Yang-Mills heat flow on gauged holomorphic maps

Details Yang-Mills heat flow on gauged holomorphic maps Yang-Mills heat flow on gauged holomorphic maps

2012-01-09

arxiv.org/abs/1201.1933v1

Mathematics

Differential Geometry

53 pages

Scientific paper

We study the gradient flow lines of a Yang-Mills-type functional on the space of gauged holomorphic maps $\mathcal{H}(P,X)$, where $P$ is a principal bundle on a Riemann surface $\Sigma$ and $X$ is a Kahler Hamiltonian $G$-manifold. For compact $\Sigma$, possibly with boundary, we prove long time existence of the gradient flow. The flow lines converge to critical points of the functional. So, there is a stratification on $\mathcal{H}(P,X)$ that is invariant under the action of the complexified gauge group. Symplectic vortices are the zeros of the functional we study. When $\Sigma$ has boundary, similar to Donaldson's result for the Hermitian Yang-Mills equations, we show that there is only a single stratum - any element of $\mathcal{H}(P,X)$ can be complex gauge transformed to a symplectic vortex. This is a version of Mundet's Hitchin-Kobayashi result on a surface with boundary.

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