Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Comment on ''Inverse Doppler shift and control field as coherence
  generators for the stability in superluminal light''   In their study of inverse Doppler shift and superluminal light [Phys. Rev. A
91, 053807 (2015)], Ghafoor et al. consider a three-level atomic arrangement
with transitions in the optical domain. In fact, the values they give to the
parameters lead to a probe wavelength lying in the decimeter band. We point out
that the Doppler shifts are then negligible and remark that the simulations
performed by Ghafoor et al. do not evidence any superluminal effect.

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The categories of this paper are: q-fin
6
The categories of this paper are: astro-ph
4
The categories of this paper are: cond-mat
33
The categories of this paper are: plasm-ph
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The categories of this paper are: econ
10
The categories of this paper are: q-bio
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The categories of this paper are: hep-lat
35
The categories of this paper are: mtrl-th
27
The categories of this paper are: comp-gas
1
The categories of this paper are: cs
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The categories of this paper are: bayes-an
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The categories of this paper are: solv-int
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The categories of this paper are: stat
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The categories of this paper are: acc-phys
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The categories of this paper are: dg-ga
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The categories of this paper are: chem-ph