Relativistic limit on the $AdS_3 \times S^3 \times S^3 \times S^1$ string worldsheet

TL;DR

This paper investigates the relativistic limit of the worldsheet S matrix for strings in the $AdS_3 imes S^3 imes S^3 imes S^1$ background with mixed fluxes, confirming consistency with recent theoretical proposals.

Contribution

It provides a complete S-matrix bootstrap including dressing factors for fundamental particles and bound states in this specific string theory background.

Findings

Results agree with recent relativistic limit proposals.

Complete S-matrix including dressing factors derived.

Consistent with theoretical expectations for mixed flux backgrounds.

Abstract

We study the relativistic limit of the worldsheet S matrix of $AdS_3 \times S^3 \times S^3 \times S^1$ strings in the presence of mixed Ramond-Ramond (RR) and Neveu-Schwarz-Neveu-Schwarz (NS-NS) flux, and complete the S-matrix bootstrap including the dressing factors for fundamental particles and bound states. Our results agree with the relativistic limit of the recent proposal arXiv:2512.07721.