Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The van der Waals energy of atomic systems near absorbing and dispersing
  bodies   Within the frame of macroscopic quantum electrodynamics in causal media, the
van der Waals interaction between an atomic system and an arbitrary arrangement
of dispersing and absorbing dielectric bodies including metals is studied. It
is shown that the minimal-coupling scheme and the multipolar-coupling scheme
lead to essentially the same formula for the van der Waals potential. As an
application, the vdW potential of an atom in the presence of a sphere is
derived. Closed expressions for the long-distance (retardation) and
short-distance (non-retardation) limits are given, and the effect of material
absorption is discussed.

35
The categories of this paper are: mtrl-th
3
The categories of this paper are: physics
2
The categories of this paper are: math
26
The categories of this paper are: bayes-an
17
The categories of this paper are: q-fin
32
The categories of this paper are: atom-ph
27
The categories of this paper are: comp-gas
16
The categories of this paper are: stat
4
The categories of this paper are: cond-mat
37
The categories of this paper are: supr-con
11
The categories of this paper are: hep-lat
23
The categories of this paper are: solv-int
33
The categories of this paper are: plasm-ph
22
The categories of this paper are: chao-dyn
9
The categories of this paper are: nlin
25
The categories of this paper are: patt-sol