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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.

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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.

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What is dark matter made of?

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

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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.

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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.

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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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