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Yang-Mills-Higgs connections on Calabi-Yau manifolds, II (1606.09353v3)

Published 30 Jun 2016 in math.AG and math.CV

Abstract: In this paper we study Higgs and co-Higgs $G$-bundles on compact K\"ahler manifolds $X$. Our main results are: (1) If $X$ is Calabi-Yau, and $(E,\,\theta)$ is a semistable Higgs or co-Higgs $G$-bundle on $X$, then the principal $G$-bundle $E$ is semistable. In particular, there is a deformation retract of ${\mathcal M}_H(G)$ onto $\mathcal M(G)$, where $\mathcal M(G)$ is the moduli space of semistable principal $G$-bundles with vanishing rational Chern classes on $X$, and analogously, ${\mathcal M}_H(G)$ is the moduli space of semistable principal Higgs $G$-bundles with vanishing rational Chern classes. (2) Calabi-Yau manifolds are characterized as those compact K\"ahler manifolds whose tangent bundle is semistable for every K\"ahler class, and have the following property: if $(E,\,\theta)$ is a semistable Higgs or co-Higgs vector bundle, then $E$ is semistable.

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