Proves κ(F) ≥ √(2n/(n+1)) for almost Hermitian (dim 2n) or quaternion-Hermitian (dim 4n) submanifolds with harmonic fundamental forms, with equality iff the form is parallel and the immersion is a standard Veronese embedding up to totally geodesic inclusion.
Gromov,Isometric immersions with controlled curvatures, arXiv:2212.06122, 2022.↑2
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Maximal Normal Curvature and Veronese Rigidity
Proves κ(F) ≥ √(2n/(n+1)) for almost Hermitian (dim 2n) or quaternion-Hermitian (dim 4n) submanifolds with harmonic fundamental forms, with equality iff the form is parallel and the immersion is a standard Veronese embedding up to totally geodesic inclusion.