Veranstaltungen
- Dienstag, 19.05.2026, 15:00 Uhr (WIAS-406)
- Seminar Modern Methods in Applied Stochastics and Nonparametric Statistics
Sorelle Toukam, WIAS Berlin:
Stochastic maximum principle for McKean-Vlasov SDEs with rough drift coefficients
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Weierstraß-Institut, Anton-Wilhelm-Amo-Str. 39, 10117 Berlin, 4. Etage, Weierstraß-Hörsaal (Raum: 406)
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Dieser Vortrag findet auch via Zoom statt: https://wias-berlin-de.zoom-x.de/j/69982487566
Veranstalter
WIAS Berlin
- Mittwoch, 20.05.2026, 10:00 Uhr (WIAS-ESH)
- Forschungsseminar Mathematische Statistik
Prof. Dr. Johannes Schmidt-Hieber, University of Twente, Niederlande:
A new neural network architecture for learning convex functions
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Weierstraß-Institut, Anton-Wilhelm-Amo-Str. 39, 10117 Berlin, Erdgeschoss, Erhard-Schmidt-Hörsaal
Abstrakt
For small covariate dimension, shape constrained inference is a well-established topic within nonparametric statistics. For large covariate dimensions, one naturally wants to introduce machine learning based methods. Input convex neural networks (ICNNs) were designed as a network architecture to learn convex functions. In this talk, we introduce Hyper Input Convex Neural Networks (HyCNNs). HyCNNs combine the principles of Maxout networks with ICNNs to create a neural network that is always convex in the input, theoretically capable of leveraging depth, and performs reliable when trained at scale compared to ICNNs. Concretely, we prove that HyCNNs require exponentially fewer parameters than ICNNs to approximate quadratic functions up to a given precision. Throughout a series of synthetic experiments, we demonstrate that HyCNNs outperform existing ICNNs and MLPs in terms of predictive performance for convex regression and interpolation tasks. WWe further apply HyCNNs to learn high-dimensional optimal transport maps for synthetic examples and for single-cell RNA sequencing data, where they oftentimes outperform ICNN-based neural optimal transport methods and other baselines across a wide range of settings. For more details, see arxiv.org/pdf/2604.26942. This is joint work with Shayan Hundrieser and Insung Kong
Weitere Informationen
Dieser Vortrag findet auch via Zoom statt: https://wias-berlin-de.zoom-x.de/j/69982487566
Veranstalter
Humboldt-Universität zu Berlin
Universität Potsdam
WIAS Berlin
- Mittwoch, 20.05.2026, 11:30 Uhr (WIAS-406)
- Seminar Interacting Random Systems
Julian Kern, FU Berlin:
tba
mehr ... Veranstaltungsort
Weierstraß-Institut, Anton-Wilhelm-Amo-Str. 39, 10117 Berlin, 4. Etage, Weierstraß-Hörsaal (Raum: 406)
Abstrakt
tba
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Seminar Interacting Random Systems (Hybrid Event)
Veranstalter
WIAS Berlin
- Mittwoch, 20.05.2026, 14:15 Uhr (WIAS-ESH)
- Berliner Oberseminar „Nichtlineare partielle Differentialgleichungen” (Langenbach-Seminar)
Prof. Dr. Riccarda Rossi, University of Brescia, Italien:
BV curves of measures
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Weierstraß-Institut, Anton-Wilhelm-Amo-Str. 39, 10117 Berlin, Erdgeschoss, Erhard-Schmidt-Hörsaal
Abstrakt
Representation results for absolutely continuous curves with values in the Wasserstein space of Borel probability measures in ℝd with finite p-moment, p > 1, provide a crucial tool to study evolutionary PDEs in a measure-theoretic setting. They are strictly related to the superposition principle for measure-valued solutions to the continuity equation. This talk revolves around the extension of these results to the case p = 1, and to curves that are only of bounded variation in time. Based on a joint collaboration with Stefano Almi (Napoli) and Giuseppe Savaré (Milano).
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Berliner Oberseminar “Nichtlineare partielle Differentialgleichungen” (Langenbach-Seminar)
Veranstalter
Humboldt-Universität zu Berlin
WIAS Berlin
- Donnerstag, 21.05.2026, 10:30 Uhr (WIAS-Library)
- Software and Data Seminar
Laura Prieto Saavedra, WIAS Berlin:
Introduction to ParaView
mehr ... Veranstaltungsort
Weierstraß-Institut, Hausvogteiplatz 5-7, 10117 Berlin, R411
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Seminar Software and Data
Veranstalter
WIAS Berlin
- Mittwoch, 27.05.2026, 11:30 Uhr (WIAS-406)
- Seminar Interacting Random Systems
David Dereudre, University of Lille:
Rigidity of Riesz gases
mehr ... Veranstaltungsort
Weierstraß-Institut, Anton-Wilhelm-Amo-Str. 39, 10117 Berlin, 4. Etage, Weierstraß-Hörsaal (Raum: 406)
Abstrakt
In this talk, we will survey the rigidity of Riesz gases, which are equilibrium states (or Gibbs measures) in $mathbbR^d$ of continuum particle systems subjected to the Riesz potential. Here, rigidity refers to hyperuniformity, number rigidity, or symmetry breaking (such as crystallization or cyclic factor property). Several results will be presented, along with a number of conjectures.
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Seminar Interactin Random Systems
Veranstalter
WIAS Berlin
- Mittwoch, 27.05.2026, 14:15 Uhr (WIAS-ESH)
- Berliner Oberseminar „Nichtlineare partielle Differentialgleichungen” (Langenbach-Seminar)
Prof. Dr. Tomáš Roubíček, Czech Academy of Sciences, Tschechische Republik:
The Stefan problem with a phase transition between visco-elastic fluids and finitely-strained solids
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Weierstraß-Institut, Anton-Wilhelm-Amo-Str. 39, 10117 Berlin, Erdgeschoss, Erhard-Schmidt-Hörsaal
Abstrakt
The compressible fluid-solid interaction (FSI) with a thermomechanical phase transition is formulated at large strains in the Eulerian frame. The Jeffreys (also called anti-Zener) rheology in the deviatoric part with an additional viscosity is used. The main philosophy for the mechanical solid-liquid transition is that the viscous (or viscoplastic) response depends on temperature and may completely degenerate towards a viscoelastic fluid during thawing, which then allows for free flow of the fluid and its freezing in a new configuration and possibly again subsequent melting towards the fluid unlimitedly repeating such cycles. The classical Stefan problem related with the latent heat of the 1st-order (i.e. here thawing-freezing) phase transition is augmented by involving kinetic overheating and undercooling. The (sketched) analysis by a time discretization with a suitable truncation is applied to a higher-gradient modification of the original problem, i.e. involving the concept of multipolar nonsimple material. Some enhancements of the basic model as phase-field fracture in the solid phase or a diffusant dependency (like a salinity variation within the sea water/ice transition or a nickel content variation within the Earth inner/outer core transition) will be outlined, too.
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Oberseminar “Nichtlineare partielle Differentialgleichungen” (Langenbach-Seminar)
Veranstalter
Humboldt-Universität zu Berlin
WIAS Berlin
- Donnerstag, 28.05.2026, 10:30 Uhr (WIAS-Library)
- Software and Data Seminar
Nikolas Tapia:
Introduction to Lean
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Weierstraß-Institut, Hausvogteiplatz 5-7, 10117 Berlin, R411
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Software and Data Seminar
Veranstalter
WIAS Berlin
- 1. – 5. Juni 2026 (WIAS-ESH)
- Workshop/Konferenz: ESGI 194 - The Berlin Study Group with Industry
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Weierstraß-Institut, Anton-Wilhelm-Amo-Str. 39, 10117 Berlin, Erdgeschoss, Erhard-Schmidt-Hörsaal
Veranstalter
WIAS Berlin
- Donnerstag, 11.06.2026, 14:00 Uhr (WIAS-ESH)
- Seminar Materialmodellierung
Prof. Dr. Dieter Bothe, Technische Universität Darmstadt:
Sharp interface modelling fundamentals for two-phase fluid systems
mehr ... Veranstaltungsort
Weierstraß-Institut, Anton-Wilhelm-Amo-Str. 39, 10117 Berlin, Erdgeschoss, Erhard-Schmidt-Hörsaal
Abstrakt
The sharp interface framework enables a thermodynamically consistent description of two-phase fluid systems, representing interfaces as moving hypersurfaces separating bulk phases. Starting from classical balance laws for mass and momentum, the local kinematics of two-phase flows with phase change and interfacial slip is addressed. Since the associated kinematic differential equation may exhibit non-uniqueness, the notion of co-moving sets must first be consolidated in order to establish a two-phase Reynolds transport theorem. On this basis, balance laws and jump conditions for multicomponent two-phase fluid systems are formulated, consistently coupling bulk and interfacial dynamics. Building on the Gibbsian concept of interfaces as autonomous lower-dimensional thermodynamic subsystems, extensions with interfacial mass are introduced, enabling full thermodynamic coupling with the adjacent bulk phases and thereby promoting the interface to an interphase. Finally, extensions to multi-velocity and multi-temperature formulations are outlined.
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
- 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
