Toroidal compactification conjecture for elliptic-surface moduli

Let FR\overline{F}^R be the compactification obtained from stable semi-log-canonical pairs (S,ϵR)(\overline S,\epsilon R), let (FR)ν(\overline{F}^R)^\nu denote its normalization, and let D/ΓF\overline{\mathcal D/\Gamma}^{\mathfrak F} be a toroidal compactification of the period-domain quotient for a suitable fan F\mathfrak F.

Toroidal compactification conjecture. There is a morphism

(FR)νD/ΓF(\overline{F}^R)^\nu\to\overline{\mathcal D/\Gamma}^{\mathfrak F}

to some toroidal compactification, for an appropriately chosen fan F\mathfrak F.

The conjecture asks whether the normalization of the KSBA compactification retains enough period information to map to a toroidal compactification. An analogous result is known for elliptic K3 surfaces, but no resolution is supplied here for the elliptic surfaces under consideration.

Sources & referencesView supporting material

Primary source

Philip Engel, François Greer and Abigail Ward, “Periods of elliptic surfaces with p_g=q=1”, arXiv:2308.04563 (2024).

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