Working group: tt-geometry, WS 2020/21 and WS 2021/22

Time and place: Thursday afternoon in T2-228 or as indicated

Organisers: Prof. Dr. Henning Krause, Dr. Juan Omar Gomez

This is the schedule for a small working group between researchers from Bielefeld University and University of Paderborn during the winter semester 2023/24. The goal of this semester is to understand the recent classification of thick tensor ideals in the derived category of permutation modules of a finite group over a field of positive characteristic. A more detailed program will apper soon. Previous sessions were organized by Dr. Marc Stephan, more information can be found here.

Schedule for WS 2020/21

  • 18 Nov, 16:00
    • Eike Lau: Balmer spectrum
  • 18 Nov, 17:00
    • Janina Letz: Theorem of Hopkins-Neeman
  • 2 Dec, 16:00
    • Fabian Januszewski: Harish-Chandra modules
  • 6 Jan, 17:00 via Zoom
    • Fabian Januszewski: Monoidal structures on Harish-Chandra modules
  • 13 Jan, 17:00 via Zoom
    • Marc Stephan: Stratification of triangulated categories
  • 27 Jan, 17:00 via Zoom
    • Henning Krause: Stratification of representations of finite groups
  • 10 Feb, 17:00 via Zoom
    • Tobias Columbus: A^1 over monoidal derivators
  • 24 Feb, 17:00 via Zoom
    • Marc Stephan: Perfect chain complexes with small homology over F_2[A_4]
  • 10 Mar, 17:00 via Zoom
    • Discussion about research problems

Schedule for WS 2021/22

  • 28 Oct, 16:00 in U2-217
    • Janina Letz: The frame of alpha-localizing ideals and its connection to the tt-spectrum via Stone duality
  • 8 Nov, 16:00 in V4-112
    • Henning Krause: The stable derived category of a noetherian scheme
  • 8 Nov, 17:00 in V4-112
    • Marc Stephan: Finite permutation resolutions
  • 9 Dec, 17:30 in V2-200
    • Eike Lau: Permutation modules and cohomological singularity
  • 20 Dec, 16:00 in V4-112
    • Tobias Columbus: Artin Motives I
  • 20 Dec, 17:00 in V4-112
    • Fabian Januszewski: Artin Motives II

Schedule for SS 2022

  • 26 Apr, 17:00 in H6
    • Tobias Columbus: Some aspect of permutation modules, Mackey functors and Artin motives
  • 19 May, 16:00 in H11
    • Rudradip Biswas: On the Noetherianness and connectedness of Balmer spectra of stable module categories of infinite groups
  • 19 May, 17:00 in H11
    • Janina Letz: The spectrum of a well-generated tensor triangulated category
  • 24 May, 16:00 in T2-149
    • Henning Krause: Fibrewise stratification of group representations

Schedule for WS 2023/24

  • 11 Oct, 14:15 in U2-200
    • Organisational meeting
  • 18 Oct, 16:00 in U2-200
    • Henning Krause: Permutation resolutions for representations of finite groups (after Rouquier)
  • 26 Oct, 16:00 in V2-213
    • Juan Omar Gomez: Modular fix points
  • 2 Nov, 16:00 in T2-228
    • Eike Lau: Primes in the derived category of permutation modules
  • 30 Nov, 16:00 in T2-228
    • Alexander Samokhin: Twisted cohomology
  • 14 Dec, 16:00 in T2-228