Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A theory of electromagnetic fluctuations for metallic surfaces and van
  der Waals interactions between metallic bodies   A new general expression is derived for the fluctuating electromagnetic field
outside a metal surface, in terms of its surface impedance. It provides a
generalization to real metals of Lifshitz theory of molecular interactions
between dielectric solids. The theory is used to compute the radiative heat
transfer between two parallel metal surfaces at different temperatures. It is
shown that a measurement of this quantity may provide an experimental
resolution of a long-standing controversy about the effect of thermal
corrections on the Casimir force between real metal plates.

21
The categories of this paper are: adap-org
5
The categories of this paper are: gr-qc
23
The categories of this paper are: solv-int
22
The categories of this paper are: chao-dyn
31
The categories of this paper are: ao-sci
9
The categories of this paper are: nlin
29
The categories of this paper are: funct-an
36
The categories of this paper are: cmp-lg
1
The categories of this paper are: cs
15
The categories of this paper are: nucl-ex
12
The categories of this paper are: nucl-th
18
The categories of this paper are: econ
33
The categories of this paper are: plasm-ph
35
The categories of this paper are: mtrl-th
26
The categories of this paper are: bayes-an
28
The categories of this paper are: alg-geom