Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Cosmic rays density fluctuations with turbulence universal spectrum -8/3   An exact turbulence universal scaling law-8/3 for the density fluctuations of
cosmic ray (CR) is obtained on the basis of a new analytical compressible
turbulence theory and known two-fluid model of the CR dynamics. It is shown
that the origin of this scaling law may be due to the breaking of the nonlinear
simple waves in CR medium near the scale of their Larmor radii as for the space
plasma of solar wind and magnetosheath.

18
The categories of this paper are: econ
12
The categories of this paper are: nucl-th
17
The categories of this paper are: q-fin
13
The categories of this paper are: quant-ph
33
The categories of this paper are: plasm-ph
29
The categories of this paper are: funct-an
1
The categories of this paper are: cs
28
The categories of this paper are: alg-geom
31
The categories of this paper are: ao-sci
15
The categories of this paper are: nucl-ex
25
The categories of this paper are: patt-sol
35
The categories of this paper are: mtrl-th
10
The categories of this paper are: q-bio
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The categories of this paper are: eess
22
The categories of this paper are: chao-dyn
4
The categories of this paper are: cond-mat