Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Gravity Role in Classical Electrodynamics of Charged Point Source   This paper deals with the problem of a point-like charged source under the
influence of the external electromagnetic field in terms of perturbation theory
for GR equations. It is obtained that GR, in contrast with the classical
electrodynamics, in linear perturbation theory predicts an unlimited growth of
the dipole perturbation. It is shown that the reason for this unlimited
perturbation growth might be related to the presence of the unstable rotational
perturbation mode. The analysis of the conditions under which this instability
may disappear is performed. The momentum value at which the stability is
reached is estimated. These estimations give the electron spin by the order of
magnitude (when charge value is equal to elementary one).

29
The categories of this paper are: funct-an
2
The categories of this paper are: math
7
The categories of this paper are: hep-th
4
The categories of this paper are: cond-mat
30
The categories of this paper are: q-alg
25
The categories of this paper are: patt-sol
13
The categories of this paper are: quant-ph
11
The categories of this paper are: hep-lat
34
The categories of this paper are: chem-ph
37
The categories of this paper are: supr-con
6
The categories of this paper are: astro-ph
23
The categories of this paper are: solv-int
19
The categories of this paper are: eess
9
The categories of this paper are: nlin
18
The categories of this paper are: econ
22
The categories of this paper are: chao-dyn