On quantum Huygens principle and Rayleigh scattering
  We prove several minimal photon velocity estimates below the ionization threshold for a particle system coupled to the quantized electromagnetic or phonon field. Using some of these results, we prove the asymptotic completeness (for the Rayleigh scattering) on the states for which the expectation of the photon number is uniformly bounded. 
Jeremy Faupin and Israel Michael Sigal
math-ph math.MP