Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Time-reversal violating rotation of polarization plane of light in gas
  placed in the electric field   The rotation of polarization plane of light in a gas placed in the electric
field is considered. Different mechanisms that cause this phenomenon are
investigated. Angle of polarization plane rotation for transition 6S_{1/2} ->
7S_{1/2} in cesium is estimated. The possibility to observe this effect in
experiment is discussed.

8
The categories of this paper are: hep-ex
34
The categories of this paper are: chem-ph
3
The categories of this paper are: physics
32
The categories of this paper are: atom-ph
23
The categories of this paper are: solv-int
36
The categories of this paper are: cmp-lg
7
The categories of this paper are: hep-th
37
The categories of this paper are: supr-con
31
The categories of this paper are: ao-sci
22
The categories of this paper are: chao-dyn
6
The categories of this paper are: astro-ph
14
The categories of this paper are: math-ph
25
The categories of this paper are: patt-sol
13
The categories of this paper are: quant-ph
2
The categories of this paper are: math
19
The categories of this paper are: eess