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arXiv · 2405.14946

Diffuse Boosted Cosmic Neutrino Background

Gonzalo Herrera·Shunsaku Horiuchi·Xiaolin Qi
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Abstract

Energetic cosmic rays scatter off the cosmic neutrino background throughout the history of the Universe, yielding a diffuse flux of cosmic relic neutrinos boosted to high energies. We calculate this flux under different assumptions of the cosmic-ray flux spectral slope and redshift evolution. The non-observation of the diffuse flux of boosted relic neutrinos with current high-energy neutrino experiments already excludes an average cosmic neutrino background overdensity larger than $\sim 10^{4}$ over cosmological distances. We discuss the future detectability of the diffuse flux of boosted relic neutrinos in light of neutrino overdensity estimates and cosmogenic neutrino backgrounds.

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Gonzalo Herrera, Shunsaku Horiuchi, Xiaolin Qi. 2024-05-23. Diffuse Boosted Cosmic Neutrino Background. https://doi.org/10.1103/physrevd.111.063016

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