Astroparticle Physics

What are the cosmic sources of high-energy gamma rays?
What are the sites of cosmic particle acceleration ?
What impact do relativistic particles have on astrophysical systems ?
The High-Energy Universe

What is the nature of Dark Matter and how can it be detected?
Are neutrinos their own antiparticles?
What ist their mass and how do they transform from one type into another? 
Invisible Particles

Wie lassen sich die fundamentalen Naturkräfte vereinigen?
Why is there practically no antimatter in the Universe? 
The Search for New Physics