On the reducibility of characteristic varieties
Algebraic Geometry
2007-05-23 v3
Abstract
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.
Cite
@article{arxiv.math/9907182,
title = {On the reducibility of characteristic varieties},
author = {Tom Braden},
journal= {arXiv preprint arXiv:math/9907182},
year = {2007}
}
Comments
LaTeX, 7 pages