Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Coherent Curvature Radiation and Proton Counterflow in the Pulsar
  Magnetosphere   In the proton counterflow model of a pulsar magnetosphere that we have
recently proposed, non-relativistic protons are supplied from the magnetosphere
to flow toward the pulsar surface and screen an electric field above the polar
cap region. In this Letter, we show that the proton counterflow is also
suitable for the bunching of pair plasma. The two-stream instability is easily
excited and can produce bunches of pairs with a relevant length scale to emit
coherent curvature radiation.

7
The categories of this paper are: hep-th
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The categories of this paper are: dg-ga
33
The categories of this paper are: plasm-ph
17
The categories of this paper are: q-fin
30
The categories of this paper are: q-alg
16
The categories of this paper are: stat
5
The categories of this paper are: gr-qc
11
The categories of this paper are: hep-lat
10
The categories of this paper are: q-bio
3
The categories of this paper are: physics
29
The categories of this paper are: funct-an
1
The categories of this paper are: cs
27
The categories of this paper are: comp-gas
28
The categories of this paper are: alg-geom
23
The categories of this paper are: solv-int
32
The categories of this paper are: atom-ph