The present white paper is submitted as part of the “Snowmass” process to help inform the
long-term plans of the United States Department of Energy and the National Science …

In this work we present the interpretation of the energy spectrum and mass composition data
as measured by the Pierre Auger Collaboration above 6× 1017 eV. We use an astrophysical …

Some Seyfert galaxies are detected in high-energy gamma rays, but the mechanism and site
of gamma-ray emission are unknown. Also, the origins of the cosmic high-energy neutrino …

We revisit constraints on decaying very heavy dark matter (VHDM) using the latest ultrahigh-
energy cosmic-ray (UHECR; E≳ 10 18 eV) data and ultrahigh-energy (UHE) γ-ray flux upper …

We test the hypothesis of starburst galaxies as sources of ultrahigh energy cosmic rays and
high energy neutrinos. The computation of interactions of ultrahigh energy cosmic rays in the …

In many models, the sources of ultrahigh-energy cosmic rays (UHECRs) are assumed to
accelerate particles to the same maximum energy. Motivated by the fact that candidate …

We consider the prospects for future ultrahigh energy cosmic ray and neutrino observations
to constrain the evolution of sources producing a proton flux above 10 EeV (1 EeV= 10 18 …

We use the surface detector of the Pierre Auger Observatory to search for air showers
initiated by photons with an energy above 1019 eV. Photons in the zenith angle range from …

We present a measurement of the momentum spectra of π±, K±, p±, Λ, Λ¯, and KS 0
produced in interactions of negatively charged pions with carbon nuclei at beam momenta of …

Interactions of ultra-high-energy cosmic rays (UHECRs) in the surroundings of their
accelerators can naturally explain the observed spectrum and composition of UHECRs …