Lojasiewicz inequalities for almost harmonic maps near simple bubble trees

TL;DR

This paper establishes Lojasiewicz inequalities for harmonic maps near simple bubble trees, leading to new insights on flow convergence and energy spectra, applicable to general targets and non-integrable cases.

Contribution

It extends Lojasiewicz inequalities to the singular setting of bubble trees, improving understanding of harmonic map flow and energy spectra in broader contexts.

Findings

Proves Lojasiewicz inequalities near bubble trees

Derives convergence results for harmonic map flow

Analyzes energy spectrum of small-energy harmonic maps

Abstract

We prove Lojasiewicz inequalities for the harmonic map energy for maps from surfaces of positive genus into general analytic target manifolds which are close to simple bubble trees and as a consequence obtain new results on the convergence of harmonic map flow and on the energy spectrum of harmonic maps with small energy. Our results and techniques are not restricted to particular targets or to integrable settings and we are able to lift general Lojasiewicz-Simon inequalities valid near harmonic maps $\hat \omega:S^2\to N$ to the singular setting whenever the bubble $\hat \omega$ is attached at a point which is not a branch point.