Stability of compact actions of the Heisenberg group

Details Stability of compact actions of the Heisenberg group Stability of compact actions of the Heisenberg group

2004-12-27

arxiv.org/abs/math/0412501v2

Mathematics

Geometric Topology

17 pages, no figures (corrected typos and added references)

Scientific paper

Let G be the Heisenberg group of real lower triangular 3x3 matrices with unit diagonal. A locally free smooth action of G on a manifold M^4 is given by linearly independent vector fields X_1, X_2, X_3 such that X_3 = [X_1,X_2] and [X_1,X_3] = [X_2, X_3] = 0. The C^1 topology for vector fields induces a topology in the space of actions of G on M^4. An action is compact if all orbits are compact. Given a compact action $\theta$, we investigate under which conditions its C^1 perturbations $\tilde\theta$ are guaranteed to be compact. There is more than one interesting definition of stability, and we show that in the case of the Heisenberg group, unlike for actions of R^n, the definitions do not turn out to be equivalent.

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