Upcoming Events

Many events are currently organized online. Information on how to access these events can be found by clicking “more” below the respective entry.


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Tuesday, 18.01.2022, 15:00 (Online Event)
Seminar Modern Methods in Applied Stochastics and Nonparametric Statistics
Yangwen Sun, Humboldt-Universität zu Berlin:
High dimensional change-point detection: A complete graph approach (online talk)
more ... Location
Online Event

Further Informations
Dieser Vortrag findet bei Zoom statt: https://zoom.us/j/492088715

Host
WIAS Berlin
Wednesday, 19.01.2022, 10:00 (WIAS-ESH)
Forschungsseminar Mathematische Statistik
Prof. Dr. Denis Belomestny, Universität Duisburg-Essen:
Achieving optimal sample complexity in reinforcement learning via upper solutions (hybrid talk)
more ... Location
Weierstraß-Institut, Mohrenstr. 39, 10117 Berlin, Erdgeschoss, Erhard-Schmidt-Hörsaal

Further Informations
Der Vortrag findet bei Zoom statt: https://zoom.us/j/159082384

Host
Humboldt-Universität zu Berlin
WIAS Berlin
Friday, 21.01.2022, 13:00 (WIAS-Library)
E-Coffee-Lecture
Dr. Matthias Liero, WIAS:
Coffee-Lecture: Automated building and testing of software projects using the WIAS Gitlab server
more ... Location
Weierstraß-Institut, Hausvogteiplatz 5-7, 10117 Berlin, Library (4. Etage)

Abstract
This talk gives an introduction to Gitlab pipelines on the recently installed Gitlab server at WIAS. We will discuss the basic ideas and concepts and go through a simple example of setting up such a pipeline.

Further Informations
The coffee-lecture will probably take place online

Host

WIAS Berlin
Wednesday, 26.01.2022, 15:15 (Online Event)
Berliner Oberseminar „Nichtlineare partielle Differentialgleichungen” (Langenbach-Seminar)
Prof. Dr. Alexander Mielke, WIAS Berlin:
On two coupled degenerate parabolic equations motivated by thermodynamics (online talk)
more ... Location
Online Event

Further Informations
Berliner Oberseminar “Nichtlineare partielle Differentialgleichungen” (Langenbach-Seminar)

Host
Humboldt-Universität zu Berlin
WIAS Berlin
Wednesday, 02.02.2022, 12:30 (WIAS-ESH)
Seminar Interacting Random Systems
Dr. Quirin Vogel, NYU Shanghai, China, Volksrepublik:
Infinite loops - The limit of the Feynman representation of the Bose gas (online talk)
more ... Location
Weierstraß-Institut, Mohrenstr. 39, 10117 Berlin, Erdgeschoss, Erhard-Schmidt-Hörsaal

Abstract
round 75 years ago, Feynman used path-integration to represent a gas of (interacting) bosons in a finite volume by an ensemble of brownian bridges, aka loops. Bosons exhibit Bose--Einstein condensation - a state of matter in which a macroscopic proportion of the particles occupy the same quantum state. It has been conjectured that the condensate is represented by “infinite” loops. We “verify” this for several cases by proving that the finite volume representation converges to the superposition of finite loops and the random interlacements. Prior knowledge of bosons/mathematical physics is not required for this talk.

Further Informations
Seminar Interacting Random Systems (Hybrid Event)

Host
WIAS Berlin
Wednesday, 02.02.2022, 15:15 (Online Event)
Berliner Oberseminar „Nichtlineare partielle Differentialgleichungen” (Langenbach-Seminar)
Dr. Upanshu Sharma, Freie Universität Berlin:
Variational structures beyond gradient flows (online talk)
more ... Location
Online Event

Abstract
Gradient flows is an important subclass of evolution equations, whose solution dissipates an energy 'as fast as possible'. This distinguishing feature endows these equations with a natural variational structure, which has received enormous attention over the last two decades. In recent years, it has become clear that if the gradient-flow equation originates from an underlying (reversible) stochastic particle system, then often the aforementioned variational structure is an exact decomposition of the large-deviation rate functional for the particle system. However, this decomposition and the corresponding gradient-flow structure breaks down if the underlying particles have additional non-dissipative effects (for instance in the case of non-reversible independent particles), even though the large-deviation rate functional is still available. Using the guiding example of independent non-reversible Markov jump particles, in this talk, I will discuss the various features of the rate functional and how it connects to relative entropy and Fisher information. Furthermore, I will show that if the underlying particle system is augmented with fluxes, then it is possible to derive gradient-flow-type structures in the non-reversible setting.

Further Informations
Oberseminar “Nichtlineare Partielle Differentialgleichungen” (Langenbach Seminar)

Host
Humboldt-Universität zu Berlin
WIAS Berlin
Wednesday, 09.02.2022, 12:30 (WIAS-ESH)
Seminar Interacting Random Systems
Tobias Paul, HU Berlin:
Modelling interactions of mutation, dormancy and transfer
more ... Location
Weierstraß-Institut, Mohrenstr. 39, 10117 Berlin, Erdgeschoss, Erhard-Schmidt-Hörsaal

Abstract
Recently, a toy model for the interaction of mutation and horizontal transfer was proposed by Champagnat, Méléard and Tran (2021). We extend their model to include the effects of competition induced dormancy and recover the convergence of the logarithmic population sizes. While the result remains unchanged, the qualitative behaviour of the limiting functions may exhibit properties of the model without dormancy but also entirely new phenomena. As an example we can observe an interesting non-monotonicity in the success of the dormancy traits depending on the strength of the dormancy initiation probability. Furthermore, we will discuss possible extensions and generalizations of the model. (This is joint work with Jochen Blath and András Tóbiás, TU Berlin)

Further Informations
Seminar Interacting Random Systems (Hybrid Event)

Host
WIAS Berlin
Wednesday, 23.02.2022, 12:30 (WIAS-ESH)
Seminar Interacting Random Systems
Dr. Ana Djurdjevac, Zuse Institute Berlin:
tba
more ... Location
Weierstraß-Institut, Mohrenstr. 39, 10117 Berlin, Erdgeschoss, Erhard-Schmidt-Hörsaal

Further Informations
Seminar Interacting Random Systems (Hybrid Event)

Host
WIAS Berlin
Wednesday, 09.03.2022, 12:30 (WIAS-ESH)
Seminar Interacting Random Systems
Alexander Hinsen, WIAS Berlin:
tba
more ... Location
Weierstraß-Institut, Mohrenstr. 39, 10117 Berlin, Erdgeschoss, Erhard-Schmidt-Hörsaal

Further Informations
Seminar Interacting Random Systems

Host
WIAS Berlin