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Interview at CIRM: Genevieve Walsh
Post-edited
Authors : Walsh, Genevieve (Interviewee)
CIRM (Publisher )
CIRM (Publisher )
Abstract :
'I am a geometric topologist, and I'm interested in problems in both geometric topology and geometric group theory. I study groups acting on spaces in a variety of contexts: groups acting on hyperbolic space with quotient the complement of a knot in S3, groups acting on trees, how to make a "good" space for a group to act on, and the many ways a particular group can act on a particular space. I also like to understand the geometry of these spaces.
I was trained (if a mathematician can be trained) as a 3-manifold topologist. Work that came out of my thesis showed that hyperbolic 2-bridge knot complements are virtually fibered. The relevant point is that every 2-bridge knot complement has a finite cover which is very nice geometrically: it is the complement of a link of great circles in S3. I've studied when a 3-manifold has a cover which contains an embedded incompressible surface, by using eigenspaces of covering group action. That every closed hyperbolic 3-manifold has such a cover is known as the virtually Haken conjecture. My current research on knot complements studies the question of commensurability: When do two manifolds or orbifolds have a common finite-sheeted cover? Commensurability is an equivalence relation on manifolds and orbifolds which is very rich even when restricted to knot complements. It tells us a lot about the geometry of the knot complement. For example, the shape of the cusp of a knot complement restricts its commensurability class.
Recently, I've been working on some questions about groups generated by involutions and the type of spaces they can act on. When does a right-angled Coxeter group act by reflections in hyperbolic space? When does the automorphism group of a reflection group act on a CAT(0) space? My approach to these group theoretical questions is deeply influenced by 3-dimensional hyperbolic manifolds and orbifolds. In turn, geometric group theory informs my research on manifolds and orbifolds.'
CIRM - Chaire Jean-Morlet 2018 - Aix-Marseille Université
MSC Codes : I was trained (if a mathematician can be trained) as a 3-manifold topologist. Work that came out of my thesis showed that hyperbolic 2-bridge knot complements are virtually fibered. The relevant point is that every 2-bridge knot complement has a finite cover which is very nice geometrically: it is the complement of a link of great circles in S3. I've studied when a 3-manifold has a cover which contains an embedded incompressible surface, by using eigenspaces of covering group action. That every closed hyperbolic 3-manifold has such a cover is known as the virtually Haken conjecture. My current research on knot complements studies the question of commensurability: When do two manifolds or orbifolds have a common finite-sheeted cover? Commensurability is an equivalence relation on manifolds and orbifolds which is very rich even when restricted to knot complements. It tells us a lot about the geometry of the knot complement. For example, the shape of the cusp of a knot complement restricts its commensurability class.
Recently, I've been working on some questions about groups generated by involutions and the type of spaces they can act on. When does a right-angled Coxeter group act by reflections in hyperbolic space? When does the automorphism group of a reflection group act on a CAT(0) space? My approach to these group theoretical questions is deeply influenced by 3-dimensional hyperbolic manifolds and orbifolds. In turn, geometric group theory informs my research on manifolds and orbifolds.'
CIRM - Chaire Jean-Morlet 2018 - Aix-Marseille Université
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Information on the Video
Film maker : Hennenfent, Guillaume ; Vareilles, StéphanieLanguage : English Available date : 09/08/2018 Conference Date : 05/07/2018 Series : Outreach Subseries : CIRM interviews arXiv category : Popularization Mathematical Area(s) : Mathematics Education & Popularization of Mathematics Format : MP4 (.mp4) - HD Video Time : 00:16:11 Targeted Audience : General Public Download : https://videos.cirm-math.fr/InterviewWALSH.mp4 
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Information on the Event
Event Title : Jean-Morlet Chair: Semester on 'Geometry, Topology, and Group Theory in Low Dimensions'Event Organizers : Walsh, Genevieve ; Paoluzzi, Luisa Dates : 01/02/2018 - 31/07/2018 Event Year : 2018 Event URL : https://www.chairejeanmorlet.com/2018-1-...
Citation Data
DOI : 10.24350/CIRM.V.19467703Cite this video as: Walsh, Genevieve (2018). Interview at CIRM: Genevieve Walsh. CIRM. Audiovisual resource. doi:10.24350/CIRM.V.19467703 URI : http://dx.doi.org/10.24350/CIRM.V.19467703 |
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