Probing Feedback in Galaxy Formation with Millimeter-wave Observations
  Achieving a precise understanding of galaxy formation in a cosmological
context is one of the great challenges in theoretical astrophysics, due to the
vast range of spatial scales involved in the relevant physical processes.
Observations in the millimeter bands, particularly those using the cosmic
microwave background (CMB) radiation as a "backlight", provide a unique probe
of the thermodynamics of these processes, with the capability to directly
measure the density, pressure, and temperature of ionized gas. Moreover, these
observations have uniquely high sensitivity into the outskirts of the halos of
galaxies and clusters, including systems at high redshift. In the next decade,
the combination of large spectroscopic and photometric optical galaxy surveys
and wide-field, low-noise CMB surveys will transform our understanding of
galaxy formation via these probes.
