Non Bunch Davies group coherent states, and their quantum signatures in
  CMB observables
  We approach the problem of finding generalized states for matter fields in a
de Sitter universe, moving from a group theoretical point of view. This has
profound consequences for cosmological perturbations during inflation, and for
other CMB observables. In a systematic derivation, we find all the allowed
generalities that such a state may have, within the requirements of coherent
states. Furthermore, we show their relation to the more familiar excited
initial states, often used in inflation.
