A non-quasiconvex embedding of relatively hyperbolic groups

preprint2012arXivOpen access

Abstract

For any finitely generated, non-elementary, torsion-free group GG that is hyperbolic relative to P\mathbb P, we show that there exists a group G∗G^* containing GG such that G∗G^* is hyperbolic relative to P\mathbb P and GG is not relatively quasiconvex in G∗G^*. This generalizes a result of I. Kapovich for hyperbolic groups. We also prove that any torsion-free group GG that is non-elementary and hyperbolic relative to P\mathbb P, contains a rank 2 free subgroup FF such that the group generated by "randomly" chosen elements r1,...,rmr_1,...,r_m in FF is aparabolic, malnormal in GG and quasiconvex relative to P\mathbb P and therefore hyperbolically embedded relative to P\mathbb P.

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