Neutrino, photon interaction in unparticle physics

摘要

We investigate the impact of unparticle physics on the annihilation of relic neutrinos with the neutrinosidentified as primary source of ultra high energy (UHE) cosmic ray events, producing a cascade of photonsand charged particles. We compute the contribution of the unparticle exchange to the cross-sectionsν ν →γγ and ν ν → f f scattering. We estimate the neutrino–photon decoupling temperature from thereaction rate of ν ν →γγ. We find that the inclusion of unparticles can in fact account for the flux ofUHE cosmic rays and can also result in the lowering of neutrino–photon decoupling temperature belowthe QCD phase transition for unparticle physics parameters in a certain range. We calculate the mean freepath of these high energy neutrinos annihilating themselves with the relic neutrinos to produce vector,axial-vector and tensor unparticles.