Abstract
We discuss the contribution of proton photoproduction interactions in the isotropic infrared/optical background to the cosmic neutrino fluxes. This contribution has a strong dependence on the proton injection energy spectrum, and is essential at high redshifts. It is thus closely correlated with the cosmological evolution of the ultra-high energy proton sources and of the infrared background itself. These interactions may also contribute to the source fluxes of neutrinos if the proton sources are located in regions of high infrared emission and magnetic fields.
Highlights
We discuss the contribution of proton photoproduction interactions on the isotropic infrared/optical background to the cosmic neutrino fluxes
The assumption that the Ultra High Energy Cosmic Rays (UHECR) are nuclei accelerated in luminous extragalactic sources provides a natural connection between these particles and ultra high energy neutrinos
These so called cosmological neutrinos are produced in photoproduction interactions of the UHECR with the ambient photon fields, mostly with the microwave background radiation (MBR)
Summary
We discuss the contribution of proton photoproduction interactions on the isotropic infrared/optical background to the cosmic neutrino fluxes. These so called cosmological neutrinos are produced in photoproduction interactions of the UHECR with the ambient photon fields, mostly with the microwave background radiation (MBR). The main parameters that define the magnitude and the spectral shape of the cosmological neutrino fluxes are: the total UHECR source luminosity LCR, the shape of the UHECR injection spectrum αCR in the case of power law spectrum, the maximum UHECR energy at acceleration Emax and the cosmological evolution of the UHECR sources.
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