Inventiones mathematicae

, Volume 162, Issue 1, pp 19–80

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


DOI: 10.1007/s00222-004-0437-5

Cite this article as:
Fisher, D. & Margulis, G. Invent. math. (2005) 162: 19. doi:10.1007/s00222-004-0437-5


Let Γ be a discrete group with property (T) of Kazhdan. We prove that any Riemannian isometric action of Γ 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 [FM2].

One definition of property (T) is that a group Γ has property (T) if every isometric Γ 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.

Copyright information

© Springer-Verlag 2005

Authors and Affiliations

  1. 1.Department of Mathematics and Computer ScienceLehman College – CUNYBronxUSA
  2. 2.Department of MathematicsYale UniversityNew HavenUSA