Divergence of geodesics in Teichmuller space and the mapping class group

Details Divergence of geodesics in Teichmuller space and the mapping class group Divergence of geodesics in Teichmuller space and the mapping class group

2006-11-12

arxiv.org/abs/math/0611359v3

GAFA, Volume 19, Issue 3 (2009), 722--742

Mathematics

Geometric Topology

21 pages

Scientific paper

We show that both Teichmuller space (with the Teichmuller metric) and the mapping class group (with a word metric) have geodesic divergence that is intermediate between the linear rate of flat spaces and the exponential rate of hyperbolic spaces. For every two geodesic rays in Teichmuller space, we find that their divergence is at most quadratic. Furthermore, this estimate is shown to be sharp via examples of pairs of rays with exactly quadratic divergence. The same statements are true for geodesic rays in the mapping class group. We explicitly describe efficient paths "near infinity" in both spaces.

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