Almost isometric actions, property $(T)$, and local rigidity

Details Almost isometric actions, property $(T)$, and local rigidity Almost isometric actions, property $(T)$, and local rigidity

2003-12-19

arxiv.org/abs/math/0312386v3

Mathematics

Dynamical Systems

69 pages. See also http://comet.lehman.cuny.edu/fisher/ Substantial revision including reordering of many arguments and stream

Scientific paper

Let $\Gamma$ be a discrete group with property $(T)$ of Kazhdan. We prove that any Riemannian isometric action of $\Gamma$ on a compact manifold $X$ is locally rigid. We also prove a more general foliated version of this result. The foliated result is used in our proof of local rigidity for standard actions of higher rank semisimple Lie groups and their lattices in \cite{FM2}. One definition of property $(T)$ is that a group $\Gamma$ has property $(T)$ if every isometric $\Gamma$ action on a Hilbert space has a fixed point. We prove a variety of strengthenings of this fixed point properties for groups with property $(T)$. Some of these are used in the proofs of our local rigidity theorems.

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