Seminars and Working Groups

Geometry and Topology Seminar - Organized by Julien Keller and Duncan McCoy

Normally the Seminar is held Fridays at 11:00 AM in room PK-5115, Président-Kennedy Building, UQAM. All changes are indicated. Currently the CIRGET Seminar meets virtually except for local speakers.
Zoom link: https://uqam.zoom.us/j/98999725241

  • September 17, 2021 == Alix Deruelle, Sorbonne Université
    A relative entropy for expanders of the Ricci flow (joint work with Felix Schulze, Warwick University) - slides
  • September 24, 2021 == Xuwen Zhu, Northeastern University
    Constant curvature conical metrics - slides and talk
  • October 1, 2021 == Alberto Cavallo, UQAM, PK-5115
    Slice links and smooth 4-manifolds
  • October 8, 2021 == Michael Albanese, UQAM, PK-5675
    The Yamabe Invariant of Complex Surfaces
  • October 15, 2021 == Peter Feller, ETH Zurich
    Braids, quasimorphisms, and slice-Bennequin inequalities - slides and talk
  • October 22, 2021 == Yang Li, MIT
    Metric SYZ conjecture - slides and talk
  • October 29, 2021 == Marco Golla, Nantes
    3-manifolds that bound no definite 4-manifold - talk
  • November 5, 2021 at 11:30 == Sucharit Sarkar, UCLA
    Mixed invariants in Khovanov homology for unorientable cobordisms - talk
  • November 12, 2021 == Ruadhai Dervan, Cambridge
    Stability conditions for polarised varieties - talk
  • November 19, 2021 == Ya Deng, Université de Lorraine
    Big Picard theorem for varieties admitting nilpotent harmonic bundles - talk
  • November 26, 2021 == Gilles Carron, Université de Nantes
    Kato's Limits - slides and talk
  • December 3, 2021 == Steven Sivek, Imperial College
    Small Dehn surgery and SU(2) - talk
  • December 10, 2021 == Nathan Grieve, RMC, Carleton
    On topics that surround the Cone Theorem, K-stability and Diophantine Arithmetic Geometry - talk
  • December 17, 2021 == Adam Jacob, UC Davis
    Special Lagrangian torus fibrations on Del Pezzo and Rational Elliptic Surfaces - talk
  • January 14, 2022 == Ethan Addison, University of Notre Dame
    Generalizing Poincaré-Type Kähler Metrics - slides
  • January 21, 2022 == Francesco Lin, Columbia
    Closed geodesics and Frøyshov invariants of hyperbolic three-manifolds - talk
  • January 28, 2022 == Xi Sisi Shen, Columbia
    A Chern-Calabi flow on Hermitian Manifolds - slides and talk
  • February 4, 2022 == Michael Albanese, UQAM, PK-5115
    Spinh and further generalisations of spin
  • February 11, 2022 == Kyle Hayden, Columbia
    Where are the complex curves in Khovanov homology? - talk
  • February 18, 2022 == Ruiran Sun, CIRGET
    Algebraicity of holomorphic maps to varieties with big representation of \(\pi_1\)
  • February 25, 2022 == Jacob Caudell, Boston College
    Lens space surgeries, lattices, and the Poincaré homology sphere - talk
  • March 11, 2022 == Louis Ioos, Max Planck
    Quantization methods in the Yau-Tian-Donaldson program - slides and talk
  • March 18, 2022 == Dennis The, UiT The Arctic University of Norway, PK-5115
    Simply-transitive CR real hypersurfaces in \(C^3\)
  • March 25, 2022 == Tyrone Ghaswala, UQAM, PK-5115
    Small covers of big surfaces
  • April 1, 2022 == Alan Reid, Rice University
    Embedding and bounding geometrically rational homology 3-spheres - talk
  • April 8, 2022 == Allison Moore, Virginia Commonwealth
    Cosmetic surgery, cosmetic crossings - talk
  • April 22, 2022 == Alexandre Girouard, Laval, PK-5675
    Steklov eigenvalues, homogenization and free boundary minimal surfaces
  • April 29, 2022 == Jean-Philippe Burelle, Sherbrooke, PK-5675
    Piecewise circular curves and flag positivity - talk
  • May 6, 2022 == Joel Kamnitzer, Toronto, PK-5675
    Symplectic duality and affine Grassmannian slices - talk
  • May 27, 2022 == Aldo Witte, KU Leuven, PK-5675
    Singular fibrations in toric and Poisson geometry - talk

Geometric Group Theory Seminar - Organized by Zachary Munro, William Chong, and Daniel Wise

The seminar is held on Wednesdays at 3:00 PM in 920 Burnside Hall

  • September 15, 2021 == Sami Douba, McGill University
    Proper CAT(0) actions of unipotent-free linear groups
  • September 22, 2021 == Zachary Munro, McGill University
    Hyperbolic groups and geometric group theory
  • September 29, 2021 == William Chong, McGill University
    Small cancellation theory and word problems
  • October 6, 2021 == Catherine Pfaff, Queen's University
    A Brief (Hopefully Gentle) Introduction to Out(F_r),
    Culler-Vogtmann Outer Space, & Out(F_r) Conjugacy Class Invariants
  • Thursday, October 14, 2021 == Michah Sageev, Technion - Israel Institute of Technology
    Right angled Coxeter groups acting on CAT(0) cube complexes.
  • October 20, 2021 == Daniel Wise, McGill
    Complete Square Complexes
  • October 27, 2021 == Daniel Wise, McGill
    Complete Square Complexes II
  • November 3, 2021 == William Chong, McGill
    An uncountable family of finitely generated residually finite groups
  • November 10, 2021 == Daniel Wise, McGill
    Introductory level talk on residual finiteness
  • November 17, 2021 == Tyrone Ghaswala, UQAM
    Mapping class groups, coverings, braids and groupoids
  • November 24, 2021 == Alex Lubotzky, Hebrew Univ / Weizmann Institute / IAS
    The C3 problem: error-correcting codes with a constant rate, constant distance, and constant locality
  • December 1, 2021 == Catherine Pfaff, Queen's University
    Train (track)s, loops, & iteration. What does a typical element of Out(F_r) look like?
  • December 8, 2021 == Thomas Koberda, University of Virginia
    Hamiltonicity of graphs via right-angled Artin groups
  • February 9, 2022 == Daniel Wise, McGill
    Introductory level talk on residual finiteness continued
  • February 16, 2022 == Sami Douba, McGill
    Thin right-angled Coxeter subgroups of some arithmetic lattices
  • February 23, 2022 == Daniel Wise, McGill
    Introductory level talk on residual finiteness continued
  • March 9, 2022 == William Chong, McGill
    One-relator Product of Cyclic Groups
  • March 16, 2022 == Daniel Wise, McGill
    One-relator groups
  • March 23, 2022 == William Ghanem, McGill
    CAT(0) Cube Complexes: The Dual Complex and Finiteness Properties
  • April 6, 2022 == Christopher Karpinski, McGill
    The generalized conjugacy problem in hyperbolic and relatively hyperbolic groups
  • April 13, 2022 == Christopher Karpinski, McGill
    The generalized conjugacy problem in hyperbolic and relatively hyperbolic groups II

CIRGET Junior - Organized by Houari Benammar Ammar

The Seminar is held on Wednesdays at 2:30 PM, PK-5675, UQAM

  • March 16, 2022 == Paul Cusson, McGill University
    Classifying vector bundle filtrations with infinite flag manifolds and other problems
  • CANCELLED - March 23, 2022 == Paul Cusson, McGill University
    Classifying vector bundle filtrations with infinite flag manifolds and other problems II
  • March 30, 2022 == Lydia Mezrag, Université de Montréal
    K-theory and Hamiltonian fibrations
  • April 6, 2022 == Chenxi Yi, UQAM
    Introduction to the Yau-Tian-Donaldson Conjecture
  • April 13, 2022 == Ludovic D'Anjou Madoré, UQAM
    Categorical Logic, Topos Theory and Applications
  • April 27, 2022 == Benabida Oussama, UQAM
    Convergence of the Krylov Bogolyubov procedure in Bowen's example
  • May 18, 2022 == Ruiran Sun, McGill
    Variation of Hodge structures on curves and Fujita decomposition
  • May 25, 2022 == Giacomo Bascape, UQAM
    SU(2) representation of triangles group

Symplectic Seminar - Organized by: Octav Cornea (Montréal), Helmut Hofer (IAS), Vincent Humilière (Paris), Agustin Moreno (IAS), Leonid Polterovich (Tel Aviv), Egor Shelukhin (Montréal), Shira Tanny (IAS), Sara Tukachinsky (Tel Aviv), Claude Viterbo (Paris)

The seminar meets by ZOOM on Fridays at 9:15. The new Symplectic Zoominar is co-organized with Princeton/IAS, Tel Aviv and Paris.

  • October 8, 2021 == Jean-Philippe Chassé, UdeM; Leo Digiosia, Rice; Rima Chatterjee, Cologne
    Convergence and Riemannian bounds on Lagrangian submanifolds;
    Cylindrical contact homology of links of simple singularities;
    Cabling of knots in overtwisted contact manifolds
  • October 15, 2021 == Umberto Hryniewicz, RWTH Aachen
    Results on abundance of global surfaces of section
  • October 22, 2021 == Yaniv Ganor, Technion
    Big fiber theorems and ideal-valued measures in symplectic topology
  • October 29, 2021 == Yakov Eliashberg, Stanford
    Detecting non-trivial elements in the spaces of Legendrian knots via Algebraic K-theory
  • November 5, 2021 == Rohil Prasad, Princeton; Alex Pieloch, Columbia; Jimmy Chow, CUHK
    The smooth closing lemma for area-preserving surface diffeomorphisms;
    Sections and unirulings of families over the projective line;
    Hofer geometry of coadjoint orbits and Peterson's theorem
  • November 19, 2021 == Fabio Gironella, HU Berlin
    Exact orbifold fillings of contact manifolds
  • November 26, 2021 == Mohammed Abouzaid, Columbia
    Complex cobordism and Hamiltonian fibrations
  • December 10, 2021 == Urs Frauenfelder, Augsburg
    GIT quotients and symplectic data analysis
  • December 17, 2021 == Wenyuan Li, Northwestern; Jakob Hedicke, Bochum; Johan Asplund, Uppsala
    Estimating Reeb chords using microlocal sheaf theory;
    Lorentzian distance functions on the group of contactomorphisms;
    Simplicial descent for Chekanov-Eliashberg dg-algebras
  • January 14, 2022 == Michael Sullivan, UMass Amherst
    Quantitative Legendrian geometry
  • January 21, 2022 == Susan Tolman, UIUC
    Beyond semitoric
  • January 28, 2022 == Dustin Connery-Grigg, UdeM; Pazit Haim-Kislev, Tel Aviv; Thibaut Mazuir, Paris
    Geometry and topology of Hamiltonian Floer complexes in low-dimension;
    Symplectic capacities of p-products;
    Higher algebra of A-infinity algebras in Morse theory
  • February 11, 2022 == Ely Kerman, UIUC
    On symplectic capacities and their blind spots
  • February 18, 2022 == Umut Varolgunes, Boğaziçi
    TBA
  • February 25, 2022 == Erman Cineli, Paris
    TBA
  • March 4, 2022 == Marie-Claude Arnaud, Paris
    TBA

Geometric Analysis Seminar - Organized by Pengfei Guan, Valentino Tosatti, Jérôme Vétois

The seminar is held on Wednesdays at 9:30 on Zoom

Working Group in Low-dimensional Topology - Organized by Tyrone Ghaswala

The working group is held on Mondays at 3:00 PM in PK-5675, UQAM

Working Group in Algebraic and Differential Geometry - Organized by Nathan Grieve, Steven Lu and Julien Keller

The working group is held on Thursdays at 12:30 PM in PK-5675, UQAM

  • December 9, 2021 == Steven Lu, UQAM
    On the moduli of elliptic curves
  • December 16, 2021 == Xuankien Phung, UQAM
    On Parshin-Arakelov theorem and uniformity of integral sections on elliptic surfaces
  • January 20, 2022 == Ruiran Sun, McGill
    An introduction to non-abelian Hodge theory
  • January 27, 2022 == Xia Xiao, UQAM
    Siu's invariance of plurigenera
  • February 2, 2022 == Ariyan Javanpeykar, Johannes Gutenberg Universität
    On Shafarevich's theorem
  • February 10, 2022 == Michael Albanese, UQAM
    Almost Complex Structures on Four-Manifolds
  • February 17, 2022 == Houari Benammar, UQAM
    An introduction to the notion of singular hermitian metric and positivity
    of the direct image of twisted relative canonical bundle
  • March 10, 2022 == Nathan Grieve, RMC, Carleton
    About Fourier transform techniques for derived categories and Chow rings of Abelian varieties
  • March 1, 2022 == Behrouz Taji, UNSW Sydney
    Shafarevich conjecture; Hodge theory meets birational geometry and moduli
  • March 24, 2022 == Frédéric Rochon, UQAM
    On Donaldson's theorem describing the moduli space of SU(2) monopoles on R3
  • March 31, 2022 == Dan Popovici, Toulouse
    Two Notions of Hyperbolicity For Compact Complex Manifolds in Complex Codimension One