The upcoming talk
At the next session of the TCS,
on the 18th of February 2026,
at 02:15 – 4:00 p.m. CET / 3:15 – 5:15 p.m. EET
Cristian Andres Ortiz Gonzalez
(IME-USP, São Paulo)
shall talk about
“Morita equivalence of Lie groupoids“.
Abstract
In this talk, we will discuss the notion of Morita equivalence of Lie groupoids and their invariants. First, we will recall the basics on Morita equivalence of Lie groupoids, including several examples. Then we will pay special attention to recent developments around Morita equivalence of Lie groupoids and their underlying stacks.
(All seminar talks are given on the online zoom platform. Unless requested otherwise by the speaker or required by the circumstances, and then specifically indicated in the announcement, the talks consist of two halves, 45 minutes each, separated by a 15-minute break. The web link for every session is circulated via the TCS mailing list. In order to be enlisted, please contact the Organisers.)
Calendar 2025/2026
| Date | Speaker (affiliation) | Title (with a link to the slides, whenever available) |
| October 15th, 2025 | Athanasios Chatzistavrakidis (Ruđer Bošković Institute, Zagreb) | Basic curvature tensors in geometry and physics |
| October 29th, 2025 | Martha Valentina Guarín Escudero (Charles University, Faculty of Mathematics and Physics, Prague) | Fedosov connections and L∞-algebras associated to dg-manifolds |
| November 12th, 2025 | Marcin Piątek (Instytut Fizyki, Uniwersytet Szczeciński) | Geometric Foundations of Celestial Amplitudes |
| December 3rd, 2025 | Jakub R. Filipek (WFUW, Warszawa) | Twisted Abelian Differential Cohomology and Weakly Abelian Lie Groups |
| December 17th, 2025 | Rafał R. Suszek (KMMF, WFUW) | Stacky Dynamics in the Shadows of Principaloid Bundles |
| January 13th, 2026 | Nikita Nekrasov (SCGP, Stony Brook, New York) | Geometry of relativistic hydrodynamics I |
| January 14th, 2026 | Nikita Nekrasov (SCGP, Stony Brook, New York) | Geometry of relativistic hydrodynamics II |
| February 18th, 2026 | Cristian Ortiz (IME-USP, São Paulo) | Morita equivalence of Lie groupoids |
| February 25th, 2026 | Mikołaj Korzyński (CFT PAN) | TBA |
| March 11th, 2026 | ||
| March 25th, 2026 | ||
| April 1st, 2026 | Gaëtan Borot (Institut für Mathematik, Humboldt-Universität zu Berlin) | Large N expansions for random partitions via Nekrasov equations |
| April 8th, 2026 | ||
| April 22nd, 2026 | ||
| May 6th, 2026 | ||
| May 20th, 2026 | ||
| June 3rd, 2026 | ||