Universality in the exact renormalization group: comparison to perturbation theory

Autor: Gaite, Jose
Rok vydání: 2023
Předmět:
Zdroj: Universe 2023, 9, 409
Druh dokumentu: Working Paper
DOI: 10.3390/universe9090409
Popis: 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 $\lambda\phi^4$ 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.
Comment: 11 pages; new case studied, references added; normalization error corrected, with significant changes
Databáze: arXiv
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