Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Fluctuation-Electromagnetic Interaction between Rotating Nanoparticles.
  2.Relativistic Theory   We study the fluctuation electromagnetic interaction in a system of two
rotating electrically neutral nonmagnetic particles with allowance for
relativistic retardation effect. The particles are assumed to have different
temperatures being embedded into a heated vacuum background (photon gas).
Closed expressions for the free energy, frictional torque and the rate of heat
transfer are derived and compared to the known static results and those in the
electrostatic limit without retardation.

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The categories of this paper are: cmp-lg
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The categories of this paper are: nucl-ex
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The categories of this paper are: q-alg
8
The categories of this paper are: hep-ex
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The categories of this paper are: chem-ph
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The categories of this paper are: dg-ga
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The categories of this paper are: atom-ph
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The categories of this paper are: comp-gas
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The categories of this paper are: q-fin
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The categories of this paper are: hep-lat
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The categories of this paper are: econ
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The categories of this paper are: math
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The categories of this paper are: adap-org
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The categories of this paper are: supr-con
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The categories of this paper are: ao-sci
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The categories of this paper are: bayes-an