Termine & Karriere

Veranstaltungen

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Mittwoch, 15.05.2024, 10:00 Uhr (WIAS-ESH): Forschungsseminar Mathematische Statistik
Dr. Fabian Telschow, Humboldt-Universität zu Berlin:
Estimation of the expected Euler characteristic of excursion sets of random fields and applications to simultaneous confidence bands
mehr ... Veranstaltungsort
Weierstraß-Institut, Mohrenstr. 39, 10117 Berlin, Erdgeschoss, Erhard-Schmidt-Hörsaal

Abstrakt
The expected Euler characteristic (EEC) of excursion sets of a smooth Gaussian-related random field over a compact manifold can be used to approximate the distribution of its supremum for high thresholds. Viewed as a function of the excursion threshold, the EEC of a Gaussian-related field is expressed by the Gaussian kinematic formula (GKF) as a finite sum of known functions multiplied by the Lipschitz-Killing curvatures (LKCs) of the generating Gaussian field. In the first part of this talk we present consistent estimators of the LKCs as linear projections of “pinned" Euler characteristic (EC) curves obtained from realizations of zero-mean, unit variance Gaussian processes. As observed data seldom is Gaussian, we generalize these LKC estimators by an unusual use of the Gaussian multiplier bootstrap to obtain consistent estimates of the LKCs of Gaussian limiting fields of non-stationary statistics. In the second part, we explain applications of LKC estimation and the GKF to simultaneous familywise error rate inference, for example, by constructing simultaneous confidence bands and CoPE sets for spatial functional data over complex domains such as fMRI and climate data and discuss their benefits and drawbacks compared to other methodologies.

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, 15.05.2024, 11:30 Uhr (WIAS-405-406): Seminar Interacting Random Systems
Adrián Gonzalez Casanova, UNAM, Mexico and University of California, Berkeley:
A random model of Poissonian interacting trajectories inspired by the Lenski experiment
mehr ... Veranstaltungsort
Weierstraß-Institut, Mohrenstr. 39, 10117 Berlin, 4. Etage, Raum: 405/406

Abstrakt
Random geometric phenomena emerge as a result of mutations and selection within the Lenski experiment. In this presentation, I will delve into A Random Model of Poissonian Interacting Trajectories, which can be derived as a scaling limit from classic models in population genetics. This model exhibits a complex geometric framework, offering insights into the effect of clonal interference on evolutionary dynamics.

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Seminar Interacting Random Systems (Online Event)

Veranstalter
WIAS Berlin
Mittwoch, 15.05.2024, 14:15 Uhr (WIAS-ESH): Berliner Oberseminar „Nichtlineare partielle Differentialgleichungen” (Langenbach-Seminar)
Dr. Erica Ipocoana, Freie Universität Berlin:
Non-isothermal phase-field models for tumor growth
mehr ... Veranstaltungsort
Weierstraß-Institut, Mohrenstr. 39, 10117 Berlin, Erdgeschoss, Erhard-Schmidt-Hörsaal

Abstrakt
We present two different diffuse interface models for tumor growth. In this context, the tumor is seen as an expanding mass surrounded by healthy tissues, while the interface in between contains a mixture of both healthy and tumor cells. The evolution of the system is assumed to be governed by biological mechanisms such as proliferation of cells via nutrient consumption and apoptosis. Besides, both the models include the effects of temperature variations. From the medical point of view, it is clear that the temperature does have effects on tumor growth and that in particular hyperthermia can lead to partial or complete destruction of tumor cells. The first model is a Cahn--Hilliard model, while the second is of Allen--Cahn type. After deriving the models following the microforces approach, we focus on proving the well-posedness and compare which regularity we are able to get for the solutions. Part of these results have been obtained in a recent collaboration with Stefania Gatti and Alain Miranville.

Veranstalter
Humboldt-Universität zu Berlin
WIAS Berlin
Mittwoch, 15.05.2024, 16:15 Uhr (WIAS-ESH): Berliner Kolloquium Wahrscheinlichkeitstheorie
Adrián González-Casanova, UNAM, Mexico and University of California, Berkeley:
Sample Duality
mehr ... Veranstaltungsort
Weierstraß-Institut, Mohrenstr. 39, 10117 Berlin, Erdgeschoss, Erhard-Schmidt-Hörsaal

Abstrakt
Heuristically, two processes are dual if one can find a function to study one process by using the other. Sampling duality is a duality which uses a duality function S(n, x) of the form "what is the probability that all the members of a sample of size n are of a certain type, given that the number (or frequency) of that type of individuals is x". Implicitly, this technique can be traced back to the work of Blaise Pascal. Explic- itly, it was studied in a paper of Martin Möhle in 1999 in the context of population genetics. We will discuss examples for which this technique proves to be useful, including applications to the Simple Exclusion Process and (work in progress) a universality result for the FKPP equation.

Veranstalter
Humboldt-Universität zu Berlin
Technische Universität Berlin
WIAS Berlin
Donnerstag, 16.05.2024, 14:00 Uhr (WIAS-ESH): Seminar Numerische Mathematik
Dr. Medine Demir:
Pressure-robust approximation of the incompressible Navier--Stokes equations in a rotating frame of reference
mehr ... Veranstaltungsort
Weierstraß-Institut, Mohrenstr. 39, 10117 Berlin, Erdgeschoss, Erhard-Schmidt-Hörsaal

Abstrakt
A pressure-robust space discretization of the incompressible Navier--Stokes equations in a rotating frame of reference is considered. The discretization employs divergence-free, $H^1$-conforming mixed finite element methods like Scott--Vogelius pairs. An error estimate for the velocity is derived that tracks the dependency of the error bound on the coefficients of the problem, in particular on the angular velocity. Numerical examples support the theoretical results.

Veranstalter
WIAS Berlin
Donnerstag, 16.05.2024, 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
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, 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
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
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, 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