Elastic properties of multicomponent crystals in neutron stars and white dwarfs

Abstract

Elastic properties play an important role in neutron stars and white dwarfs. They are crucial for modeling stellar oscillations and different processes in magnetars and in degenerate stars which enter compact binary systems. Using electrostatic energy of deformed lattices, we calculate elastic moduli of ordered binary body-centered cubic (sc2) and face-centered cubic (fc2) lattices. We use two methods to determine the effective shear modulus ${\mu }_{\mathrm{eff}}$. We show that ${\mu }_{\mathrm{eff}}$ calculated as a Voigt average agrees with the results obtained from the linear mixing rule. For the sc2 lattice, our calculations are also consistent with the results of numerical simulations of disordered binary body-centered cubic lattice.

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Cited by in corpus (7)

• Neutron star crust in Voigt approximation: general symmetry of the stress-strain tensor and an universal estimate for the effective shear modulus
• Neutron star inner crust: reduction of shear modulus by nuclei finite size effect
• Elastic properties of nuclear pasta in a fully three-dimensional geometry
• Elastic properties of Yukawa crystals
• Neutron star crust in Voigt approximation II: general formula for electron screening correction for effective shear modulus
• Breaking properties of multicomponent neutron star crust
• Constraining shear modulus of polycrystalline neutron star crust: Hashin-Shtrikman variational approach