Global rigidity of solvable group actions on S^1

Details Global rigidity of solvable group actions on S^1 Global rigidity of solvable group actions on S^1

2003-10-31

arxiv.org/abs/math/0310498v2

Geom. Topol. 8(2004) 877-924

Mathematics

Dynamical Systems

Published by Geometry and Topology at http://www.maths.warwick.ac.uk/gt/GTVol8/paper23.abs.html

Scientific paper

In this paper we find all solvable subgroups of Diff^omega(S^1) and classify their actions. We also investigate the C^r local rigidity of actions of the solvable Baumslag-Solitar groups on the circle. The investigation leads to two novel phenomena in the study of infinite group actions on compact manifolds. We exhibit a finitely generated group Gamma and a manifold M such that: * Gamma has exactly countably infinitely many effective real-analytic actions on M, up to conjugacy in Diff^omega(M); * every effective, real analytic action of Gamma on M is C^r locally rigid, for some r>=3, and for every such r, there are infinitely many nonconjugate, effective real-analytic actions of Gamma on M that are C^r locally rigid, but not C^(r-1) locally rigid.

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