Deformation conjecture for semi-log canonical foliation singularities

From papers

Let f ⁣:(X,F)Tf\colon (X, \mathcal F) \rightarrow T be a flat family of integrable distributions such that KFK_{\mathcal F} is Q\mathbb Q-Cartier and the fibres of ff are deminormal. Suppose that Ft\mathcal F_t is semi-log canonical for some closed point tTt \in T. Then there exists a Zariski open subset tUTt \in U \subset T such that for all sUs \in U, Fs\mathcal F_{s} is semi-log canonical.

Semi-log canonical singularities deform. Under these hypotheses, semi-log canonical singularities of the fibre at tt persist for all fibres over some Zariski-open neighbourhood UU of tt.

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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