Occupation densities for certain processes related to subfractional Brownian motion

Abstract

In this paper, we establish the existence of a square integrable occupation density for two classes of stochastic processes. First, we consider a Gaussian process with an absolutely continuous random drift, and second we handle the case of a (Skorohod) integral with respect to subfractional Brownian motion with Hurst parameter $H>\frac{1}{2}$. The proof of these results uses a general criterion for the existence of a square integrable local time, which is based on the techniques of Malliavin calculus.