Deformed crystals and torsional oscillations of neutron star crust
arXiv:2009.04952 · doi:10.1093/mnras/staa2715
Abstract
We study breaking stress of deformed Coulomb crystals in a neutron star crust, taking into account electron plasma screening of ion-ion interaction; calculated breaking stress is fitted as a function of electron screening parameter. We apply the results for analyzing torsional oscillation modes in the crust of a non-magnetic star. We present exact analytic expression for the fundamental frequencies of such oscillations and show that the frequencies of all torsional oscillations are insensitive to the presence of the outer neutron star crust. The results can be useful in theoretical modeling of processes involving deformed Coulomb crystals in the crust of neutron stars, such as magnetic field evolution, torsional crustal or thermo-elastic quasi-periodic oscillations of flaring soft gamma-ray repeaters, pulsar glitches. The applicability of the results to soft gamma-ray repeaters is discussed.
11 pages, 6 figures, Accepted by MNRAS
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- Electrostatic energy of Coulomb crystals with polarized electron background
- Premerger phenomena in neutron-star binary coalescences
- Neutron star inner crust: reduction of shear modulus by nuclei finite size effect
- Nuclear pasta structures at high temperatures
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- Zeeman splitting of torsional oscillation frequencies of magnetars
- Powerful flares and magneto-elastic oscillations of magnetars
- Breaking properties of multicomponent neutron star crust
- Constraining shear modulus of polycrystalline neutron star crust: Hashin-Shtrikman variational approach
- Zeeman effect in oscillations of magnetars with toroidal magnetic fields