The weak Whitney theorems for harmonic surfaces

Let MM be the target manifold and let M\operatorname{\mathfrak{M}} denote the moduli space of harmonic surfaces in MM. A harmonic immersion is a harmonic map that is an immersion, and a harmonic embedding is a harmonic map that is an embedding.

Weak Whitney theorems. The space of harmonic immersions in M\operatorname{\mathfrak{M}} is open and dense, and connected if dimM5\dim M\geq 5; moreover, the space of harmonic embeddings in M\operatorname{\mathfrak{M}} is open and dense, and connected if dimM6\dim M\geq 6.

The preceding local results establish these properties near somewhere injective harmonic maps with isolated singularities, while this conjecture asserts them globally without the isolated-singularity hypothesis. It predicts generic immersion and embedding behavior for harmonic surfaces in the indicated target dimensions.

Sources & referencesView supporting material

Primary source

Nathaniel Sagman, “Spaces of harmonic surfaces in non-positive curvature”, arXiv:2111.04142 (2023).

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