Guest scientists visiting the IRTG in Bielefeld for research and teaching. Titles of talks given by the guest scientists are listed as well.

**Olaf Post** (Trier), 16 September – 18 September 2024

*IRTG Seminar: Different variants of generalised operator norm convergence*

**Denis Brazke** (Heidelberg), 18 June – 20 June 2024

*IRTG Online Seminar: Asymptotic analysis for a sharp interface model related to pattern formation in biomembranes*

**Lucian Beznea** (Bukarest), February 16 –- February 25, 2023

**Gerald Trutnau** (Seoul), February 8 –- February 26, 2023

**Rene Schilling** (Dresden), February 1 –- February 2, 2023

**Takashi Kumagai** (Kyoto), March 18 –- March 23, 2020

**Peter Bella** (Dortmund), January 17, 2020

**Martin Slowik** (Berlin), December 11 – December 13, 2019

**Bartlomiej Dyda** (Wrocław), November 10 –- November 17, 2019

**Takashi Kumagai** (Kyoto), November 4 –- November 9, 2019

*IRTG Colloquium: Anomalous diffusions and time fractional differential equations*

**Takashi Kumagai** (Kyoto), September 25 –- October 1, 2019

**Jean-Christophe Mourrat** (Paris), July 11, 2019

*IRTG Colloquium Title: Quantitative stochastic homogenization*

**Jonas Tölle** (Augsburg), July 01–05, 2019

**Lauri Viitasaari** (Aalto), July 01–05, 2019

**Dmitri Finkelshtein** (Swansea), June 23 – July 7, 2019

*Topics Lecture: Dynamics of interacting systems*

**Takashi Kumagai** (Kyoto), June 16 –- July 6, 2019

**Jesper R. Ipsen** (Melbourne), June 10 – June 20, 2019

*Scientific block course: High dimensional stochastic fields and large complex systems*

**Russell Schwab** (Michigan State), May 12 – June 1, 2019

**Reinhard Hoepfner** (Mainz), May 9, 2019

*IRTG Colloquium Title: Ergodic branching diffusions with immigration: invariant occupation measure, high-frequency observation and identification of particles, estimation of the diffusion coefficient at nonparametric rates*

**Andrey Piatnitski** (the Arctic University of Norway), April 7–April 28, 2019

**Elena Zhizhina** (Institute for Information Transmission Problems Moscow), April 7–April 28, 2019

**Claudio Landim** (Rio de Janeiro), February 20 – February 27, 2019

*Scientific block course: Potential Theory and Metastable Markov chains *

**Stefan Neukamm** (TU Dresden), February 11 – February 14, 2019

*IRTG Retreat Norderney*

**Dmitri Finkelshtein** (Swansea), January 20 – January 27, 2019

**Matteo Cozzi** (Bath), January 13 – January 18, 2019

*IRTG Seminar Analysis Title: Regularity results for nonlocal minimal graphs*

**David Criens** (München), January 09 – January 11, 2019

*IRTG Seminar Analysis Title: Harnack inequalities for RWRE in balanced environments*

**Angkana Rüland** (Max Planck Institute for Mathematics in the Sciences, Leipzig), January 9 – January 11, 2019

*IRTG Colloquium Title: On the (fractional) Calderón problem*

**Dmitri Finkelshtein** (Swansea), December 16 –- 23, 2018

**Lucian Beznea** (Bucharest), December 01 –- 23, 2018

**Iulian Cimpean** (Bucharest), December 01 –- 23, 2018

**Nina Gantert** (Munich), December 6, 2018

*IRTG Colloquium Title: Decisiveness or flexibility: who wins?*

**Sven Jarohs** (Frankfurt), November 22 – 23, 2018

*IRTG Seminar Analysis Title: On higher-order fractional Laplacians*

**Kohei Suzuki** (Bonn), November 22, 2018

*IRTG Colloquium Title: Diffusion Processes Under Synthetic Lower Ricci Curvature Bounds*

**Takashi Kumagai** (Kyoto), November 11 –- November 14, 2018

**Mladen Savov** (Sofia), November 9 – November 10, 2018

*IRTG Seminar Analysis Title: Bernstein-gamma functions and exponential functionals of Lévy processes*

**Russell Schwab** (Michigan State), October 29 – November 14, 2018

*IRTG Seminar Analysis Title: Some free boundary evolutions that are equivalent to parabolic integro-differential equations*

**Krzysztof Bogdan** (Breslau), October 8 – October 12, 2018

*IRTG Colloquium Title: Yaglom limit for stable processes in cones*

**Joe P. Chen** (Colgate University), August 31 – November 8, 2018

*Scientific block course: Random processes induced by Laplacian determinants*

**Takashi Kumagai** (Kyoto), September 2–September 7, 2018

**Panki Kim** (Seoul), August 30–September 8, 2018

**Zoran Vondracek** (Zagreb), August 30–September 8, 2018

**Armin Schikorra** (Pittsburgh), May 7–May 13, 2018

*Hölder-Analysis of the Topology of the Heisenberg group*

**Vedran Sohinger** (Warwick), February 27–March 3, 2018

**Takashi Kumagai** (Kyoto), February 8–February 11, 2018

**Niels Jacob** (Swansea), January 29–February 2, 2018

*Aspects of micro-local analysis in the theory of generators of Feller semi-groups*

**Xuan Liu** (Oxford), January 28–February 4, 2018

*BSDEs and non-linear parabolic PDEs on the Sierpinski gasket*

**Lukasz Lezaj** (Wroclaw), January 10–January 17, 2018

**Jan Simmer** (Trier), January 9, 2018

*Approximation of of the Sierpinski Gasket by discrete and metric
graphs:norm convergence of resolvents and spectra*

**Andrey Piatnitski** (the Arctic University of Norway), January 4–January 21, 2018

*Homogenization of Steklov sieve spectral problem*

**Christian Kühn** (München), December 21, 2017

*Dynamics of Nonlocal PDEs*

**Jonas Tölle** (Augsburg), December 06–13, 2017

*The set of sub-o-algebras is a compact metric space*

**Lauri Viitasaari** (Helsinki), December 06–13, 2017

*Pathwise Stieltjes integras of discontinuously evaluated*

**Takashi Kumagai** (Kyoto), November 18–21, 2017

**Franziska Kühn** (Toulouse), November 16 – 18, 2017

*Feller processes and their connection to martingale problems for Lévy-type operators*

**Dmitri Finkelshtein** (Swansea), November 6 – 17, 2017

Scientific block course: *Long-time behavior in nonlocal reaction-diffusion equations*

**Serena Dipierro** (Milano), October 19 – 27, 2017

*Crystal dislocation, nonlocal equations and fractional dynamical systems*

**Guohuan Zhao** (Chinese Academy of Science), October 12 – December 15, 2017

*Ergodicity of stochastic differential equations with distribution drifts*

**Florentin Münch** (Universität Potsdam), September 30 – October 6, 2017

*Ricci curvature on infinite graphs and stochastic completeness*

**Takashi Kumagai** (Kyoto), August 29 - September 1, 2017

**Markus Kunze** (Köln), July 28, 2017

*Almost surely recurrent motions in the Euclidean space*

**Russell Schwab** (Michigan State), July 17 – 28, 2017

*A min-max formula for Lipschitz operators that satisfy the global comparison principle and some applications*

**Bartlomiej Dyda** (Wroclaw University), July 17 – August 12, 2017

*On Function Spaces and Extensin Results for Nonlocal Dirichlet Problems*

**Jurij Kozicki** (Lublin), July 16 – August 31, 2017

*Topics Lecture “Dynamics of interacting systems”*

**Joe P. Chen** (Colgate Univ), July 8 – August 14, 2017

Scientific block course: *Scaling limits of particle systems on nonsmooth spaces*

**Matthias Erbar** (Bonn), July 7, 2017

*A gradient flow approach to the Boltzmann equation*

**Antonia Passarelli di Napoli** (Napoli), June 26 – 30, 2017

*Regularity results for minimizers of a class of degenerate
functionals with discontinuous coeffcients*

**Martina Hofmanová** (Berlin), June 22 – 26, 2017

*Stochastic mean curvature flow*

**Dorothee Knees** (Kassel), June 16, 2017

*Discussion of different notions of solutions and
time-discretization schemes for rate-independent damage*

**Peter Takáč** (Rostock), June 9, 2017

*Convergence to travelling waves in Fisher's population genetics model with degenerate
diffusion and a non-Lipschitzian reaction term*

**Rico Zacher** (Ulm), June 6 – 9, 2017

*Long-time behaviour of solutions to time-fractional diffusion equations*

**Bogdan Matioc** (Düsseldorf), June 2, 2017

*Mathematical aspects of fluid flows in porous media*

**Alexander Teplyaev** (Univ. of Connecticut), June 1, 2017

*Average power dissipation in AC fractal networks*

**Uta Freiberg** (Stuttgart), May 10 – 12, 2017

*Differential operators and generalized trigonometric functions on fractal subsets of the real line*

**Angkana Rüland** (Oxford), May 9 – 12, 2017

*Regularity for the thin obstacle problem – Rough variable coefficients and higher regularity*

**Tuan Anh Nguyen** (Berlin), May 5, 2017

*A Liouville principle for the random conductance model*

**Tobias Weich** (Paderborn), April 28, 2017

*Pollicott-Ruelle resonances*

**Xiaochuan Tian** (Columbia), April 18 – 20, 2017

*Trace theorems for some nonlocal function spaces with heterogeneous localization*

**Grzegorz Karch** (Wroclaw), March 13 – 18, 2017

**Milosz Krupski** (Wroclaw), March 13 – 18, 2017

**Armin Schikorra** (Freiburg), February 14 – 23, 2017

Scientific block course: * Harmonic Maps into Manifolds: Local, Nonlocal, and Applications*

**Jürgen Saal** (Düsseldorf), February 6, 2017

*Regularity of fluid flow in non-smooth regions*

**Emil Wiedemann** (Hannover), January 9, 2017

*Regularity and Energy Conservation for the Euler Equations*

**Andrey Pyatnitskiy** (Narvik), January 5 – February 4, 2017

Scientific block course: *Homogenization*

**Alexei Daletskii** (York), December 4 – 23, 2016

*Interacting vector fields on unbound degree graphs*

**Peter Kern** (Düsseldorf), December 15, 2016

*Stochastic models for coupled fractional diffusion equations*

**Gregory Schehr** (Paris), December 7, 2016

*Extreme statistics of trapped fermions and random matrix theory*

**Nicola Visciglia** (Pisa), December 5, 2016

*On large time dynamics for sNLS and HW*

**Tadahiro Oh** (Edinburgh), December 1, 2016

*Invariant and quasi-invariant measures for Hamiltonian PDEs*

**Giovanni Cicuta** (Parma), November 16, 2016

*Random Antagonistic Matrices*

**Reinhard Racke** (Konstanz), November 14, 2016

*The Cauchy problem for thermoelastic plate equations*

**Diogo Oliveira e Silva** (Bonn), November 7, 2016

*Sharp Strichartz inequalities for higher order Schrödinger equations*

**Panki Kim** (Seoul), October 6 – 14, 2016

**Takashi Kumagai** (Kyoto), October 4 – 12, 2016