Two-parameter scaling of correlation functions near continuous phase transitions
Statistical Mechanics
2008-02-28 v3 High Energy Physics - Theory
Abstract
We discuss the order parameter correlation function in the vicinity of continuous phase transitions using a two-parameter scaling form G(k) = k_c^{-2} g(k\xi,k/k_c), where k is the wave-vector, \xi is the correlation length, and the interaction-dependent non-universal momentum scale k_c remains finite at the critical fixed point. The correlation function describes the entire critical regime and captures the classical to critical crossover. One-parameter scaling is recovered only in the limit k/k_c->0. We present an approximate calculation of g(x,y) for the Ising universality class using the functional renormalization group.
Cite
@article{arxiv.0705.4462,
title = {Two-parameter scaling of correlation functions near continuous phase transitions},
author = {Nils Hasselmann and Andreas Sinner and Peter Kopietz},
journal= {arXiv preprint arXiv:0705.4462},
year = {2008}
}