Polarized initial states of primordial gravitational waves
  Polarizations of primordial gravitational waves can be relevant when
considering inflationary universe in modified gravity or when matter fields
survive during inflation. Such polarizations have been discussed in the
Bunch-Davies vacuum. Instead of taking into account dynamical generation of
polarizations of gravitational waves, in this paper, we consider polarized
initial states constructed from $SU(2)$ coherent states. We then evaluate the
power spectrums of the primordial gravitational waves in the states.
