I will present different methods and theoretical models on the detection of the first stars, which play a crucial role in galaxy formation, but which have not yet been observed. The first stars, which are believed to be more massive than present-day stars, might be indirectly observable by the gravitational wave emission of the merger […]

In 1929 Edwin Hubble rocked the physics community with his announcement that the universe was expanding – characterized shortly thereafter by his eponymous constant. Nearly 80 years later the field of cosmology has advanced tremendously with the discoveries of the accelerated expansion of the universe and precision measurements of both the universe’s mass and energy […]

Recent measurements of the CMB confirm predictions of a period of inflation in the primordial Universe. We will give a pedagogical outline of the observational evidence and theoretical motivations for this phenomenon. Moreover, we will argue for a class of inflationary models that can be characterized in terms of geometry rather than potential energy, and […]

Galaxy groups are believed to be important sites of gas pre-processing in galaxies, which in turn impacts their stellar and morphological evolution. ¬†As groups accrete more galaxies, the groups themselves become increasingly poor in neutral atomic hydrogen (HI), and more cluster-like. ¬†Studies of compact groups suggest that gas processing through tidal interactions simultaneously depletes the […]

Physical cosmology studies our Universe, its origin, evolution and the laws governing it. In the last decades a concordance cosmological model and the concept of precision cosmology emerged. The concordance model successfully explains the most accurate cosmological measurements available to date.. Precision cosmology now seeks after shrinking all possible measurement error. The forward model approach […]