Unobstructedness of deformations of holomorphic maps onto Fano manifolds of Picard number 1
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Jun-Muk Hwang
Abstract
We show that deformations of a surjective morphism onto a Fano manifold of Picard number 1 are unobstructed and rigid modulo the automorphisms of the target, if the variety of minimal rational tangents of the Fano manifold is non-linear or finite. The condition on the variety of minimal rational tangents holds for practically all known examples of Fano manifolds of Picard number 1, except the projective space. When the variety of minimal rational tangents is non-linear, the proof is based on an earlier result of N. Mok and the author on the birationality of the tangent map. When the varieties of minimal rational tangents of the Fano manifold is finite, the key idea is to factorize the given surjective morphism, after some transformation, through a universal morphism associated to the minimal rational curves.
© Walter de Gruyter Berlin · New York 2009
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- A short proof of the λg-conjecture without Gromov-Witten theory: Hurwitz theory and the moduli of curves
- Unobstructedness of deformations of holomorphic maps onto Fano manifolds of Picard number 1
- Cayley decompositions of lattice polytopes and upper bounds for h*-polynomials
- Siegel's trace problem and character values of finite groups
Articles in the same Issue
- Trees and mapping class groups
- The Hartogs extension theorem on (n – 1)-complete complex spaces
- On Hartogs' extension theorem on (n – 1)-complete complex spaces
- Cohomological finiteness conditions for elementary amenable groups
- The behaviour of the differential Galois group on the generic and special fibres: A Tannakian approach
- Discrete holomorphic geometry I. Darboux transformations and spectral curves
- Multilinear morphisms between 1-motives
- A short proof of the λg-conjecture without Gromov-Witten theory: Hurwitz theory and the moduli of curves
- Unobstructedness of deformations of holomorphic maps onto Fano manifolds of Picard number 1
- Cayley decompositions of lattice polytopes and upper bounds for h*-polynomials
- Siegel's trace problem and character values of finite groups
