Modeling the formation and evolution
of galaxies has long been a challenge because of the dual requirements of
modeling large and small scales. Recent numerical work has demonstrated
that highly effective feedback from star formation (and AGN, although here I
will focus mostly on stars), can drive strong outflows and reproduce many of
the observed properties of galaxies. However, our understanding of
the physical processes behind that feedback is still unsettled. Here I
explore the dynamical impact of cosmic rays under the assumption that they are
efficiently generated in supernovae explosions and diffuse throughout the
galaxy, demonstrating that they can drive substantial outflows. I also
examine the impact of cosmic rays on the circumgalactic
medium and the structure of dwarf galaxies, showing that these are important
additional constraints on feedback properties.