Infrared physics of the 3D SU(2) adjoint Higgs model at the crossover transition

TL;DR

This paper investigates the infrared properties of the 3D SU(2) adjoint Higgs model during a crossover transition, revealing monopole behavior and photon mass relations using lattice simulations and gradient flow techniques.

Contribution

It introduces a lattice Monte Carlo approach combined with gradient flow to renormalize monopole density and explores the monopole-photon mass relationship in the Higgs regime.

Findings

Monopole density is proportional to the square of the photon mass.

Gradient flow effectively renormalizes divergent monopole densities.

Results provide insights into the Higgs regime near crossover, relevant for BSM theories.

Abstract

We study the crossover phase transition of the SU(2) Georgi-Glashow model in three dimensions. In this model, a confining condensate of topological 't Hooft-Polyakov monopoles exists in the Higgs regime. We use lattice Monte Carlo simulations to study the monopole gas across a crossover transition, and demonstrate that gradient flow can be used to renormalize the otherwise divergent monopole number density. The condensation of the monopoles means that the theory admits also a massive photon-like excitation. We show that the renormalized monopole number density is approximately proportional to the square of the photon mass, in agreement with semiclassical results. Our results give insight into behaviour of the Higgs regime near crossover, which has boarder implications for beyond the Standard Model theories containing adjoint scalar fields.