What are the cosmic sources of high-energy gamma rays?
How and where are cosmic particles accelerated?
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

Which extensions are required for the Standard Model of elementary particle physics?
Why is there practically no antimatter in the Universe?
How can the fundamental forces of nature be unified?
The Search for New Physics