Veranstaltungen
- Dienstag, 16.06.2026, 10:15 Uhr (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
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Weierstraß-Institut, Anton-Wilhelm-Amo-Str. 39, 10117 Berlin, 4. Etage, Weierstraß-Hörsaal (Raum: 406)
Abstrakt
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).
Veranstalter
WIAS Berlin - Dienstag, 16.06.2026, 15:00 Uhr (WIAS-405-406)
- Seminar Modern Methods in Applied Stochastics and Nonparametric Statistics
Jakob Kellermann, WIAS Berlin:
Signature kernel ridge regression
mehr ... Veranstaltungsort
Weierstraß-Institut, Anton-Wilhelm-Amo-Str. 39, 10117 Berlin, 4. Etage, Raum: 405/406
Weitere Informationen
Dieser Vortrag findet auch via Zoom statt: https://wias-berlin-de.zoom-x.de/j/69982487566
Veranstalter
WIAS Berlin
- Mittwoch, 17.06.2026, 10:00 Uhr (WIAS-ESH)
- Forschungsseminar Mathematische Statistik
Dr. Anna Calissano, University College London, GB:
Statistical analysis of spatial graphs
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Weierstraß-Institut, Anton-Wilhelm-Amo-Str. 39, 10117 Berlin, Erdgeschoss, Erhard-Schmidt-Hörsaal
Abstrakt
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.
Weitere Informationen
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
Veranstalter
Humboldt-Universität zu Berlin
Universität Potsdam
WIAS Berlin
- Freitag, 26.06.2026, 10:15 Uhr (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
mehr ... Veranstaltungsort
Weierstraß-Institut, Anton-Wilhelm-Amo-Str. 39, 10117 Berlin, 4. Etage, Weierstraß-Hörsaal (Raum: 406)
Veranstalter
WIAS Berlin
- Dienstag, 30.06.2026, 10:00 Uhr (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
mehr ... Veranstaltungsort
Weierstraß-Institut, Anton-Wilhelm-Amo-Str. 39, 10117 Berlin, 4. Etage, Weierstraß-Hörsaal (Raum: 406)
Weitere Informationen
Dieser Vortrag findet auch via Zoom statt: https://wias-berlin-de.zoom-x.de/j/69982487566
Veranstalter
WIAS Berlin
- 6. – 8. Juli 2026 (WIAS-ESH)
- Workshop/Konferenz: Spreading Dynamics in Random Environment
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Weierstraß-Institut, Anton-Wilhelm-Amo-Str. 39, 10117 Berlin, Erdgeschoss, Erhard-Schmidt-Hörsaal
Veranstalter
WIAS Berlin
- 7. – 11. September 2026 (HUB main building)
- Workshop/Konferenz: 17th International Conference on Free Boundary Problems: Theory and Applications 2026
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Humboldt Universität zu Berlin, Unter den Linden 6, 10117 Berlin
Veranstalter
Humboldt-Universität zu Berlin
WIAS Berlin
- 3. – 6. November 2026 (WIAS-ESH)
- Workshop/Konferenz: Stochastic processes with reinforcement
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Weierstraß-Institut, Anton-Wilhelm-Amo-Str. 39, 10117 Berlin, Erdgeschoss, Erhard-Schmidt-Hörsaal
Veranstalter
WIAS Berlin
