Translated-subgroup support conjecture for homotopy characteristic varieties

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Let DD be a divisor with isolated non-normal crossings in a sufficiently small ball BϵB_{\epsilon}, and let U=∂Bϵ−DU=\partial B_{\epsilon}-D. The support of the homotopy module πn(U)\pi_n(U) in the character torus Char⁡π1(U)\operatorname{Char}\pi_1(U) is defined by the characters at which its associated homology support is nonzero.

Translated-subgroup support conjecture. The support of πn(∂Bϵ−D)\pi_n(\partial B_{\epsilon}-D) is a union of translated subgroups of Char⁡π1(∂Bϵ−D)\operatorname{Char}\pi_1(\partial B_{\epsilon}-D) by points of finite order.

This generalizes the corresponding assertion for isolated singularities, where the support is given by the torsion eigenvalues of the Milnor monodromy. The paper presents this as a generalization of the monodromy theorem; no resolution status is supplied.

References

Primary source

A. Libgober, “Homotopy groups of complements to ample divisors”, arXiv:math/0404341 (2004).

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