On rigidity of Grauert tubes over homogeneous Riemannian manifolds

Details On rigidity of Grauert tubes over homogeneous Riemannian manifolds On rigidity of Grauert tubes over homogeneous Riemannian manifolds

2003-10-06

arxiv.org/abs/math/0310069v2

Mathematics

Complex Variables

23 pages. J.reine angew. Math. (to appear)

Scientific paper

Given a real-analytic Riemannian manifold $X$ there is a canonical complex structure, which is compatible with the canonical complex structure on $T^*X$ and makes the leaves of the Riemannian foliation on $TX$ into holomorphic curves, on its tangent bundle. A {\it Grauert tube} over $X$ of radius $r$, denoted as $T^rX$, is the collection of tangent vectors of $X$ of length less than $r$ equipped with this canonical complex structure. In this article, we prove the following two rigidity property of Grauert tubes. First, for any real-analytic Riemannian manifold such that $r_{max}>0$, we show that the identity component of the automorphism group of $T^rX$ is isomorphic to the identity component of the isometry group of $X$ provided that $r

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