Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The influence of free neutrons on dynamics and radiation of
  astrophysical plasmas   We present arguments in favor of the presence of free neutrons in plasmas
generated by compact astrophysical objects and find conditions necessary for
the formation of the neutron component. The broad range of phenomena caused by
neutrons includes both dynamical (sources' variability, transition of fireballs
to the two-flow regime) and kinetic (fission of helium nuclei by neutrons,
electromagnetic cascade, emission in annihilation and nuclear lines, neutrino
losses) effects. The presented theory can be applied to internal regions of
accretion disks, jets in microquasars, and gamma-ray burst (GRB) fireballs.

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The categories of this paper are: patt-sol
3
The categories of this paper are: physics
24
The categories of this paper are: dg-ga
37
The categories of this paper are: supr-con
36
The categories of this paper are: cmp-lg
23
The categories of this paper are: solv-int
18
The categories of this paper are: econ
26
The categories of this paper are: bayes-an
30
The categories of this paper are: q-alg
7
The categories of this paper are: hep-th
11
The categories of this paper are: hep-lat
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The categories of this paper are: adap-org
15
The categories of this paper are: nucl-ex
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The categories of this paper are: q-fin
32
The categories of this paper are: atom-ph
5
The categories of this paper are: gr-qc