Geometry and Topology Seminar 2019-2020: Difference between revisions
| Line 115: | Line 115: | ||
===Ben Knudsen (Northwestern)=== | ===Ben Knudsen (Northwestern)=== | ||
Rational homology of configuration spaces via factorization homology | ''Rational homology of configuration spaces via factorization homology'' | ||
The study of configuration spaces is particularly tractable over a field of characteristic zero, and much effort has gone into producing chain complexes simple enough for explicit computations, formulas for Betti numbers, and homological stability results. I will discuss recent work identifying the homology of the configuration spaces of an arbitrary manifold M with the homology of a certain Lie algebra constructed from the compactly supported cohomology of M. The aforementioned results follow immediately from this identification, albeit with hypotheses removed; in particular, one obtains a new, elementary proof of homological stability for configuration spaces. | The study of configuration spaces is particularly tractable over a field of characteristic zero, and much effort has gone into producing chain complexes simple enough for explicit computations, formulas for Betti numbers, and homological stability results. I will discuss recent work identifying the homology of the configuration spaces of an arbitrary manifold M with the homology of a certain Lie algebra constructed from the compactly supported cohomology of M. The aforementioned results follow immediately from this identification, albeit with hypotheses removed; in particular, one obtains a new, elementary proof of homological stability for configuration spaces. | ||
Revision as of 02:36, 18 September 2014
The Geometry and Topology seminar meets in room 901 of Van Vleck Hall on Fridays from 1:20pm - 2:10pm.
For more information, contact Richard Kent.
Fall 2014
| date | speaker | title | host(s) |
|---|---|---|---|
| August 29 | Yuanqi Wang | Liouville theorem for complex Monge-Ampere equations with conic singularities. | Wang |
| September 5 | |||
| September 12 | Chris Davis (UW-Eau Claire) | L2 signatures and an example of Cochran-Harvey-Leidy | Maxim |
| September 19 | Ben Knudsen (Northwestern) | TBA | Ellenberg |
| September 26 | |||
| October 3 | Kevin Whyte (UIC) | Quasi-isometric embeddings of symmetric spaces | Dymarz |
| October 10 | Alden Walker (UChicago) | Transfers of quasimorphisms | Dymarz |
| October 17 | |||
| October 24 | |||
| October 31 | Jing Tao (Oklahoma) | TBA | Kent |
| November 1 | Young Geometric Group Theory in the Midwest Workshop | ||
| November 7 | Thomas Barthelmé (Penn State) | TBA | Kent |
| November 14 | |||
| November 21 | |||
| Thanksgiving Recess | |||
| December 5 | |||
| December 12 | |||
Fall Abstracts
Yuanqi Wang
Liouville theorem for complex Monge-Ampere equations with conic singularities.
Following Calabi, Pogorelov, Evans-Krylov-Safanov, and Trudinger's pioneer work on interior regularities and liouville theorems for Monge-Ampere equations, we prove the Liouville theorem for conic Kähler-Ricci flat metrics. We also discuss various applications of this Liouville theorem to conic Kähler geometry.
Chris Davis (UW-Eau Claire)
L2 signatures and an example of Cochran-Harvey-Leidy
Ben Knudsen (Northwestern)
Rational homology of configuration spaces via factorization homology
The study of configuration spaces is particularly tractable over a field of characteristic zero, and much effort has gone into producing chain complexes simple enough for explicit computations, formulas for Betti numbers, and homological stability results. I will discuss recent work identifying the homology of the configuration spaces of an arbitrary manifold M with the homology of a certain Lie algebra constructed from the compactly supported cohomology of M. The aforementioned results follow immediately from this identification, albeit with hypotheses removed; in particular, one obtains a new, elementary proof of homological stability for configuration spaces.
Kevin Whyte (UIC)
TBA
Alden Walker (UChicago)
Rotation quasimorphisms on free groups coming from hyperbolic surface realizations are a particularly nice class of quasimorphisms. I'll describe a transfer construction which lifts rotation quasimorphisms from finite index subgroups, and I'll give an infinite family of examples of group chains for which this construction produces an extremal quasimorphism. Though dynamics and geometry underlie this construction, my talk will be primary combinatorial and should be accessible to anyone at all familiar with geometric group theory. This is joint work with Danny Calegari.
Jing Tao (Oklahoma)
TBA
Thomas Barthelmé (Penn State)
TBA
Spring 2015
| date | speaker | title | host(s) |
|---|---|---|---|
| January 23 | |||
| January 30 | |||
| February 6 | |||
| February 13 | |||
| February 20 | |||
| February 27 | |||
| March 6 | |||
| March 13 | |||
| March 20 | |||
| March 27 | |||
| Spring Break | |||
| April 10 | |||
| April 17 | |||
| April 24 | |||
| May 1 | |||
| May 8 |
Spring Abstracts
Archive of past Geometry seminars
2013-2014: Geometry_and_Topology_Seminar_2013-2014
2012-2013: Geometry_and_Topology_Seminar_2012-2013
2011-2012: Geometry_and_Topology_Seminar_2011-2012
2010: Fall-2010-Geometry-Topology