Nicolas Zalduendo-Vidal

In this talk, I will establish central limit theorems for a large class of supercritical branching Markov processes in infinite dimension with spatially dependent and non-necessarily local branching mechanisms. This result relies on a fourth moment assumption and the exponential convergence of the mean semigroup in a weighted total variation norm. This latter assumption is pretty weak and does not necessitate symmetric properties or specific spectral knowledge on this semigroup.
In particular, I will recover two of the three known regimes (namely the small and critical branching processes) of convergence in known cases, and extend them to a wider family of processes. The proof of this results is based on Stein's method, which in addition provides a rate of convergence. This work is in collaboration with Bertrand Cloez.