The TnT_n conjecture on compact Kähler manifolds with generically large fundamental group

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Let XX be a compact Kähler manifold of dimension nn with generically large fundamental group, meaning that the fundamental-group image of every subvariety through a very general point is infinite. Suppose that either

there exists a proper modification C~k→Ck and a surjective map C~k→X~,\text{there exists a proper modification }\widetilde{\mathbb{C}}^k\to\mathbb{C}^k\text{ and a surjective map }\widetilde{\mathbb{C}}^k\to\widetilde X,

or κ(X)≤0\kappa(X)\leq 0, where X~\widetilde X is the universal covering. The TnT_n conjecture. There exists a finite étale cover X′→XX'\to X such that X′X' is bimeromorphic to a torus.

This is presented as a reduction step toward Iitaka's conjecture for non-algebraic compact Kähler manifolds that are not simple. Its general validity is not established in the source.

References

Primary source

Andreas Höring, Thomas Peternell and Ivo Radloff, “Uniformisation in dimension four: towards a conjecture of Iitaka”, arXiv:1103.5392 (2017).

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