A pure Skyrme instanton

TL;DR

This paper explores a simplified, conformally invariant version of the Skyrme model in the infinite nucleon radius limit, explicitly constructing an instanton solution via symmetry reduction to a one-dimensional phi^4 model.

Contribution

It provides an explicit construction of a Skyrme instanton in the extreme limit, utilizing conformal invariance and symmetry reduction techniques.

Findings

Explicit instanton solution in the infinite radius limit

Reduction to a one-dimensional phi^4 model

Connection between kink solutions and instanton profiles

Abstract

The nuclear Skyrme model is considered in the extreme limit where the nucleon radius tends to infinity. In this limit only the Skyrme term in the action is significant. The model is then conformally invariant in dimension 4, and supports an instanton solution which can be constructed explicitly. The construction uses the conformal invariance and a certain symmetry reduction to reduce the model to the static phi^4 model in one dimension. The phi^4 kink solution gives the radial profile of the instanton, the kink position zero-mode corresponding to the instanton width.