  We calculate microscopically the interaction energy of domain walls
separating degenerate ground states in a chiral p-wave superconductor. The
interaction is mediated by the quasiparticles experiencing Andreev scattering
at the domain walls. As a by-product, we derive a useful general expression for
the free energy of an arbitrary nonuniform texture of the order parameter in
terms of the quasiparticle scattering matrix.
