Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Wave dispersion in pulsar plasma: 3. Beam-driven instabilities   Beam-driven instabilities are considered in a pulsar plasma assuming that
both the background plasma and the beam are relativistic J\"uttner
distributions. In the rest frame of the background, the only waves that can
satisfy the resonance condition are in a tiny range of slightly subluminal
phase speeds. The growth rate for the kinetic (or maser) version of the
weak-beam instability is much smaller than has been estimated for a
relativistically streaming Gaussian distribution, and the reasons for this are
discussed. The growth rate for the reactive version of the weak-beam
instability is treated in a conventional way. We compare the results with exact
calculations, and find that the approximate solutions are not consistent with
the exact results. We conclude that, for plausible parameters, there is no
reactive version of the instability. The growth rate in the pulsar frame is
smaller than that in the rest frame of the background plasma by a factor
$2\gamma_{\rm s}$, where $\gamma_{\rm s} = 10^2 {\rm -} 10^3$ is the Lorentz
factor of the bulk motion of the background plasma, placing a further
constraint on effective wave growth. Based on these results, we argue that
beam-driven wave growth probably plays no role in pulsar radio emission.

20
The categories of this paper are: acc-phys
35
The categories of this paper are: mtrl-th
23
The categories of this paper are: solv-int
36
The categories of this paper are: cmp-lg
10
The categories of this paper are: q-bio
22
The categories of this paper are: chao-dyn
8
The categories of this paper are: hep-ex
26
The categories of this paper are: bayes-an
24
The categories of this paper are: dg-ga
5
The categories of this paper are: gr-qc
33
The categories of this paper are: plasm-ph
29
The categories of this paper are: funct-an
1
The categories of this paper are: cs
37
The categories of this paper are: supr-con
27
The categories of this paper are: comp-gas
11
The categories of this paper are: hep-lat