High-density triplet neutron pairing

Determine whether the coupled $^3P_2$--$^3F_2$ neutron condensate survives strong medium suppression at neutron-star core densities and identify which magnetic substate or mixture of substates is realized.

Background

The review identifies high-density neutron triplet pairing as the least certain standard nucleonic pairing channel. Uncertainties arise from poorly constrained high-momentum nucleon–nucleon interactions, medium suppression, and near-degeneracy among competing order-parameter phases.

References

The triplet gap remains one of the central open problems in the microphysics of neutron-star interiors.

— Superfluidity and Vortex Dynamics in Neutron Stars  (2609.01022 - Link et al., 1 Sep 2026) in Section “Triplet neutron pairing at high density”