Differential Renormalization of Scalar Field Theory in the Background-Field Method
Yaw-Hwang Chen, Min-Tsung He, Su-Long Nyeo
Abstract
We introduce an approach for calculating the quantum loop corrections in the ϕ4 theory. Differential regularization and background-field method are essential tools and are used to calculate the effective action of the theory to two-loop order. Our approach is considerably simpler than other known methods and can be readily extended to higher-loop calculations and to other models.
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