Large N Domain Walls as D-branes for ${\cal N}=1$ QCD String

TL;DR

This paper constructs explicit BPS domain walls in large N supersymmetric SU(N) gauge theory, interpreting some as D-branes for SQCD strings, and analyzes their shapes and consistency within the string theory framework.

Contribution

It provides the exact shapes of large N domain walls and supports their interpretation as D-branes in SQCD string theory, advancing understanding of non-perturbative gauge dynamics.

Findings

Exact shapes of large N domain walls derived

Domain walls interpreted as D-branes for SQCD strings

Supports D-brane interpretation within string theory context

Abstract

We consider a model which in a certain limit reduces to the large N ${\cal N}=1$ supersymmetric SU(N) gauge theory without matter. The gaugino condensate in this model is controlled by the dynamics of an additional singlet superfield. Using this model we explicitly construct BPS domain walls arising due to the chiral symmetry breaking. In particular, in the large N limit we obtain the exact shapes of the domain walls corresponding to solitons, and also of the domain walls interpreted as D-branes on which the SQCD string can end, whose existence was previously argued by Witten in the context of the large N SQCD. We also discuss various points which appear to support the consistency of the D-brane interpretation for these domain walls within the SQCD string context.