Using observed precession periods and surface temperatures, the authors constrain the internal fields of four magnetars and two FRB hosts, finding toroidal field strengths of order 10^15 G and a toroidal distribution parameter beta greater than or similar to 1.
Triplet paring in neutron matter
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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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Revealing the internal magnetic field configuration of magnetars via their associated periodic signals
Using observed precession periods and surface temperatures, the authors constrain the internal fields of four magnetars and two FRB hosts, finding toroidal field strengths of order 10^15 G and a toroidal distribution parameter beta greater than or similar to 1.