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A combination theorem for special cube complexes
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DOI：10.4007/annals.2012.176.3.2.png)
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We prove that certain compact cube complexes have special finite covers. This means they have finite covers whose fundamental groups are quasiconvex sub-groups of right-angled Artin groups. As a result we obtain, linearity and the separability of quasiconvex subgroups, for the groups we consider. Our result applies in particular to compact negatively curved cube complexes whose hyperplanes don't self-intersect. For cube complexes with word-hyperbolic fundamental group, we are able to show that they are virtually special if and only if the hyperplanes are separable. In a final application, we show that the fundamental groups of every simple type uniform arithmetic hyperbolic manifolds are cubical and virtually special.
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SUBGROUPS
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IF:
5.3
论文数:
1.4K
被引数:
1.6W
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