Calabi flow and projective embeddings

TL;DR

This paper demonstrates that a specific flow on projective embeddings of a variety converges to Calabi flow, linking balanced embeddings with constant scalar curvature metrics, extending Donaldson's foundational work.

Contribution

It establishes the convergence of balancing flow to Calabi flow, providing a parabolic analogue of Donaldson's theorem using advanced asymptotic analysis.

Findings

Balancing flow converges to Calabi flow under certain conditions.

The result extends Donaldson's theorem to a dynamic flow setting.

Asymptotic analysis of the derivative of FS∘Hilb map is crucial.

Abstract

Let X be a smooth subvariety of CP^N. We study a flow, called balancing flow, on the space of projectively equivalent embeddings of X, which attempts to deform the given embedding into a balanced one. If L->X is an ample line bundle, considering embeddings via H^0(L^k) gives a sequence of balancing flows. We prove that, provided these flows are started at appropriate points, they converge to Calabi flow for as long as it exists. This result is the parabolic analogue of Donaldson's theorem relating balanced embeddings to metrics with constant scalar curvature [JDG 59(3):479-522, 2001]. In our proof we combine Donaldson's techniques with an asymptotic result of Liu-Ma [arXiv:math/0601260v2] which, as we explain, describes the asymptotic behaviour of the derivative of the map FS\circ Hilb whose fixed points are balanced metrics.