The modified Kodaira conjecture for compact Kähler manifolds

Let XX be a compact Kähler manifold. A compact Kähler space is algebraically approximable if it occurs as the central fibre of a proper flat family having projective fibres along a sequence converging to the central parameter. A bimeromorphic model is a space XX' bimeromorphic to XX.

Modified Kodaira conjecture. There exists a bimeromorphic model

XXX\dashrightarrow X'

where XX' is a normal Q{\mathbb{Q}}-factorial compact Kähler space with terminal singularities and is algebraically approximable.

This modifies Kodaira’s question by allowing singular minimal-model-type bimeromorphic models. Smooth compact Kähler manifolds can fail to have algebraically approximable smooth bimeromorphic models in higher dimensions, while the source reports a partial positive result in dimension three when κ(X)=0\kappa(X)=0.

Sources & referencesView supporting material

Primary source

Andreas Höring and Thomas Peternell, “Bimeromorphic geometry of Kähler threefolds”, arXiv:1701.01653 (2017).

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