Invariance principle for the maximal position process of branching Brownian motion in random environment

In this paper we study the maximal position process of branching Brownian motion in random spatial environment. The random environment is given by a process $\xi ={(\xi (x))}_{x\in \mathbb{R}}$ satisfying certain conditions. We show that the maximum position $M_t$ of particles alive at time $t$ satisfies a quenched strong law of large numbers and an annealed invariance principle.