Abstract
The electrical and thermal conductivities are calculated in the weak coupling region within the half-filled-band Hubbard model. A derivation of the energy-current operator is given and the electron-phonon interaction is introduced into the model. Using a variational principle for the Boltzmann equation the average relaxation times are determined for both transport mechanisms. The results are compared with the resistance due to impurity scattering. For numerical purposes a combined density of states is established.
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