Abstract
We study the Hamiltonian structure of the gauge symmetry breaking and enhancement. After giving a general discussion of these phenomena in terms of the constrained phase space, we perform a canonical analysis of the Grassmannian nonlinear sigma model coupled with Chern-Simons term, which contains a free parameter governing explicit symmetry enhancement⇋ breaking according to U(n + m) ⇋ U(n) × U(m).
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