Abstract
A method previously introduced to evaluate the far zone part (Casimir - Polder) of the non-additive van der Waals interaction between three ground-state isotropic non-overlapping atoms or molecules is extended to arbitrary separation of the sources. The results obtained are valid for arbitrary geometrical configurations of the three sources. In this method the non-additive van der Waals potential is obtained as the classical interaction energy between the dipole moments of two of the three atoms; these dipole moments are induced and correlated by the spatially correlated zero-point vacuum fluctuations, `dressed' by the presence of the third atom. This method, in addition, yields a new physical interpretation of the three-body forces, which throws light on the role of dressed vacuum field correlations.
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