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Alekseevsky–Marchiafava–Pontecorvo conjecture for hyper-Hermitian quaternionic Kähler manifolds
Alekseevsky–Marchiafava–Pontecorvo conjecture. The only complete simply connected hHqK manifold with negative scalar curvature is $\mathbb{H}H^n$ .
Conjectureopendifferential-geometry quaternionic-geometry quaternionic-kahler-manifoldsarXiv posted 2 days ago

Alekseevsky–Marchiafava–Pontecorvo conjecture for hyper-Hermitian quaternionic Kähler manifolds