Deformation along subsheaves, II

Details Deformation along subsheaves, II Deformation along subsheaves, II

2011-03-29

arxiv.org/abs/1103.5630v1

Mathematics

Algebraic Geometry

Scientific paper

Let Y be a compact reduced subspace of a complex manifold X, and let F be a subsheaf of the tangent bundle T_X which is closed under the Lie bracket. This paper discusses criteria to guarantee that infinitesimal deformations of the inclusion morphism Y -> X give rise to positive-dimensional deformation families, deforming the inclusion map "along the sheaf F". In case where X is complex-symplectic and F is the sheaf of Hamiltonian vector fields, this partially reproduces known results on unobstructedness of deformations of Lagrangian submanifolds. Written for the IMPANGA Lecture Notes series, this paper aims at simplicity and clarity of argument. It does not strive to present the shortest proofs or most general results available. The proof is rather elementary and geometric, constructing higher-order liftings of a given infinitesimal deformation using flow maps of carefully crafted time-dependent vector fields.

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