Some particular self-interacting diffusions: Ergodic behaviour and almost sure convergence

Details Some particular self-interacting diffusions: Ergodic behaviour and almost sure convergence Some particular self-interacting diffusions: Ergodic behaviour and almost sure convergence

2007-07-19

arxiv.org/abs/0707.2908v3

Bernoulli 2011, Vol. 17, No. 4, 1248-1267

Mathematics

Probability

Published in at http://dx.doi.org/10.3150/10-BEJ310 the Bernoulli (http://isi.cbs.nl/bernoulli/) by the International Statisti

Scientific paper

10.3150/10-BEJ310

This paper deals with some self-interacting diffusions $(X_t,t\geq 0)$ living on $\mathbb{R}^d$. These diffusions are solutions to stochastic differential equations: \[\mathrm{d}X_t=\mathrm{d}B_t-g(t)\nabla V(X_t-\bar{\mu}_t)\,\mathrm{d}t,\] where $\bar{\mu}_t$ is the empirical mean of the process $X$, $V$ is an asymptotically strictly convex potential and $g$ is a given function. We study the ergodic behaviour of $X$ and prove that it is strongly related to $g$. Actually, we show that $X$ is ergodic (in the limit quotient sense) if and only if $\bar{\mu}_t$ converges a.s. We also give some conditions (on $g$ and $V$) for the almost sure convergence of $X$.

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