Relative Kahler-Ricci flows and their quantization

TL;DR

This paper explores relative Kahler-Ricci flows on fibered complex manifolds, their preservation of positivity, and their quantization via Donaldson's iteration, with applications to canonical metrics and Weil-Petersson geometry.

Contribution

It introduces a new framework for relative Kahler-Ricci flows, analyzes their properties, and connects them to Donaldson's quantization method, advancing understanding of moduli and canonical metrics.

Findings

Positivity in families is preserved under the flows.

Donaldson's iteration converges to the Kahler-Ricci flow in a double scaling limit.

Applications include constructing canonical metrics and studying Weil-Petersson geometry.

Abstract

Let X be a complex manifold fibered over the base S and let L be a relatively ample line bundle over X. We define relative Kahler-Ricci flows on the space of all Hermitian metrics on L with relatively positive curvature. Mainly three different settings are investigated: the case when the fibers are Calabi-Yau manifolds and the case when L is the relative (anti-) canonical line bundle. The main theme studied is whether posivity in families is preserved under the flows and its relation to the variation of the moduli of the complex structures of the fibres. The quantization of this setting is also studied, where the role of the Kahler-Ricci flow is played by Donaldson's iteration on the space of all Hermitian metrics on the finite rank vector bundle over S defined as the zeroth direct image induced by the fibration. Applications to the construction of canonical metrics on relative canonical bumdles and Weil-Petersson geometry are given. Some of the main results are a parabolic analogue of a recent elliptic equation of Schumacher and the convergence towards the K\"ahler-Ricci flow of Donaldson's iteration in a certain double scaling limit.