Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A hydrodynamic model of Alfvenic waves and fast magneto-sound in the
  relativistically hot plasmas at propagation parallel to the magnetic field   The Alfvenic waves and fast magneto-sound in the relativistically hot plasmas
are considered. This study is based on the novel hydrodynamic model of plasmas
with the relativistic temperatures consisted of four equations for the material
fields: the concentration and the velocity field \emph{and} the average reverse
relativistic $\gamma$ functor and the flux of the reverse relativistic $\gamma$
functor. Three temperature regimes giving considerably different behavior of
the spectrum of Alfvenic waves are found. Four temperature regimes are obtained
for the fast magneto-sound. All these regimes show considerable variations from
the nonrelativistic regime. Dispersion equations for the electromagnetic
transverse wave propagating parallel to the external magnetic field are found
analytically. Their small frequency solutions are analyzed numerically.

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The categories of this paper are: bayes-an
31
The categories of this paper are: ao-sci
34
The categories of this paper are: chem-ph
17
The categories of this paper are: q-fin
37
The categories of this paper are: supr-con
9
The categories of this paper are: nlin
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The categories of this paper are: alg-geom
5
The categories of this paper are: gr-qc
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The categories of this paper are: acc-phys
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The categories of this paper are: q-bio
2
The categories of this paper are: math
13
The categories of this paper are: quant-ph
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The categories of this paper are: dg-ga
6
The categories of this paper are: astro-ph
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The categories of this paper are: solv-int
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The categories of this paper are: comp-gas