On rigidity of Grauert tubes

Details On rigidity of Grauert tubes On rigidity of Grauert tubes

2003-10-08

arxiv.org/abs/math/0310119v1

Mathematics

Complex Variables

14 pages, submitted

Scientific paper

Given a real-analytic Riemannian manifold M there exists a canonical complex structure on part of its tangent bundle which turns leaves of the Riemannian foliation on TM into holomorphic curves. A Grauert tube over M of radius r, denoted as T^rM, is the collection of tangent vectors of M of length less than r equipped with this canonical complex structure. We say the Grauert tube T^rM is rigid if Aut(T^rM) is coming from Isom (M). In this article, we prove the rigidity for Grauert tubes over quasi-homogeneous Riemannian manifolds. A Riemannian manifold (M,g) is quasi-homogeneous if the quotient space M/Isom_0 (M) is compact. This category has included compact Riemannian manifolds, homogeneous Riemannian manifolds, co-compact Riemannian manifolds whose isometry groups have dimensions >0, and products of the above spaces.

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