Distortion of Surface Groups in CAT(0) free-by-cyclic Groups |
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Authors: | Josh Barnard Noel Brady |
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Institution: | (1) Department of Mathematics, University of Oklahoma, Norman, OK 73019, USA |
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Abstract: | Given a non-positively curved 2-complex with a circle-valued Morse function satisfying some extra combinatorial conditions, we describe how to locally isometrically embed this in a larger non-positively curved 2-complex with free-by-cyclic fundamental group. This embedding procedure is used to produce examples of CAT(0) free-by-cyclic groups that contain closed hyperbolic surface subgroups with polynomial distortion of arbitrary degree. We also produce examples of CAT(0) hyperbolic free-by-cyclic groups that contain closed hyperbolic surface subgroups that are exponentially distorted. |
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Keywords: | CAT(0) complex Distortion Hyperbolic free-by-cyclic group |
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