Microscopic DFT+QRPA calculation shows the effective coupling constant between nuclear clusters and superfluid phonons in the neutron-star inner crust is substantially smaller than hydrodynamical estimates due to suppression of the phonon amplitude inside and around the clusters.
Dynamics of the inner crust of neutron stars: hydrodynamics, elasticity and collective modes
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abstract
We present calculations of the hydrodynamics of the inner crust of neutron stars, where a superfluid neutron liquid coexists with a lattice of neutron-rich nuclei. The long-wavelength collective oscillations are combinations of phonons in the lattice and phonons in the superfluid neutrons. Velocities of collective modes are calculated from information about effective nucleon-nucleon interactions derived from Lattimer and Swesty's microscopic calculations based on a compressible liquid drop picture of the atomic nuclei and the surrounding neutrons.
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Dark matter admixed neutron stars show up to 12% thinner crusts and higher torsional oscillation frequencies than pure neutron stars when dark matter forms a core, with analytical formulas matching numerics at sub-percent level.
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Interaction between nuclear clusters and superfluid phonons in the neutron-star inner crust
Microscopic DFT+QRPA calculation shows the effective coupling constant between nuclear clusters and superfluid phonons in the neutron-star inner crust is substantially smaller than hydrodynamical estimates due to suppression of the phonon amplitude inside and around the clusters.
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The crust of dark-matter admixed neutron stars: bulk properties and torsional oscillations
Dark matter admixed neutron stars show up to 12% thinner crusts and higher torsional oscillation frequencies than pure neutron stars when dark matter forms a core, with analytical formulas matching numerics at sub-percent level.