The abundance conjecture for exterior powers of the cotangent bundle

Let XX be a smooth compact Kähler manifold and let ΩXp\Omega_X^p be its sheaf of holomorphic pp-forms. For a torsion-free coherent sheaf E\mathcal E on XX, define its Kodaira and numerical dimensions by

κ(E)=κ(P(E),OE(1))(rankE1),\kappa(\mathcal E)=\kappa(\mathbb P(\mathcal E),\mathcal O_{\mathcal E}(1))-(\operatorname{rank}\mathcal E-1), ν(E)=ν(P(E),OE(1))(rankE1).\nu(\mathcal E)=\nu(\mathbb P(\mathcal E),\mathcal O_{\mathcal E}(1))-(\operatorname{rank}\mathcal E-1). νp(X):=ν(ΩXp),κp(X):=κ(ΩXp).\nu_p(X):=\nu(\Omega_X^p),\qquad \kappa_p(X):=\kappa(\Omega_X^p).

Generalized abundance conjecture. For every XX and every integer p>0p>0,

νp(X)=κp(X).\nu_p(X)=\kappa_p(X).

This extends the classical abundance conjecture from the canonical bundle to the cotangent sheaves. The source notes results when κp(X)=\kappa_p(X)=-\infty and for elliptic surfaces, but gives no general resolution.

Sources & referencesView supporting material

Primary source

Frederic Campana, “Algebraicity of foliations on complex projective manifolds, applications”, arXiv:2112.12448 (2021).

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