Ultrahigh energy neutrino absorption by neutrino dark matter

Details Ultrahigh energy neutrino absorption by neutrino dark matter Ultrahigh energy neutrino absorption by neutrino dark matter

Jun 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993phrvd..47.5247r&link_type=abstract

Physical Review D (Particles, Fields, Gravitation, and Cosmology), Volume 47, Issue 12, 15 June 1993, pp.5247-5252

Mathematics

Probability

64

Dark Matter, Particle-Theory And Field-Theory Models Of The Early Universe

Scientific paper

If the dark matter in the Universe consists of massive neutrinos (mνi~=30-100 eV, i=μ,τ), a cosmic ray νi of ultrahigh energies may be absorbed at large redshifts, or even while crossing galactic halos, due to their annihilation with the dark matter neutrinos. These processes can become very important for Eν~=M2Z/2mν~=5-10×1019 eV, for which the Z-exchange cross section is resonant, and may lead to a dip in the cosmic ray neutrino spectrum. I compute all the relevant contributions to the ν cross section and use them to evaluate the absorption redshift at ultrahigh energies and to analyze the absorption probability at large redshifts as well as in halos of galaxies. If the determination of the neutrino spectrum at those energies were to become experimentally feasible, the observation of the features discussed here would provide a clear indication of the nature of the dark matter.

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