Lambert-W solves the noncommutative $\Phi^4$-model

TL;DR

This paper derives an exact solution for the noncommutative $\

Contribution

It introduces a novel approach using Lambert's $W$-function to solve the Dyson-Schwinger equation in the noncommutative $\

Findings

Exact formula for the 2-point function solution

Solution holomorphic in $\\lambda$ within a specific domain

Application of Hilbert transform and resummation techniques

Abstract

The closed Dyson-Schwinger equation for the 2-point function of the noncommutative $\lambda \phi^4_2$-model is rearranged into the boundary value problem for a sectionally holomorphic function in two variables. We prove an exact formula for a solution in terms of Lambert's $W$-function. This solution is holomorphic in $\lambda$ inside a domain which contains $(-1/\log 4,\infty)$. Our methods include the Hilbert transform, perturbation series and Lagrange-B\"urmann resummation.