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arxiv: 2606.10443 · v1 · pith:VD5XJC7Qnew · submitted 2026-06-09 · 🧮 math.DG · math-ph· math.MP

Geometry of gravitational instantons

classification 🧮 math.DG math-phmath.MP
keywords gravitationalinstantonsahlerclassificationcompleteconstructioncurvaturedecay
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We survey recent progress in the classification of hyperk\"ahler and Hermitian gravitational instantons (i.e., complete noncompact 4 dimensional Ricci-flat manifolds with quadratic curvature decay), as well as the construction of non-Hermitian gravitational instantons via harmonic maps. We also present a list of open questions related to gravitational instantons.

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