Surprises from extragalactic propagation of UHECRs

Understand

Ultra-high energy cosmic ray experimental data are now of very good statistical significance even in the region of the expected GZK feature.

• The identification of their sources requires sophisticate analysis of their propagation in the extragalactic space.
• When looking at the details of this propagation some unforeseen features emerge.
• We will discuss some of these "surprises".