Conormal varieties and characteristic varieties

Coutinho, S.; Holland, M.; Levcovitz, D.

doi:10.1090/S0002-9939-99-05137-0

Conormal varieties and characteristic varieties
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by S. C. Coutinho, M. P. Holland and D. Levcovitz PDF

Proc. Amer. Math. Soc. 128 (2000), 975-980 Request permission

Abstract:

We show that the conormal variety of a quasihomogeneous hypersurface in ${\mathbb {C}}^{n}$, for $n\ge 4$, whose link is a $\mathbb {Q}$-homology sphere is not the characteristic variety of any ${\mathcal {D}}$-module.

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