BEGIN:VCALENDAR VERSION:2.0 PRODID:researchseminars.org CALSCALE:GREGORIAN X-WR-CALNAME:researchseminars.org BEGIN:VEVENT SUMMARY:Will Cohen (University of Cambridge) DTSTART:20251113T133000Z DTEND:20251113T143000Z DTSTAMP:20260423T020956Z UID:GaTO/128 DESCRIPTION:Title: I mproving acylindrical actions on trees\nby Will Cohen (University of C ambridge) as part of Geometry and topology online\n\nLecture held in Room B3.02 in the Zeeman Building\, University of Warwick.\n\nAbstract\nLoosely speaking\, an action of a group on a tree is acylindrical if long enough paths must have small stabilisers. Groups admitting such actions form a n atural subclass of acylindrically hyperbolic groups\, and an interesting f eature of acylindrical actions on trees is that many properties of groups are inherited from their vertex stabilisers. In order to make use of this \, it is important to have some degree of control over these stabilisers. For example\, can we ask for these stabilisers to be finitely generated? Even stronger\, if our group is hyperbolic\, can we ask for the stabilise rs to be quasiconvex?\n\nI will introduce acylindrical actions as well as some stronger and related concepts. I will also discuss a method known as the Dunwoody—Sageev resolution. We use this to move between these conc epts and provide positive answers to the above questions in some cases.\n LOCATION:https://researchseminars.org/talk/GaTO/128/ END:VEVENT END:VCALENDAR