Shortly after their birth galaxies go through a growth spurt doubling their mass on average every 150 million years. Understanding the impact of this phase on the physical properties of galaxies and their environment is one of the questions we are investigating in my group.

Dark matter haloes hosting galaxies are strongly affected by the in- and out-flow of gas. In series of numerical simulations we show that during the cosmic evolution of galaxies inflow phases of gas go along with star burst and an increase in the amount of dark matter in the inner parts of dark matter haloes. Subsequent outflows of gas driven by exploding supernovae on the contrary lower the amount of dark matter in the centres.