Multipole decomposition of potentials in relativistic heavy ion collisions

In relativistic heavy ion collisions an exact multipole decomposition of the Lorentz transformed time dependent Coulomb potentials in a coordinate system with equal constant, but opposite ion velocities, is obtained for both zero and different from zero impact parameter. The case of large values of γ and the gauge transformation of the interaction removing both the γ dependence and the ln b dependence are also considered. (author)