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arXiv 0706.2379hep-th
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有效Action的导数展开与重整化群方程

The Derivative Expansion of the Effective Action and the Renormalization Group Equation

F. A. Chishtie, Junji Jia, D. G. C. McKeon

摘要:

有效作用量的微扰计算可以用外场导数的幂来展开。我们将重整化群方程应用于有效作用量项,即外场导数中的二阶项和恒定外场中的所有阶项,考虑了无质量标量$ϕ_4^4$模型和无质量标量电动力学。一个所谓的“在壳层”重整化方案允许人们完全用适合于这个方案的重整化群函数来表示标量场的这个"动力学项“。这些重整化群函数可以与那些与最小减法相关的函数相关联。

英文摘要:

The perturbative evaluation of the effective action can be expanded in powers of derivatives of the external field. We apply the renormalization group equation to the term in the effective action that is second order in the derivatives of the external field and all orders in a constant external field, considering both massless scalar $ϕ_4^4$ model and massless scalar electrodynamics. A so-called ``on shell'' renormalization scheme permits one to express this ``kinetic term'' for the scalar field entirely in terms of the renormalization group functions appropriate for this scheme. These renormalization group functions can be related to those associated with minimal subtraction.

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