Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Generation of wakefields and electromagnetic solitons in relativistic
  degenerate plasmas   The nonlinear interaction of intense linearly polarized electromagnetic waves
(EMWs) with longitudinal electron density perturbations is revisited in
relativistic degenerate plasmas. The nonlinear dynamics of the EMWs and the
longitudinal field, driven by the EMW ponderomotive force, is governed by a
coupled set of nonlinear partial differential equations. A numerical simulation
of these coupled equations reveals that the generation of wakefields is
possible in weakly relativistic degenerate plasmas with $R_0\equiv p_F/mc\ll1$
and $v_g/c\sim1$, where $p_F$ is the Fermi momentum, $m$ is the mass of
electrons, $c$ is the speed of light in vacuum, and $v_g$ is the EMW group
velocity. However, when the ratio $v_g/c$ is reduced to $\sim0.1$, the
wakefield generation is suppressed, instead the longitudinal fields get
localized to form soliton-like structures. On the other hand, in the regimes of
moderate $(R_0\lesssim1)$ or strong relativistic degeneracy $(R_0>1)$ with
$v_g/c\sim0.1$, only the EM solitons can be formed.

27
The categories of this paper are: comp-gas
16
The categories of this paper are: stat
18
The categories of this paper are: econ
31
The categories of this paper are: ao-sci
8
The categories of this paper are: hep-ex
17
The categories of this paper are: q-fin
14
The categories of this paper are: math-ph
37
The categories of this paper are: supr-con
29
The categories of this paper are: funct-an
13
The categories of this paper are: quant-ph
30
The categories of this paper are: q-alg
21
The categories of this paper are: adap-org
23
The categories of this paper are: solv-int
10
The categories of this paper are: q-bio
33
The categories of this paper are: plasm-ph
25
The categories of this paper are: patt-sol