Little strings on Dn orbifolds

Abstract

We explore two classes of 6d N= (1 0) little string theories obtained from type IIA/IIB NS5-branes probing Dn singularities. Their tensor branches are described by effective gauge theories whose instanton solitons are macroscopic little strings. We specifically study two families of 2d N= (0 4) gauge theories which describe at low energy the worldsheet dynamics of the type IIA/IIB little strings. These gauge theories are useful to calculate the supersymmetric partition functions of the little string theories on R4× T2. We establish the T-duality of the little string theories by utilizing their BPS spectra as a probe.