Odaka's product behavior conjecture for minimally non-collapsing limits

Let (X,L)Δ(\mathcal X^*,\mathcal L^*)\to\Delta^* be a degeneration satisfying the paper's special maximal-degeneration expectation, and let (S,M)(S,M) be a fixed pointed polarized mm-dimensional Calabi–Yau variety with point ss'. Consider the product degeneration with fibers Xt×S\mathcal X_t\times S and polarization p1Lp2Mp_1^*\mathcal L\otimes p_2^*M. Product behavior conjecture for minimally non-collapsing limits. The minimal non-collapsing limit of the fiber Ricci-flat Kähler metrics is isometric to the metric product of the minimal non-collapsing pointed Gromov–Hausdorff limit of Xt\mathcal X_t at s(t)s(t) and the metric tangent cone of SS at ss'. This expectation is proposed as a counterexample to extending the preceding special-degeneration expectation to general products, and is said to be easily verified for degenerating polarized abelian varieties; the source gives no resolution.

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Primary source

Yuji Odaka, “Polystable log Calabi-Yau varieties and Gravitational instantons”, arXiv:2009.13876 (2020).

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