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Minimal renormalization without ε expansion: Critical behavior above and below Tc

R. Schloms and V. Dohm

  • Institut für Theoretische Physik, Technische Hochschule Aachen, D-5100 Aachen, Federal Republic of Germany

Phys. Rev. B 42, 6142 – Published 1 October, 1990Erratum Phys. Rev. B 46, 5883 (1992)

DOI: https://doi.org/10.1103/PhysRevB.42.6142

Abstract

We present a field-theoretic renormalization-group treatment of the critical behavior of the cphi4 model within the minimal-subtraction scheme at fixed dimension d<4. We show that correlation functions above and below Tc can be calculated within this renormalization scheme without using the ε=4-d expansion. This is demonstrated for the specific heat, for the order parameter, and for the superfluid density (stiffness constant). Various asymptotic amplitudes and correction amplitudes are determined, and some of their universal ratios are calculated in three dimensions. Our result for ac/aρs eliminates a previous error of the ε expansion regarding the sign of this ratio for d=3 and n=2.

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