Vortex lattice in rotating neutron spin-triplet superfluid

TL;DR

This paper investigates a non-singular vortex lattice in rotating neutron spin-triplet superfluids, showing it is energetically favorable and impacts neutron star superfluid dynamics.

Contribution

It introduces a model of non-singular vortex lattices in neutron superfluids and compares their energy to singular vortices, highlighting their stability and implications.

Findings

Non-singular vortices are energetically preferable in neutron star cores.

These vortices lack magnetization, affecting scattering and pinning.

The superfluid's hydrodynamics are influenced by the vortex structure.

Abstract

In the Ginzburg-Landau limit, a possible texture without singular cores in a rotating neutron spin-triplet superfluid is studied. It is constructed the lattice of non-singular vortices with a vorticity diffusely distributed over the entire unit cell. The upper limit of the free energy associated with this structure is estimated, and the result shows that non-singular vortices are more preferable in the core of rotating neutron stars than ordinary linear singular vortices. The order parameter of the studied neutron system belongs to the unitary class. This implies that the superfluid under consideration does not have spin polarization and the core-less $^{3}$P$_{2}$ vortices do not have magnetization, which makes electron scattering by vortices ineffective. For the same reason, pinning with flux tubes is also suppressed. This can affect the hydrodynamics of superfluid neutron stars.