Theoretical Physics(DTP)
Physique théorique (DPT)

---

Rainer DICK
University of Saskatchewan

Theoretical Aspects of Ultra-High Energy Cosmic Rays

---

After a brief review of the experimental facts, I will outline theoretical attempts to explain the origin of ultra-high energy cosmic rays. This will focus on top-down models involving the decay or collisional annihilation of superheavy dark matter particles. These models can be identified and differentiated by their anisotropy signatures, and (contrary to a common prejudice) domination of photon primaries need not be a generic prediction of top-down models. I will also outline a possible connection to black holes.