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Contracting orbits in Outer space
被引:2
作者:
Dowdall, Spencer
[1
]
Taylor, Samuel J.
[2
]
机构:
[1] Vanderbilt Univ, Dept Math, 1326 Stevenson Ctr, Nashville, TN 37240 USA
[2] Temple Univ, Dept Math, 1805 North Broad St, Philadelphia, PA 19122 USA
基金:
美国国家科学基金会;
关键词:
COMPLEX;
BOUNDARY;
D O I:
10.1007/s00209-019-02227-7
中图分类号:
O1 [数学];
学科分类号:
0701 ;
070101 ;
摘要:
We show that strongly contracting geodesics in Outer space project to parameterized quasigeodesics in the free factor complex. This result provides a converse to a theorem of Bestvina-Feighn, and is used to give conditions for when a subgroup of Out(F) has a quasi-isometric orbit map into the free factor complex. It also allows one to construct many new examples of strongly contracting geodesics in Outer space.
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页码:767 / 787
页数:21
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