Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Strongly Enhanced Stimulated Brillouin Backscattering in an
  Electron-Positron Plasma   Stimulated Brillouin backscattering of light is shown to be drastically
enhanced in electron-positron plasmas, in contrast to the suppression of
stimulated Raman scattering. A generalized theory of three-wave coupling
between electromagnetic and plasma waves in two-species plasmas with arbitrary
mass ratios, confirmed with a comprehensive set of particle-in-cell
simulations, reveals violations of commonly-held assumptions about the behavior
of electron-positron plasmas. Specifically, in the electron-positron limit
three-wave parametric interaction between light and the plasma acoustic wave
can occur, and the acoustic wave phase velocity differs from its usually
assumed value.

28
The categories of this paper are: alg-geom
37
The categories of this paper are: supr-con
0
The categories of this paper are: hep-ph
4
The categories of this paper are: cond-mat
19
The categories of this paper are: eess
32
The categories of this paper are: atom-ph
33
The categories of this paper are: plasm-ph
35
The categories of this paper are: mtrl-th
26
The categories of this paper are: bayes-an
15
The categories of this paper are: nucl-ex
1
The categories of this paper are: cs
27
The categories of this paper are: comp-gas
6
The categories of this paper are: astro-ph
7
The categories of this paper are: hep-th
2
The categories of this paper are: math
24
The categories of this paper are: dg-ga