On symmetric Cauchy-Riemann manifolds

Details On symmetric Cauchy-Riemann manifolds On symmetric Cauchy-Riemann manifolds

1999-05-29

arxiv.org/abs/math/9905183v1

Mathematics

Complex Variables

24 pages, to appear in Advances in Mathematics

Scientific paper

A joint generalization of real smooth as well of complex manifolds are the Cauchy-Riemann manifolds. The main objective of the paper is to inroduce a class of symmetric CR manifolds containing both classes of Riemannian and Hermitian symmetric spaces. It turns out that the classical requirement of isolated fixed points for the symmetries is no longer adequate, because it would imply the Levi-flatness. Among all symmetric CR-manifolds we distinguish a large subclass consisting of all Shilov boundaries of bounded symmetric domains. For this class we calculate the polynomial and the rational convex hulls Both hulls are canonically stratified into real-analytic CR-submanifolds such that the (unique) stratum of the highest dimension is complex for the polynomial and Levi-flat for the rational convex hull. It is also proved that the CR-functions extend continuously to the rational convex hull such that the extension is CR on every stratum.

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