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Title page for ETD etd-04092013-113226

Type of Document Dissertation
Author Hull, Michael Bradley
URN etd-04092013-113226
Title Properties of acylindrically hyperbolic groups and their small cancellation quotients
Degree PhD
Department Mathematics
Advisory Committee
Advisor Name Title
Denis Osin Committee Chair
Alexander Olshanskiy Committee Member
Mark Sapir Committee Member
Michael Mihalik Committee Member
Thomas Weiler Committee Member
  • acylindrically hyperbolic groups
  • small cancellation
Date of Defense 2013-04-08
Availability unrestricted
We investigate the class of acylindrically hyperbolic groups, which includes many examples of groups which admit natural actions on hyperbolic metric spaces, such as hyperbolic and relatively hyperbolic groups, mapping class groups, and outer automorphism groups of free groups. First, we prove an extension theorem for quasi-cocyles which has applications to bounded cohomology and stable commutator length of subgroups in acylindrically hyperbolic groups. Next, we show that a version of small cancellation theory developed for hyperbolic groups and relatively hyperbolic groups by Olshankii and Osin respectively can be extended to the class of acylindrically hyperbolic groups. We give several applications of this small cancellation theory, including showing how it can be used to build various ``exotic" quotient groups. In addition, we show that these small cancellation techniques can be used to completely classify conjugacy growth functions of finitely generated groups.
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