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The shear modulus of neutron star matter is one of the important propertiesfor determining torsional oscillations in neutron stars. We take into accountthe effects of finite sizes of spherical nuclei on the shear modulus andexamine the frequencies of crustal torsional oscillations. The shear modulusdecreases owing to the finite-size effect, which in turn decreases thefrequencies of torsional oscillations. In particular, the finite-size effectbecomes more crucial for oscillations with a larger azimuthal quantum numberand for neutron star models with a weaker density dependence of nuclearsymmetry energy. In practice, when one identifies the quasi-periodicoscillations from a neutron star, where the magnetic effect is negligible, withcrustal torsional oscillations, the finite-size effect can be more significantat frequencies higher than $\sim 100$ Hz.

Effects of finite sizes of atomic nuclei on shear modulus and torsional oscillations in neutron stars