The Weyl-monodromy realization conjecture for D and E singularities

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Let WW be the Weyl group associated with a singularity of type DnD_n or EnE_n. For some proper smooth surface X/KX/K, consider an integral model of XX whose special fiber has a singularity of the specified type, and let the monodromy operator act on the relevant cohomology. Weyl-monodromy realization conjecture. One may construct an integral model of some proper smooth surface X/KX/K such that the monodromy operator lies in any conjugacy class of WW. This is presented as a conjectural statement and is described as work in progress; the claimed realization of all Weyl-group conjugacy classes is not established in the source.

References

Primary source

Jason Kountouridis, “On simple singularities and Weyl monodromy actions in mixed characteristic”, arXiv:2312.09175 (2023).

Additional references

2 papers in this index state this conjecture (2015–2023). The statement above is taken from the most recent of them; the others are arXiv:1501.00226.

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