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Geometry & Topology Seminar Archive

Past Seminars




Nov 15/18 Spiro Karigiannis,  University of Waterloo A curious system of second order nonlinear PDEs for U(m)-structures on manifolds
Oct 25/18 Mehmetcik Pamuk, McMaster University Arbitrarily large factorizations in mapping class groups
Nikolai Saveliev, University of Miami On the Frøyshov invariant and monopole Lefschetz number
Oct 18/18 Elizabeth Drellich, Swarthmore College   tba
Oct 4/18 Jesse Madnick
McMaster University
Sept 13/18 Tyrone Ghaswala
McMaster University
Amalgamated free products of circularly ordered groups
Apr 27/18 Rita Gitik
University of Michigan
A new algorithm in group theory
Apr 12/18 Elise Villella
University of Pittsburgh
Virtual Gelfand-Zetlin polytopes
Apr 5/18 Yulan Qing
University of Toronto
Loops with large twist get short along quasi-geodesics in 
Mar 29/18 Andreas Arvanitoyeorgos
University of Patras
Homogeneous geodesics and two-step homogeneous geodesics in homogeneous spaces
Mar 22/18 Patrick Naylor
University of Waterloo
Surface bundles over surfaces
Mar 22/18 Erik Pedersen (University of Copenhagen): Controlled algebra and topological data analysis
Mar 8/18 Giulio Tiozzo (University of Toronto): Counting loxodromic elements
Feb 15/18 Kasia Jankiewicz
McGill University
Cubical dimension of small cancellation groups
Feb 1/18 ???
McMaster University
Perelman’s functionals on compact manifolds with isolated conical singularities
Jan 25/18 Matthias Nagel
McMaster University
Surface systems and triple linking numbers
Jan 4/18 Dave Auckly
Kansas State University
Stable equivalence of smoothly knotted surfaces
Dec 7/17 Tyrone Ghaswala
University of Waterloo
Coverings, groupoids, and embedding braids in mapping class groups
Nov 30/17 David Duncan
McMaster University
Some open problems in gauge theory, symplectic geometry, and low-dimensional topology
Nov 23/17 Christopher Davis
University of Wisconsin at Eau Claire
Concordance of knots in homology spheres and the solvable filtration
Nov 17/17 Nikolai Saveliev
University of Miami
On gauge theoretic invariants of homology S1×S3
Nov 9/17 Katherine Raoux
Michigan State University
Nov 2/17 Anja Randecker
University of Toronto
On Loch Ness monsters and wild singularities – a Halloween-inspired introduction to infinite translation surfaces
Oct 26/17 Jonathan Hillman
University of Sydney
Complements of closed hypersurfaces in S4
Oct 19/17 Matthias Nagel
McMaster University
Concordance and the Gordon-Litherland lattice
Oct 12/17 George Dragomir
McMaster University
Metric transforms yielding Gromov hyperbolic spaces
Oct 2/17 Klaus Kröncke
University of Hamburg
Stability of ALE Ricci-flat manifolds under Ricci-flow
Sept 21/17 Hari Kunduri
Memorial University of Newfoundland
Geometric inequalities for black hole initial data sets
Sept 14/17 Steven Boyer
Département de mathématiques
Université du Québec à Montréal
Branched Covers of Quasipositive Links and L-Spaces
April 6/17 McKenzie Wang
Math & Stats Dept
McMaster University
Some examples of ancient solutions to the Ricci flow
Mar 23/17 Panagiotis Giannioti
Regularity theory for Type I  Ricci flows
Mar 30/17 Hans Boden
McMaster University
Slice obstructions for virtual knots
Mar 16/17 Nima Anvari
Math & Stats Dept
McMaster University
Equivariant Rho-Invariants and Instanton Homology of Torus Knots
Mar 9/17 Gary Kennedy
Ohio State
Topicalizing spherical varieties
Mar 2/17 Larry Siebenmann Analyzing surface flows using trees and the Bendixson-Mather 2-disk
Feb 23/17 Chris Herald
University of Nevada, Reno
Obtaining reduced Khovanov homology from traceless character varieties
Feb 16/17 Megumi Harada
McMaster University
Newton-Okounkov bodies and integrable systems
Feb 9/17 Balazs Elek
Pizzas and Kazhdan-Lusztig atlases on toric surfaces
 Feb 2/17 Tyrone Ghaswala
Mapping class groups, coverings, braids and groupoids
Jan 25/17 Victor Mouquin
University of Toronto
One some holomorphic Poisson structures related to geometric representation theory
Jan 19/17 Ali Aleyasin The Calabi problem on edge-cone manifolds
Jan 12/17 Cagatay Kutluhan
University of Buffalo
Filtering the Heegaard Floer contact invariant 
Jan 5/17 George Dragomir
McMaster University
On the existence of closed geodesics on compact developable orbifolds
Nov 18/16 Steffen Marcus
College of New JerseySjuvon Chung
Rutgers University
Fans of logarithmic structures
(Joint with Algebra Seminar)
Euler characteristics of cominuscule quantum $K$-theory
Nov 11/16 Doug Schultz
Rutgers University
Lagrangian Floer theory in symplectic fibrations
Nov 4/16 Changliang Wang
McMaster University
Stability of Riemannian manifolds with Killing spinors
Oct 21/16 Kristen Hendricks
Michigan State University
Involutive Heegaard Floer homology
Sept 30/16 Alex Kuronya
Budapest Univ. of Tech & Econ.Geoff Scott
University of Toronto
Positivity of line bundles and equations defining projective varieties

Lie Algebroids on Pinched S^1 Bundles

Oct 7/16 Maxime Fortier Bourque
University of Toronto
The Teichmuller space of conformal pentagons
Sept 23/16 Naoki Fujita
Tokyo Institute of Technology
Newton-Okounkov polytopes of Schubert varieties and folding method
Sept 16/16 Akos Nagy
University of Waterloo
The Berry connection of the Ginzburg–Landau vortices
Mar 10/16 Grigorios Fournodavlos
University of Toronto
Singular Ricci solitons and their stability under the Ricci flow
Mar 3/16 Matthias Nagel
Minimal genus in circle bundles over 3-manifolds
Feb 25/16 Hiraku Abe
McMaster University
The cohomology of Hessenberg varieties and representations of symmetric groups
Feb 4/16 Iva Halacheva
University of Toronto
The Gromov width of coadjoint orbits of the symplectic group
Jan 14/16 David Rosenthal
St. John’s
Large scale geometry of groups
Nov 26/15 Peter Crooks
University of Toronto
Minimal nilpotent Hessenberg varieties
Nov 20/15 Martha Precup
The Betti numbers of parabolic Hessenberg varieties
Nov 12/15 Long Li
McMaster Universilty
On conic constant scalar curvature Kaehler(cscK) metrics 
Nov 5/15 John Shareshian
Washington St. Louis
Applying discrete Morse theory to complexes of graphs
Oct 29/15 Alejandro Betancourt de la Parra
Cohomogeneity one Ricci solitons
Oct 22/15 Tatsuya Horiguchi
McMaster University
The equivariant cohomology rings of regular nilpotent Hessenberg varieties in Lie type A
Oct 8/15 Federico Galetto
McMaster University
Tangent schemes of determinantal varieties
Oct 1/15 David Duncan
McMaster University
On the critical values of the Chern-Simons functional 
Sept 24/15 Jeremy Lane
University of Toronto
Convexity and the Thimm Trick 
Sept 17/15 Elisheva Adina Gamse
Vanishing relations in the cohomology of the moduli space of parabolic bundles
Sept 10/15 Alexander Caviedes Castro
Tel Aviv
Idempotents and symmetries on QH(G(k, n)) 
Sept 3/15 Chris Cornwell
Understanding character varieties of knot complements and 2-fold branched covers through the cord ring
May 20/15 Ergun Yalcin
Bilkent University
Group actions on spheres with rank one isotropy
May 19/15 Robert Oliver
University of Paris 13
Automorphisms of p-completed classifying spaces
May 19/15 Sune Precht Reeh
Massachusetts Institute of Technology
Characteristic idempotents and fusion systems
Apr 9/15 Chris Herald
University of Nevada, Reno
A Lagrangian-Floer theory in the pillowcase arising from traceless representations of knot groups
Mar 19/15 Laurent Siebenmann
Chambers and trees describing general foliations of the plane
Mar 12/15 Ergun Yalcin
McMaster University
Rank Threee p-Group Actions on Products of Spheres
Feb 26/15 Long Li
McMaster University
On the convexity of the Mabuchi energy functional along geodesics
Feb 12/15 Steven Gindi
University of Waterloo
Holomorphic Twistor Spaces and Bihermitian Geometry
Feb 5/15 Jihyeon Jessie Yang
McMaster University
Toric desingularization of Gelfand-Zetlin toric variety
Jan 29/15 Matt Luther
McMaster University
Continuous Model Theory and Flat Subspaces
Jan 22/15 Cynthia Curtis
The College of New Jersey
The SL(2,C) Casson invariant for knots and the A-hat polynomial
Jan 15/15 Alyson Hildum
McMaster University
Topological 4-manifolds with RAAG fundamental groups
Dec 18/14 Andreas Arvaniteorgeous
University of Patras & Tufts University
Progress on homogeneous Einstein manifolds
Dec 4/14 Ronald Fintushel
Michigan State University
Pinwheels and fake projective planes
Nov 27/14 Thomas Murphy
California State Fullerton
Complex Riemannian foliations of Kaehler manifolds
Nov 20/14 Romina Arroyo
University of Cordoba, Argentina
Homogeneous Ricci solitons and the Alekseevskii conjecture in low dimensions
Nov 13/14 Eric Harper
McMaster University
Virtual knots, almost classical knots, and their Alexander lnvariants
Nov 6/14 Alejandro Adem
University of British Columbia
Homotopy Group Actions and Group Cohomology
Oct 30/14 Oleg Chterental
University of Toronto
Virtual Braids and Virtual Curve Diagrams
Oct 23/14 Shuguang Wang
University of Missouri
A compactification of the foliated ASD moduli spaces
Oct 16/14 Nikolai Saveliev
University of Miami
Instanton knot homology and equivariant gauge theory
Oct 2/14 Nima Anvari
McMaster University
Cyclic Group Actions on Contractible Four-Manifolds
Sep 25/14 Ergun Yalcin
Bilkent University
Constructing finite group actions on homotopy spheres
Sep 18/14 Long Li
McMaster University
Apr 3/14 Shahab Kalantari
Amirkabir University of Technology
Asymptotic Resemblance: A new approach to define a large scale structure on a set
Mar 27/14 Peng Lu
University of Oregon
Shrinking Ricci solitons
Mar 20/14 Blake Winter
University of Buffalo
Welded Knots and Ribbon Knots
Mar 13/14 Eric Harper
McMaster University
The Virtual Knot Group and its Alexander Invariants
Mar 6/14 Thomas Murphy
McMaster University
Spectral geometry of toric Einstein manifolds
Jan 30/14 Dror Bar-Natan
University of Toronto
Trees and Wheels and Balloons and Hoops
Jan 16/14 Laurent Siebenmann
Vignettes from the rise of differential topology
Dec 5/13 Diarmuid Crowley
Max Planck Institute, Bonn
The topology of Stein fillable contact manifolds in higher dimensions
Nov 28/13 Chris Cappadocia
McMaster University
The weak hyperbolic dimension of metric spaces
Nov 14/13 Thomas Murphy
McMaster University
Rigidity results for Hermitian-Einstein manifolds
Nov 7/13 Yun-xia Chen
University of Waterloo
ADE bundles over complex surfaces
Oct 31/13 Alyson Hildum
McMaster University
The minimum b_2 problem for right-angled Artin groups
Oct 17/13 Frederick  Fong
Brown University
Kahler-Ricci flow and its singularity analysis
Oct 10/13 Enxin Wu
Western University
A homotopy theory for diffeological spaces
Oct 3/13 Karene Chu
Massachusetts Institute of Technology
Classification of flat virtual pure tangles
Sep 19/13 Anna Bertiger
University of Waterloo
The action of Sp(n) on complex flags
Sep 12/13 Bruce Williams
University of Notre Dame
Localizations and algebraic K-theory


Apr 25/13 Masoud Khakhali
University of Western Ontario
Spectral zeta functions, scalar curvature, and Gauss-Bonnet theorems in noncommutative geometry
Apr 4/13 Nima Anvari
McMaster University
Equivariant gauge theory and four-manifolds
Mar 28/13 Reto Mueller
Imperial College, London
Dynamical stability and instability of Ricci-flat metrics
Mar 21/13 Saso Strle
University of Ljubljana
Unknotting number and concordance
Mar 14/13 Alexander Kolpakov
Vanderbilt University
Geometric and combinatorial optimality of the hyperbolic 24-cell
Mar 7/13 Robert Haslhofer
Quantitative stratification and the regularity of mean curvature flow
Feb 28/13 Mikhail Mazin
Topology and combinatorics of certain compactified Jacobians
Feb 14/13 David Duncan
Rutgers University
A compactness result for the quilted Atiyah–Floer conjecture
Feb 7/13 Eric Harper
McMaster University
Akbulut corks and non-trivial involutions on instanton Floer homology
Jan 31/13 Peter Samuelson
University of Toronto
Skein modules and the double affine Hecke algebra
Jan 24/13 Tomoo Matsumura
Korea Advanced Institute of Science and Technology (KAIST)
Schubert calculus of weighted Grassmannians
Jan 17/13 Maria Buzano
McMaster University
Ricci flow on homogeneous spaces
Jan 10/13 Aaron Smith
University of Waterloo
The higher Riemann–Hilbert correspondence and extensions
Nov 29/12 Ruxandra Moraru
University of Waterloo
Stable bundles on complex nilmanifolds
Nov 22/12 David Rosenthal
St. John’s University
On the coarse asymptotic dimension of groups
Nov 15/12 William Wylie
Syracuse University
Warped product rigidity
Nov 8/12 Daniel Ruberman
Brandeis University
Embeddings of non-orientable surfaces in 4-manifolds
Nov 1/12 Jihyeon Jessie Yang
McMaster University
“Limits” of schemes
Oct 25/12 Kate Petersen
Florida State University
The Euclidean algorithm and primitive roots
Oct 11/12 Shintaro Kuroki
University of Toronto
Root systems of torus graphs and characterization of extended actions of torus manifolds
Oct 4/12 Adam Clay
Left-orderability, foliations, L-spaces and graph manifolds
Sep 20/12 Kristin Shaw
University of Toronto
Obstructions to approximating tropical curves in surfaces
Sep 13/12 Owen Baker
McMaster University
Hyperbolic group boundaries and Cannon-Thurston maps