Spinning strings: λ-deformation and non-Abelian T-dual limit

The simplest example of the λ-deformation connects SU(2) Wess-Zumino-Witten model with non-Abelian T-dual (NATD) principal chiral model. We analyze spinning strings one spin propagating through truncation an S-dual embedding target space into type IIB supergravity. show that situation apart from NATD limit parallels undeformed case. demonstrate regular are either folded or circular, and nearly degenerate point-like, fast, slow. effects both overall increment energy enlargement gap between energies circular strings. In limit, we prove disappear fast realize dispersion relation Gubser-Klebanov-Polyakov