The codimension-one-nef formulation of the numerical-dimension conjecture

Let XX be a projective manifold, let CXC\subset X be an irreducible curve with ample normal sheaf, and let LL be an R\mathbb{R}-divisor which is nef in codimension 11.

Codimension-one-nef formulation. If

LC=0,L\cdot C=0,

then

L0.L\equiv 0.

The source presents this as an equivalent formulation of the conjecture that a pseudo-effective line bundle orthogonal to a curve with ample normal sheaf has numerical dimension zero, via divisorial Zariski decomposition. It remains open in general.

Sources & referencesView supporting material

Primary source

Thomas Peternell, “Compact subvarieties with ample normal bundles, algebraicity and cones of cycles”, arXiv:1106.4433 (2011).

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