Moments of additive martingales of branching L\'evy processes and applications

Abstract

Let $W_t(\theta)$ be the Biggins martingale of a supercritical branching L\'evy process with non-local branching mechanism, and denote by $W_\infty(\theta)$ its limit. In this paper, we first study moment properties of $W_t(\theta)$ and $W_\infty(\theta)$, and the tail behavior of $W_\infty(\theta)$. We then apply these results to establish central limit theorems for $W_t(\theta)-W_\infty(\theta)$.