The retarded van der Waals potential - revisited

Details The retarded van der Waals potential - revisited The retarded van der Waals potential - revisited

2009-01-23

arxiv.org/abs/0901.3678v1

Physics

Mathematical Physics

26 pages

Scientific paper

The retarded van-der-Waals potential, as first obtained by Casimir and Polder, is usually computed on the basis of nonrelativistic QED. The hamiltonian describes two infinitely heavy nuclei, charge $e$, separated by a distance $R$ and two spinless electrons, charge $-e$, nonrelativistically coupled to the quantized radiation field. Casimir and Polder use the dipole approximation and small coupling to the Maxwell field. We employ here the full hamiltonian and determine the asymptotic strength of the leading $-R^{-7}$ potential, which is valid for all $e$. Our computation is based on a path integral representation and expands in $1/R$, rather than in $e$.

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