Diffuse Boosted Cosmic Neutrino Background
Gonzalo Herrera, Shunsaku Horiuchi, Xiaolin Qi

TL;DR
This paper calculates the flux of high-energy cosmic relic neutrinos boosted by cosmic rays, analyzes their detectability, and constrains the cosmic neutrino background density based on current experimental non-observations.
Contribution
It provides the first detailed calculation of the diffuse boosted relic neutrino flux considering different cosmic-ray models and discusses implications for future neutrino detection.
Findings
Current experiments exclude neutrino overdensities > 10^4
The diffuse flux depends on cosmic-ray spectral slope and evolution
Future detectors may observe boosted relic neutrinos if overdensities are high
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 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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Taxonomy
TopicsDark Matter and Cosmic Phenomena · Neutrino Physics Research · Astrophysics and Cosmic Phenomena
