# Archive of Events

Past events and news of the Graduiertenkolleg 1821 in Freiburg

- Summer 2020: Basic Notions Seminar (SR318 ("Kasparov"), from May 14, 2020 02:15 PM to Jul 16, 2020 03:15 PM)
- Introductory talks to various topics in and around our research areas given by PhD students and postdocs. Advisors are not allowed, to encourage more so-called stupid questions.
- Lecture Series "Triangulated categories of motivic sheaves", 25-28 February 2020, Universität Freiburg (SR 404, Ernst-Zermelo-Str.1, from Feb 25, 2020 10:15 AM to Feb 28, 2020 11:45 AM)
- Cohomology theories in algebraic geometry do not come alone, but with associated "sheaf theories" and a rich functoriality with respect to morphisms of schemes ("six operation formalism"). The archetypal example is the theory of étale and l-adic sheaves developed in SGA4-5, which has been adapted to many other settings (analytic sheaves, D-modules, etc.) Thanks to the work of Voevodsky and his successors, we now have a theory of triangulated categories of étale motivic sheaves which generalises the theory of étale sheaves and is, in some sense, the universal such (triangulated) sheaf theory. Surprisingly, morphism groups in these categories are related to algebraic cycles. In this course, I will first explain the construction of these categories and develop their functoriality. I will then describe some of the related conjectures which promise tannakian insights into the structure of algebraic cycles, and I will end with the particular case of 1-motivic sheaves, coming from relative curves, where everything is well-understood.
- Summer School "Special Holonomy – Geometry and Physics", September 23 – 27, 2019, Freiburg (HS II, SR 404, 403, from Sep 23, 2019 09:00 AM to Sep 27, 2019 04:00 PM)
- Sommer School "o-Minimal Structures in Algebraic Geometry", September 9-13, 2019 Freiburg (HS II, SR 404, 403, 125, from Sep 09, 2019 09:00 AM to Sep 13, 2019 04:00 PM)
- Originating in model theory, o-minimality is a tameness property of real sets which enjoys important finiteness properties. O-minimal structures have recently found a number of important applications to algebraic and arithmetic geometry. The aim of this summer school is to provide an introduction to these ideas for an audience of non-experts.
- Darmstadt-Erlangen-Freiburg Seminar on Conformal Field theory, Friday, July 5, 2019 Institut für Mathematik Albert-Ludwigs-Universität Freiburg (room 404 of the Mathematics Institute (Ernst-Zermelo-Strasse 1, fourth floor), from Jul 05, 2019 02:00 PM to Jul 05, 2019 06:00 PM)
- Lecture Series "Hypoelliptic laplacian and applications", 20-24 May 2019, Universität Freiburg (SR 414, Ernst-Zermelo Str.1, from May 20, 2019 09:30 AM to May 24, 2019 12:00 AM)
- The purpose of the lectures is to give an introduction to the hypoelliptic Laplacian and to the results which have been obtained so far by this method. The hypoelliptic Laplacian gives a universal interpolation between the Laplacian and the generator of the geodesic flow through a family of hypoelliptic operators acting on a bigger space than the original Laplacian. There are as many hypoelliptic Laplacians as there are Laplacians. To this deformation of operators corresponds an interpolation of dynamics, that interpolates between Brownian motion, with the most irregular paths possible, and the geodesics which have the most regular trajectories. Explicit geometric formulas for certain orbital integrals will appear as consequences. These give in arbitrary dimensions the analogues of the geometric formula obtained by Selberg in the case of Riemann surfaces. The lectures are given by Jean-Michel Bismut. Additionally, he will give a Colloquium talk for the general audience.
- Fourth Meeting for Young Women in Mathematics “Cohomological Methods in Geometry” (Room 404, Ernst-Zermelo Str.1, from May 01, 2019 05:00 PM to May 03, 2019 03:00 PM)
- We are hosting a meeting for young women in mathematics at the University of Freiburg as part of our program "Cohomological Methods in Geometry".
- Algebraic and Geometric Aspects in Quantum Field Theory 16-18 April 2019, Universität Freiburg (SR 404, Ernst-Zermelo Str.1, from Apr 16, 2019 08:30 AM to Apr 18, 2019 02:15 PM)
- The aim of the meeting is to bring together mathematicians working on Quantum Field Theory from different perspectives through the talks by some of the most known and active international researchers. This event represents an important occasion to review recent achievements and to start fruitful discussions on the open issues and on the directions of future research.
- Third Meeting for Young Women in Mathematics, February 12-14, 2017 (Room 404, Eckerstraße 1, HS II , from Feb 12, 2017 05:00 PM to Feb 14, 2017 03:00 PM)
- Winter 2016/17: Basic Notions Seminar (SR414, from Oct 24, 2016 10:00 AM to Feb 08, 2017 12:00 AM)
- Introductory talks given by PhD students and Postdocs; advisors are not allowed, to encourage more stupid questions.
- Summer School "Coarse Index Theory", September 26-30, 2016 (from Sep 26, 2016 09:00 AM to Sep 30, 2016 08:00 PM)
- Summer 2016: Codimension 2 (404, from Apr 18, 2016 02:00 PM to Jul 23, 2016 04:00 PM)
- Lecture Series on Geometric Complexity Theory, March 14-18, 2016 (SR 404, Eckerstr. 1, from Mar 14, 2016 10:00 AM to Mar 18, 2016 12:00 PM)
- Jesko Hüttenhain from TU Berlin will give an introduction to the field of geometric/algebraic complexity theory, an approach to solve problems in theoretical computer science by studying actions of linear groups on algebraic varieties.
- Lecture Series on Transgression and Flows, March 1-10, 2016 (SR125, from Mar 01, 2016 10:15 AM to Mar 10, 2016 12:00 PM)
- Lectures Series by Prof. Daniel Cibotaru (Fortaleza, Brazil)
- Blockseminar of the Graduiertenkolleg 2016 (Oberharmersbach, from Feb 24, 2016 11:00 AM to Feb 26, 2016 03:00 PM)
- Winter 15/16: K3 Surfaces (404, from Oct 19, 2015 02:00 PM to Feb 13, 2016 04:00 PM)
- Lecture Series on Deformation Theory, January 12-27, 2016 (SR 318, SR 414, from Jan 12, 2016 10:15 AM to Jan 27, 2016 12:00 PM)
- Six lectures on Deformation Theory by Peter Dalakov (Sofia)
- Summer School "Manifolds and K-Theory", July 27-31 2015 (from Jul 27, 2015 09:00 AM to Jul 31, 2015 03:00 PM)
- Summer 2015: Basic Notions Seminar (SR 119, Eckerstr. 1, from Apr 20, 2015 10:00 AM to Jul 24, 2015 12:00 AM)
- Introductory talks given by PhD students and Postdocs; advisors are not allowed, to encourage more stupid questions.
- Summer 2015: Sheaf Cohomology (404, from Apr 22, 2015 02:10 AM to Jul 22, 2015 10:10 AM)