Second Variation of Energy Functions associated to Families of Canonically Polarized Manifolds
英文摘要：
Let $π:\mathcal{X}\to S$ be a holomorphic family of canonically polarized manifolds over a complex manifold $S$, and $f:\mathcal{X}\to N$ a smooth map into a Riemannian manifold $N$. Consider the energy function $E: S\to \mathbb{R}$ that assigns $z\in S$ to the Dirichlet energy of the map $f|_{\mathcal{X}_z}:\mathcal{X}_z\to N$, where $\mathcal{X}_z=π^{-1}(z)$ is the fiber over $z$. In this article, we compute the second variation formula for the energy function $E$. As a result, we show that if $N$ is of non-positive complexified sectional curvature and every map $f|_{\mathcal{X}_z}:\mathcal{X}_z\to N$ is harmonic, then $E:S\to \mathbb{R}$ is plurisubharmonic.
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