Journal title
Proc. Lond. Math. Soc.
DOI
10.1112/plms/pdq025
Issue
3
Volume
102
Last updated
2023-12-17T15:02:03.727+00:00
Page
503-554
Abstract
The main goal of this paper is a detailed study of asymptotic cones of the
mapping class groups. In particular, we prove that every asymptotic cone of a
mapping class group has a bi-Lipschitz equivariant embedding into a product of
real trees, sending limits of hierarchy paths onto geodesics, and with image a
median subspace. One of the applications is that a group with Kazhdan's
property (T) can have only finitely many pairwise non-conjugate homomorphisms
into a mapping class group. We also give a new proof of the rank conjecture of
Brock and Farb (previously proved by Behrstock and Minsky, and independently by
Hamenstaedt).
mapping class groups. In particular, we prove that every asymptotic cone of a
mapping class group has a bi-Lipschitz equivariant embedding into a product of
real trees, sending limits of hierarchy paths onto geodesics, and with image a
median subspace. One of the applications is that a group with Kazhdan's
property (T) can have only finitely many pairwise non-conjugate homomorphisms
into a mapping class group. We also give a new proof of the rank conjecture of
Brock and Farb (previously proved by Behrstock and Minsky, and independently by
Hamenstaedt).
Symplectic ID
127297
Download URL
http://arxiv.org/abs/0810.5376v4
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Publication type
Journal Article
Publication date
29 Oct 2008