Massive and massless modes of the triplet phase of neutron matter
  Neutron matter at densities of the order of the nuclear saturation density is believed to have neutrons paired in the 3P2 channel. We study the low lying modes of this phase and find two massless modes (angulons), resulting from the spontaneous breaking of rotational symmetry as well as three other, gapped modes. We compute their masses at arbitrary temperatures. 
Paulo F. Bedaque, Amy N. Nicholson, Srimoyee Sen
nucl-th astro-ph.HE hep-ph