The gravitational Vlasov-Poisson system with infinite mass and velocities in ${\mathbb{R}}^3$

We study existence and uniqueness of the solution to the gravitational Vlasov-Poisson system evolving in ${\mathbb{R}}^3$. It is assumed that initially the particles are distributed according to a spatial density with a power-law decay in space, allowing for unbounded mass, and an exponential decay in velocities given by a Maxwell-Boltzmann law. We extend a classical result which holds for systems with finite total mass.