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Do black-hole mergers emit ultra-high energy photons?

For the first time, the possible appearance of ultra-high energy photons from merging compact objects such as black holes was tested.

What is the origin of ultra-high-energy cosmic rays?

The energy spectrum and mass composition data from the Pierre Auger Observatory constrain the source properties.

What is dark matter made of?

The latest data of the Pierre Auger Observatory constrains scenarios of super-heavy particle relics.

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.

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.

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