Deformation conjecture for semi-log canonical foliation singularities
Deformation conjecture for semi-log canonical foliation singularities
Let be a flat family of integrable distributions such that is -Cartier and the fibres of are deminormal. Suppose that is semi-log canonical for some closed point . Then there exists a Zariski open subset such that for all , is semi-log canonical.
Semi-log canonical singularities deform. Under these hypotheses, semi-log canonical singularities of the fibre at persist for all fibres over some Zariski-open neighbourhood of .
This conjecture concerns the openness of semi-log canonical singularities in families of foliations and is presented as a central problem in constructing moduli spaces. The analogous assertion for canonical singularities is false, but the semi-log canonical version is left open.
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Sources & referencesView supporting material
Primary source
Calum Spicer, Roberto Svaldi and Sebastian Velazquez, “On moduli of foliated surfaces”, arXiv:2511.13491 (2025).
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