The general asymptotically flat solution of the five-dimensional vacuum equations Rsub(μv) = 0 with a light-like symmetry and a space-like axial symmetry

The general asymptotically flat solution of the five-dimensional vacuum equations Rsub(μv) = O with a light-like symmetry and a space-like axial symmetry is investigated. It is shown that this solution is reduced to a special pp wave. The consequences of this result for the author's concept of extended massless particles are discussed. (author)