Application of a light-front coupled cluster method

TL;DR

This paper applies a novel light-front coupled-cluster method to quantum electrodynamics, demonstrating its effectiveness in nonperturbative calculations of the dressed-electron state and the anomalous magnetic moment, while addressing divergence issues.

Contribution

It introduces and tests a new light-front coupled-cluster approach for gauge theories, improving divergence handling and Fock-sector independence in nonperturbative QED calculations.

Findings

Successful nonperturbative construction of the dressed-electron state.

Accurate computation of the electron's anomalous magnetic moment.

Resolution of divergence issues present in Fock-space truncation methods.

Abstract

As a test of the new light-front coupled-cluster method in a gauge theory, we apply it to the nonperturbative construction of the dressed-electron state in QED, for an arbitrary covariant gauge, and compute the electron's anomalous magnetic moment. The construction illustrates the spectator and Fock-sector independence of vertex and self-energy contributions and indicates resolution of the difficulties with uncanceled divergences that plague methods based on Fock-space truncation.