SKYRMIONS AND DOMAIN-WALLS IN (2+1) DIMENSIONS

We study classical solutions of the vector O(3) sigma model in (2 + 1) dimensions, spontaneously broken to O(2) x Z(2). The model possesses Skyrmion-type solutions as well as stable domain walls which connect d ifferent vacua. We show that different types of waves can propagate on the wall, including waves carrying a topological charge. The domain w all can also absorb Skyrmions and, under appropriate initial condition s, it is possible to emit a Skyrmion from the wall.