Kolloquien

Kirchhoff-Institut für Physik, Otto-Haxel-Hörsaal
Friday 17:15

Cosmic Rays with energies beyond 10²⁰ eV are regularly observed by the Pierre Auger Observatory covering an area of 3000 km². They are known to be of extragalactic origin but despite enormous progress being made in recent years, Nature has not fully revealed their sources, yet. However, a simultaneous description of the observed energy spectrum, mass composition and arrival directions suggests powerful nearby Starburst Galaxies as a key contributor -- an observation that is independently supported by multi-messenger observations involving high energy photons and neutrinos. The enormous particle energies arriving at Earth can also be used to probe new particle and fundamental physics and a few examples will be presented.