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Classic holographic correspondences are motivated from string theory by describing the physics near a stack of D-branes in two different sets of variables and taking a low-energy limit. When an additional D-brane intersects this stack orthogonally and the same limit is taken, one finds a generalization of AdS/CFT, known as the defect AdS/CFT correspondence. In defect AdS/ CFT, an ambient field theory coupled to a defect is dual to string theory in an AdS background containing a probe brane that extends to the boundary. If multiple coincident D-branes intersect the original stack and the same limit is taken, the resulting coincident probe branes in the AdS background will host a nonabelian gauge theory on a manifold with boundary. I describe a class of theories that arise in this fashion -- in particular, their vacuum structure -- and how holography could be used to study instanton-like field configurations within them. This talk is based on work done in collaboration with Sophia Domokos.

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