Non-Uniqueness of the Lienard-Wiechert Potential
  The Lienard-Wiechert potential is one of the central equations of classical electrodynamics. Among its properties are these: it satisfies the (linear) homogeneous wave equation and Lorenz Gauge condition in free space, it varies inversely with distance from the classical point-source that is movong arbitrarily, and its effects propagate along straight lines at constant speed (the speed of light). Do any other retarded potentials satisfy these properties? It is shown here that other such potentials do exist, and a general formula is derived. 
Andrew T. Hyman
physics.gen-ph