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arXiv 1610.08005math.GR
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Out($W_n$)的酰基双曲性

Acylindrical Hyperbolicity of Out($W_n$)

Brendan Burns Healy

摘要:

证明了自由Coxeter群$W_n$的外自同构群在Osin意义下是非圆柱双曲的.作为应用,我们观察到任何CAT(0)空间允许几何作用Out($W_n$)必须包含一个秩1测地线。该定理从扩展Out($W_n$)和自由群的外自同构群之间的一个众所周知的关系出发。

英文摘要:

We prove that the group of outer automorphisms of the free Coxeter group $W_n$ is acylindrically hyperbolic in the sense of Osin. As an application, we observe that any CAT(0) space admitting a geometric action by Out($W_n$) must contain a rank-one geodesic. The theorem proceeds from expanding on a well-known relationship between Out($W_n$) and the outer automorphism group of free groups.

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