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Title: Relic neutrinos, monopoles, and cosmic rays above {approx}10{sup 20} eV

Abstract

The observation of cosmic ray events above the Greisen-Kuzmin-Zatsepin (GZK) cut-off of 5x10{sup 19} eV offers an enormous opportunity for the discovery of new physics. We explore two possible origins for these super-GZK events. The first example uses Standard Model (SM) physics augmented only by < or approx. eV neutrino masses as suggested by solar, atmospheric, and terrestrial neutrino detection, and by the cosmological need for a hot dark matter component. In this example, cosmic ray neutrinos from distant, highest energy sources annihilate relatively nearby on the relic neutrino background to produce 'Z-bursts', highly collimated, highly boosted ({gamma}{sub Z}{approx}10{sup 11}) hadronic jets. The SM and hot Big Bang cosmology give the probability for each neutrino flavor at its resonant energy to annihilate within the halo of our galactic supercluster as likely within an order of magnitude of 1%. The kinematics are completely determined by the neutrino masses and the properties of the Z boson. The burst energy is E{sub R}=4 (eV/m{sub {nu}})x10{sup 21} eV, and the burst content includes, on average, thirty photons and 2.7 nucleons with super-GZK energies. The second example goes beyond SM physics to invoke relativistic magnetic monopoles as the cosmic ray primaries. Motivations for this hypothesismore » are twofold: (i) conventional primaries are problematic, while monopoles are naturally accelerated to E{approx}10{sup 20} eV by galactic magnetic fields; (ii) the observed highest energy cosmic ray flux is just a few orders of magnitude below the Parker flux limit for monopoles. By matching the cosmic monopole production mechanism to the observed highest energy cosmic ray flux we estimate the monopole mass to be < or approx. 10{sup 10} GeV. Several tests of the neutrino annihilation and monopole hypotheses are indicated.« less

Authors:
 [1]
  1. Department of Physics and Astronomy, Vanderbilt University, Nashville Tennessee 37235 (United States)
Publication Date:
OSTI Identifier:
21199246
Resource Type:
Journal Article
Journal Name:
AIP Conference Proceedings
Additional Journal Information:
Journal Volume: 433; Journal Issue: 1; Conference: Workshop on observing giant cosmic ray air showers from >10{sup 20} eV particles from space, College Park, MD (United States), 13-15 Nov 1997; Other Information: DOI: 10.1063/1.56143; (c) 1998 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0094-243X
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; ANNIHILATION; BACKGROUND RADIATION; COSMIC NEUTRINOS; COSMIC RAY FLUX; COSMOLOGY; EEV RANGE; ENERGY SPECTRA; FLAVOR MODEL; GEV RANGE; MAGNETIC FIELDS; MAGNETIC MONOPOLES; NEUTRINO DETECTION; NONLUMINOUS MATTER; NUCLEONS; REST MASS; STANDARD MODEL; Z NEUTRAL BOSONS

Citation Formats

Weiler, Thomas J. Relic neutrinos, monopoles, and cosmic rays above {approx}10{sup 20} eV. United States: N. p., 1998. Web. doi:10.1063/1.56143.
Weiler, Thomas J. Relic neutrinos, monopoles, and cosmic rays above {approx}10{sup 20} eV. United States. https://doi.org/10.1063/1.56143
Weiler, Thomas J. Mon . "Relic neutrinos, monopoles, and cosmic rays above {approx}10{sup 20} eV". United States. https://doi.org/10.1063/1.56143.
@article{osti_21199246,
title = {Relic neutrinos, monopoles, and cosmic rays above {approx}10{sup 20} eV},
author = {Weiler, Thomas J},
abstractNote = {The observation of cosmic ray events above the Greisen-Kuzmin-Zatsepin (GZK) cut-off of 5x10{sup 19} eV offers an enormous opportunity for the discovery of new physics. We explore two possible origins for these super-GZK events. The first example uses Standard Model (SM) physics augmented only by < or approx. eV neutrino masses as suggested by solar, atmospheric, and terrestrial neutrino detection, and by the cosmological need for a hot dark matter component. In this example, cosmic ray neutrinos from distant, highest energy sources annihilate relatively nearby on the relic neutrino background to produce 'Z-bursts', highly collimated, highly boosted ({gamma}{sub Z}{approx}10{sup 11}) hadronic jets. The SM and hot Big Bang cosmology give the probability for each neutrino flavor at its resonant energy to annihilate within the halo of our galactic supercluster as likely within an order of magnitude of 1%. The kinematics are completely determined by the neutrino masses and the properties of the Z boson. The burst energy is E{sub R}=4 (eV/m{sub {nu}})x10{sup 21} eV, and the burst content includes, on average, thirty photons and 2.7 nucleons with super-GZK energies. The second example goes beyond SM physics to invoke relativistic magnetic monopoles as the cosmic ray primaries. Motivations for this hypothesis are twofold: (i) conventional primaries are problematic, while monopoles are naturally accelerated to E{approx}10{sup 20} eV by galactic magnetic fields; (ii) the observed highest energy cosmic ray flux is just a few orders of magnitude below the Parker flux limit for monopoles. By matching the cosmic monopole production mechanism to the observed highest energy cosmic ray flux we estimate the monopole mass to be < or approx. 10{sup 10} GeV. Several tests of the neutrino annihilation and monopole hypotheses are indicated.},
doi = {10.1063/1.56143},
url = {https://www.osti.gov/biblio/21199246}, journal = {AIP Conference Proceedings},
issn = {0094-243X},
number = 1,
volume = 433,
place = {United States},
year = {1998},
month = {6}
}