Seminarium Fizyki Wielkich Energii

Even though the first UHECR was detected almost 60 years ago, the origin of these particles remains a mystery. For lower energies, their paths are twisted by the Galactic magnetic field, while for higher energies their fluxes are extremely low. That makes identifying the sources unreachable even for the largest existing observatories, that occupy hundreds to thousands of square kilometres.The problem of the low flux can be solved with building observatories that observe orders of magnitude larger volume of the atmosphere than the current ones. In addition, looking not directly at UHECR, but at neutrinos generated by them close to the source, can eliminate the influence of cosmic magnetic fields. These two ideas will be incorporated into the Giant Radio Array for Neutrino Detection (GRAND) - a future experiment to detect Earth-skimming neutrinos with huge arrays of cheap radio antennas.The contents of the seminar will include the idea behind the radio detection of UHE CRs and neutrinos, current status of GRAND prototypes, the role of the Polish group and the experimental challenges that we are facing.