Some applications of canonical metrics to Landau–Ginzburg models

Abstract

It is known that a given smooth del Pezzo surface or Fano threefold $X$ admits a choice of log Calabi–Yau compactified mirror toric Landau–Ginzburg model (with respect to certain fixed Kähler classes and Gorenstein toric degenerations). Here we consider the problem of constructing a corresponding map $\Theta$ from a domain in the complexified Kähler cone of $X$ to a well-defined, separated moduli space $M$ of polarised manifolds endowed with a canonical metric. We prove a complete result for del Pezzos and a partial result for some special Fano threefolds. The construction uses some fundamental results in the theory of constant scalar curvature Kähler metrics. As a consequence $M$ parametrises $K$-stable manifolds and the domain of $\Theta$ is endowed with the pullback of a Weil–Petersson form.