Demailly's Hodge conjecture for strongly positive currents

Let XX be a complex variety, and let T\mathscr{T} be a (p,p)(p,p)-dimensional strongly positive closed current on XX whose cohomology class satisfies

{T}RZ(H2q(X,Z)/torsHq,q(X)).\{\mathscr{T}\} \in \mathbb{R} \otimes_{\mathbb{Z}} \big(H^{2q}(X,\mathbb{Z})/\operatorname{tors} \cap H^{q,q}(X)\big).

Demailly's Hodge conjecture for strongly positive currents. The current T\mathscr{T} is a weak limit

T=limiTi,Ti=jλij[Zij],\mathscr{T}=\lim_{i \to \infty} \mathscr{T}_i, \qquad \mathscr{T}_i=\sum_j \lambda_{ij}[Z_{ij}],

where each λij\lambda_{ij} is a positive real number and each ZijZ_{ij} is a pp-dimensional subvariety of XX. This conjecture was introduced by Demailly as a Hodge-type conjecture for positive currents, but the paper states that it is now disproven and presents counterexamples in every dimension and codimension greater than 11.

Sources & referencesView supporting material

Primary source

Karim Adiprasito and Farhad Babaee, “Convexity of complements of tropical varieties, and approximations of currents”, arXiv:1711.02045 (2018).

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