Localization theory of Atiyah classes and its applications

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(1) Concerning the localization theory of Atiyah classes, with collaboration of M. Abate, F. Bracci and F. Tovena, we established the following fundamental theories : (1) a simple definition of Atiyah classes suitable for the localization theory,(2) Cech-Dolbeault cohomology theory,(3) introduction of the complex analytic Thom class,(4) proof of a Bott type vanishing theorem in terms of Atiyah forms.(2) Concerning the degeneracy loci problem of a homomorphism of vector bundles, with collaboration of T. Ohmoto, we started to try to prove the Thom-Porteous formula localized at the degeneracy loci. This is done by constructing a universal localization of a Schur polynomial of Chern. It is a vast generalization of the Thom class of a vector bundle.