When does a one-relator group have a quasi-convex hierarchy?

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• Marco Linton (University of Warwick)
• Friday 05 November 2021, 13:45-14:45
• In person if possible.

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Within the class of one-relator groups, those with torsion are better understood: they are hyperbolic, their Magnus subgroups are quasi-convex and so they (virtually) have quasi-convex hierarchies. However, many torsion-free two-generator one-relator groups exhibit pathological behaviours. Recently, Louder and Wilton have shown that one-relator groups with negative immersions do not contain two-generator one-relator subgroups, leading them to conjecture that such groups are hyperbolic. In this talk, I will show how to refine the classical Magnus—Moldavanskii hierarchy for a one-relator group. I will show that a one-relator hierarchy without Baumslag—Solitar subgroups is a hyperbolic quasi-convex hierarchy if it satisfies an additional technical hypothesis. I will then relate this with the conjecture of Louder and Wilton and show how it can be converted to a question about free groups.

This talk is part of the Geometric Group Theory (GGT) Seminar series.

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