Upcoming Talks

In Spring 2026, the UChicago Algebraic Topology Seminar will meet on Tuesdays at 4:00-5:00PM in Eckhart Hall 206 and will be preceded by a pretalk 3:30-4PM (unless otherwise noted).

To receive emails about the seminar, please email Nikolai Konovalov requesting to be subscribed to our mailing list.

• • Apr 142026

  Gijs Heuts (Utrecht University)

  Periodic homotopy theory of spaces and Hopf algebras

  I will discuss two ways of thinking about the homotopy theory of spaces ''at height $n$'', namely $v_n$-periodic and $T(n)$-local homotopy theory, as well as the relation between the two. There are different ways to understand these localizations using notions from higher algebra, namely spectral Lie algebras and commutative ring spectra. I’ll try to explain how spectral Hopf algebras can serve as a unifying perspective.

• • Apr 212026

  Florian Reidel (University of Copenhagen)

• • Apr 282026

  Christian Kremer (MPIM)

  The Nielsen Realisation Problem for high--dimensional aspherical manifolds

  The classical Nielsen Realisation Problem asks whether a finite subgroup of the mapping class group of a surface can be realised by an actual group action on the surface. It was answered affirmatively by Kerckhoff. In my talk, I will present a generalisation of this problem to high-dimensional aspherical manifolds, and discuss results for group actions of cyclic groups of prime order, based on the newly developed technique of equivariant and isovariant Poincaré duality.

• • May 052026

  Kenny Schefers (UC Berkeley)

• • May 122026

  Piotr Pstrągowski (University of Washington)

• • May 192026

  Kirill Magidson (Northwestern University)

If you have any questions, please contact Sanath Devalapurkar, Nikolai Konovalov, Akhil Mathew, Tomer Schlank, or Peter May.