On Type II NS5-branes in the presence of an RR field

TL;DR

This paper investigates a non-commutative version of little string theory using Type II NS5-branes with an RR field, revealing unique decoupling limits and UV descriptions involving smeared D-branes.

Contribution

It introduces a novel decoupling limit for NS5-branes with RR fields and describes their UV behavior using smeared D-branes, extending understanding of non-commutative little string theories.

Findings

Decoupling limit for Type IIA NS5-branes requires wrapping on a circle.

In the IR, the theory flows to the ordinary (0,2) little string theory.

UV regime described by smeared D3/D2-branes in Type IIB/A string theory.

Abstract

In this letter we use Type II NS5-branes in the presence of an RR field at the decoupling limit to study a non-commutative version of little string theory. We shall see that the decoupling limit of NS5-branes in the presence of an RR field is completely different from the one we had in ordinary little string theory; in particular for Type IIA NS5-branes this decoupling limit can be defined only when the theory is wrapped on a circle, but nevertheless flows to the ordinary non-compact (0,2) theory at the IR limit. We also see that these theories, in the UV regime, where the non-commutative effects are important, can be described by smeared ordinary D3(D2)-branes in Type IIB(A) string theory.