Mathematics – Geometric Topology
Scientific paper
2008-04-28
Mathematics
Geometric Topology
11 pages, major revisions. To appear in Duke Math Jour
Scientific paper
Royden proved that any isometry of Teichmuller space in the Teichmuller metric must be an element of the extended mapping class group M(S). He also proved that the Teichmuller metric is not symmetric at any point. In this paper we give extensions of Royden's theorems from the Teichmuller metric to an arbitrary complete, finite covolume, M(S)-invariant Finsler (e.g. Riemannian) metric on Teichmuller space. In particular this gives a new mechanism behind Royden's original theorem.
Farb Benson
Weinberger Shmuel
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