First-principles point-defect calculations for solid neutron star matter

Formation enthalpies are calculated for a number of point-defect structures in solid neutron star matter at densities above the neutron-drip threshold . The enthalpies obtained show that an amorphous heterogeneous solid phase is formed at temperatures in a glass transition region, and is likely to pe rsist as the star cools. Its structural differences from the homogeneous bo dy-centred cubic lattice previously assumed make it necessary to reconsider predictions of neutron-star magnetic field evolution, and severely limit t he role of conventional superfluid neutron vortex pinning in the interpreta tion of pulsar glitch phenomena.