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arXiv 1204.3497hep-thquant-ph
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δ函数势中相互作用标量场的重整化和真空能

Renormalization and vacuum energy for an interacting scalar field in a δ-function potential

David J. Toms

摘要:

研究了δ函数背景势下自相互作用标量场理论。表面相互作用的作用,在获得一个重正化的理论强调,并证明了一个双循环计算。采用量纲正则化和背景场方法计算了必要的平衡项。我们还计算了在δ函数势存在的情况下,非单连通时空中复标量场的有效势。的有效势被评估为一个任意的相位因子的函数与非简单连接的时空中的边界条件的选择。我们得到的结果为大和小δ-函数强度的渐近展开,并强调如何小强度结果的非分析性质vitiates任何分析的基础上,标准的弱场微扰理论。

英文摘要:

We study a self-interacting scalar field theory in the presence of a δ-function background potential. The role of surface interactions in obtaining a renormalizable theory is stressed and demonstrated by a two-loop calculation. The necessary counterterms are evaluated by adopting dimensional regularization and the background field method. We also calculate the effective potential for a complex scalar field in a non-simply connected spacetime in the presence of a δ-function potential. The effective potential is evaluated as a function of an arbitrary phase factor associated with the choice of boundary conditions in the non-simply connected spacetime. We obtain asymptotic expansions of the results for both large and small δ-function strengths, and stress how the non-analytic nature of the small strength result vitiates any analysis based on standard weak field perturbation theory.

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