Pairing in pure neutron matter

Abstract

We review the long standing problem of superfluid pairing in pure neutron matter. For the s-wave pairing, we summarize the state of the art of many-body approaches including different nn interactions, medium polarization, short-range correlations and BCS-BEC crossover effects, and compare them with quantum Monte Carlo results at low-densities. We also address pairing in the p-wave, which appears at higher densities and hence has large uncertainties due to the poorly constrained interactions, medium effects and many-body forces.

Neutron Stars and the Nuclear Equation of State

“…The situation is even worse for the gap in the n3P2 channel, which already on the BCS level depends on the NN potential [292,568,570,588,592,593], as at high density there is no constraint by the NN phase shifts. Furthermore TBF act generally attractive in this channel, but effective mass and quasiparticle strength reduce the gap and polarization effects on V might be of both signs, in particular in asymmetric beta-stable matter [571,578,585,588,[594][595][596][597]. Note that most theoretical investigations consider only pure neutron matter.…”