Four-point renormalized coupling constant in O(N) models

TL;DR

This paper investigates the renormalized four-point coupling in O(N) models using 1/N expansion and strong coupling methods, providing new precise estimates for critical couplings across dimensions and N values.

Contribution

It introduces explicit calculations of the 1/N correction to the beta function and fixed point, and compares large-N and strong coupling results for the first time.

Findings

Good agreement between large-N and strong coupling results.

Strong coupling analysis provides the most accurate small-N estimates to date.

Results are consistent with Monte Carlo and phi^4 theory in 2D and 3D.

Abstract

The renormalized zero-momentum four-point coupling $g_r$ of $O(N)$-invariant scalar field theories in $d$ dimensions is studied by applying the $1/N$ expansion and strong coupling analysis. The $O(1/N)$ correction to the $\beta$-function and to the fixed point value $g_r^*$ are explictly computed. Strong coupling series for lattice non-linear $\sigma$ models are analyzed near criticality in $d=2$ and $d=3$ for several values of $N$ and the corresponding values of $g_r^*$ are extracted. Large-$N$ and strong coupling results are compared with each other, finding a good general agreement. For small $N$ the strong coupling analysis in 2-d gives the best determination of $g^*_r$ to date (or comparable for $N=2,3$ with the available Monte Carlo estimates), and in 3-d it is consistent with available $\phi^4$ field theory results.