The RTG Colloquium takes place in room SRZ 216/217. It starts at 4:00 pm (sharp) with an introductury talk for PhD students and postdocs follwed by a coffee break in the Cluster Lounge. At 5:00 (sharp) the Colloquium talk will begin.
Our next colloquiums will take place as follows:
22 April 2026: Perla Sousi
20 May 2026: Marek Biskup
17 June 2026: Giovanni Peccati
8 July 2026: tba
We are glad to announce the Opening Colloquium of the RTG 3027 "Complex Random Systems" which will be given by Prof. Dr. Antoine Gloria (Sorbonne Université & Université Libre de Bruxelles)
on Wednesday, 29 October 2025, at 5 p.m. (sharp) in SRZ 216/217.
Effective ellipticity for high contrast homogenization
Abstract: Homogenization is the art of averaging coefficients of differential operators in a consistent way. It is the mathematical theory associated with composite materials. The theory is by-now well-understood for linear elliptic equations with random coefficients that are uniformly bounded and elliptic. For applications to mathematical physics and to more contemporary homogenization problems, it is however desirable to move away from uniform ellipticity. In this colloquium I will introduce a concept of effective ellipticity field and ellipticity radius, which quantifies how and at which scale an elliptic operator with (degenerate and unbounded) stationary ergodic coefficients is close to a uniformly elliptic operator. Combined with nonlinear concentration of measure, this allows to extend quantitative homogenization theory to the setting of high- (and even infinite-) contrast.
Detailed programme of the event:
