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arXiv · 2609.25893

Harmonic Map Heat Flow Coupled to a Green-Potential

Zhe Zhang
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Abstract

We introduce a Green--potential heat flow for maps from a closed Riemannian surface. Inspired by Parker--Wolfson renormalization~\cite{ParkerWolfson1993,Parker1996}, the conformal factor is reconstructed at each time from an energy-based source determined by the current map. The resulting parabolic--elliptic system incorporates renormalization into the evolution while leaving the Dirichlet energy functional and its harmonic critical points unchanged. We establish local well-posedness for $H^3$ initial data and a continuation criterion in terms of energy concentration. For sufficiently large coupling, we exclude finite-time bubbling and obtain global solutions. At infinite time, the energy identity provides only weighted $L^2$ control of the tension field. Localizing to regular regions of concentration charts yields harmonic profiles along subsequences of prescribed times. We represent these profiles in the flow's packet charts, organize them into a finite bubble tree, and decompose the limiting energy into harmonic component energies and neck energies. A critically normalized radial example illustrates how the modified flow can prevent finite-time blow-up and produce harmonic bubbles with no-neck property.

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Zhe Zhang. 2026-09-22. Harmonic Map Heat Flow Coupled to a Green-Potential. https://arxiv.org/abs/2609.25893

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