1 research outputs found
Neutrinos as Source of Ultra High Energy Cosmic Rays in Extra Dimensions
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 and processes along with the opening
of a new channel for the neutrinos to annihilate with the relic cosmic neutrino
background 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 GeV.Comment: 16 pages Latex2e file including 4 postscript figures. Effect of brane
fluctuation taken into accoun