Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Radiation and self-polarization of neutral fermions in quasi-classical
  description   A Lorentz invariant formalism for quasi-classical description of
electromagnetic radiation from a neutral spin 1/2 particle with an anomalous
magnetic moment moving in an external electromagnetic field is developed. In
the high symmetry fields, for which analytical solutions to the
Bargmann--Michel--Telegdi equation are known, the so called self-polarization
axes, i. e. directions of preferred polarization of particles in the radiation
process, are found. Expressions for the radiative transition probability and
spectral-angular distribution of the radiation emitted by a polarized particle
are obtained in the fields under consideration.

11
The categories of this paper are: hep-lat
28
The categories of this paper are: alg-geom
27
The categories of this paper are: comp-gas
35
The categories of this paper are: mtrl-th
20
The categories of this paper are: acc-phys
26
The categories of this paper are: bayes-an
2
The categories of this paper are: math
19
The categories of this paper are: eess
14
The categories of this paper are: math-ph
10
The categories of this paper are: q-bio
34
The categories of this paper are: chem-ph
31
The categories of this paper are: ao-sci
24
The categories of this paper are: dg-ga
8
The categories of this paper are: hep-ex
22
The categories of this paper are: chao-dyn
36
The categories of this paper are: cmp-lg