Abstract
We use the Kubo-Theory to derive a correlation-function formula for the local susceptibility of a dielectric with regard to the internal fluctuating electro-magnetic fields in matter. The hamiltonian of the coupled system of field and matter is rewritten into a form, that it includes only operators which relate to volume elements with many atoms. The interaction between different volume elements and with it spatial dispersion is neglected. The possible energy levels in each volume element are approximated by an Oszillator model. The difference between the local susceptibility and the response function to an external field, which is calculated in the usual Kubo-Theory, is shown.
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