General approximation method for the distribution of Markov processes conditioned not to be killed
ESAIM: Probability and Statistics, Tome 18 (2014) , pp. 441-467.

We consider a strong Markov process with killing and prove an approximation method for the distribution of the process conditioned not to be killed when it is observed. The method is based on a Fleming-Viot type particle system with rebirths, whose particles evolve as independent copies of the original strong Markov process and jump onto each others instead of being killed. Our only assumption is that the number of rebirths of the Fleming-Viot type system doesn't explode in finite time almost surely and that the survival probability of the original process remains positive in finite time. The approximation method generalizes previous results and comes with a speed of convergence. A criterion for the non-explosion of the number of rebirths is also provided for general systems of time and environment dependent diffusion particles. This includes, but is not limited to, the case of the Fleming-Viot type system of the approximation method. The proof of the non-explosion criterion uses an original non-attainability of (0,0) result for pair of non-negative semi-martingales with positive jumps.

DOI : https://doi.org/10.1051/ps/2013045
Classification : 82C22,  65C50,  60K35,  60J60
Mots clés : particle systems, conditional distributions
@article{PS_2014__18__441_0,
author = {Villemonais, Denis},
title = {General approximation method for the distribution of Markov processes conditioned not to be killed},
journal = {ESAIM: Probability and Statistics},
pages = {441--467},
publisher = {EDP-Sciences},
volume = {18},
year = {2014},
doi = {10.1051/ps/2013045},
language = {en},
url = {http://www.numdam.org/articles/10.1051/ps/2013045/}
}
Villemonais, Denis. General approximation method for the distribution of Markov processes conditioned not to be killed. ESAIM: Probability and Statistics, Tome 18 (2014) , pp. 441-467. doi : 10.1051/ps/2013045. http://www.numdam.org/articles/10.1051/ps/2013045/

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