Subgroup dichotomy for cyclically hyperbolic cubulable groups

Let GG be a group acting geometrically on a CAT(0) cube complex. A group is cyclically hyperbolic if it admits a non-elementary acylindrical action on a hyperbolic space with a loxodromic element whose centralizer is virtually cyclic. A group is SQ-universal if every countable group embeds in a quotient of it. Subgroup dichotomy conjecture. If GG is cyclically hyperbolic, then every subgroup of GG is either virtually abelian or SQ-universal.

This is expected to strengthen the paper's subgroup alternative, generalising the corresponding result for GG itself. The conjecture is presented as an expectation, and no resolution is given in the supplied text.

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Primary source

Anthony Genevois, “Cyclic hyperbolicity in CAT(0) cube complexes”, arXiv:2109.07186 (2025).

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