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Extremely High Energy Neutrinos, Neutrino Hot Dark Matter, and the Highest Energy Cosmic Rays

Shigeru Yoshida, Günter Sigl, and Sangjin Lee
Phys. Rev. Lett. 81, 5505 – Published 21 December 1998
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Abstract

Extremely high energy ( 1022eV) cosmic neutrino beams initiate high energy particle cascades in the background of relic neutrinos from the big bang. We perform numerical calculations to show that such cascades could contribute more than 10% to the observed cosmic ray flux above 3×1019eV if neutrinos have eV masses. The required intensity of primary neutrinos could be consistent with astrophysical models for their production if the maximum neutrino energy reaches to 1022eV and the massive neutrino dark matter is locally clustered. Future observations of ultrahigh energy cosmic rays will lead to an indirect but practical search for neutrino dark matter.

  • Received 14 August 1998

DOI:https://doi.org/10.1103/PhysRevLett.81.5505

©1998 American Physical Society

Authors & Affiliations

Shigeru Yoshida*

  • Institute for Cosmic Ray Research, University of Tokyo, Tanashi, Tokyo 188-8502, Japan

Günter Sigl and Sangjin Lee

  • Department of Physics and Astrophysics, Enrico Fermi Institute, The University of Chicago, Chicago, Illinois 60637-1433

  • *Electronic address: syoshida@icrr.u-tokyo.ac.jp

See Also

Mysterious Cosmic Rays

Phys. Rev. Focus 2, 33 (1998)

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Issue

Vol. 81, Iss. 25 — 21 December 1998

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