Humboldt-Universität zu Berlin - Faculty of Mathematics and Natural Sciences - Cosmos


Bullet Cluster

Current measurements indicate that the cosmos had its origin about 13,7 billion of years ago, out of a singularity in which the whole universe was compressed to a single point of infinite density and temperature, smaller than a single atom.  This singularity cannot be physically described with current knowledge.  The prevailing theory that explains the early development of the universe out of this singularity is commonly called The Big Bang.  There is evidence that shows that the universe continuously expands, and actually it is this expansion that is currently accelerating.

After a large number of measurements we have a deep knowledge about the 'ingredients' of the universe but there are still a lot of pieces of information we do not know or have not yet understood.  In particular, only about 4% of the universe consists of the so called visible matter, the material that all of us, the world, stars, atoms and everything we can see is composed of.  But the composition of the universe is dominated by 23% of the so-called Dark Matter and 73% of Dark Energy.  Dark Matter has only been detected by its gravitational interaction, and it seems that it does not consist of the particles known to us so far.  Dark Energy is probably the reason for the expansion of the universe, but it does not fit into our current knowledge of elementary interactions.

Scientists working in particle physics, astronomy, astrophysics and cosmology combine their research efforts in order to find out more about the mysteries of the universe. For this, large particle and astroparticle physics experiments have assumed a crucial role. The Elementary Particle Physics groups of Humboldt University Berlin participate in collider experiments (ATLAS at CERN), in gamma-ray astronomy with Cherenkov-Telescopes (H.E.S.S. in Namibia and the next generation installation CTA) and in neutrino detectors (IceCube at the South Pole).

Cosmos | Supernovae | Pulsars | Galaxies | Cosmic Rays | γ-Astronomy