Shear viscosity and thermal conductivity of nuclear pasta

We calculate the shear viscosity eta and thermal conductivity kappa of a nuclear pasta phase in neutron star crusts. This involves complex nonspherical shapes. We use semiclassical molecular dynamics simulations involving 40,000 to 100,000 nucleons. The viscosity eta can be simply expressed in terms of the height Z* and width Delta q of the peak in the static structure factor S-p(q). We find that eta increases somewhat, compared to a lower density phase involving spherical nuclei, because Z* decreases from form factor and ion screening effects. However, we do not find a dramatic increase in eta from nonspherical shapes, as may occur in conventional complex fluids.