Composite non-Abelian strings with Grassmannian models on the worldsheet by Edwin Ireson, Mikhail Shifman, Alexei Yung

“…The generalization is straightforward and provides, among other results, a simple and transparent way for counting the number of vacua in N=(2,2) Grassmannian model.…”
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General composite non-Abelian strings and flag manifold sigma models by Edwin Ireson

“…After spontaneous symmetry breaking, there remains some internal color degrees of freedom attached to these objects, which we argue must exist in a flag manifold, a more general kind of projective space than both CP(N) and the Grassmannian manifold. These strings are expected to be Bogomol'nyi-Prasad-Sommerfeld since its constituents are. …”
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