Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Ponderomotive Forces, Stokes Drift, and Momentum in Acoustic and
  Electromagnetic Waves   We reveal universal connections between three important phenomena in
classical wave physics: (i) the ponderomotive force acting on the medium
particles in an oscillatory wavefield, (ii) the Stokes drift of free medium
particles in a wave field, and (iii) the canonical wave momentum in a medium.
We analyse these phenomena for (a) longitudinal sound waves in a gas or fluid
and (b) transverse electromagnetic waves interacting with electrons in a plasma
or metal. In both cases, assuming quasi-monochromatic yet arbitrarily
inhomogeneous wavefields, the connections between the ponderomotive force,
Stokes drift velocity, kinetic energy, and canonical wave momentum carried by
the medium particles are given by the same simple expressions. This sheds light
on the nature of these phenomena, their fine interplay, and can be useful for
applications to dynamical transport phenomena in various types of waves.

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The categories of this paper are: comp-gas
14
The categories of this paper are: math-ph
37
The categories of this paper are: supr-con
6
The categories of this paper are: astro-ph
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The categories of this paper are: funct-an
22
The categories of this paper are: chao-dyn
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The categories of this paper are: q-fin
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The categories of this paper are: adap-org
16
The categories of this paper are: stat
5
The categories of this paper are: gr-qc
0
The categories of this paper are: hep-ph
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The categories of this paper are: hep-lat
12
The categories of this paper are: nucl-th
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The categories of this paper are: atom-ph
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The categories of this paper are: eess
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The categories of this paper are: q-bio