Nonperturbative infrared finiteness in super-renormalisable scalar quantum field theory

Abstract

We present a study of the IR behaviour of a three-dimensional super-renormalisable quantum field theory (QFT) consisting of a scalar field in the adjoint of $SU(N)$ with a ${\phi }^4$ interaction. A bare mass is required for the theory to be massless at the quantum level. In perturbation theory the critical mass is ambiguous due to infrared (IR) divergences and we indeed find that at two-loops in lattice perturbation theory the critical mass diverges logarithmically. It was conjectured long ago in [Jackiw 1980, Appelquist 1981] that super-renormalisable theories are nonperturbatively IR finite, with the coupling constant playing the role of an IR regulator. Using a combination of Markov-Chain-Monte-Carlo simulations of the lattice-regularised theory, both frequentist and Bayesian data analysis, and considerations of a corresponding effective theory we gather evidence that this is indeed the case.

arXiv commentVersion accepted for publication in PRL, added references, updated plots, extended discussion of IR behaviour in perturbation theory and EFT

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• Phase Transitions in Particle Physics -- Results and Perspectives from Lattice Quantum Chromo-Dynamics
• First-order electroweak phase transitions: a nonperturbative update
• Renormalisation of IR divergences and holography in de Sitter
• Lower bound on the cosmological constant from the classicality of the Early Universe
• Renormalization of the energy-momentum tensor in three-dimensional scalar $SU(N)$ theories using the Wilson flow
• Cancellation of IR Divergences in 3d Abelian Gauge Theories