The virtually Kleinian conjecture for relatively hyperbolic groups with planar boundary

Let GG be a one-ended group and let (G,P)(G,\mathcal{P}) be a relatively hyperbolic pair, with Bowditch boundary (G,P)\partial(G,\mathcal{P}). Assume that this boundary is planar and has no cut points. Virtually Kleinian conjecture. Then GG is virtually a Kleinian group. This conjecture extends the Cannon conjecture. It is known in the case where the boundary is a 22-sphere, giving the Relative Cannon Conjecture, and is also known in a key hyperbolic case without Sierpiński carpets and with no 22-torsion. The Sierpiński carpet case is attributed to Kapovich and Kleiner; examples show that the virtual qualifier is necessary in general.

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Primary source

G. Christopher Hruska and Genevieve S. Walsh, “Planar boundaries and parabolic subgroups”, arXiv:2008.07639 (2022).

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