Abstract
We study vortex dynamics in three-dimensional theories with Chern-Simons interactions. The dynamics is governed by motion on the moduli space $\mathcal{M}$ in the presence of a magnetic field. For Abelian vortices, the magnetic field is shown to be the Ricci form over $\mathcal{M}$; for non-Abelian vortices, it is the first Chern character of a suitable index bundle. We derive these results by integrating out massive fermions and following the fate of their zero modes.
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