Wave-function renormalization for the Coulomb-gas in Wegner-Houghton's RG method

Abstract

The RG flow for the sine-Gordon model is determined by means of the method of Wegner and Houghton in next-to-leading order of the derivative expansion. For small values of the fugacity this agrees with the well-known RG flow of the two-dimensional Coulomb-gas found in the dilute gas approximation and a systematic way of obtaining higher-order corrections to this approximation is given.Comment: 4 pages, 2 figure