Electrical Conductivity in the RF Module

Hey,

I have a question considering the setup of materials in the RF module. Comsol offers three different parameters to set up the materials in this module: the electrical conductivity, the relative permittivity and the relative permeability.

I want to simulate a nanodisk made of gold. Therefor, I read the scattering nanosphere model in the model library. In this model, the relative permittivity of the gold sphere is filled with the dielectric function of gold and the electrical conductivity is set to 0. It should be clear that the electrical conductivity of gold is not 0. What does that mean then? Is Comsol calculating the electrical conductivity then by itself using the dielectric function?

Best regards and thank you for your help.