Quantum Field Theory of the Van Der Waals Friction
نویسندگان
چکیده
The van der Waals friction between two semi-infinite solids, a small neutral particle and semi-infinite solid is reconsidered on the basis of thermal quantum field theory in Matsubara formulation. The friction calculated in this approach is in agreement with the friction calculated in the framework of dynamical modification of the Lifshitz theory with use of the fluctuation-dissipation theorem. This solves the problem about the applicability of the Lifshitz theory to the dynamical situation. In quantum field theory the calculation of the friction to linear order in the sliding velocity is reduced to the finding of the equilibrium Green functions. Thus this approach can be extended for bodies with complex geometry. We show that the van der Waals friction can be measured in non-contact friction experiment using state-of-the-art equipment.
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