## Hyperbolic Lunch

Hyperbolic lunch is an informal talk that takes place at noon in my office (BA 6188). They generally last around 90 minutes and the talks are often interrupted by many questions. People bring their lunches to my office and eat as they listen to the talk. The audience consists of graduate students and postdocs and an occasional faculty or undergraduate interested in hyperbolic geometry or related topics in geometry, topology, group theory and dynamics. The topics are often what someone has learned recently and not necessarily a result by the speaker.

If you are in Toronto and have a fun topic you can talk about, you should consider doing one of these lunches. The talks should be accessible to graduate students. We appreciate beautiful math even when it is elementary and would like to know about math as much as about stories of how math gets done.

#### 2019 Schedule

Date | Speaker | Title | |
---|---|---|---|

March 14 | Thomas Dykes | Sum of squares property in groups | |

March 7 | Assaf Bar-Natan | The Earth is Flat in the Eyes of the Law | |

February 28 | Yulan Qing | Sublinear boundary of a CAT(0) group | |

February 21 | Zachary Schutzman | Shape Analysis for Redistricting | |

February 14 | Ivan Telpukhovskiy | On normalizations of Thurston measure on the space of measured laminations | |

February 7 | Chris Karg | Infiinite regular translation surfaces | |

January 31 | Ilya Gekhtman | Invariant random subgroups and their growth rates | |

January 24 | Adriano Pacifico | The desingularization Theorem | |

January 17 | Keivan Mallahi Karai | Spectral independence and random walks on products of compact groups |

#### 2018 Schedule

Date | Speaker | Title |
---|---|---|

July 4 | Jordan Hofmann | Hyperbolic Isometries and the Double cover SU(2) to SO(3) (see notes) |

June 14 | Ivan Telpukhovskiy | Arithmetic hyperbolic surfaces: without cusps |

June 7 | Ivan Telpukhovskiy | Arithmetic hyperbolic surfaces: with cusps |

May 17 | Ruth Charney | Artin groups: what are they and why are they interesting? |

May 30 | Adriano Pacifico | Thurston Stretch Paths |

May 10 | Maxime Fortier Bourque | Local maxima of the systole function |

May 3 | Ivan Telpukhovskiy | Masur's criterion does not hold in Thurston metric |

April 4 | Yvon Verberne | Strong Contractibility in the Mapping class group. |

March 28 | Bram Petri | Random surfaces |

March 22 | Giulio Tiozzo | Generating functions and counting in RAAGs |

March 15 | Assaf Bar-Natan | How we tried to fix redistricting, and ended up doing group theory |

March 7 | Dmitri Gekhtman | Dynamics in the space of bounded holomorphic functions on the polydisk |

March 1 | Jeffrey Carlson | Commensurability of surface automorphisms |

February 15 | Justin Martel | Kantorovich Singularity Functor and Homotopy-Reductions |

February 8 | Maxime Fortier Bourque | The Art Gallery Problem |

February 1 | Yulan Qing | Guirardel core and relative twisting |

January 25 | Keivan Mallahi | Oppenheim conjecture, and its generalization to the S-arithmetic case |

January 18 | Tanran Zhang | Hyperbolic-type distance on punctured spheres |

#### 2017 Schedule

Date | Speaker | Title |
---|---|---|

December 13 | Funda Gültepe | Cannon-Thurston map |

December 8 | Maxime Scott | Teichmüller theorems for topological branched covers |

November 15 | Camille Hornez | Automorphisms of hyperbolic groups and growth |

October 31 | Maxime Fortier Bourque | Scissors congruences and Dehn's dissection theorem |

October 25 | Jeff Carlson | Accidental Isomorphisms between Lie groups |

October 11 | Joseph Maher | Generic foliations via electrification |

October 4 | Yulan Qing | Efficient geodesic in the curve complex |

September 27 | Giulio Tiozzo | Dimension of invariant subsets of the circle |

September 20 | Pat Hooper | Maximal square tiled surface with regular cylinder patterns |

September 8 | Howard Masur | Ergodic theory and interval exchange transformations |

August 8 | Yulan Qing | Convexity of the Outer Space |

August 1 | Eko Hironaka | The minimum dilatation for pseudo-Anosov mapping classes |

July 26 | Adriano Pacifico | Maximal stretch over simple closed curves |

July 19 | Kasra Rafi | Limit sets of Teichüller geodesics in PML |

July 12 | Anja Randecker | Siegel-Veech constants and the diameter of translation surfaces |

June 28 | Jeff Carlson | Reading Course III |

June 21 | Anne Thomas | QI classification of Coxeter groups and Bowditch JSJ decomposition |

June 7, 14 | Aaron Fenyes | Reading Course II |

May 24, 30 | Ivan Telpukhovskiy | Reading Course I |

May 3 | Vitali Kapovitch | Which subsets of R^n are CAT(0) |

April 12 | Ivan Telpukhovskiy | The Euler characteristic of the moduli space of curves |

April 5 | Kasra Rafi | A gentle introduction to the Teichmüller space of a torus |

March 29 | Anja Randecker | Veech groups of Loch Ness monsters |

March 14 | Sam Taylor | |

March 8 | Jonah Gaster | |

March 1 | Aaron Fenyes | Shearing Coordinates |

February 8 | Maxime Fortier Bourque | How to compute Teichmüller distance numerically in the space of hexagons |

January 18 | Curt McMullen | |

January 11 | Yvon Verberne | How to Generate the Mapping Class Group |