Renormalization of the Periodic Scalar Field Theory by Polchinski's Renormalization Group Method
Abstract
The renormalization group (RG) flow for the two-dimensional sine-Gordon model is determined by means of Polchinski's RG equation at next-to-leading order in the derivative expansion. In this work we have two different goals, (i) to consider the renormalization scheme-dependence of Polchinski's method by matching Polchinski's equation with the Wegner-Houghton equation and with the real space RG equations for the two-dimensional dilute Coulomb-gas, (ii) to go beyond the local potential approximation in the gradient expansion in order to clarify the supposed role of the field-dependent wave-function renormalization. The well-known Coleman fixed point of the sine-Gordon model is recovered after linearization, whereas the flow exhibits strong dependence on the choice of the renormalization scheme when non-linear terms are kept. The RG flow is compared to those obtained in the Wegner-Houghton approach and in the dilute gas approximation for the two-dimensional Coulomb-gas.
Keywords
Cite
@article{arxiv.hep-th/0202113,
title = {Renormalization of the Periodic Scalar Field Theory by Polchinski's Renormalization Group Method},
author = {I. Nandori and K. Sailer and U. D. Jentschura and G. Soff},
journal= {arXiv preprint arXiv:hep-th/0202113},
year = {2008}
}
Comments
14 pages, LaTeX, 1 figure; J. Phys. G (in press)