On the reducibility of characteristic varieties

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We present a result which can be used for stratifications with conical singularities to deduce that a perverse sheaf (in particular, an intersection homology sheaf) has reducible characteristic variety, given a hypothesis on the monodromy of the vanishing cycles local system of a stratum. We apply it to explain most of the examples currently known where SS(IC(X)) is reducible for X a Schubert variety in a flag variety.
LaTeX, 7 pages

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Algebraic Geometry, 32S60

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http://salesiana.dossiersoluciones.com/handle/123456789/78890

Consulte el texto completo en el siguiente enlace:

https://arxiv.org/abs/math/9907182
 http://arxiv.org/abs/math/9907182

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arXiv