Nils convinced us that non-magnetic relativistic model is not good enough to describe torsional oscillations of NS. Improvement could be done by including crust-core coupling. His model uses relativistic multi-fluid equations of motion. He also includes elasticity of the fluids and the effect of magnetic field. His model depends on several aspects. For example, this model requires a detail understanding of the superfluid in the crust. Nils also need to know how smooth is the transition from the crust to the core. Another key ingredient is the vortex dynamics.
One of the main aspects Nils pointed out is the connection between the microphysics and the mesoscopic scale,e.g if you a particular nuclear pasta shape, how this would behave if its dimensions is of the order of cm.
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