Limit theorems for integrated trawl processes with symmetric Lévy bases

Abstract

We study long time behavior of integrated trawl processes introduced by Barndorff-Nielsen (2011). The trawl processes form a class of stationary infinitely divisible processes, they are described by an infinitely divisible random measure (Lévy base) and a family of shifts of a fixed set (trawl). We assume that the Lévy base is symmetric and homogeneous and that the trawl set is determined by the trawl function that decays slowly. Depending on the geometry of the trawl set and on the Lévy measure corresponding to the Lévy base we obtain various types of limits in law of the normalized integrated trawl processes for large times. The limit processes are always stable and self-similar with stationary increments. In some cases they have independent increments – they are stable Lévy processes where the index of stability depends on the parameters of the model. We show that stable limits with stability index smaller than $2$ may appear even in cases when the underlying Lévy base has all its moments finite. In other cases, the limit process has dependent increments and it may be considered as a new extension of fractional Brownian motion to the class of stable processes.