Upcoming Events

Tuesday, 16.06.2026, 10:15 (WIAS-406)

Seminar Nichtlineare Optimierung und Inverse Probleme
Prof. Dr. Stefan Metzger, Friedrich-Alexander-Universität Erlangen-Nürnberg:
On the numerical treatment of the stochastic Cahn-Hilliard equation with double-obstacle potential
more ... Location
Weierstraß-Institut, Anton-Wilhelm-Amo-Str. 39, 10117 Berlin, 4. Etage, Weierstraß-Hörsaal (Raum: 406)

Abstract
The Cahn-Hilliard equation is a deterministic model for the description of phase separation processes in metal alloys, which occur if the alloy is rapidly cooled below a critical temperature. This equation can be interpreted as a gradient flow of the Ginzburg-Landau energy functional, which consists of a gradient term and double-well potential favoring phase separation. If the quench is shallow, i.e. the temperature is still close to the critical temperature, the double-well potential can be approximated by a smooth fourth-order polynomial. Yet, in the deep quench limit, i.e. when the temperature is significantly smaller than the critical temperature, a singular double-obstacle potential is the better choice. It is also well-known that in particular the early stages of the separation process are heavily influenced by thermal fluctuations which are not included in the deterministic description. In this talk, we discuss the numerical treatment of the stochastic Cahn-Hilliard equation with double-obstacle potential and conservative noise on a periodic domain. In particular, we propose a fully discrete finite element scheme and present a convergence result. Conceptually, our proof relies on monotonicity arguments and omits the application of Skorokhod's theorem, which allows us to show convergence towards probabilistically strong solutions. We conclude by presenting numerical simulations underlining the practicality of the proposed scheme and the importance of the additional stochastic fluxes.

The talk is based on a joint work with Lubomir Banas (Bielefeld University).

Host
WIAS Berlin

Tuesday, 16.06.2026, 15:00 (WIAS-405-406)

Seminar Modern Methods in Applied Stochastics and Nonparametric Statistics
Jakob Kellermann, WIAS Berlin:
Signature kernel ridge regression
more ... Location
Weierstraß-Institut, Anton-Wilhelm-Amo-Str. 39, 10117 Berlin, 4. Etage, Raum: 405/406

Further Informations
Dieser Vortrag findet auch via Zoom statt: https://wias-berlin-de.zoom-x.de/j/69982487566

Host
WIAS Berlin

Wednesday, 17.06.2026, 10:00 (WIAS-ESH)

Forschungsseminar Mathematische Statistik
Dr. Anna Calissano, University College London, GB:
Statistical analysis of spatial graphs
more ... Location
Weierstraß-Institut, Anton-Wilhelm-Amo-Str. 39, 10117 Berlin, Erdgeschoss, Erhard-Schmidt-Hörsaal

Abstract
A spatial graph is a specific type of graph with spatial attributes associated with the nodes and the edges. It is a smart modelling choice for capturing the skeleton of a shape, a blood vessel network, a porous tissue, and many other data objects with intrinsically complex geometry. In this talk, we describe how spatial graphs can be analysed using a specific metric (the Fused Gromov-Wasserstein metric). We extend a testing procedure between distributions of spatial graphs, a depth measure to describe the distribution of spatial graphs, and a dimensionality reduction procedure based on preserving key topological features. We present this variety of methods on a dataset of cardiac fibrosis tissue and on a dataset of fungus mycelium networks.

Further Informations
Dieser Vortrag findet auch via Zoom statt: https://hu-berlin.zoom-x.de/j/65177102181?pwd=nUMtJOkzDx8xyWzPFezeHh0NEIQUv3.1, Meeting-ID 651 7710 2181, Kenncode: 536200

Host
Humboldt-Universität zu Berlin
Universität Potsdam
WIAS Berlin

Friday, 26.06.2026, 10:15 (WIAS-406)

Seminar Nichtlineare Optimierung und Inverse Probleme
Prof. Dr. Nils-Otto Kitterød, Norwegian University of Life Sciences:
Modelling erosion and sediment transport -- Challenges and opportunities
more ... Location
Weierstraß-Institut, Anton-Wilhelm-Amo-Str. 39, 10117 Berlin, 4. Etage, Weierstraß-Hörsaal (Raum: 406)

Host
WIAS Berlin

Tuesday, 30.06.2026, 10:00 (WIAS-406)

Seminar Modern Methods in Applied Stochastics and Nonparametric Statistics
Dr. Oleg Butkovsky, WIAS Berlin:
Will there still be mathematicians in 1 year? A personal experience from the "The First Proof" project
more ... Location
Weierstraß-Institut, Anton-Wilhelm-Amo-Str. 39, 10117 Berlin, 4. Etage, Weierstraß-Hörsaal (Raum: 406)

Further Informations
Dieser Vortrag findet auch via Zoom statt: https://wias-berlin-de.zoom-x.de/j/69982487566

Host
WIAS Berlin

July 6 – 8, 2026 (WIAS-ESH)

Workshop/Konferenz: Spreading Dynamics in Random Environment
more ... Location
Weierstraß-Institut, Anton-Wilhelm-Amo-Str. 39, 10117 Berlin, Erdgeschoss, Erhard-Schmidt-Hörsaal

Host
WIAS Berlin

September 7 – 11, 2026 (HUB main building)

Workshop/Konferenz: 17th International Conference on Free Boundary Problems: Theory and Applications 2026
more ... Location
Humboldt Universität zu Berlin, Unter den Linden 6, 10117 Berlin

Host
Humboldt-Universität zu Berlin
WIAS Berlin

November 3 – 6, 2026 (WIAS-ESH)

Workshop/Konferenz: Stochastic processes with reinforcement
more ... Location
Weierstraß-Institut, Anton-Wilhelm-Amo-Str. 39, 10117 Berlin, Erdgeschoss, Erhard-Schmidt-Hörsaal

Host
WIAS Berlin