Yau's projectivity and rational connectedness conjecture for positively curved Kähler manifolds

Let MM be a compact complex manifold admitting a Kähler metric ω\omega with positive holomorphic sectional curvature. The holomorphic sectional curvature along a nonzero VT1,0MV\in T^{1,0}M is

H(V)=R(V,V,V,V)Vω4,H(V)=\frac{R(V,\overline{V},V,\overline{V})}{\lvert V\rvert_{\omega}^4},

where RR is the Riemannian curvature tensor of ω\omega. Yau's conjecture. If MM admits such a metric, then MM is projective and rationally connected. This conjecture gives a geometric characterization of rational connectedness in terms of positive holomorphic sectional curvature. The supplied text does not state whether it has been resolved.

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Primary source

Shiyu Zhang and Xi Zhang, “On the structure of compact Kähler manifolds with nonnegative holomorphic sectional curvature”, arXiv:2311.18779 (2024).

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