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Localizing Virtual Cycles by Cosections

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arxiv 1007.3085 v2 pith:H4XDNLRQ submitted 2010-07-19 math.AG

Localizing Virtual Cycles by Cosections

classification math.AG
keywords virtualconstructionscosectioncycleslocalizedobstructionalgebraicapplications
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We show that a cosection of the obstruction sheaf of a perfect obstruction theory localizes the virtual cycle to the non-surjective locus of the cosection. We give algebraic constructions of localized Gysin maps and localized virtual cycles. Various applications of these constructions are discussed.

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