Are there photons at the highest energies?

In a recent review article current searches for ultra-high-energy (UHE) photons at the Pierre Auger Observatory were summarized.

Where do the most energetic particles in the universe come from?

This looks like the most natural question regarding ultra-high energy cosmic rays, but it’s also one of the hardest ones to be answered.

What is dark matter made of? The latest data of the Pierre Auger Observatory constrains scenarios of super-heavy particle relics.

Dark matter could have been created in the primordial universe from gravitational interactions between all forms of matter.

Testing effects of Lorentz invariance violation in the propagation of astroparticles with the Pierre Auger Observatory

The possibility of some level of Lorentz invariance violation at very-high energies has been proposed in the context of theories beyond the Standard Model, quantum gravity and string theory.

Artificial Intelligence meets Physics: Deep-Learning based Reconstruction of the Shower Maximum

The Pierre Auger Collaboration recently introduced a deep-learning-based method to reconstruct the depth of maximum air shower profiles

The energy spectrum of cosmic rays beyond the turn-down around 10^17 eV

Recently, the Pierre Auger collaboration presented a measurement of the cosmic ray spectrum near the feature known as the "second knee".

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