During August 21-26, I delivered four lectures on multi-messenger astrophysics at the 2023 Invisibles School in Bad Honnef, Germany.

The three sets of lecture slides are here:

Slides I (pdf): Introduction and ultra-high-energy cosmic rays

Slides II (pdf): High-energy cosmic neutrinos: introduction and astrophysical aspects

Slides III (pdf): High-energy cosmic neutrinos: particle-physics aspects