Post #2008527
2026-05-05 10:17 UTC
#paperday on #astroph
"The Impact of the Magnetised Cosmic Web on Ultra High Energy Cosmic Ray Propagation" by Allegra Firinu, myself and Carmelo Evoli.
We investigated the role of realistic extragalactic magnetic fields in deflecting E>1e18eV cosmic rays, effectively creating "an horizon" beyond which particles cannot reach us, as they are trapped by magnetic fields.
https://arxiv.org/abs/2605.02324
#cosmoMAG #astrophysics #astronomy #physics
Replies (1)
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@franco_vazza@mastodon.social 2026-05-05 10:20
The existence of a "Magnetic Horizon" has been surmised to make a sense of the strange sorting in composition of the highest energy UHECRs measured by the Pierre Auger Observatory, which is not predicted by standard acceleration models. But it could be explained if significant magnetic fields are affecting the propagation of 1e18eV particles more than of 1e20eV particles - which can happen because the deflection by magnetic fields scales as \propto E/B , where E=particle energy