Gromov-Hausdorff Convergence of Constant Scalar Curvature Kähler Metrics near the Canonical Class

Abstract

Let $X$ be a compact Kähler manifold with semi-ample canonical bundle. For any Kähler class $[\omega ]$, Jian--Shi--Song proved that there exists a unique cscK metric in the class $2\pi c_1(K_X)+\epsilon [\omega ]$ when $\epsilon \in (0,{\epsilon }_0]$, using the properness criterion of Chen--Cheng. We prove that the cscK metrics in $2\pi c_1(K_X)+\epsilon [\omega ]$ converge, as $\epsilon \downarrow 0$, in the Gromov--Hausdorff topology to the metric completion of the twisted Kähler-Einstein metric on the canonical model of $X$ as conjectured by Jian--Shi--Song. Based on the technique developed in this paper, we can also give a new proof the theorem of Lee--Tosatti--Zhang on the Gromov-Hausdorff convergence of the normalized Kähler--Ricci flow on $X$.

arXiv comment41 pages; comments are welcome