The low-energy limit of AdS$_3$/CFT$_2$ and its TBA

Understand

We investigate low-energy string excitations in AdS$_3\times$S$^3\times$T$^4$.

• When the worldsheet is decompactified, the theory has gapless modes whose spectrum at low energies is determined by massless relativistic integrable S matrices of the type introduced by Al.
• B.
• Zamolodchikov.