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arXiv · 2604.14535

Ultrahigh-energy cosmogenic neutrino emissions in the high-redshift universe

Shigeru Yoshida·Maximilian Meier
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Abstract

The James Webb Space Telescope (JWST) revealed a large population of active galactic nuclei (AGN) with redshifts greater than five. We show that if they emit ultrahigh-energy protons with energies up to $\lesssim 10^{19}$ eV, the cosmogenic neutrino production in the high-redshift CMB field yields a neutrino flux with a bump at around 50 PeV. This flux is potentially consistent with the current neutrino intensity estimate by the IceCube Neutrino Observatory within the parameter space allowed from the AGN luminosity and number density estimates by JWST. Future neutrino observations that confirm the 50-PeV bump and constrain the small-scale anisotropy will infer ultra-high energy cosmic-ray emissions in the early universe.

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Shigeru Yoshida, Maximilian Meier. 2026-04-16. Ultrahigh-energy cosmogenic neutrino emissions in the high-redshift universe. https://arxiv.org/abs/2604.14535

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