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arXiv 0705.1483hep-th
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N=4平面超Yang-Mills理论的实与复β变形

Real versus complex beta-deformation of the N=4 planar super Yang-Mills theory

Federico Elmetti, Andrea Mauri, Silvia Penati, Alberto Santambrogio, Daniela Zanon

摘要:

这是我们在第七/0606125号论文中研究的{ \cal N}=1 SU(N)SYM理论的续篇,该理论是{ \cal N}=4理论的边缘变形,具有复变形参数β和平面极限。在那里,我们已经讨论了共形不变性使理论成为有限的问题,我们发现有限性要求变形参数β的真实性。在本文中,我们放松了有限性要求,并寻找一个理论,在平面极限有消失的β函数。我们进行显式计算高达五个循环顺序:我们发现,β函数消失的条件可以实现一个复杂的变形参数,但理论是不有限的,结果取决于任意选择的减法程序。因此,虽然有限性条件导致一个方案独立的结果,使保形不变理论与真正的变形是物理定义良好,条件消失β函数导致一个结果,这是方案依赖,因此意义不明。为了表明这些发现是不是一个人工制品的维正则化,我们确认我们的结果内的微分重整化方法。

英文摘要:

This is a sequel of our paper hep-th/0606125 in which we have studied the {\cal N}=1 SU(N) SYM theory obtained as a marginal deformation of the {\cal N}=4 theory, with a complex deformation parameter βand in the planar limit. There we have addressed the issue of conformal invariance imposing the theory to be finite and we have found that finiteness requires reality of the deformation parameter β. In this paper we relax the finiteness request and look for a theory that in the planar limit has vanishing beta functions. We perform explicit calculations up to five loop order: we find that the conditions of beta function vanishing can be achieved with a complex deformation parameter, but the theory is not finite and the result depends on the arbitrary choice of the subtraction procedure. Therefore, while the finiteness condition leads to a scheme independent result, so that the conformal invariant theory with a real deformation is physically well defined, the condition of vanishing beta function leads to a result which is scheme dependent and therefore of unclear significance. In order to show that these findings are not an artefact of dimensional regularization, we confirm our results within the differential renormalization approach.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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