Revisiting the tensionless limit of pure-Ramond-Ramond AdS3/CFT2

TL;DR

This paper numerically analyzes the mirror TBA equations for tensionless pure-Ramond-Ramond strings on AdS3/CFT2, revealing non-relativistic, interacting massless dynamics distinct from symmetric-product orbifold CFTs.

Contribution

It introduces a modified dressing factor approach to solve the TBA equations in the tensionless limit, highlighting new non-relativistic interactions of massless modes.

Findings

Massless excitations dominate the tensionless dynamics.

The dynamics are non-relativistic and interacting.

Results differ from symmetric-product orbifold CFT expectations.

Abstract

We revisit the numerical solution of the mirror TBA equations for pure--Ramond-Ramond strings on $AdS_3\times S^3\times T^4$ in the tensionless limit. Our analysis uses the recently-proposed modification of the dressing factors which account for non-trivial exchange relations of the massless modes. At leading order in the tension, the dynamics is driven by the massless excitations associated to $T^4$ modes and their superpartners, but it is non-relativistic and interacting unlike what happens in the symmetric-product orbifold CFT of $T^4$.