The disjoint curves conjecture for Kähler manifolds and orbifolds

Let XX be a Kähler manifold or a Kähler orbifold with first Betti number b1=0b_1=0 and second Betti number b22b_2\geq 2. Suppose that XX contains disjoint complex curves spanning H2(X,Q)H_2(X,\mathbb{Q}), all of the same genus g1g\geq 1. Disjoint curves conjecture. There does not exist such an XX. This conjecture constrains the topology of Kähler manifolds and orbifolds containing disjoint complex curves that span their second homology. The cited result gives a bound in a related setting, but the nonexistence statement itself remains open here.

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Primary source

Alejandro Cañas, Vicente Muñoz, Juan Rojo and Antonio Viruel, “A K-contact simply connected 5-manifold with no semi-regular Sasakian structure”, arXiv:1911.08901 (2020).

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