# Relative hyperbolicity of free-by-cyclic extensions

@inproceedings{Ghosh2018RelativeHO,
title={Relative hyperbolicity of free-by-cyclic extensions},
author={Pritam Kumar Ghosh},
year={2018}
}
Given a finite rank free group $\mathbb{F}$ of $\mathsf{rank}(\mathbb{F})\geq 3$, we show that the mapping torus of $\phi$ is (strongly) relatively hyperbolic if $\phi$ is exponentially growing. We combine our result with the work of Button-Kropholler to answer a question asked by Minasyan-Osin regarding the acylindrical hyperbolicity of such free-by-cyclic extensions. As an application we construct new examples of free-by-free hyperbolic extensions where the elements of the quotient group are… CONTINUE READING

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