Interactions of High Energy Cosmic Rays with Extragalactic Infrared   Radiation Background
  We consider the modification of extragalactic cosmic ray spectrum caused by cosmic ray interactions with infrared background photons which are present in the extragalactic space together with relic photons. It is assumed that cosmic ray spectrum at superhigh energies has extragalactic origin and is proton dominated. 
E.V.Bugaev, P.A.Klimai