Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Perpendicular diffusion of energetic particles in noisy reduced
  magnetohydrodynamic turbulence   Recently a model for noisy reduced magnetohydrodynamic turbulence was
proposed. The latter model was already used to study the random walk of
magnetic field lines. In the current article we use the same model to
investigate the diffusion of energetic particles across the mean magnetic
field. To compute the perpendicular diffusion coefficient two analytical
theories are used, namely the Non- Linear Guiding Center (NLGC) theory and the
Unified Non-Linear Transport (UNLT) theory. It is shown that the two theories
provide different results for the perpendicular diffusion coefficient. We also
perform test-particle simulations for the aforementioned turbulence model. We
show that only the UNLT theory describes perpendicular transport accurately
confirming that the latter theory is a powerful tool in diffusion theory.

27
The categories of this paper are: comp-gas
13
The categories of this paper are: quant-ph
14
The categories of this paper are: math-ph
9
The categories of this paper are: nlin
16
The categories of this paper are: stat
12
The categories of this paper are: nucl-th
22
The categories of this paper are: chao-dyn
35
The categories of this paper are: mtrl-th
2
The categories of this paper are: math
1
The categories of this paper are: cs
0
The categories of this paper are: hep-ph
7
The categories of this paper are: hep-th
21
The categories of this paper are: adap-org
10
The categories of this paper are: q-bio
5
The categories of this paper are: gr-qc
8
The categories of this paper are: hep-ex