Low lying modes of triplet-condensed neutron matter and their effective theory

Abstract

The condensation of neutrons into a ${}^{3}{P}_{2}$ superfluid phase occurs at densities relevant for the interior of neutron stars. The triplet pairing breaks rotational symmetry spontaneously and leads to the existence of gapless modes (angulons) that are relevant for many transport coefficients and to the star's cooling properties. We derive the leading terms of the low-energy effective field theory, including the leading coupling to electroweak currents, valid for a variety of possible ${}^{3}{P}_{2}$ phases.