## Electronic Journal of Probability

### Interacting Particle Systems and Yaglom Limit Approximation of Diffusions with Unbounded Drift

Denis Villemonais

#### Abstract

We study the existence and the exponential ergodicity of a general interacting particle system, whose components are driven by independent diffusion processes with values in an open subset of $\mathbb{R}^d$, $d\geq1$. The interaction occurs when a particle hits the boundary: it jumps to a position chosen with respect to a probability measure depending on the position of the whole system. Then we study the behavior of such a system when the number of particles goes to infinity. This leads us to an approximation method for the Yaglom limit of multi-dimensional diffusion processes with unbounded drift defined on an unbounded open set. While most of known results on such limits are obtained by spectral theory arguments and are concerned with existence and uniqueness problems, our approximation method allows us to get numerical values of quasi-stationary distributions, which find applications to many disciplines. We end the paper with numerical illustrations of our approximation method for stochastic processes related to biological population models.

#### Article information

Source
Electron. J. Probab., Volume 16 (2011), paper no. 61, 1663-1692.

Dates
Accepted: 1 September 2011
First available in Project Euclid: 1 June 2016

https://projecteuclid.org/euclid.ejp/1464820230

Digital Object Identifier
doi:10.1214/EJP.v16-925

Mathematical Reviews number (MathSciNet)
MR2835250

Zentralblatt MATH identifier
1244.82052

Rights

#### Citation

Villemonais, Denis. Interacting Particle Systems and Yaglom Limit Approximation of Diffusions with Unbounded Drift. Electron. J. Probab. 16 (2011), paper no. 61, 1663--1692. doi:10.1214/EJP.v16-925. https://projecteuclid.org/euclid.ejp/1464820230

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