Comment on prescription problem in light-cone gauge

TL;DR

This paper clarifies that recent causal prescriptions for handling singularities in light-cone gauge theories are equivalent to the well-known Mandelstam-Leibbrandt prescription, unifying different approaches.

Contribution

It demonstrates the equivalence of various causal prescriptions with the Mandelstam-Leibbrandt prescription in light-cone gauge theories.

Findings

Causal principal value and causal prescriptions are equivalent to Mandelstam-Leibbrandt.

Unification of different singularity handling methods in light-cone gauge.

Clarification of the nature of spurious singularities.

Abstract

Recently suggested causal principal value and causal prescriptions for the "spurious singularity" in light-cone gauge theories are nothing but the different guises of usual Mandelstam-Leibbrandt prescription.