the MS-solution can be interpreted as a MOM-solution, but with a shifted renormalization point, where the shift itself is a function of the coupling. We derive relations between this shift and various renormalization group functions and counter terms in perturbation theory. As concrete examples, we examine three different one-scale Dyson-Schwinger equations, one based on the D=4 multiedge graph, one for the D=6 multiedge graph and one mathematical toy model. For each of the integral kernels, we examine both the linear and nine different non-linear Dyson-Schwinger equations. For the linear cases, we empirically find exact functional forms of the shift between MOM and MS renormalization points. For the non-linear DSEs, the results for the shift suggest a factorially divergent power series. We determine the leading asymptotic growth parameters and find them in agreement with the ones of the anomalous dimension. Finally, we present a tentative exact non-perturbative solution to one of the non-linear DSEs of the toy model.

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