Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Scale Dependence of the Retarded van der Waals Potential   We study the ground state energy for a system of two hydrogen atoms coupled
to the quantized Maxwell field in the limit $\alpha \to 0$ together with the
relative distance between the atoms increasing as $\alpha^{-\gamma} R$, $\gamma
> 0$. In particular we determine explicitly the crossover function from the
$R^{-6}$ van der Waals potential to the $R^{-7}$ retarded van der Waals
potential, which takes place at scale $\alpha^{-2} R$.

12
The categories of this paper are: nucl-th
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The categories of this paper are: stat
26
The categories of this paper are: bayes-an
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The categories of this paper are: patt-sol
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The categories of this paper are: econ
31
The categories of this paper are: ao-sci
29
The categories of this paper are: funct-an
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The categories of this paper are: nlin
0
The categories of this paper are: hep-ph
37
The categories of this paper are: supr-con
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The categories of this paper are: plasm-ph
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The categories of this paper are: comp-gas
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The categories of this paper are: mtrl-th
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The categories of this paper are: hep-lat
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The categories of this paper are: gr-qc
36
The categories of this paper are: cmp-lg