Achiral boundaries and the twisted Yangian of the D5-brane

TL;DR

This paper reveals the hidden achiral twisted Yangian symmetry in integrable field theories with achiral boundaries, specifically in the context of AdS/CFT string scattering off a D5-brane, connecting old models to modern string theory insights.

Contribution

It identifies and constructs the achiral twisted Yangian algebra as the underlying symmetry in this integrable boundary setting, linking past models to contemporary string theory.

Findings

Achiral boundary conditions lead to a twisted Yangian symmetry.

The algebra is realized in the scattering of superstring excitations off a D5-brane.

Connects classical models to modern integrable string theory frameworks.

Abstract

We consider integrable field theories with achiral boundary conditions and uncover the underlying achiral twisted Yangian algebra. This construction arises from old work on the bosonic principal chiral model on a half-line, but finds a modern realization as the hidden symmetry in the planar limit of the scattering of worldsheet excitations of the AdS/CFT light-cone superstring off a D5-brane.