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arXiv · 2609.39961

Non-Hermitian Yang--Mills Connections with Vanishing Chern Classes

Guangzhen Ren
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Abstract

We construct non-flat non-Hermitian Yang--Mills connections with zero Einstein constant on smoothly trivial rank-two bundles over compact Kähler surfaces, with positive harmonic metrics and stable induced and adjoint holomorphic bundles. Thus vanishing Chern classes do not force flatness even under stability on both sides. The local model comes from a known complex anti-self-dual ansatz; the stable descents yield explicit global moduli phenomena. For a fixed stable bundle, the Kaledin--Verbitsky map contracts a complex line containing flat and non-flat points in the connected component of the Hermitian--Einstein connection. Contraction also occurs in the two-sided stable locus. The pair of holomorphic projections has a fibre containing both flat and non-flat points. An energy identity and a spectral-gap estimate quantify local flatness with the induced holomorphic structure fixed.

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Guangzhen Ren. 2026-09-30. Non-Hermitian Yang--Mills Connections with Vanishing Chern Classes. https://arxiv.org/abs/2609.39961

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