Abstract
We prove limit theorems for rescaled occupation time fluctuations of a $(d,α,β)$-branching particle system (particles moving in $ℝ^d$ according to a spherically symmetric $α$-stable Lévy process, $(1+β)$-branching, $0<β<1$, uniform Poisson initial state), in the cases of critical dimension, $d=α(1+β)/β$, and large dimensions, $d>α(1+β)/β$. The fluctuation processes are continuous but their limits are stable processes with independent increments, which have jumps. The convergence is in the sense of finite-dimensional distributions, and also of space-time random fields (tightness does not hold in the usual Skorohod topology). The results are in sharp contrast with those for intermediate dimensions, $α/β<d<d(1+β)/β$, where the limit process is continuous and has long-range dependence. The limit process is measure-valued for the critical dimension, and $\mathcal{S}^\prime(\mathbb{R}^{d})$-valued for large dimensions. We also raise some questions of interpretation of the different types of dimension-dependent results obtained in the present and previous papers in terms of properties of the particle system.
Citation
Tomasz Bojdecki. Luis G. Gorostiza. Anna Talarczyk. "Occupation time fluctuations of an infinite-variance branching system in large dimensions." Bernoulli 13 (1) 20 - 39, February 2007. https://doi.org/10.3150/07-BEJ5170
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