The field of ultrahigh energy cosmic rays (UHECRs) is at a turning point. The Pierre Auger Observatory has reported interesting data on the arrival directions and chemical composition of these particles, triggering further the curiosity of the high energy astrophysics community, but without revealing the holy grail: the origin of UHECRs. The neutrino observatory IceCube has finally started to observe high energy neutrinos, and this detection could lead to ground-breaking revelations on their primary particles, i.e. cosmic rays. The Cerenkov Telescope Array (CTA) will soon increase our sensitivity to gamma-rays, and deepen our knowledge on the highest energy sources. In parallel of further developing Auger and Telescope Array for better quality data, experimentalists are also considering a pioneer observatory: the satellite JEM-EUSO, which aims at detecting UHECRs from space. Much is to be done to prepare for such projects, both from experimental and theoretical points of view.

The discussion about the present status and any future plans requires to involve theorists and experimentalists working on various types of messengers (cosmic rays, neutrinos, photons), and at various energies and wavelengths. Our aim is to organize a workshop that is dedicated to discussions among active researchers in the field, especially led by emerging junior researchers.

The number of participants will be limited to 40. We will confirm your participation acceptance by the end of October 2013.