Geometry and Topology Seminar
The Geometry and Topology Seminar meets on Wednesday
afternoons at 4:30 pm on Zoom.
For more information about the seminar, contact
Max Forester.
Fall 2020
September 30
4:30 PM (CT) Zoom 
Hoang Thanh Nguyen
Peking University  Subgroup distortion of 3manifold groups 
November 4
4:30 PM (CT) Zoom 
Ricardo Mendes
University of Oklahoma  Pinched 4manifolds 
December 9
4:30 PM (CT) Zoom 

Spring 2020
January 22
4:00 PM (CT) PHSC 809 
Jing Tao
University of Oklahoma  Shape of the Thurston norm ball 
January 29
4:00 PM (CT) PHSC 809 
Jorge Lauret
Universidad Nacional de Córdoba, Argentina  The beta operator of a homogeneous space revisited 
February 12
4:00 PM (CT) PHSC 809 
Hung C. Tran
University of Oklahoma  Divergence of finitely presented groups 
February 19
4:00 PM (CT) PHSC 809 
Emily Stark
University of Utah  Action rigidity for free products of hyperbolic manifold groups 
February 26
4:00 PM (CT) PHSC 809 
Ricardo Mendes
University of Oklahoma  The isometry group of spherical quotients 
March 4
4:00 PM (CT) PHSC 313 
Lawrence Mouillé
University of California, Riverside  Positive intermediate Ricci curvature with torus symmetries 
March 11
4:00 PM (CT) PHSC 809 
Derrick Wigglesworth
University of Arkansas  Algorithmic Detection of Geometric Automorphisms of Free Groups 
April 8
4:00 PM (CT) Zoom 
Dustin Gaskins
University of Oklahoma  Einstein Homogeneous Spaces 
April 15
4:00 PM (CT) Zoom 
Jordan Danser
University of Oklahoma  Filiform Ricci Solitons 
April 22
4:00 PM (CT) Zoom 
Mary Cook
Arizona State University  The holonomy group under the Ricci flow 
Show semesters preceding Spring 2020
Fall 2019
August 28
4:00 PM (CT) PHSC 809 
Hung C. Tran
University of Oklahoma  The local to global property for Morse quasigeodesics 
September 4
4:00 PM (CT) PHSC 809 
Leonard Rubin
University of Oklahoma  Dimension Theory, Extension Theory, and a ProductSuspension Result 
September 11
4:00 PM (CT) PHSC 809 
Jing Tao
University of Oklahoma  A tale of two metrics 
September 25
4:00 PM (CT) PHSC 809 
Ricardo Mendes
University of Oklahoma  Convex Algebraic Geometry of Riemannian Curvature Operators 
October 2
4:00 PM (CT) PHSC 809 
Christopher Cashen
University of Vienna  Cogrowth for group actions with strongly contracting elements 
October 23
4:00 PM (CT) PHSC 809 
Boris Apanasov
University of Oklahoma  "Siamese twins construction" in Teichmüller space of hyperbolic 3manifolds 
November 6
4:00 PM (CT) PHSC 809 
Leonard R. Rubin
University of Oklahoma  Extension Theory: A Product\Suspension Theorem 
Spring 2019
March 6
3:45 PM PHSC 809 
Thomas Lane
University of Oklahoma  Ricci Flow on Homogeneous Spaces 
March 13
3:45 PM PHSC 809 
Jason DeVito
University of Oklahoma  Even dimensional rational homology spheres admitting double disk bundle decompositions are homeomorphic to spheres 
April 3
3:45 PM PHSC 809 
Justin Malestein
University of Oklahoma  Some Linear Representations of the Automorphism Group of a RightAngled Artin Group 
Fall 2018
September 5
3:45 PM PHSC 809 
Leonard R. Rubin
University of Oklahoma  Countable extension dimension 
September 19
3:45 PM PHSC 809 
Jason DeVito
University of Oklahoma and UT Martin  Rational spheres admitting a double disc bundle decomposition 
October 3
4:00 PM PHSC 809 
Miguel Domínguez
ICMAT, Madrid  On isoparametric hypersurfaces in noncompact symmetric spaces 
October 31
3:45 PM PHSC 809 
Andrew Lutz
University of Oklahoma  Almost Isotropic Kähler Manifolds 
November 14
3:45 PM PHSC 809 
Cory Wilson
University of Oklahoma  Totally Geodesic Orbits of Isometries 
December 5
3:45 PM PHSC 809 
Andy Miller
University of Oklahoma  Right angled Coxeter groups and Diophantine quadratic forms 
Spring 2018
January 24
3:45 PM PHSC 809 
Jing Tao
University of Oklahoma  Effective quasimorphisms on rightangled Artin groups 
January 31
3:45 PM PHSC 809 
Max Forester
University of Oklahoma  Genus bounds in rightangled Artin groups 
February 14
4:00 PM PHSC 809 
David E. Rowe
Mainz University  Max Dehn and Helmut Kneser in 1929  or  What went wrong with Dehn's Lemma? 
March 7
3:45 PM PHSC 809 
Paul Plummer
University of Oklahoma  NielsonThurston classification and combinatorial train tracks 
March 28
4:00 PM PHSC 809 
Martin Kerin
University of Muenster  Double disk bundle decompositions and rational ellipticity 
April 4
3:45 PM PHSC 809 
Greg Muller
University of Oklahoma  Skein algebras and marked surfaces 
April 11
4:00 PM PHSC 809 
Robert Kropholler
Tufts University  Almost finitely presented subgroups of hyperbolic groups 
April 18
4:00 PM PHSC 1105 
Mehmet Aktas
University of Central Oklahoma  The Study of Dessins d'Enfants as an Invariant of Trigonal Curves 
April 25
4:00 PM PHSC 809 
Andy Eisenberg
Oklahoma State University  A Characterization of Plain Groups via Rewriting Systems 
May 2
3:45 PM PHSC 809 
Jing Tao
University of Oklahoma  Fine geometry of the Thurston metric 
May 9
4:00 PM PHSC 809 
Jason DeVito
University of Tennessee at Martin  Almost positive curvature on an irreducible symmetric space of rank 2 
Fall 2017
August 23
4:00 PM PHSC 809 
Ricardo Mendes
University of Cologne  Sectional curvature and the Weitzenböck formula 
August 30
3:45 PM PHSC 809 
Michael Jablonski
University of Oklahoma  Blending theorems of Lie and Nash 
September 6
3:45 PM PHSC 809 
Shihshu Walter Wei
University of Oklahoma  From geodesics to Fharmonic maps 
September 13
3:45 PM PHSC 809 
Lee Kennard
University of Oklahoma  Representations of tori and an application in Riemannian geometry 
September 20
3:45 PM PHSC 809 
Lee Kennard
University of Oklahoma  Representations of tori and an application in Riemannian geometry, II 
October 5
12:00 PM PHSC 1105 
Dave Auckly
Kansas State University  One is stabilization is enough for isotopy of surfaces 
October 11
3:45 PM PHSC 809 
Pengfei Zhang
University of Oklahoma  Generic geodesic flow on S^2 
October 18
4:00 PM PHSC 809 
Brett Kotschwar
Arizona State University  A uniqueness theorem for asymptotically cylindrical shrinking Ricci solitons 
October 25
4:00 PM PHSC 809 
Neil Hoffman
Oklahoma State University  Determining cohyperbolicity of 3manifolds 
November 1
4:00 PM PHSC 809 
Yingbo Han
Xinyang Normal University and OU  On the CR PoincaréLelong equation, Yamabe steady solitons and structures of complete noncompact Sasakian manifolds 
November 8
4:00 PM PHSC 809 
Owen Dearricott
University of Melbourne  Positive curvature in dimension 7 
November 17
3:30 PM PHSC 809 
Matt Clay
University of Arkansas  Thermodynamic metrics on outer space 
November 29
4:00 PM PHSC 809 
Edgar Bering
Temple University  A McCarthytype theorem for linearly growing outer automorphisms of a free group 
Spring 2017
January 25
3:45 PM PHSC 809 
Lee Kennard
University of Oklahoma  Topological realization problems 
February 1
4:00 PM PHSC 809 
Carolyn Gordon
Darthmouth College  Decoding geometry and topology from the Steklov spectrum of orbisurfaces 
February 8
3:45 PM PHSC 809 
Jing Tao
University of Oklahoma  Coarse and fine geometry of the Thurston metric 
February 15
3:45 PM PHSC 809 
Justin Malestein
University of Oklahoma  Burnsidelike problems for Aut(Fn) and primitive homology 
February 22
3:45 PM PHSC 809 
Ignat Soroko
University of Oklahoma  Uncountably many quasiisometry classes of groups of type FP 
March 1
4:00 PM PHSC 809 
Andrew Sale
Vanderbilt University  Vastness properties of McCool groups of free groups and automorphisms of RAAGs 
March 8
4:00 PM PHSC 809 
Kenneth Bromberg
University of Utah  Convex cocompact subgroups of the mapping class group 
March 29
3:45 PM PHSC 809 
Thomas Lane
University of Oklahoma  Curvature on Lie Groups 
April 5
3:45 PM PHSC 809 
Anthony Martino
University of Oklahoma  Dunwoody's geometric proof of Stallings Theorem 
April 12
4:00 PM PHSC 809 
Yusheng Wang
Beijing Normal University  Curvature >= 1, diameter >= \pi/2 and rigidity (in Alexandrov geometry) 
April 19
3:45 PM PHSC 809 
Jonathan Merlini
University of Oklahoma  Rank Rigidity on 3Manifolds 
April 26
4:00 PM PHSC 809 
Joseph Maher
CUNY  Random walks on groups with negative curvature 
May 3
3:45 PM PHSC 809 
Elahe Khalili Samani
University of Oklahoma  Topology of 8dimensional positively curved Riemannian manifolds with symmetry 
May 10
4:00 PM PHSC 809 
Tracy Payne
Idaho State University  Evolutionary Game Theory and Applications to Geometry 
Fall 2016
September 7
3:45 PM PHSC 809 
Leonard R. Rubin
University of Oklahoma  New methods for Gacyclic resolutions in cohomological dimension 
September 14
3:45 PM PHSC 809 
Jonathan Epstein
University of Oklahoma  Topological entropy of magnetic flows on nilmanifolds 
September 21
4:00 PM PHSC 809 
Dave Auckly
Kansas State University  Equivariant Homology Cobordism 
September 28
3:45 PM PHSC 809 
Boris Apanasov
University of Oklahoma  Topological barriers for maps, M.A.Lavrentiev problem, and 4cobordisms 
October 5
3:45 PM PHSC 809 
Shihshu Walter Wei
University of Oklahoma  Distance Functions, Hessian, Radial Curvature and Mean Curvature 
October 12
3:45 PM PHSC 809 
Ravi Shankar
University of Oklahoma  New metrics of nonnegative sectional curvature on exotic spheres 
October 19
4:00 PM PHSC 809 
Maria Emilia Descotte
University of Buenos Aires  2Proobject theory 
October 26
4:00 PM PHSC 809 
Wolfgang Ziller
University of Pennsylvania  Graph manifolds, nullity and the Nomizu conjecture 
November 2
4:00 PM PHSC 809 
Dmytro Yeroshkin
Idaho State University  Manifolds with density and measure 
December 7
3:45 PM PHSC 809 
Michael Tilles
University of Oklahoma  Geometry of 2step nilpotent Lie groups 
Spring 2016
February 3
3:45 PM PHSC 809 
Justin Malestein
University of Oklahoma  Arithmetic quotients of the mapping class group from covers 
February 10
3:45 PM PHSC 809 
Ignat Soroko
University of Oklahoma  Dehn functions of subgroups of rightangled Artin groups 
February 17
3:45 PM PHSC 809 
KB Lee
University of Oklahoma  Some infranilmanifolds of dimension 6 
February 24
4:00 PM PHSC 809 
Andrew Putman
Rice University  The highdimensional cohomology of the moduli space of curves with level structures 
March 9
4:00 PM PHSC 809 
Mark Pengitore
Purdue  Effective Separability of Nilpotent Groups 
March 30
4:00 PM PHSC 809 
Richard Webb
University College, London  Locally infinite complexes, combinatorial isoperimetric inequalities and CAT(0) metrics 
April 20
3:45 PM PHSC 809 
Shihshu Walter Wei
University of Oklahoma  The Geometry and Topology of Locally Conformally Flat Manifolds, Quasiconformal and Quasiregular Mappings 
April 27
4:00 PM PHSC 809 
Huy T. Nguyen
University of Oklahoma  Harmonic forms on Kahler manifolds 
May 4
3:45 PM PHSC 809 
Robert Tang
University of Oklahoma  Veech surfaces and simple closed curves 
May 31
3:30 PM PHSC 809 
Ramiro Lafuente
University of Muenster  On a gap theorem for Ricci flatness on homogeneous spaces and its applications 
Fall 2015
September 2
3:45 PM PHSC 809 
Leonard Rubin
University of Oklahoma  Examples of Pseudocompact Spaces and Their Products 
September 9
3:45 PM PHSC 809 
Jeff Meyer
University of Oklahoma  Geodesics and Surfaces: A Rigid Interaction 
September 16
3:45 PM PHSC 809 
Ravi Shankar
University of Oklahoma  Semifree circle actions on 5manifolds 
September 23
3:45 PM PHSC 809 
Max Forester
University of Oklahoma  Effective quasimorphisms for rightangled Artin groups 
September 30
4:00 PM PHSC 809 
Camille Horbez
University of Utah  Subgroups of the automorphism group of a free product 
October 21
3:45 PM PHSC 809 
Max Forester
University of Oklahoma  Quasimorphisms on rightangled Artin groups 
November 11
4:00 PM PHSC 809 
Andrey Vesnin
Russian Academy of Sciences (Sobolev Institute of Mathematics in Novosibirsk)  From rightangled polyhedra to manifolds and links 
November 18
3:45 PM PHSC 1105 
Walter Wei
University of Oklahoma  LawsonSimons Conjecture, Cohomology Algebra, Complex Analysis, and Characteristic Classes 
November 30
3:30pm PHSC 359 
Tommy Murphy
Cal. State University, Fullerton  Complex Riemannian foliations of Hermitian symmetric spaces. 
December 2
3:45 PM PHSC 809 
Ben Stucky
University of Oklahoma  Applications of Graph Folding 
December 9
4:00 PM PHSC 809 
Catherine Searle
Wichita State University  Nonnegative curvature and torus actions 
Spring 2015
January 21
4:00 PM PHSC 809 
Henry Segerman
Oklahoma State University  Pachner moves and crushing normal surfaces 
January 28
3:45 PM PHSC 809 
Jing Tao
University of Oklahoma  Growth Tight Actions 
February 18
4:00 PM PHSC 1105 
Catherine Pfaff
Universität Bielefeld  When Outer Space behaves like Teichmuller space (or hyperbolic spaces) & how we can use this to understand Out(F_n) 
March 25
4:00 PM PHSC 809 
Funda Gultepe
University of Illinois at UrbanaChampaign  Constructing fully irreducible automorphisms of the free group via geometric Dehn twisting 
April 1
4:00 PM PHSC 809 
Thomas Koberda
Yale  Convex cocompactness in rightangled Artin groups 
April 22
4:00 PM PHSC 1105 
Benjamin Linowitz
University of Michigan  Effective rigidity in spectral geometry 
April 29
4:00 PM PHSC 115 
Peter Petersen
UCLA  Uniqueness of Warped Product Einstein Metrics 
Fall 2014
August 20
4:00 PM PHSC 1105 
Lina Wu
BMCC, CUNY  Studying Harmonic Differential Forms by Extending the Scope of L^{q} Growth 
September 3
3:45 PM PHSC 809 
Robert Tang
University of Oklahoma  Shadows of Teichmueller discs in the curve graph 
September 10
3:45 PM PHSC 809 
Garrett Alston
University of Oklahoma  Holomorphic curves in symplectic and contact geometry, I 
September 17
3:45 PM PHSC 809 
Garrett Alston
University of Oklahoma  Holomorphic curves in symplectic and contact geometry, II 
September 24
3:45 PM PHSC 809 
Jing Tao
University of Oklahoma  Uniform growth rate 
October 1
4:00 PM PHSC 809 
Talia Fernós
UNC Greensboro  Rigidity of actions on CAT(0) cube complexes 
October 8
3:45 PM PHSC 809 
Noel Brady
University of Oklahoma  Hyperbolic Hydra 
November 5
3:45 PM PHSC 809 
Chenxu He
University of Oklahoma  Infinitesimal rigidity of gradient steady Ricci soliton in dimension three 
November 12
3:45 PM PHSC 809 
Ignat Soroko
University of Oklahoma  Virtually special freebycyclic groups 
December 3
3:45 PM PHSC 809 
Michael Jablonski
University of Oklahoma  Einstein solvmanifolds have maximal symmetry 
Spring 2014
January 17
3:30 PM PHSC 809 
Dan Knopf
University of Texas at Austin  TypeII singularities of Ricci flow 
January 22
4:00 PM PHSC 809 
John Harvey
University of Notre Dame  Orbifolds and Alexandrov geometry 
January 29
3:45 PM PHSC 809 
Will Wylie
Syracuse University  Sectional Curvature for Riemannian manifolds with density. 
February 5
4:30 PM PHSC 809 
Trent Schirmer
Oklahoma State University  Heegaard splittings, free tangle decompositions, and the fundamental group of knots 
February 12
4:00 PM PHSC 809 
Mark Feighn
Rutgers UniversityNewark  Folding paths in Outer space 
February 19
3:45 PM PHSC 809 
Max Forester
University of Oklahoma  Trees and stable commutator length 
February 25
4:00 PM PHSC 1105 
Vera Tonic
Ben Gurion University  Introduction to asymptotic dimension theory for discrete groups 
March 26
3:45 PM PHSC 809 
Michael Jablonski
University of Oklahoma  A step towards the Alekseevskii Conjecture. 
April 2
4:00 PM PHSC 809 
Danielle O'Donnol
Oklahoma State University  Legendrian Graphs 
April 9
4:00 PM PHSC 809 
Sean Bowman
Oklahoma State University  Knots in the page of an open book 
April 23
3:45 PM PHSC 809 
Scott Thuong
University of Oklahoma  All FourDimensional InfraSolvmanifolds are Boundaries 
April 30
3:45 PM PHSC 809 
Ignat Soroko
University of Oklahoma  A new linearity criterion of BouRabee and McReynolds 
Fall 2013
August 28
3:45 PM PHSC 809 
Jeffrey Meyer
University of Oklahoma  A Geometric Introduction to Arithmetic Groups 
September 4
3:45 PM PHSC 809 
Jeffrey Meyer
University of Oklahoma  An Introduction to Spectral Geometry of Arithmetic Locally Symmetric Spaces (a.k.a  A Geometric Introduction to Arithmetic Groups  Part II) 
September 11
3:45 PM PHSC 1105 
Shihshu Walter Wei
University of Oklahoma  New Comparison Theorems and Cohomology Groups 
September 18
3:45 PM PHSC 809 
Matthew Lynam
University of Oklahoma  Extensional Maps 
October 2
3:45 PM PHSC 809 
Ravi Shankar
University of Oklahoma  Rigidity of spherical rank for a lower curvature bound 
October 9
3:45 PM PHSC 809 
Michael Jablonski
University of Oklahoma  An equivalence of conjectures 
October 16
3:45 PM PHSC 809 
Michael Jablonski
University of Oklahoma  An equivalence of conjectures, part II 
October 23
3:45 PM PHSC 809 
Chenxu He
University of Oklahoma  Linear stability of gradient shrinking Ricci solitons 
October 30
3:45 PM PHSC 809 
Joel Louwsma
University of Oklahoma  Stable commutator length in BaumslagSolitar groups 
November 6
3:45 PM PHSC 809 
Noel Brady
University of Oklahoma  Homotopical and homological Dehn functions are different 
November 13
3:45 PM PHSC 809 
Chenxu He
University of Oklahoma  Linear stability of gradient shrinking Ricci solitons, II 
November 20
3:45 PM PHSC 809 
Leonard Rubin
University of Oklahoma  The Topology of Direct Limits of Direct Systems Induced by Maps 
December 4
4:00 PM PHSC 809 
Sam Taylor
The University of Texas at Austin  Subfactor projections and fully irreducible automorphisms of free groups 
Spring 2013
January 23
3:45 PM PHSC 809 
Murad Ozaydin
University of Oklahoma  Topological Robotics  Restricted Configuration Spaces 
January 30
3:45 PM PHSC 809 
Murad Ozaydin
University of Oklahoma  Topological Robotics  Restricted Configuration Spaces II 
February 6
3:45 PM PHSC 809 
Shihshu Walter Wei
University of Oklahoma  A generalized Bochner's method and its applications in real and complex geometry and topology 
February 13
3:45 PM PHSC 809 
Shihshu Walter Wei
University of Oklahoma  A generalized Bochner's method and its applications in real and complex geometry and topology II 
March 6
3:45 PM PHSC 809 
Chenxu He
University of Oklahoma  Riemannian manifolds with positive or nonnegative sectional curvature 
April 17
3:45 PM PHSC 809 
Jing Tao
University of Oklahoma  The shape of moduli space 
May 1
3:45 PM PHSC 1105 
Yoe Herrera
University of Oklahoma  Intersection Numbers in a Surface 
Fall 2012
September 12
4:00 PM PHSC 809 
Lee Kennard
UC Santa Barbara  Two conjectures of Hopf in the presence of symmetry 
September 19
3:45 PM PHSC 809 
Chenxu He
University of Oklahoma  Existence and uniqueness of Einstein metrics on warped products 
September 26
3:45 PM PHSC 809 
Jing Tao
University of Oklahoma  Thurston metric on Teichmuller space 
October 17
3:45 PM PHSC 809 
Jean Sun
University of Oklahoma  Growth, Projections and Bounded Generation of Mapping Class Groups 
October 24
3:45 PM PHSC 809 
Michael Jablonski
University of Oklahoma  How to build an isometry group. 
October 31
3:45 PM PHSC 809 
William Carter
University of Oklahoma  Nice Examples of NonUnique Product Groups 
November 7
3:45 PM PHSC 809 
Leonard Rubin
University of Oklahoma  Simplified Proofs of the Z/p and Qresolution Theorems 
November 27
3:45 PM PHSC 809 
 
November 28
4:00 PM PHSC 809 
Spencer Dowdall
University of Illinois at UrbanaChampaign  Kleinian convex cocompact subgroups of mapping class groups 
December 5
3:45 PM PHSC 809 
Rachel Wright
University of Oklahoma  Rightangled Artin groups as totally reflected systems 