Universality in the Exact Renormalization Group: Comparison to Perturbation Theory

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.

Note:

11 pages; new case studied, references added; normalization error corrected, with significant changes

renormalization group
universality
nonperturbative field theory
mass: renormalization
dimension: 3
regularization
renormalization group
universality
perturbation theory
phi**n model: 4

References(32)

Figures(0)

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