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# Dr. Amarjit Budhiraja, UNC-CH – Numerical Approaches for Computing Quasi-stationary Distributions

## November 2, 2022 @ 4:00 pm - 5:00 pm

Mode: In-person

Title: Numerical Approaches for Computing Quasi-stationary Distributions

Abstract: Markov processes with absorbing states occur frequently in epidemiology, statistical physics, population biology, and other areas. Quasi-stationary distributions (QSD) are the basic mathematical object used to describe the long-time behavior of such Markov processes on non-absorption events. Just as stationary distributions of ergodic Markov processes make the law of the Markov process, initialized at that distribution, invariant at all times, quasi-stationary distributions are probability measures that leave the conditional law of the Markov process, on the event of non-absorption, invariant.

In this talk I will present a couple of numerical approaches for approximating QSD for Markov processes. These approaches use ideas from reinforced random walks, interacting particle systems, stochastic approximations and stochastic control theory.