Upcoming Events

Due to restrictions in connection with necessary measures to prevent infection, participation in events at the Institute is currently only possible after prior consultation with the organizers and registration.

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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Wednesday, 21.10.2020, 11:30 (WIAS-405-406)
Seminar Interacting Random Systems
Michiel Renger:
Variational structures beyond gradient flows: a macroscopic-fluctuation-theory perspective joint work with Rob Patterson (WIAS) and Upanshu Sharma (FU Berlin)
more ... Location
Weierstraß-Institut, Mohrenstr. 39, 10117 Berlin, 4. Etage, Raum: 405/406

Abstract
Variational formulations in physics are often related to probability via large deviations. Although the idea goes back to Onsager, modern work shows that the large deviations of reversible Markov processes are related to gradient flows. The challenge of non-equilibrium thermodynamics is now to uncover meaningful variational structures for irreversible Markov processes. In that case one can not rule out the occurrence of non-equilibrium steady states, which are best studied by taken particle fluxes into account; this is the approach of “macroscopic fluctuation theory” (MFT). Most literature on MFT study quadratic rate functionals exclusively. These come with a natural concept of orthogonality that allows the decomposition of the flux rate functional into reversible and irreversible parts. We generalise beyond the quadratic case, which is for example relevant for chemical reactions, biological fitness models and epidemiology. As a byproduct we derive a connection to so-called “FIR” inequalities, and we find that the gap is quantified by a large-deviation rate functional of a rather curious process that should be considered `purely irreversible'. Disclaimer: this talk will hardly be about probability, but it will be about analysis of large-deviation rate functionals of Markov processes.

Further Informations
Seminar Interacting Random Systems

Host
WIAS Berlin
Thursday, 22.10.2020, 16:00 (Online Event)
Forschungsseminar Mathematische Modelle der Photonik
Thorsten Svend Rasmussen, Technical University of Denmark:
Multi-purpose modelling of semiconductor Fano lasers: Switching, feedback, and non-linear dynamics
more ... Location
Online Event

Host
WIAS Berlin
November 2 – 4, 2020 (WIAS-ESH)
Workshop/Konferenz: Workshop on Stochastic Geometry and Communications
more ... Location
Weierstraß-Institut, Mohrenstr. 39, 10117 Berlin, Erdgeschoss, Erhard-Schmidt-Hörsaal

Host
WIAS Berlin
Wednesday, 11.11.2020, 11:30 (WIAS-405-406)
Seminar Interacting Random Systems
Stein Andreas Bethuelsen:
Invariance principle for random walks on dynamically averaging random conductances
more ... Location
Weierstraß-Institut, Mohrenstr. 39, 10117 Berlin, 4. Etage, Raum: 405/406

Abstract
We prove an invariance principle for continuous-time random walks in a dynamically averaging environment on Z. In the beginning, the conductances may fluctuate substantially, but we assume that as time proceeds, the fluctuations decrease according to a typical diffusive scaling and eventually approach constant unit conductances. The proof relies on a coupling with the standard continuous time simple random walk. Based on joint work with Christian Hirsch (Groningen) and Christian Mönch (Mainz).

Further Informations
Seminar Interacting Random Systems

Host
WIAS Berlin
Thursday, 26.11.2020, 16:00 (Online Event)
Forschungsseminar Mathematische Modelle der Photonik
Regina Finsterhölzl, TU Berlin:
Applying feedback control on quantum many-body systems within the matrix-product-state framework
more ... Location
Online Event

Host
WIAS Berlin