Lowest-Order Contributions to the Lattice Viscosity

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Abstract
The lowest-order contributions in a perturbation expansion of the correlation-function formula for lattice viscosity are obtained. All but one of the six contributions found are shown to be zero. It is indicated how the problem of evaluating this one nonzero contribution can be simplified to the problem of solving an integral equation which has the same collision operator as the familiar Boltzmann equation for phonons, but which has a different inhomogeneous term.