Measuring the relaxation times of momenta and temperatures in strongly coupled plasmas

The collision time of the Boltzmann operator can be determined by the relaxation times of the momenta and the temperatures of two species in a plasma. The most intuitive way to get these times is to perform molecular dynamics (MD) simulations. MD can provide the velocity distribution of a many-particle system, hence the time evolution of velocity moments. However, MD requires huge computational effort to calculate the Coulomb interactions between charged particles. In order to reduce simulation time, we constructed a code that utilizes the multipole expansion and GPU acceleration. We report on relaxation times of momenta and temperatures for a strongly coupled plasma with various parameters.