## Graphon mean field systems: Large population and long time limits

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**Graphon mean field systems: Large population and long time limits**

Prof. Dr. Erhan Bayraktar

Department of Mathematics, University

of Michigan, USA

**Invited by**: Sevtap Kestel**Place:** https://zoom.us/j/98408006920?pwd=eHQ2YzNMakxFamhDL1k1eDRTTURIQT09**Zoom Meeting ID:** 984 0800 6920**Passcode: ** 724032**Date/Time:** 18.05.2021, 15:30-16:30

**Abstract:** We consider heterogeneously interacting diffusive particle systems and their large population limit. The interaction is of mean field type with random weights characterized by an underlying graphon. The limit is given by a graphon particle system consisting of independent but heterogeneous nonlinear diffusions whose probability distributions are fully coupled. A law of large numbers result is established as the system size increases and the underlying graphons converge. Under suitable additional assumptions, we show the exponential ergodicity for the system, establish the uniform in time law of large numbers, and introduce the uniform in time Euler approximation. The precise rate of convergence of the Euler approximation is provided. Based on joint works with Suman Chakraborty and Ruoyu Wu.