Relic neutrino background from cosmic-ray reservoirs

We compute the flux of relic neutrino background ( R ν B ) up-scattered by ultrahigh-energy (UHE) cosmic rays (CRs) in clusters that act as CR-reservoirs. The long trapping times of UHECRs make this flux larger than that of R ν B up-scattered by UHECRs on their way to Earth, which we also compute. W...

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Bibliographic Details
Published in:Physical review. D 2025-01, Vol.111 (2), Article 023023
Main Authors: De Marchi, Andrea Giovanni, Granelli, Alessandro, Nava, Jacopo, Sala, Filippo
Format: Article
Language:English
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Summary:We compute the flux of relic neutrino background ( R ν B ) up-scattered by ultrahigh-energy (UHE) cosmic rays (CRs) in clusters that act as CR-reservoirs. The long trapping times of UHECRs make this flux larger than that of R ν B up-scattered by UHECRs on their way to Earth, which we also compute. We find that IceCube excludes R ν B weighted overdensities larger than 10 10 in clusters, and that PUEO, RNO-G, GRAND, and IceCube-Gen2 will test values down to 10 8 . Our treatment incorporates the momentum transfer dependence of the neutrino-nucleus cross section, deep inelastic scattering, a mixed UHECR composition, and flavor information on the up-scattered R ν B fluxes for both cases of neutrino mass spectrum with normal and inverted ordering, providing new handles to possibly disentangle the up-scattered R ν B from cosmogenic neutrinos.
ISSN:2470-0010
2470-0029
DOI:10.1103/PhysRevD.111.023023