TeV gamma rays from distant BL Lacs and photon-paraphoton kinetic mixing

An effect of a proposed Beyond the Standard Model particle physics process on the energy spectra of distant astrophysical objects is presented. It is suggested that TeV gamma rays from distant BL Lacs may kinetically mix with hypothetical hidden sector paraphotons. The latter can traverse vast distances of space because of only very weak interactions with intervening objects or material. These paraphotons would then reconvert back into photons that have identical characteristics as their originators, and are detected on earth. Laser based photon regeneration experiments test this model of hidden sector physics in the range of parameters that would impact the TeV gamma ray energy spectra arriving from distant BL Lacs.