Abstract
We consider a simple quiver gauge theory with gauge group U ( r 1 ) × U ( r 2 ) and a Higgs field in the bi-fundamental representation. The background for this theory is a compact Kähler manifold M . For a careful but natural choice of Higgs field potential the second order field equations can be replaced with a set of first order BPS equations. We show that the theory admits two energy gaps: The vacuum is topologically trivial but has finite, non-zero energy and is not a BPS state. The second gap lies between the vacuum and the first BPS state. In this gap we find a ladder of states with non-trivial topology, at equidistant energy levels. We give a semi-explicit construction for such topologically non-trivial non-BPS states.
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