Preprintpro-\(p\) completions of \(PD_n\)-groupsJ.A.Hillman and D.H.KochloukovaAbstractWe sharpen earlier work on the pro-\(p\) completions of orientable \(PD_3\)-groups. There are four cases, and we give examples of aspherical 3-manifolds representing each case. In three of the four cases the new results are best possible. We also consider the pro-\(p\) completion of some orientable \(PD_n\) groups for \(n \leq 5\), including surface-by-surface groups. Keywords: pro-\(p\) completion, \(PD_3\)-group, \(PD_n\)-group, surface bundle.AMS Subject Classification: Primary 20Jxx.
This paper is available as a pdf (220kB) file. It is also on the arXiv: arxiv.org/abs/2205.06155.
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