arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0806.4862hep-th
收藏

二维时空中具有非平凡边界条件或背景问题的重整化微扰理论

A Renormalized perturbation theory for problems with nontrivial boundary conditions or backgrounds in two space-time dimensions

Reza Moazzemi, Abdollah Mohammadi, Siamak S. Gousheh

摘要:

本文讨论了非平凡边界条件或背景(包括非微扰边界条件或背景)对二维系统重整化程序的影响。在这里,我们提出了一种替代重整化过程,使这些非微扰条件可以考虑在一个独立的,我们相信,自洽的方式。这些条件对系统的性质有着深远的影响,特别是它的所有$n$ -点函数。具体来说,我们调查这些影响在$λϕ^4$模型在两个维度,并表明,质量counterterterms原来是成比例的格林函数,在这些情况下,有非平凡的位置依赖。然后,我们计算在存在和不存在这些条件的质量反项之间的差异。我们发现,在非平凡的边界条件的情况下,这种差异是最小的边界之间和无限的。当边界趋于无穷大时,最小值接近于零。在非平凡背景的情况下,我们认为扭结的背景,并表明,差异再次是小的和本地化的扭结周围。

英文摘要:

In this paper we discuss the effects of nontrivial boundary conditions or backgrounds, including non-perturbative ones, on the renormalization program for systems in two dimensions. Here we present an alternative renormalization procedure such that these non-perturbative conditions can be taken into account in a self-contained and, we believe, self-consistent manner. These conditions have profound effects on the properties of the system, in particular all of its $n$-point functions. To be concrete, we investigate these effects in the $λϕ^4$ model in two dimensions and show that the mass counterterms turn out to be proportional to the Green's functions which have nontrivial position dependence in these cases. We then compute the difference between the mass counterterms in the presence and absence of these conditions. We find that in the case of nontrivial boundary conditions this difference is minimum between the boundaries and infinite on them. The minimum approaches zero when the boundaries go to infinity. In the case of nontrivial backgrounds, we consider the kink background and show that the difference is again small and localized around the kink.

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。

↑