Affiliation:
1. Applied Physics Department, ETSIAE, Universidad Politécnica de Madrid, E-28040 Madrid, Spain
Abstract
Various formulations of the exact renormalization group can be compared in the perturbative domain, in which we have reliable expressions for regularization-independent (universal) quantities. We consider the renormalization of the λϕ4 theory in three dimensions and make a comparison between the sharp-cutoff regularization method and other more recent methods. They all give good results, which only differ by small non-universal terms.
Subject
General Physics and Astronomy