Abstract
The complete spectrum of collective modes of the triplet order parameter in the superfluid neutron matter is examined in the BCS approximation below the pair-breaking threshold. The dispersion equations both for the unitary and nonunitary excitations are derived and solved in the limit of by taking into account the anisotropy of the energy gap for the case of -wave pairing. By our analysis, there is only one Goldstone mode which is associated with the broken gauge symmetry. We found no additional Goldstone modes associated with the broken rotational symmetry but found that the oscillations of the total angular momentum are qualitatively similar to the “normal-flapping” mode in the A phase of superfluid helium. There are also two collective modes associated with internal vibrations of the structure of the order parameter oscillating with and .
- Received 18 April 2012
DOI:https://doi.org/10.1103/PhysRevC.85.065502
©2012 American Physical Society