Contraction groups and scales of automorphisms of totally disconnected locally compact groups

Details Contraction groups and scales of automorphisms of totally disconnected locally compact groups Contraction groups and scales of automorphisms of totally disconnected locally compact groups

2003-02-10

arxiv.org/abs/math/0302095v2

Mathematics

Group Theory

revised version, 29 pages, to appear in Israel Journal of Mathematics, please note that document starts on page 2

Scientific paper

We study contraction groups for automorphisms of totally disconnected locally compcat groups using the scale of the automorphism as a tool. The contraction group is shown to be unbounded when the inverse automorphism has non-trivial scale and this scale is shown to be the inverse value of the modular function on the closure of the contraction group at the automorphism. The closure of the contraction group is represented as acting on a homogenous tree and closed contraction groups are characterised.

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