Towards a metallurgy of neutron star crusts

Abstract

In the standard picture of the crust of a neutron star, matter there is simple: a body-centered-cubic (bcc) lattice of nuclei immersed in an essentially uniform electron gas. We show that at densities above that for neutron drip ($\sim 4\times 10^{1}1$) g cm${}^{-3}$ or roughly one thousandth of nuclear matter density, the interstitial neutrons give rise to an attractive interaction between nuclei that renders the lattice unstable. We argue that the likely equilibrium structure is similar to that in displacive ferroelectric materials such as BaTiO${}_3$. As a consequence, properties of matter in the inner crust are expected to be much richer than previously appreciated and we mention consequences for observable neutron star properties.

4 pages, 3 figures

References in corpus (6)

• The Breaking Strain of Neutron Star Crust and Gravitational Waves
• Neutron conduction in the inner crust of a neutron star in the framework of the band theory of solids
• Crustal Entrainment and Pulsar Glitches
• Forecasting neutron star temperatures: predictability and variability
• Low-energy collective excitations in the neutron star inner crust
• Structural Phase Transitions

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