Geometric Group Theory (GGT) Seminar


2016-10-14 13:45: Embedding theorems, torsion, and quotients for groups. (Maurice Chiodo (University of Cambridge))

2016-10-21 13:45: Correspondences between harmonic functions and algebraic properties of groups. (Matthew Tointon (University of Cambridge))

2016-11-04 13:45: Commensuration index growth (Pierre-Emmanuel Caprace (Université catholique de Louvain))

2016-11-11 13:45: Automorphisms of free and surface groups and their fixed points (Enric Ventura (Universitat Politècnica de Catalunya))

2016-11-18 13:45: Triangles of groups, property (T), expanders and special quotients (Henry Wilton (University of Cambridge))

2016-11-25 13:45: Girth of random Cayley graphs (Peter Varju (University of Cambridge))

2016-12-02 13:45: Commensurability of right-angled Artin groups (Ilya Kazachkov (Bilbao))

2017-01-27 13:45: Surface subgroups of graphs of free groups (part 1 of 2) (Henry Wilton (University of Cambridge))

2017-02-03 13:45: Surface subgroups of graphs of free groups (part 2 of 2) (Henry Wilton (University of Cambridge))

2017-02-10 13:45: Weak forms of amenability (Erik Guentner (University of Hawaiʻi at Mānoa))

2017-02-17 13:45: On l^2-Betti numbers and their analogues in positive characteristic (Andre Jaikin (Madrid))

2017-02-23 10:00: Geometry of finite quotients of groups (Ana Khukhro (Neuchâtel))

2017-03-03 13:45: Buildings, surfaces and superrigidity (Alina Vdovina (Newcastle))

2017-03-17 13:45: (Leverhulme Lecture) Higher Teichmueller Theory: Geometric, Arithmetic, and non-Archimedean Aspects. Part 2 —  On maximal representations (Marc Burger (ETH Zurich))

2017-06-09 13:45: A Conjecture from 1986 about splittings of groups: its statement, potential generalizations, and Martin Dunwoody's proof (Peter Kropholler (University of Southampton))

2017-11-03 13:45: Linear groups without infinite order unipotents (Jack Button)

2017-11-10 13:45: A dependence theorem for free groups (Lars Louder (UCL))

2017-11-17 13:45: JSJ decompositions (Ben Barrett (University of Cambridge))

2017-11-24 13:45: Commuting probability in infinite groups  (Matthew Tointon (University of Neuchâtel))

2018-01-19 14:00: Kirillov's orbit method and polynomiality of the faithful dimension of $p$-groups (Mohammad Bardestani (University of Cambridge))

2018-01-26 14:00: A group-theoretic question arising in Typed set theory (Thomas Forster (University of Cambridge))

2018-02-09 14:00: Negative immersions for one-relator groups (Henry Wilton (University of Cambridge))

2018-02-16 13:45: Equations in groups (Laura Ciobanu (Heriot-Watt University))

2018-03-05 13:45: First order rigidity of higher rank arithmetic lattices (note the nonstandard day) (Chen Meiri (Technion, Haïfa))

2018-05-11 13:45: Alternating quotients of right-angled Artin groups (Michal Buran (University of Cambridge))

2018-05-25 13:45: Joint spectral radius and joint spectrum (Emmanuel Breuillard (University of Cambridge))

2018-06-15 13:45: Arithmetic and Dynamics on Markoff-Hurwitz Varieties (Alexander Gamburd (CUNY))

2018-07-06 13:00: Homotopy type of the free factor complex (Radhika Gupta (Technion))

2018-10-12 13:45: The abstract commensurator of Out(F_3) (Ric Wade (Oxford))

2018-10-19 13:45: Geometric results on linear actions of reductive Lie groups for applications to homogeneous dynamics (Rodolphe Richard (Cambridge))

2018-11-09 13:45: Residual properties of graphs of p-groups (Gareth Wilkes (Cambridge))

2018-11-16 13:45: The complexity of the knot genus problem (Mehdi Yazdi (Oxford))

2018-11-23 13:45: Percolation on hyperbolic groups (Tom Hutchcroft (Cambridge))

2019-01-25 13:45: Random triangular Burnside groups (John Mackay (Bristol))

2019-02-08 13:45: Coxeter groups, quiver mutations and hyperbolic manifolds (Anna Felikson (Durham))

2019-02-15 13:45: Profinite rigidity and hyperbolic triangle groups (Martin Bridson (Oxford))

2019-02-22 13:45: Group actions on quasi-median graphs and acylindrical hyperbolicity (Motiejus Valiunas (Southampton))

2019-03-15 13:45: Conjugacy Growth of Finitely Generated Groups (Alex Evetts (Heriot-Watt))

2019-04-09 13:45: Structure of nilpotent approximate groups and applications (Romain Tessera (Institut de mathématiques de Jussieu))

2019-05-10 13:45: Random groups with fixed relator lengths (Calum Ashcroft (Cambridge))

2019-05-17 13:45: Hyperbolic features of two-dimensional Artin groups (Alexandre Martin (Heriot-Watt))

2019-06-28 13:45: Separability of nilpotent and solvable groups (Mark Pengitore (Ohio State))

2019-07-12 13:45: 2,870,522 curves: Experimental evidence for Mirzakhani's Theorem (Mark Bell)

2019-10-18 13:45: Quantifying local embeddings into finite groups (Henry Bradford (University of Cambridge))

2019-11-01 13:45: Scl gaps in graph of groups and 3-manifolds (Nicolaus Heuer (University of Cambridge))

2019-11-08 13:45: Approximate actions and Ulam stability (Oren Becker (University of Cambridge))

2019-11-15 13:45: Conjugator length (Tim Riley (Cornell University))

2019-11-22 13:45: Contractibility of acyclic 2-complexes (Ian Leary (University of Southampton))

2019-12-06 13:45: Three dichotomies for connected unimodular Lie groups. (David Hume (University of Oxford))

2020-01-24 13:45: Incoherence and virtual fibering of free-by-free groups. (Robert Kropholler (Tufts University))

2020-01-31 13:45: Approximate lattices in amenable groups (Simon Machado (University of Cambridge))

2020-02-07 13:45: Ramanujan cubical complexes and non-residually finite groups in dimensions three and higher (Alina Vdovina (Newcastle University))

2020-02-14 13:45: Counting incompressible surfaces in 3-manifolds (Nathan Dunfield (University of Illinois))

2020-02-21 13:45: Polynomial-time proofs that groups are hyperbolic (Colva Roney-Dougal (University of St Andrews))

2020-03-06 13:45: Amenable groups and Noetherian group rings (Peter Kropholler (University of Southampton))

2020-03-13 13:45: Coherence of random groups (Gareth Wilkes (University of Cambridge))

2020-10-16 13:45: Quasi-isometric rigidity of graphs of free groups with cyclic edge groups (Daniel Woodhouse (University of Oxford))

2020-10-30 13:45: Accessibility of partially acylindrical actions (Michael Hill (University of Cambridge))

2020-11-06 13:45: Topological completions of quasi-actions and discretisable spaces (Alex Margolis (Vanderbilt University))

2020-11-13 13:45: Random 3-manifolds with boundary (Bram Petri (Sorbonne))

2020-11-20 13:45: New examples of groups of intermediate growth (Volodymyr Nekrashevych (Texas A&M))

2020-11-27 13:45: Linear isoperimetric functions for surfaces in hyperbolic groups (Macarena Arenas (University of Cambridge))

2020-12-04 13:45: Understanding wreath products and invariable generation (Charles Cox (University of Bristol))

2021-01-22 13:45: Stable commutator length on RAAGs (Nicolaus Heuer (University of Cambridge))

2021-01-29 13:45: Cubulating groups acting on polygonal complexes (Calum Ashcroft (University of Cambridge))

2021-02-05 13:45: Curve Graphs and Surface Diffeomorphism Groups (Sebastian Hensel (University of Munich))

2021-02-12 13:45: An algebraic approach to residually nilpotency (Andrei Jaikin-Zapirain (Autonomous University of Madrid))

2021-02-19 13:45: Some elementary correspondence in group theory (with applications to algebra/geometry) (D. B. McReynolds (Purdue University, Indiana))

2021-02-26 13:45: Kaplansky's conjectures (Giles Gardam (University of Münster))

2021-03-05 13:45: Super-expanders (Alexandros Eskenazis (University of Cambridge))

2021-03-12 13:45: Rank gradient, cost, and simplicial volume (Clara Löh (Universät Regensburg))

2021-04-30 13:45: The compressed word problem in relatively hyperbolic groups (Sarah Rees (Newcastle University))

2021-05-07 13:45: Virtually unipotent elements of 3-manifold groups (Sami Douba (McGill University))

2021-05-14 13:45: Algebraically hyperbolic groups (Alan Logan (Heriot-Watt University))

2021-05-21 13:45: About higher graph manifolds  (Haydeé Contreras Peruyero (UNAM))

2021-05-28 13:45: All finitely generated 3-manifold groups are Grothendieck rigid (Hongbin Sun (Rutgers))

2021-06-04 13:45: Quasi-trees and product set growth (Alice Kerr (University of Oxford))

2021-06-11 13:45: Geometric approximate group theory (Matt Cordes (ETH Zurich))

2021-06-25 13:45: Combinatorics via Closed Orbits: Vertex Expansion and Graph Quantum Ergodicity (Amitay Kamber (University of Cambridge) )

2021-10-15 13:45: The taut spectrum and the Eilenberg-Ganea problem (Luis Jorge Sanchez Saldana (UNAM))

2021-10-29 13:45: Hyperplanes all over the place (Abdul Zalloum (Queen's University, Canada))

2021-11-05 13:45: When does a one-relator group have a quasi-convex hierarchy? (Marco Linton (University of Warwick))

2021-11-12 13:45: Parabolic subgroups of two-dimensional Artin groups and systolic-by-function complexes (Martín Blufstein (Universidad de Buenos Aires))

2021-11-19 13:45: Character varieties of random groups (Oren Becker (University of Cambridge))

2021-11-26 13:45: Groups acting properly on (products of) hyperbolic graphs (Jack Button (University of Cambridge))

2021-12-03 13:45: Fixed points of group homomorphisms and the Post Correspondence Problem (Laura Ciobanu (Heriot-Watt University))

2022-01-21 13:45: A Deligne complex for Artin monoids (Rachael Boyd (University of Cambridge))

2022-01-28 13:45: Title to be confirmed (Mikael de la Salle (Université de Lyon))

2022-02-04 13:45: Hyperplanes all over the place  (Abdul Zalloum (Queen's University, Canada))

2022-02-11 13:45: Equations in periodic groups  (Remi Coulon (University of Rennes))

2022-02-18 13:45: The isomorphism problem for Artin groups.  (Nicolas Vaskou (Heriot-Watt University))

2022-02-25 13:45: Euler characteristics for complexes of graphs (Karen Vogtmann (University of Warwick))

2022-03-04 13:45: Whitehead's algorithm for free groups and the free factor complex (Dario Ascari (University of Oxford))

2022-03-11 13:45: A cubical Rips Construction (Macarena Arenas (University of Cambridge))

2022-04-29 13:45: Laudenbach’s sequence for mapping class groups of connect sums of S^2 x S^1 (Tara Brendle (University of Glasgow))

2022-05-06 13:45: Codimension-1 subgroups of hyperbolic groups with spherical boundary (Corey Bregman (University of Southern Maine))

2022-05-13 13:45: Profinitely Rigid Seifert Fibered Spaces and Grothendieck’s Problem (Ryan Spitler (Rice University))

2022-05-20 13:45: Real cubings (Mark Hagen (University of Bristol))

2022-05-27 13:45: Quantifying lawlessness in finitely generated groups (Henry Bradford (University of Cambridge))

2022-06-17 13:45:  Computing bounded cohomology of discrete groups (Francesco Fournier-Facio (ETH Zurich))

2022-10-14 13:45: Discrete group actions on 3-manifolds and embeddable Cayley complexes. (Agelos Georgakopoulos (University of Warwick))

2022-10-21 13:45: Duality groups and Cohen-Macaulay spaces (Ric Wade (University of Oxford))

2022-11-04 13:45: Braiding Groups of Homeomorphisms of the Cantor Set (Rachel Skipper (ENS-Paris))

2022-11-11 13:45: Detecting free factors in profinite completions (Alejandra Garrido (Universidad Autónoma de Madrid))

2022-11-18 13:45: Hierarchically hyperbolic groups: an introduction (Jason Behrstock (Lehman College, CUNY))

2022-11-25 13:45: Amenable open covers of right-angled Artin groups  (Kevin Li (University of Regensburg))

2023-01-20 13:45: Computing high-dimensional group cohomology via duality (Benjamin Brueck (ETH Zurich))

2023-01-27 13:45: The rates of growth in a hyperbolic group (Koji Fujiwara (Kyoto University))

2023-02-03 13:45: Do moduli spaces of surfaces exist? and the mapping class group. (Selim Ghazouani (UCL))

2023-02-10 13:45: The profinite and pro-p genus of free and surface groups. (Ismael Morales (University of Oxford))

2023-02-17 13:45: Stable commutator length in free and surface groups (Alexis Marchand (University of Cambridge))

2023-02-24 13:45: Growth and subgroups of Out(F_n). (Yassine Guerch (ENS Lyon))

2023-03-10 13:45: Subgroups of hyperbolic groups, finiteness properties and complex hyperbolic lattices (Pierre Py (Université de Strasbourg))

2023-04-28 13:45: On profinite properties of free-by-cyclic groups (Monika Kudlinska (Oxford))

2023-05-05 13:45: Coarse embeddings, and yet more ways to avoid them (David Hume (Bristol))

2023-05-19 13:45: Symmetries of the free-factor complex and commensurator rigidity   (Martin Bridson (University of Oxford))

2023-09-11 14:00: Sausages and Butcher Paper (Danny Calegari, University of Chicago)

2023-09-29 13:45: Drilling Hyperbolic Groups (Daniel Groves, University of Illinois at Chicago)

2023-10-06 13:45: 3-Manifold Groups Acting Acylindrically on Trees (William Cohen, University of Cambridge)

2023-10-11 13:45: The space of traces of certain discrete groups (Raz Slutsky, Weizmann Institute of Science)

2023-10-20 13:45: Profinite Recognition of Amalgamated Factors (Julian Wykowski, University of Cambridge)

2023-10-27 13:45: Free-by-cyclic groups and deficiency  (Martin Bridson, Oxford)

2023-11-03 13:45: On Gromov–Thurston polyhedra (Sami Douba, IHES)

2023-11-10 13:45: Dyer groups: Coxter groups, right-angled Artin groups and more (Mireille Soergel, MPI Leipzig)

2023-11-17 13:45: Approximating hyperbolic lattices by cubulations (Eduardo Reyes, Max Planck Institute Bonn)

2023-11-24 13:45: Asymptotically CAT(0) metrics and applications (Alessandro Sisto, Heriot Watt)

2024-01-19 13:45: Recognisably context-free subsets of groups (Alex Levine, Manchester)

2024-01-26 13:45: Isomorphism Problems for Artin groups (Alexandre Martin, Heriot-Watt)

2024-02-09 14:30: Invariants of groups acting on buildings (Ilaria Castellano, Bielefeld)

2024-02-16 13:45: Generating RAAGs in 1-relator groups (Ashot Minasyan, Southampton)

2024-02-23 13:45: A quasi-isometrically diverse class of bi-orderable solvable and residually finite groups via Taut Dehn spectra (Arman Darbinyan, Southampton)

2024-03-01 13:45: First-order logic and acylindrically hyperbolic groups (Jonathan Fruchter, Bonn)

2024-03-08 13:45: Even Artin groups of FC-type (Yago Antolin)

2024-05-03 13:45: Virtual fibration and incoherence of trivalent triangle groups (Ana Isakovic, Cambridge)

2024-05-08 16:00: Group rings and hyperbolic geometry (Grigori Avramidi, Bonn)

2024-05-09 13:45: The weight of groups and complexity of surface maps (Lvzhou Chen, Purdue)

2024-05-17 13:45: Realizing finite subgroups of outer automorphism groups of RAAGs (Ruth Charney, Brandeis)

2024-05-24 13:45: Hilbert-Schmidt stability, character theory and approximation properties of groups (Alon Dogon, Weizmann Institute of Science)

2024-05-31 13:45: "Almost" Representations and Group Stability (Bharatram Rangarajan, Hebrew University of Jerusalem)

2024-06-07 13:45: Recent progress towards the Putman-Wieland conjecture (Adam Klukowski, Oxford)

2024-10-04 13:45: Prosoluble subgroups of the profinite completion of 3-manifold groups (Pavel Zalesski (Brasilia))

2024-10-11 13:45: Cohomology of subgroups of SL2 (Henrique Souza (Madrid))

2024-10-18 13:45: Locally compact groups with varying finiteness length (Yuri Santos Rego (Lincoln))

2024-11-01 13:45: On subgroups of right-angled Artin groups (Montserrat Casals-Ruiz (Bilbao))

2024-11-08 13:45: Real cubings (Ilya Kazachkov (Bilbao))

2024-11-13 13:30: Subgroup Tests and the Aldous-Lyons conjecture (Michael Chapman (NYU))

2024-11-15 13:45: Informal discussion (Michael Chapman (NYU))

2024-11-22 13:45: Two-generator subgroups of free-by-cyclic groups (Edgar Bering (SJSU))

2024-11-29 13:45: Subgroups and diversity of left-orderable small cancellation groups (Markus Steenbock (Vienna))

2025-01-24 13:45: Amenable open covers and simplicial volume of manifolds with boundary (Pietro Capovilla, SNS Pisa)

2025-01-31 13:45: Cannon-Thurston maps for the Morse boundary (Matt Cordes, Heriot-Watt)

2025-02-14 13:45: On the congruence subgroup property for mapping class groups of surfaces (Henry Wilton, Cambridge)

2025-02-21 13:45: Vanishing results in the homology of big mapping class groups and Thompson-like groups (Martin Palmer, Leeds)

2025-02-28 13:45: The strong Atiyah conjecture for graph of groups via universal localizations. (Pablo Sánchez-Peralta, UAM)

2025-03-07 13:45: Virtually free-by-cyclic RFRS groups (Sam Fisher (Oxford))

2025-03-14 13:45: Short loxodromics in graph products (Alice Kerr, Bristol)

2025-05-02 13:45: Normal subgroups of non-torsion multi-EGS groups (Anitha Thillaisundaram, Lund)

2025-05-14 16:00: Profinite rigidity of Kähler groups (Claudio Llosa Isenrich (KIT))

2025-05-23 13:45: Dehn functions of Bestvina—Brady groups (Jerónimo García-Mejía, Oxford)

2025-06-06 13:45: Projections, walls and stable cylinders (Davide Spriano, Oxford)

2025-06-13 13:45: Hyperbolic groups and the cops and robbers game (Raphael Appenzeller, Heidelberg)

2025-08-06 11:00: The Hardy-Littlewood maximal inequality for hyperbolic groups (Koji Fujiwara, Kyoto)

2025-08-13 11:00: Title to be confirmed (Marco Linton, ICMAT)

2025-08-20 11:00: Title to be confirmed (Michael Bronstein, Oxford)

2025-10-17 13:45: Generation-2 proof of the Classification of Finite Simple Groups. (Inna Capdeboscq, Warwick)

2025-10-24 13:45: The Cohen-Lyndon property, coherence, and immersions (Macarena Arenas (University of Cambridge))

2025-11-07 13:45: Linearity criteria for automorphism groups of hyperbolic groups (Mark Pengitore, IMPAN)

2025-11-14 13:45: Spectral gaps for stable commutator length via angle structures (Alexis Marchand, IMPAN)

2025-11-21 13:45: Topological and  Algebraic Aspects of Virtual Artin Groups (Federica Gavazzi, Heriot-Watt)

2026-01-23 13:45: Subgroup mixing in Baumslag-Solitar groups (Sasha Bontemps (ENS Lyon))

2026-01-30 13:45: Deficiency 1 groups and SQ universality (Jack Button (Cambridge))

2026-02-06 13:45: The flat closing problem (Bruno Martelli (Università di Pisa))

2026-02-20 13:45: Profinite genus of HNN-extensions and free products with amalgamation. (Pavel Zalesski (Brasilia))

2026-02-27 13:45: What is the probability that two elements of a group commute? (Armando Martino (Southampton))

2026-03-06 13:45: Groups of automorphisms of trees and their bounded cohomology (Elena Bogliolo (Pisa))

2026-03-13 13:45: On generalised presentations over topological groups (Brita Nucinkis (Royal Holloway))

2026-05-01 13:45: Hausdorff spectrum of p-adic analytic pro-p groups ( Anitha Thillaisundaram (Lund))

2026-05-29 13:45: Title to be confirmed (Sam Hughes (Bonn))

2026-06-05 13:45: Title to be confirmed (Johan Öinert (Blekinge))

2026-06-12 13:45: Title to be confirmed (Dídac Martinez Granado (Luxemburgh))

2026-06-26 13:45: Title to be confirmed (Motiejus Valiunas (Wroclaw))