Arakelov Type Inequalities and Deformation Boundedness of polarized varieties

TL;DR

This paper extends Arakelov inequalities to higher dimensions, proving hyperbolicity and boundedness results for families of polarized varieties, advancing understanding of geometric structures and moduli spaces.

Contribution

It introduces higher-dimensional generalizations of Arakelov inequalities and establishes hyperbolicity and deformation boundedness for families of polarized varieties.

Findings

Proves hyperbolicity of the base of certain families using Hodge theory.

Establishes deformation boundedness of lc stable minimal models.

Provides new inequalities generalizing Arakelov's classical results.

Abstract

We give two kinds of generalizations of Arakelov type inequalities for higher dimensional families. These results give higher dimensional generalizations (in both fibers and bases) of the weakly boundedness in Par\v{s}in-Arakelov's reformulation of the geometric Shafarevich conjecture. As a consequence, we deduce the following results. Hyperbolicity: We give an alternative proof (using the theory of degeneration of Hodge structure) to the hyperbolicity (in Par\v{s}in-Arakelov's reformulation, i.e. Viehweg's hyperbolicity conjecture) of the base of a family with maximal variation whose general fibers admit good minimal models. This has been proved by Popa-Schnell Hodge theoretically. Boundedness: We show the deformation boundedness of admissible families of lc stable minimal models (introduced by Birkar) with an arbitrary Kodaira dimension.