Veranstaltungen

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21. – 24. Mai 2024 (ZIB-SEM)

Workshop/Konferenz: QUANTUM OPTIMAL CONTROL From Mathematical Foundations to Quantum Technologies
mehr ... Veranstaltungsort
Zuse-Zentrum für Informationstechnik (ZIB), Takustr. 7, 14195 Berlin, Seminarraum

Abstrakt
This workshop is part of the Thematic Einstein Semester “Mathematics for Quantum Technologies” (Summer 2024) funded by the Cluster of Excellence MATH+ and the Einstein Foundation Berlin. A central objective of the workshop is to promote an exchange between mathematicians, physicists and engineers across disciplines on the subject of optimal control of quantum systems.

Veranstalter
Freie Universität Berlin
WIAS Berlin
Technische Universität Berlin
Zuse Institute Berlin

Dienstag, 21.05.2024, 09:30 Uhr (WIAS-406)

Continuation methods
WIAS workshop: Working with continuation methods
mehr ... Veranstaltungsort
Weierstraß-Institut, Mohrenstr. 39, 10117 Berlin, 4. Etage, Weierstraß-Hörsaal (Raum: 406)

Abstrakt
The aim of this WIAS workshop is to explore applications and mathematical research topics at WIAS that utilize or further develop continuation methods, particularly in the context of stationary solutions of dynamical systems. This involves the inversion of parameter-dependent nonlinear problems emerging from ODEs, PDEs and delay differential equations. Key aspects of the meeting will include showcasing mathematical research questions, identifying relevant applications, and exploring the development of numerical methods and the use of existing software.

Veranstalter
WIAS Berlin

Dienstag, 21.05.2024, 10:15 Uhr (WIAS-ESH)

Seminar Nichtlineare Optimierung und Inverse Probleme
Dr. Wim van Ackooij, Electricité de France R&D:
A bilevel perspective on optimization with probability constraints
mehr ... Veranstaltungsort
Weierstraß-Institut, Mohrenstr. 39, 10117 Berlin, Erdgeschoss, Erhard-Schmidt-Hörsaal

Abstrakt
In this talk we will discuss optimization problems involving probability constraints and discuss how in some cases these can be reformulated as bilevel optimization problems. We will show, how under some assumption, an exact penalization scheme can then be set up and derive an algorithm for its solution.

Veranstalter
WIAS Berlin

Dienstag, 21.05.2024, 13:30 Uhr (WIAS-ESH)

Seminar Numerische Mathematik
Dr. Christian Merdon:
Pressure-robustness in Navier--Stokes simulations
mehr ... Veranstaltungsort
Weierstraß-Institut, Mohrenstr. 39, 10117 Berlin, Erdgeschoss, Erhard-Schmidt-Hörsaal

Veranstalter
WIAS Berlin

Mittwoch, 22.05.2024, 10:00 Uhr (WIAS-406)

Forschungsseminar Mathematische Statistik
Prof. Dr. Vladimir Spokoiny, WIAS Berlin:
Gaussian variational inference in high dimension
mehr ... Veranstaltungsort
Weierstraß-Institut, Mohrenstr. 39, 10117 Berlin, 4. Etage, Weierstraß-Hörsaal (Raum: 406)

Abstrakt
We consider the problem of approximating a high-dimensional distribution by a Gaussian one by minimizing the Kullback-Leibler divergence. The main result extends Katsevich and Rigollet (2023) and claims that the minimiser can be well approximated by the Gaussian distribution with the mean and variance as for the underlying measure. We also describe the accuracy of approximation and the range of applicability for such approximation in terms of efficient dimension. The obtained results can be used for analysis of various sampling scheme in optimization.

Weitere Informationen
Der Vortrag findet auch via Zoom statt: https://hu-berlin.zoom-x.de/j/69268586742?pwd=bDZJQTk5TGdnUkVCUk9RWGdsWC9vdz09 Meeting-ID: 692 6858 6742, Passwort: 021844

Veranstalter
Humboldt-Universität zu Berlin
Universität Potsdam
WIAS Berlin

Mittwoch, 22.05.2024, 11:30 Uhr (WIAS-405-406)

Seminar Interacting Random Systems
Emmanuel Jacob, ENS Lyon, Frankreich:
tba
mehr ... Veranstaltungsort
Weierstraß-Institut, Mohrenstr. 39, 10117 Berlin, 4. Etage, Raum: 405/406

Weitere Informationen
Seminar Interacting Random Systems (Online Event)

Veranstalter
WIAS Berlin

Mittwoch, 22.05.2024, 14:15 Uhr (WIAS-ESH)

Berliner Oberseminar „Nichtlineare partielle Differentialgleichungen” (Langenbach-Seminar)
Prof. Dr. Jürgen Sprekels, WIAS Berlin:
Necessary and sufficient optimality conditions in the sparse optimal control of singular Allen--Cahn systems with dynamic boundary conditions
mehr ... Veranstaltungsort
Weierstraß-Institut, Mohrenstr. 39, 10117 Berlin, Erdgeschoss, Erhard-Schmidt-Hörsaal

Weitere Informationen
Berliner Oberseminar “Nichtlineare partielle Differentialgleichungen” (Langenbach-Seminar)

Veranstalter
Humboldt-Universität zu Berlin
WIAS Berlin

Donnerstag, 23.05.2024, 14:00 Uhr (WIAS-ESH)

Seminar Numerische Mathematik
Alfonso Caiazzo, WIAS Berlin:
Multiscale modeling of elastic materials & overview of applications in the assimilation of biomedical data
mehr ... Veranstaltungsort
Weierstraß-Institut, Mohrenstr. 39, 10117 Berlin, Erdgeschoss, Erhard-Schmidt-Hörsaal

Abstrakt
The first part of the talk will describe our recent work concerning the modeling of biphasic tissues composed of an elastic matrix (2D or 3D) and fluid inclusions of co-dimension 2 (0D or 1D, respectively). The model is based on a finite element immersed method where the effect of the fluid is accounted via proper singular terms. The dimensionality reduction is achieved using a reduced Lagrange multipliers formulation of the resulting PDE. The second part of the talk is dedicated to an overview of applications (past, present, and upcoming) in quantitative biomedicine focusing on the role of mathematical modeling and scientific computing for data assimilation problems.

Weitere Informationen
Numerical mathematics seminars

Veranstalter
WIAS Berlin

Mittwoch, 29.05.2024, 16:15 Uhr (WIAS-ESH)

Berliner Kolloquium Wahrscheinlichkeitstheorie
Nikolay Barashkov, MPI Leipzig:
tba
mehr ... Veranstaltungsort
Weierstraß-Institut, Mohrenstr. 39, 10117 Berlin, Erdgeschoss, Erhard-Schmidt-Hörsaal

Veranstalter
Humboldt-Universität zu Berlin
Technische Universität Berlin
WIAS Berlin

Mittwoch, 29.05.2024, 17:15 Uhr (WIAS-ESH)

Berliner Kolloquium Wahrscheinlichkeitstheorie
Shige Peng, Shandong University:
tba
mehr ... Veranstaltungsort
Weierstraß-Institut, Mohrenstr. 39, 10117 Berlin, Erdgeschoss, Erhard-Schmidt-Hörsaal

Veranstalter
Humboldt-Universität zu Berlin
Technische Universität Berlin
WIAS Berlin

Dienstag, 04.06.2024, 10:15 Uhr (WIAS-406)

Seminar Nichtlineare Optimierung und Inverse Probleme
Dr. Łukasz Płociniczak, Wrocław University of Science and Technology, Polen:
From hydrology, through climatology to hemo- and lymphodynamics: Mathematical modelling approaches
mehr ... Veranstaltungsort
Weierstraß-Institut, Mohrenstr. 39, 10117 Berlin, 4. Etage, Weierstraß-Hörsaal (Raum: 406)

Veranstalter
WIAS Berlin

Dienstag, 04.06.2024, 14:30 Uhr (WIAS-ESH)

Seminar Numerische Mathematik
Daniel Runge:
Mass-conservative reduced basis approach for heterogeneous catalysis
mehr ... Veranstaltungsort
Weierstraß-Institut, Mohrenstr. 39, 10117 Berlin, Erdgeschoss, Erhard-Schmidt-Hörsaal

Veranstalter
WIAS Berlin

Mittwoch, 05.06.2024, 11:30 Uhr (WIAS-405-406)

Seminar Interacting Random Systems
Gerónimo Uribe Bravo, Universidad Nacional Autónoma de México, Mexiko:
tba
mehr ... Veranstaltungsort
Weierstraß-Institut, Mohrenstr. 39, 10117 Berlin, 4. Etage, Raum: 405/406

Weitere Informationen
Seminar Interacting Random Systems (Hybrid Event)

Veranstalter
WIAS Berlin

Mittwoch, 12.06.2024, 16:15 Uhr (WIAS-ESH)

Berliner Kolloquium Wahrscheinlichkeitstheorie
Eduardo Abi Jaber, Ecole Polytechnique:
tba
mehr ... Veranstaltungsort
Weierstraß-Institut, Mohrenstr. 39, 10117 Berlin, Erdgeschoss, Erhard-Schmidt-Hörsaal

Veranstalter
Humboldt-Universität zu Berlin
Technische Universität Berlin
WIAS Berlin

Mittwoch, 26.06.2024, 09:00 Uhr (TUB HE101)

MATh.en.JEANS
Schüler:innen-Konferenz: MATh.en.JEANS
mehr ... Veranstaltungsort
Technische Universität, Straße des 17. Juni 136, 10623 Berlin, HE101

Abstrakt
https://wias-berlin.de/people/kern/mejkonferenz24/researchers.jsp

Veranstalter
WIAS Berlin

Mittwoch, 26.06.2024, 16:15 Uhr (WIAS-ESH)

Berliner Kolloquium Wahrscheinlichkeitstheorie
Benjamin Jourdain, École des Ponts ParisTech:
tba
mehr ... Veranstaltungsort
Weierstraß-Institut, Mohrenstr. 39, 10117 Berlin, Erdgeschoss, Erhard-Schmidt-Hörsaal

Veranstalter
Humboldt-Universität zu Berlin
Technische Universität Berlin
WIAS Berlin

Mittwoch, 26.06.2024, 17:15 Uhr (WIAS-ESH)

Berliner Kolloquium Wahrscheinlichkeitstheorie
Noemi Kurt, Goethe University Frankfurt:
tba
mehr ... Veranstaltungsort
Weierstraß-Institut, Mohrenstr. 39, 10117 Berlin, Erdgeschoss, Erhard-Schmidt-Hörsaal

Veranstalter
Humboldt-Universität zu Berlin
Technische Universität Berlin
WIAS Berlin

1. Juli 2024 (WIAS-ESH)

Workshop/Konferenz: Developments in Computational Finance - Honoring John Schoenmakers on the occasion of his retirement
mehr ... Veranstaltungsort
Weierstraß-Institut, Mohrenstr. 39, 10117 Berlin, Erdgeschoss, Erhard-Schmidt-Hörsaal

Veranstalter
WIAS Berlin

Mittwoch, 03.07.2024, 14:14 Uhr (WIAS-ESH)

Berliner Oberseminar „Nichtlineare partielle Differentialgleichungen” (Langenbach-Seminar)
Dr. Andreas Vikelis, Universität Wien, Österreich:
Measure-valued solutions for non-associative finite plasticity
mehr ... Veranstaltungsort
Weierstraß-Institut, Mohrenstr. 39, 10117 Berlin, Erdgeschoss, Erhard-Schmidt-Hörsaal

Abstrakt
The variational treatment of evolutionary nonassociative elasto-plasticity at finite strains remains unexplored. In this direction, following the concept of energetic solutions, we present an existence result for measure-valued solutions of the quasistatic evolution problem which are stable and balance the energy. In particular, we apply a modification of the standard timediscretization scheme, considering Young measures generated by piecewise constant interpolants of time-discrete solutions of a properly defined minimization problem. A key point in our analysis is the limit passage in the dissipation. The later calls for time-continuity properties of the stresses which are not expected in the quasistatic framework. To overcome this obstacle we introduce a regularization of the generalized stress in the definitionof our energetic solutions. Joint work with Ulisse Stefanelli.

Weitere Informationen
Oberseminar “Nichtlineare Partielle Differentialgleichungen” (Langenbach Seminar)

Veranstalter
Humboldt-Universität zu Berlin
WIAS Berlin

Mittwoch, 10.07.2024, 14:15 Uhr (WIAS-ESH)

Berliner Oberseminar „Nichtlineare partielle Differentialgleichungen” (Langenbach-Seminar)
Prof. Dr. Caroline Lasser, Technische Universität München:
Variational Gaussian approximation for quantum dynamics
mehr ... Veranstaltungsort
Weierstraß-Institut, Mohrenstr. 39, 10117 Berlin, Erdgeschoss, Erhard-Schmidt-Hörsaal

Abstrakt
The talk considers the time-dependent Schrödinger equation with smooth magnetic and electric potentials in semiclassical scaling. We analyse nonlinearly parametrized approximations by single Gaussian wave packets via the Dirac--Frenkel variational principle. We derive ordinary differential equations of motion for the parameters of the variational solution. We present L²-error bounds and unexpectedly accurate observable error bounds. This is joint work with S. Burkhard, B. Dörich, and M. Hochbruck.

Veranstalter
Humboldt-Universität zu Berlin
WIAS Berlin

Mittwoch, 10.07.2024, 16:15 Uhr (WIAS-ESH)

Berliner Kolloquium Wahrscheinlichkeitstheorie
Dan Crisan, Imperial College London:
tba
mehr ... Veranstaltungsort
Weierstraß-Institut, Mohrenstr. 39, 10117 Berlin, Erdgeschoss, Erhard-Schmidt-Hörsaal

Veranstalter
Humboldt-Universität zu Berlin
Technische Universität Berlin
WIAS Berlin

Mittwoch, 10.07.2024, 17:15 Uhr (WIAS-ESH)

Berliner Kolloquium Wahrscheinlichkeitstheorie
Jiniao Qiu, U of Calgary:
tba
mehr ... Veranstaltungsort
Weierstraß-Institut, Mohrenstr. 39, 10117 Berlin, Erdgeschoss, Erhard-Schmidt-Hörsaal

Veranstalter
Humboldt-Universität zu Berlin
Technische Universität Berlin
WIAS Berlin

Montag, 15.07.2024, 10:00 Uhr (WIAS-ESH)

MATH+ Thematic Einstein Semester on “Mathematics for Quantum Technologies”
Prof. Ulf Leonhardt, Weizmann Institute of Science, Israel:
First advanced lecture of the series “Forces of the quantum vacuum” .
mehr ... Veranstaltungsort
Weierstraß-Institut, Mohrenstr. 39, 10117 Berlin, Erdgeschoss, Erhard-Schmidt-Hörsaal

Abstrakt
Topic: Setting the scene
Quantization of the electromagnetic field in media and in space-time
Normal modes and harmomic oscillators
Zero-point energy
Casimir's cavity: 1D case, zeta-function renormalization
Casimir's cavity: 3D case, Casimir's renormalization

Veranstalter
WIAS Berlin
Einstein Foundation Berlin

Dienstag, 16.07.2024, 10:00 Uhr (WIAS-ESH)

MATH+ Thematic Einstein Semester on “Mathematics for Quantum Technologies”
Prof. Ulf Leonhardt, Weizmann Institute of Science, Israel:
Second advanced lecture of the series “Forces of the quantum vacuum” .
mehr ... Veranstaltungsort
Weierstraß-Institut, Mohrenstr. 39, 10117 Berlin, Erdgeschoss, Erhard-Schmidt-Hörsaal

Abstrakt
Topic: Lifshitz theory
The need for a theory in dispersive and dissipative media
Point-splitting method
Fluctuation-dissipation theorem
Kubo-Martin-Schwinger relation
Lifshitz formula in planar, piece-wise homogenous media

Veranstalter
WIAS Berlin
Einstein Foundation Berlin

Donnerstag, 18.07.2024, 10:00 Uhr (WIAS-ESH)

MATH+ Thematic Einstein Semester on “Mathematics for Quantum Technologies”
Prof. Ulf Leonhardt, Weizmann Institute of Science, Israel:
Third advanced lecture of the series “Forces of the quantum vacuum” .
mehr ... Veranstaltungsort
Weierstraß-Institut, Mohrenstr. 39, 10117 Berlin, Erdgeschoss, Erhard-Schmidt-Hörsaal

Abstrakt
Topic: Applications
Imaginary frequencies for capturing the broad band of quantum forces
Thermal Casimir effect
Perfectly conducting cavity
Magnetic mirror and Casimir repulsion
Permittivity hierarchy and repulsive Casimir forces
Negative refraction and quantum levitation
Engineering in the imaginary part of the spectrum


Veranstalter
WIAS Berlin
Einstein Foundation Berlin

Freitag, 19.07.2024, 10:00 Uhr (WIAS-ESH)

MATH+ Thematic Einstein Semester on “Mathematics for Quantum Technologies”
Prof. Ulf Leonhardt, Weizmann Institute of Science, Israel:
Fourth advanced lecture of the series “Forces of the quantum vacuum” .
mehr ... Veranstaltungsort
Weierstraß-Institut, Mohrenstr. 39, 10117 Berlin, Erdgeschoss, Erhard-Schmidt-Hörsaal

Abstrakt
Topic: Outlook
The quantum vacuum seen by accelerated observers (relativistic acceleration, Rindler coordinates, Unruh effect)
Entanglement in the quantum vacuum
Classical analogue of the Unruh effect
The case for a Casimir cosmology

Veranstalter
WIAS Berlin
Einstein Foundation Berlin