Floor of cosmogenic neutrino fluxes above $10^{17}~$eV
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arXiv
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| Main Authors: | , , , , |
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| Format: | Preprint |
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2024
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| _version_ | 1866929236350074880 |
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| author | Berat, Corinne Condorelli, Antonio Deligny, Olivier Montanet, Francois Torres, Zoe |
| author_facet | Berat, Corinne Condorelli, Antonio Deligny, Olivier Montanet, Francois Torres, Zoe |
| contents | The search for neutrinos with energies greater than $10^{17}~$eV is being actively pursued. Although normalization of the dominant neutrino flux is highly uncertain, a floor level is guaranteed by the interactions of extragalactic cosmic rays with Milky Way gas. We estimate that this floor level gives an energy flux of $E^2ϕ_ν\simeq 10^{-13^{+0.5}_{-0.5}}~$GeV~cm$^{-2}$~sr$^{-1}$~s$^{-1}$ at $10^{18}~$eV, where uncertainties arise from the modeling of the gas distribution and the experimental determination of the mass composition of ultra-high-energy cosmic rays on Earth. Based on a minimal model of cosmic-ray production to explain the mass-discriminated energy spectra observed on Earth above $5{\times}10^{18}$~eV, we also present generic estimates of the neutrino fluxes expected from extragalactic production that generally exceed the aforementioned guaranteed floor. The prospects for detecting neutrinos above $10^{18}$~eV remain however challenging, unless proton acceleration to the highest energies is at play in a sub-dominant population of cosmic-ray sources or new physical phenomena are at work. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2402_04759 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Floor of cosmogenic neutrino fluxes above $10^{17}~$eV Berat, Corinne Condorelli, Antonio Deligny, Olivier Montanet, Francois Torres, Zoe High Energy Astrophysical Phenomena The search for neutrinos with energies greater than $10^{17}~$eV is being actively pursued. Although normalization of the dominant neutrino flux is highly uncertain, a floor level is guaranteed by the interactions of extragalactic cosmic rays with Milky Way gas. We estimate that this floor level gives an energy flux of $E^2ϕ_ν\simeq 10^{-13^{+0.5}_{-0.5}}~$GeV~cm$^{-2}$~sr$^{-1}$~s$^{-1}$ at $10^{18}~$eV, where uncertainties arise from the modeling of the gas distribution and the experimental determination of the mass composition of ultra-high-energy cosmic rays on Earth. Based on a minimal model of cosmic-ray production to explain the mass-discriminated energy spectra observed on Earth above $5{\times}10^{18}$~eV, we also present generic estimates of the neutrino fluxes expected from extragalactic production that generally exceed the aforementioned guaranteed floor. The prospects for detecting neutrinos above $10^{18}$~eV remain however challenging, unless proton acceleration to the highest energies is at play in a sub-dominant population of cosmic-ray sources or new physical phenomena are at work. |
| title | Floor of cosmogenic neutrino fluxes above $10^{17}~$eV |
| topic | High Energy Astrophysical Phenomena |
| url | https://arxiv.org/abs/2402.04759 |