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Homoclinic orbits of semilinear parabolic partial differential equations can split under time-periodic forcing as for ordinary differential equations. The stable and unstable manifold may intersect transverse at persisting homoclinic points. The size of the splitting is estimated to be exponentially small in the period of the forcing with ! 0. We extend here results in [FS96] to partial differential equations.

Exponentially small splitting of homoclinic orbits of parabolic differential equations under periodic forcing