Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Charged particles with spin in a gravitational wave and a uniform
  magnetic field   We study the motion of a pseudo-classical charged particle with spin in the
space-time of a gravitational pp wave in the presence of a uniform magnetic
field.

3
The categories of this paper are: physics
32
The categories of this paper are: atom-ph
36
The categories of this paper are: cmp-lg
29
The categories of this paper are: funct-an
27
The categories of this paper are: comp-gas
0
The categories of this paper are: hep-ph
19
The categories of this paper are: eess
14
The categories of this paper are: math-ph
11
The categories of this paper are: hep-lat
13
The categories of this paper are: quant-ph
23
The categories of this paper are: solv-int
6
The categories of this paper are: astro-ph
35
The categories of this paper are: mtrl-th
24
The categories of this paper are: dg-ga
33
The categories of this paper are: plasm-ph
7
The categories of this paper are: hep-th