Solitonic perturbations of perfect fluid Friedmann-Robertson-Walker cosmological models

The inverse scattering generation technique is applied to perfect fluid cosmological seed solutions in the context of a five-dimensional Kaluza-Klein formalism. As an example, the authors present a two-soliton metric generated from a Friedmann-Robertson-Walker background with a perfect fluid, which follows a general gamma-law equation of state. The resulting solution becomes asymptotically the background for large times. (author)