The High Energy Astroparticle Physics Frontier

Astroparticle Physics explores the connections between the inner-space of elementary particles and the outer-space properties of the Universe.The last decade has witnessed great progress in understanding the origin of extremely energetic particles and defining the unknown components of the Universe. We will review the recent developments in theory and observations of the highest energy cosmic rays, photons, and neutrinos, their dark matter connections, and conclude with the outlook for the future of the field.