Characterization of Hermitian symmetric spaces by fundamental forms

Details Characterization of Hermitian symmetric spaces by fundamental forms Characterization of Hermitian symmetric spaces by fundamental forms

2003-07-09

arxiv.org/abs/math/0307105v1

Mathematics

Differential Geometry

11 pages, to appear in Duke Math. Journal

Scientific paper

We show that an equivariantly embedded Hermitian symmetric space in a projective space, which contains neither a projective space nor a hyperquadric as a component, is characterized by their fundamental forms as a local submanifold of the projective space. Using some invariant-theoretic properties of the fundamental forms and Se-ashi's work on linear differential equations of finite type, we reduce the proof to the vanishing of certain Spencer cohomology groups. The vanishing is checked by Kostant's harmonic theory for Lie algebra cohomology.

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