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We calculate the electric conductivity of a gas of relativistic particleswith isotropic cross sections using the Boltzmann equation as the startingpoint. Our analyses is restricted to elastic collisions. We show the perfectagreement with previously published numerical results for a massless quark-gluon plasma, and give results for the electric conductivity of an interactinghadron gas, employing realistic resonance cross sections. These results for theelectric conductivity of a hot hadron gas, as created in (ultra-)relativisticheavy-ion collisions, are of rich phenomenological as well as theoreticalinterest and can be compared to, e.g., lattice quantum field theorycalculations.

Electric Conductivity of a hot hadron gas from a kinetic approach