The non-quasiconvex subgroup conjecture for Cannon–Thurston maps

Let H<GH<G be a hyperbolic subgroup of a hyperbolic group GG. Suppose the Cannon–Thurston map

H,G:HG\partial_{H,G}:\partial_{\infty}H\to\partial_{\infty}G

exists, and suppose that HH is not quasiconvex in GG. Non-quasiconvex subgroup conjecture. There is a continuum of nonconical limit points of HH in GG whose preimages under H,G\partial_{H,G} are not singletons. This conjecture is motivated by the fact that conical limit points have singleton preimages under the Cannon–Thurston map; it predicts that failure of quasiconvexity produces continuum many nonconical limit points with nonsingleton fibers.

Sources & referencesView supporting material

Primary source

Michael Kapovich and Pranab Sardar, “Trees of hyperbolic spaces”, arXiv:2202.09526 (2022).

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