  Interactions of small-amplitude monochromatic plane waves with domain walls
in (1+1) dimensional abelian Higgs model with a sextic potential were studied.
The effective force exerted on a domain wall was derived from a linearized
equation and compared with numerical simulations of the original model. It was
shown that the domain walls always accelerate in one direction, regardless of
the direction of the incoming wave. This implies that in some cases an effect
called negative radiation pressure is observed, i.e. instead of pushing, the
wave pulls the soliton.
