Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Coherent and Semiclassical States of a Charged Particle in a Constant
  Electric Field   The method of integrals of motion is used to construct families of
generalized coherent states of a nonrelativistic spinless charged particle in a
constant electric field. Families of states, differing in the values of their
standard deviations at the initial time, are obtained. Depending on the initial
values of the standard deviations, and also on the electric field, it turns out
to be possible to identify some families with semiclassical states.

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The categories of this paper are: hep-th
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The categories of this paper are: gr-qc
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The categories of this paper are: nlin
35
The categories of this paper are: mtrl-th
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The categories of this paper are: cs
20
The categories of this paper are: acc-phys
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The categories of this paper are: stat
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The categories of this paper are: adap-org
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The categories of this paper are: cmp-lg
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The categories of this paper are: q-fin
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The categories of this paper are: nucl-ex
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The categories of this paper are: econ
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The categories of this paper are: ao-sci
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The categories of this paper are: hep-ex
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The categories of this paper are: comp-gas
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The categories of this paper are: astro-ph