Generic nefness conjecture for the cotangent and tangent bundles

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Let XX be a compact Kähler manifold, and let α1,…,αn−1\alpha_1,\ldots,\alpha_{n-1} be Kähler classes. For a coherent sheaf, generically nef means generically nef with respect to the indicated product of Kähler classes. Generic nefness conjecture. (1) If KXK_X is nef, then ΩX\Omega_X is α1⋯αn−1\alpha_1\cdots\alpha_{n-1}-generically nef. (2) If −KX-K_X is nef, then TXT_X is α1⋯αn−1\alpha_1\cdots\alpha_{n-1}-generically nef. The conjecture is affirmatively solved in the projective case, but remains open for compact Kähler manifolds; the source attributes the difficulty to the lack of the required foliation theory in that setting.

References

Primary source

Masataka Iwai and Shin-ichi Matsumura, “Abundance theorem for minimal compact Kähler manifolds with vanishing second Chern class”, arXiv:2205.10613 (2022).

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