Neutrinos as Source of Ultra High Energy Cosmic Rays in Extra Dimensions

Abstract

If the neutrinos are to be identified with the primary source of ultra-high energy cosmic rays(UHECR), their interaction on relic neutrinos is of great importance in understanding their long intergalactic journey. In theories with large compact dimensions, the exchange of a tower of massive spin-2 gravitons (Kaluza-Klein excitations) gives extra contribution to $\nu \bar{\nu }⟶f\bar{f}$ and $\gamma \gamma$ processes along with the opening of a new channel for the neutrinos to annihilate with the relic cosmic neutrino background $\nu \bar{\nu }⟶G_{kk}$ to produce bulk gravitons in the extra dimensions. This will affect their attenuation. We compute the contribution of these Kaluza-Klein excitations to the above processes and find that for parameters of the theory constrained by supernova cooling, the contribution does indeed become the dominant contribution above $\sqrt{s}\simeq 300$ GeV.

16 pages Latex2e file including 4 postscript figures. Effect of brane fluctuation taken into account

References in corpus (7)

• SN1987A Constraints on Large Compact Dimensions
• Astrophysical Constraints on Large Extra Dimensions
• Brane fluctuations and suppression of Kaluza-Klein mode couplings
• Extra dimensions and Strong Neutrino-Nucleon interactions above $10^{19}$ eV : Breaking the GZK Barrier
• Cosmological implications of a Relic Neutrino Asymmetry
• Unstable superheavy relic particles as a source of neutrinos responsible for the ultrahigh-energy cosmic rays
• Ultrahigh energy neutrino interactions and weak-scale string theories

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