Sources of high-energy astrophysical neutrinos
Neutrinos (nearly massless particles that pass through matter almost untouched) arrive from space with energies from about $10^{13}$ eV to about $2 \times 10^{17}$ eV. Only a few sources have been identified, and most of the flux has no known origin.
Why it matters
Neutrinos travel in straight lines from where cosmic rays collide with matter or light, so they point back to the accelerators.
Review
M. Ahlers, F. Halzen, Opening a new window onto the universe with IceCube, Progress in Particle and Nuclear Physics, 2018. https://doi.org/10.1016/j.ppnp.2018.05.001 reference checked
Editors' decisions
- Accept of version 2, , on 2026-10-15. Decision record
Timestamp record
- Signed record
- 05faf7b2786d…
- Public log
- Entry 41, in checkpoint 2,123
- In the log by
- Block 969,698, 2026-10-03
This text was in the PubPhys log by that date. The date says nothing about when the problem was first posed.