Abstract
We explore two classes of 6d mathcal{N}=left(1,0right) 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 mathcal{N}=left(0,4right) 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.
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