## Geometric Group Theory in East Asia

#### Description

Welcome to the the GGTea Webinar.

The webinar provides a platform for communication and collaboration among young researchers in geometric group theory. We meet weekly for a one-hour talk followed by half an hour of informal discussion and tea. The talks should be accessible to graduate students. All are welcome to join.

The seminar usually takes place on Fridays at 10am (China) / 11am (Korea, Japan) / 12pm (Aus EST) / 9pm Thursday (US ET), unless otherwise adjusted for the speaker. The talks will be hosted on Zoom. All are welcome to tune in.

** Meeting ID**: 982 4085 5770

** Passcode**: a space satisfying the thin triangle property is called a ??? space (10 letters lower case).

#### This week

December 17 10am China Time: Ivan Levcovitz Title: Random BMW groups Abstract: BMW (Burger-Mozes-Wise) groups are a class of groups that act geometrically on the product of two infinite, regular trees. For large enough trees, these groups admit the same coarse geometry (they are all pairwise quasi-isometric), yet they can be algebraically quite different. In fact, by a celebrated result of Burger-Mozes, these groups can even be virtually simple. In this talk, I will discuss a random model for generating BMW groups and how we use ideas from this model to solve counting problems related to these groups. This is joint work with Nir Lazarovich and Alex Margolis. |

#### 2021 Schedule

Date |
Speaker |
Title |

Dec. 17 | Ivan Levcovitz | Random BMW groups |

Dec. 10 | Asaf Hadari | Uniform recurrence in linear group |

Dec. 3 | Yvon Verberne | The asymptotic dimension of big mapping class groups |

Nov. 26 | Xiaoming Du | The torsion generating set of the extended mapping class groups |

Nov. 19 | Abdul Zalloum | Hyperbolicity in mapping class groups and right-angled Artin groups |

Nov. 12 | Tarik Aougab | Properties of random curves |

Nov. 5 4pm | Elia Fioravanti | Automorphisms and splittings of special groups |

Oct. 29 | Motoko Kato | Acylindrical hyperbolicity of some Artin-Tits groups |

Oct. 22 | Sahana Balasubramanya | Actions of solvable groups on hyperbolic spaces |

Oct. 15 | Yu-Wei Fan | Quasimorphisms on the automorphism groups of certain triangulated categories |

Oct. 8 | Mark Pengitore | Coarse embeddings and homological filling functions |

Sep. 24 | Qing Liu | Rigidity of the Morse boundary |

Sep. 17 4pm | Mark Hagen | Real Cubings |

Sep. 10 | Tsukasa Ishibashi | Sign stability of mapping classes on marked surfaces |

June 25 | Anne Thomas | Fixed points for group actions on 2-dimensional buildings |

June 18 | Krishnendu Gongopadhyay | Reversibility of Hermitian Isometries |

June 11 | Murray Elder | Deciding plainness in PSPACE |

June 4 (4pm) | Edgar A. Bering IV | An algorithm to decide if a free-by-cyclic group is a 3â€“manifold group |

May 28 | Tomohiro Fukaya | Visual maps between coarsely convex spaces |

May 14 | Huiping Pan | Local rigidity of the Teichmuller space in the Thurston metric |

May 7 | Kasra Rafi | The sublinearly morse boundary |

April 30 (4pm) | Richard Webb | Homeomorphisms of surfaces, rotation sets, and the fine curve graph |

April 23 | Dounnu Sasaki | Currents on cusped hyperbolic surfaces and denseness property |

April 16 | Masato Mimura | The Green-Tao theorem for number fields |

April 9 | Yi Liu | Finite-volume hyperbolic 3-manifolds are almost determined by their finite quotient groups |

April 2 | Thomas Ng | Automorphism groups of one-ended groups that satisfy a uniform exponential growth subgroup alternative |

Mar. 26 (4pm) | Valentina Disarlo | The model theory of the curve graph |

Mar. 19 | Derrick Wigglesworth | The Farrell-Jones Conjecture for (most) hyperbolic-by-cyclic groups |

Mar. 12 | Ingrid Irmer | A topology on mapping class groups |

Feb. 26 | Camille Horbez (4pm Beijing Time) | Measure equivalence rigidity of Out(Fn) |

Jan. 15 | Kim Ruane | Boundary rigidity of groups acting on a product of two trees |

Jan. 8 | Xiangdong Xie | Groups whose left invariant metrics are roughly similar |

#### 2020 Schedule

Dec. 18 | Ryokichi Tanaka | Topological flows for hyperbolic groups |

Dec. 11 | Giulio Tiozzo (4pm Beijing Time) | The fundamental inequality for hyperelliptic Fuchsian groups |

Dec. 4 | Hung C. Tran | Divergence of finitely presented groups |

Nov. 27 | Rémi Coulon (3pm Beijing Time) | Automorphisms with exotic growth |

Nov. 20 | Jing Tao | Polygons, Horogons, and the Nielsen-Thurston Classification Theorem |

Nov. 13 | Yvon Verberne | Strong contractability of geodesics in the mapping class group |

Nov. 6 | Tomoshige Yukita | Continuity of the growth rate on the space of Coxeter groups |

Oct. 30 | 🍁 Fall Social | Lightning talks and open problems (program) |

Oct. 23 | Wenyuan Yang | Croke-Kleiner admissible groups: Property (QT) and quasiconvexity |

Oct. 16 | Hoang Nguyen | Quasiconvexity in 3-manifold groups |

Oct. 9 | Yulan Qing | Introduction to big mapping class groups |

Sep. 25 | Hidetoshi Masai | Continuity of the drift of mapping class group |

Sep. 18 | Hyungryul Baik | Some problems in low-dimensional topology with dynamic nature |

Sep. 11 | Koji Fujiwara | The rates of growth in a hyperbolic group.(slides) |

**Organizers**: Hyungryul Baik (KAIST), Ingrid Irmer(SUSTech), Sang-Hyun Kim (KIAS/KAIST), Hidetoshi Masai (Tokyo Tech), Yulan Qing (Fudan), Robert Tang (XJTLU), Wenyuan Yang (Peking).

#### Mailing list

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