String theory in AdS_3 x S^3 x T^4 with mixed flux: semiclassical and 1-loop phase in the S-matrix

TL;DR

This paper derives semiclassical and 1-loop dressing phases for string theory on AdS_3 x S^3 x T^4 with mixed flux, confirming recent proposals and elucidating the scattering matrix structure.

Contribution

It provides a semiclassical and 1-loop analysis of the dressing phases in the massive sector, connecting bound-state and elementary magnon descriptions in this background.

Findings

1-loop correction to dyonic giant magnon energy vanishes

Agreement with finite-gap and unitarity cut methods

Determination of the resolvent from scattering data

Abstract

We present a semiclassical derivation of the tree-level and 1-loop dressing phases in the massive sector of string theory on AdS_3 x S^3 x T^4 supplemented by R-R and NS-NS 3-form fluxes. In analogy with the AdS_5 x S^5 case, we use the dressing method to obtain scattering solutions for dyonic giant magnons which allows us to determine the semiclassical bound-state S-matrix and its 1-loop correction. We also find that the 1-loop correction to the dyonic giant magnon energy vanishes. Looking at the relation between the bound-state picture and elementary magnons in terms of the fusion procedure we deduce the elementary dressing phases. In both the semiclassical and 1-loop cases we find agreement with recent proposals from finite-gap equations and unitarity cut methods. Further, we find consistency with the finite-gap picture by determining the resolvent for the dyonic giant magnon from the semiclassical bosonic scattering data.