Veranstaltungen
Viele Veranstaltungen werden aktuell online durchgeführt. Informationen zum Zugang finden Sie jeweils unter „mehr” bei dem betreffenden Eintrag.
- Mittwoch, 31.05.2023, 10:00 Uhr (WIAS-ESH)
- Forschungsseminar Mathematische Statistik
Dr. Randolf Altmeyer, University of Cambridge:
Statistics for stochastic PDEs: Optimal rates and a nonparametric LAN expansion (hybrid talk)
mehr ... Veranstaltungsort
Weierstraß-Institut, Mohrenstr. 39, 10117 Berlin, Erdgeschoss, Erhard-Schmidt-Hörsaal
Abstrakt
We consider the problem of estimating the coefficients in second order linear stochastic partial differential equations (SPDE) from spatially discrete or locally averaged observations on a finite time horizon. For a nonparametric diffusivity, we obtain the local asymptotic normality (LAN) property, opening up the road to efficient estimation. The proof reveals interesting aspects of partially observed space-time random fields. It relies on stochastic filtering techniques, on the reproducing kernel Hilbert space of the observation process as well as on the solution of certain Wiener-Hopf integral equations. For lower order terms, we obtain rate-optimal estimators, exhibiting different rates of convergence depending on the differential order. We further establish a general moment-based technique for the joint estimation of diffusivity and volatility parameters, covering both discrete and local measurements.
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Der Vortrag findet auch via Zoom statt: https://zoom.us/j/159082384
Veranstalter
Humboldt-Universität zu Berlin
Universität Potsdam
WIAS Berlin
- Donnerstag, 01.06.2023, 14:00 Uhr (WIAS-ESH)
- Forschungsseminar Mathematische Modelle der Photonik
Lasse Ermoneit, WIAS:
Simulation of single-electron shuttling in a SiGe quantum bus
mehr ... Veranstaltungsort
Weierstraß-Institut, Mohrenstr. 39, 10117 Berlin, Erdgeschoss, Erhard-Schmidt-Hörsaal
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Forschungsseminar Mathematische Modelle der Photonik
Veranstalter
WIAS Berlin
- Dienstag, 06.06.2023, 15:00 Uhr (WIAS-405-406)
- Seminar Modern Methods in Applied Stochastics and Nonparametric Statistics
Simon Breneis, WIAS Berlin:
American options under rough Heston (hybrid talk)
mehr ... Veranstaltungsort
Weierstraß-Institut, Mohrenstr. 39, 10117 Berlin, 4. Etage, Raum: 405/406
Abstrakt
The rough Heston model is a popular option pricing model in mathematical finance. However, due to the non-semimartingale and non-Markovian characteristics of its volatility process, simulations can be prohibitively expensive in practice. Building on previous works, we approximate the volatility process with an N-dimensional diffusion, yielding a Markovian approximation of the rough Heston model. Then, we introduce a weak discretization scheme to simulate paths of these Markovian approximations. Our numerical experiments show that these approximations converge at a second-order rate as the number of time steps approaches infinity. We leverage these approximations to price American options under the rough Heston model.
Weitere Informationen
Dieser Vortrag findet bei Zoom statt: https://zoom.us/j/492088715
Veranstalter
WIAS Berlin
- Mittwoch, 07.06.2023, 11:30 Uhr (WIAS-405-406)
- Seminar Interacting Random Systems
Günter Last, Karlsruher Institut für Technologie:
tba
mehr ... Veranstaltungsort
Weierstraß-Institut, Mohrenstr. 39, 10117 Berlin, 4. Etage, Raum: 405/406
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Seminar Interacting Random Systems (Hybrid Event)
Veranstalter
WIAS Berlin
- Mittwoch, 21.06.2023, 11:30 Uhr (WIAS-405-406)
- Seminar Interacting Random Systems
Sanjoy Jhawar, WIAS Berlin:
tba
mehr ... Veranstaltungsort
Weierstraß-Institut, Mohrenstr. 39, 10117 Berlin, 4. Etage, Raum: 405/406
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Seminar Interacting Random Systems (Hybrid Event)
Veranstalter
WIAS Berlin
- Mittwoch, 28.06.2023, 11:30 Uhr (WIAS-405-406)
- Seminar Interacting Random Systems
Céline Kerriou, Universität zu Köln:
tba
mehr ... Veranstaltungsort
Weierstraß-Institut, Mohrenstr. 39, 10117 Berlin, 4. Etage, Raum: 405/406
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Seminar Interacting Random Systems (Hybrid Event)
Veranstalter
WIAS Berlin
- Mittwoch, 28.06.2023, 14:00 Uhr (WIAS-ESH)
- Berliner Oberseminar „Nichtlineare partielle Differentialgleichungen” (Langenbach-Seminar)
Dr. Peter Gladbach, Universität Bonn:
Homogenization and mean-field limits of transport costs (hybrid talk)
mehr ... Veranstaltungsort
Weierstraß-Institut, Mohrenstr. 39, 10117 Berlin, Erdgeschoss, Erhard-Schmidt-Hörsaal
Abstrakt
We treat the limits, in terms of Gamma-convergence, of several discrete dynamic transport costs. The first concerns Wasserstein-type transport actions on stationary random graphs, for which we use stochastic homogenization and geometric measure theory to find a continuous limit functional. (joint work with Lorenzo Portinale and Jan Maas) The second treats interacting particles with different origins and destinations, which will develop coordinated oscillations in order to minimize a common functional. We show Gamma-convergence as the number of particles tends to infinity, and that minimizers converge to solutions of a Vlasov equation. (joint work with Bernhard Kepka)
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Berliner Oberseminar “Nichtlineare partielle Differentialgleichungen” (Langenbach-Seminar)
Veranstalter
Humboldt-Universität zu Berlin
WIAS Berlin
- Mittwoch, 28.06.2023, 15:15 Uhr (WIAS-ESH)
- Berliner Oberseminar „Nichtlineare partielle Differentialgleichungen” (Langenbach-Seminar)
Dr. Peter Lewintan, Universität Duisburg-Essen:
Optimal Korn--Maxwell--Sobolev inequalities (hybrid talk)
mehr ... Veranstaltungsort
Weierstraß-Institut, Mohrenstr. 39, 10117 Berlin, Erdgeschoss, Erhard-Schmidt-Hörsaal
Abstrakt
We present a complete picture of coercive Korn-type inequalities for generalised incompatible fields, and optimally extend and unify several previously known inequalities that are crucial to the existence theory for a variety of models in continuum mechanics.
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Oberseminar “Nichtlineare partielle Differentialgleichungen” (Langenbach-Seminar)
Veranstalter
Humboldt-Universität zu Berlin
WIAS Berlin
- 3. – 5. Juli 2023 (WIAS-ESH)
- Workshop/Konferenz: Nonlinear Dynamics in Semiconductor Lasers 2023
mehr ... Veranstaltungsort
Weierstraß-Institut, Mohrenstr. 39, 10117 Berlin, Erdgeschoss, Erhard-Schmidt-Hörsaal
Veranstalter
Ferdinand-Braun-Institut, Leibniz-Institut für Höchstfrequenztechnik
WIAS Berlin
- Freitag, 07.07.2023, 08:00 Uhr (Harnack-Haus)
- Workshop: Phase transitions in random point systems
Phase transitions in random point systems
mehr ... Veranstaltungsort
Harnack-Haus -- Tagungsstätte der Max-Planck-Gesellschaft
Veranstalter
WIAS Berlin
DFG Schwerpunktprogramm 2265
- Mittwoch, 12.07.2023, 11:30 Uhr (WIAS-405-406)
- Seminar Interacting Random Systems
Klippel, TU Darmstadt:
tba
mehr ... Veranstaltungsort
Weierstraß-Institut, Mohrenstr. 39, 10117 Berlin, 4. Etage, Raum: 405/406
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Seminar Interacting Random Systems (Hybrid Event)
Veranstalter
WIAS Berlin
- Montag, 17.07.2023, 09:00 Uhr (Harnack-Haus)
- SPP2265 Summer School: Probability and geometry on configuration spaces
SPP2265 Summer School: Probability and geometry on configuration spaces
mehr ... Veranstaltungsort
Harnack-Haus -- Tagungsstätte der Max-Planck-Gesellschaft
Veranstalter
WIAS Berlin
DFG Schwerpunktprogramm 2265
- 30. August – 1. September 2023 (WIAS-ESH)
- Workshop/Konferenz: Workshop on Biophysics-based modeling and data assimilation in medical imaging 2023
mehr ... Veranstaltungsort
Weierstraß-Institut, Mohrenstr. 39, 10117 Berlin, Erdgeschoss, Erhard-Schmidt-Hörsaal
Veranstalter
WIAS Berlin
Charité - Universitätsmedizin Berlin
- 13. – 15. September 2023 (WIAS-ESH)
- Workshop/Konferenz: Energetic Methods for Multi-Component Reactive Mixtures Modelling Stability and Asymptotic Analysis
mehr ... Veranstaltungsort
Weierstraß-Institut, Mohrenstr. 39, 10117 Berlin, Erdgeschoss, Erhard-Schmidt-Hörsaal
Abstrakt
The central theme of this workshop are mechanical models describing the transport of mass, momentum, and energy in multi-component mixtures, including diffusion, convection, and heat transfer. A consistent account of reactions is a further concern. EMRM 2023 focuses in particular on energetic and entropic tools for strongly coupled systems of hyperbolic--parabolic type, whose analysis is still underdeveloped and has received insufficient attention relative to their tremendous significance in real-world applications. Many complex physical processes not only involve mass transfer induced by random diffusion, but also reaction processes and directed transport including non-local drifts induced, for instance, by the interaction of electrically charged particles. The relative influence of these different processes will depend on the specific application. Developing a framework that asymptotically relates the different models is nowadays an active field of research in multi-component flow modelling. This workshop focuses on the analysis of multi-component mixtures using diffusion models and hydrodynamic models, on the analysis of complex evolutionary systems of hyperbolic--parabolic type, including multi-phase problems, as well as on the connections between these approaches by means of asymptotic analysis.
Veranstalter
WIAS Berlin
Technische Universität Wien