Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Landau dispersion relationship in self-consistent field theory   The spectral problem is studied associated with Maxwell-Boltzmann equations
describing collisionless plasma. Formula for instability index is obtained and
effective conditions of two-stream instability are given.

26
The categories of this paper are: bayes-an
30
The categories of this paper are: q-alg
29
The categories of this paper are: funct-an
21
The categories of this paper are: adap-org
17
The categories of this paper are: q-fin
37
The categories of this paper are: supr-con
5
The categories of this paper are: gr-qc
11
The categories of this paper are: hep-lat
13
The categories of this paper are: quant-ph
0
The categories of this paper are: hep-ph
1
The categories of this paper are: cs
22
The categories of this paper are: chao-dyn
18
The categories of this paper are: econ
15
The categories of this paper are: nucl-ex
32
The categories of this paper are: atom-ph
35
The categories of this paper are: mtrl-th