Molecular Dynamics Simulation of Shear Moduli for Coulomb Crystals
C. J. Horowitz, J. Hughto
TL;DR
This paper uses molecular dynamics simulations to calculate the shear modulus of Coulomb crystals in neutron star crusts, accounting for electron screening effects, and discusses potential extensions to include impurities and polycrystalline structures.
Contribution
The study provides new molecular dynamics simulation results for the shear modulus of Coulomb crystals, including electron screening effects, improving upon previous models.
Findings
Electron screening reduces shear modulus by about 10%.
MD simulations enable extensions to impurity and polycrystalline effects.
Results improve understanding of neutron star crust oscillations.
Abstract
Torsional (shear) oscillations of neutron stars may have been observed in quasiperiodic oscillations of Magnetar Giant Flares. The frequencies of these modes depend on the shear modulus of neutron star crust. We calculate the shear modulus of Coulomb crystals from molecular dynamics simulations. We find that electron screening reduces the shear modulus by about 10% compared to previous Ogata et al. results. Our MD simulations can be extended to calculate the effects of impurities and or polycrystalline structures on the shear modulus.
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Taxonomy
TopicsAdvanced ceramic materials synthesis · Microstructure and mechanical properties · Microstructure and Mechanical Properties of Steels