Universality in the exact renormalization group: comparison to perturbation theory
arXiv:2304.00597 · doi:10.3390/universe9090409
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 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.
arXiv comment11 pages; new case studied, references added; normalization error corrected, with significant changes
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