Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Large amplitude electromagnetic solitons in a fully relativistic
  magnetized electron-positron-pair plasma   Nonlinear propagation of purely stationary large amplitude electromagnetic
(EM) solitary waves in a magnetized electron-positron (EP) plasma is studied
using a fully relativistic two-fluid hydrodynamic model which accounts for
physical regimes of both weakly relativistic $(P\ll nmc^2)$ and
ultrarelativistic $(P\gg nmc^2)$ random thermal energies. Here, $P$ is the
thermal pressure, $n$ the number density and $m$ the mass of a particle, and
$c$ is the speed of light in vacuum. Previous theory in the literature [Phys.
Plasmas \textbf{11}, 3078 (2004)] is advanced and generalized by the
relativistic thermal motion of both electrons and positrons. While both the
sub-Alfv{\'e}nic and super-Alfv{\'e}nic solitons coexist in the weakly
relativistic regime, the ultrarelativistic EP plasmas in contrast support only
the sub-Alfv{\'e}nic solitons. Different limits of the Mach numbers and soliton
amplitudes are also examined in these two physical regimes.

29
The categories of this paper are: funct-an
20
The categories of this paper are: acc-phys
6
The categories of this paper are: astro-ph
14
The categories of this paper are: math-ph
4
The categories of this paper are: cond-mat
25
The categories of this paper are: patt-sol
8
The categories of this paper are: hep-ex
19
The categories of this paper are: eess
24
The categories of this paper are: dg-ga
11
The categories of this paper are: hep-lat
12
The categories of this paper are: nucl-th
31
The categories of this paper are: ao-sci
7
The categories of this paper are: hep-th
32
The categories of this paper are: atom-ph
21
The categories of this paper are: adap-org
30
The categories of this paper are: q-alg