Demystifying the Massless Sector in AdS_3 Quantum Spectral Curve

TL;DR

This paper analyzes the Quantum Spectral Curve for AdS3 x S3 x T4, revealing a broader solution space in the large-volume limit and deriving finite Bethe equations for massive and massless particles.

Contribution

It demonstrates that the QSC has a wider class of solutions in the large-volume limit and derives finite Bethe equations for both particle types.

Findings

Broader solution class for QSC in large-volume limit

Finite Bethe equations for massive and massless particles

More constraining dressing phase conditions

Abstract

We show that in the asymptotic large-volume limit, the original proposal for Quantum Spectral Curve for AdS3 x S3 x T4 with R-R flux has a wider class of solutions, than studied previously. We argue that in this limit the QSC reduces to a finite set of Bethe equations for both massive and massless particle types. We also find that the QSC imposes more constraining conditions on the dressing phases than previously known and we present solutions of those equations.