Constraints on metastable superheavy dark matter coupled to sterile neutrinos

One intriguing aspect of the Standard Model (SM) of particle physics is the absence of right-handed degrees of freedom to describe neutrinos ...


Beyond the 'Muon Puzzle'

Testing hadronic interaction models using hybrid data of the Pierre Auger Observatory


Space-based laser measured from Earth

An unusual collaboration leads to spectacular results.


Where do ultra-high-energy cosmic rays come from?

This is still an open question in astroparticle physics and a long-standing mystery that the Pierre Auger Observatory aims to solve.


Demonstrating Agreement between Radio and Fluorescence Measurements of the Depth of Maximum of Extensive Air Showers

Understanding the origin and nature of ultra-high energy cosmic rays has been one of the driving forces of the field of astroparticle physics. A key piece of information is what type of particles cosmic rays consist of.


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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