Solitonic Gravitational Waves in Gowdy Universes Background

With the Belinekii–Zakharov soliton (inverse scattering) technique a new inhomogenous solution of the vacuum Einsteins equations corresponding to a real pole is obtained from the Gowdy closed cosmological model as seed solution. It is shown also that the previous results of Belinskii and Zakharov for Bianchi type I cosmological model can be considered as a limiting case of our results.