$\bar{\partial}$-Harmonic Maps Between Almost Hermitian Manifolds

TL;DR

This paper introduces a new energy functional for maps between almost Hermitian manifolds, derives its Euler-Lagrange equation, and explores properties and obstructions related to the associated $ar{ ext{ extpartial}}$-harmonic map flow.

Contribution

It defines the $ar{ ext{ extpartial}}$-harmonic map equation, showing its relation to harmonic maps, and establishes existence, obstruction, and bubbling results for the flow.

Findings

Pseudo-holomorphic maps minimize the new energy functional.

Obstructions to long-time existence of the flow are identified.

Finite-time singularities and bubbling phenomena are analyzed.

Abstract

In this paper we study an energy of maps between almost Hermitian manifolds for which pseudo-holomorphic maps are global minimizers. We derive its Euler-Lagrange equation, the $\bar{\partial}$-harmonic map equation, and show that it coincides with the harmonic map equation up to first order terms. We prove results analogous to the those that hold for harmonic maps, including obstructions to the long time existence of the associated parabolic flow, an Eells-Sampson type result under appropriate conditions on the target manifold, and a bubbling result for finite time singularities on surfaces. We also consider examples of the flow where the target is a non-Kahler surface.