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We study the role of the effective Coulomb interaction strength and length onthe dynamics of nucleons in conditions according to those in a neutron star'scrust. Calculations were made with a semi-classical molecular dynamics model,studying isospin symmetric matter at sub-saturation densities and lowtemperatures. The electrostatic interaction between protons interaction isincluded in the form of a screened Coulomb potential in the spirit of theThomas-Fermi approximation, but the screening length is artificially varied toexplore its effect on the formation of the non-homogeneous nuclear structuresknown as "nuclear pasta". As the screening length increases, we can atransition from a one-per-cell pasta regime (due exclusively to finite sizeeffects) to a more appealing multiple pasta per simulation box. This showsqualitative difference in the structure of neutron star matter at lowtemperatures, and therefore, special caution should be taken when the screeninglength is estimated for numerical simulations.

Effect of Coulomb Screening Length on Nuclear Pasta Simulations