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Triplet paring in neutron matter

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arxiv 2305.07096 v3 pith:E4IWC6F5 submitted 2023-05-11 nucl-th

classification nucl-th
keywords pairingdiagramsneutronsuggesttripletcalculationsmatterpresence
verification ladder T0 review T1 audit T2 compute T3 formal
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abstract

The presence of superfluidity in neutron star interiors can affect the cooling of neutron stars in intricate ways, enhancing certain mechanisms and suppressing others. Model calculations employing realistic nuclear potentials in Bardeen-Cooper-Schrieffer theory generally suggest the development of a $^3$P$_2$-$^3$F$_2$ pairing gap, and therefore the presence of superfluidity in dense neutron-star matter.Improved models that go beyond conventional mean-field calculations by including polarization effects suggest a suppression of the triplet gap. We have evaluated the pairing interaction by summing the ``parquet'' Feynman diagrams which include both ladder and ring diagrams systematically, {\em plus\} a set of important non-parquet diagrams, making this the most comprehensive diagram-based approach presently available. Our results suggest a radical suppression of the $^3$P$_2$-$^3$F$_2$ triplet pairing gap and an enhancement of $^3$P$_0$ pairing.

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