Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A second order differential equation for a point charged particle   A model for the dynamics of a classical point charged particle interacting
with higher order jet fields is introduced. In this model, the dynamics of the
charged particle is described by an implicit ordinary second order differential
equation. Such equation is free of run-away and pre-accelerated solutions of
Dirac's type. The theory is Lorentz invariant, compatible with the first law of
Newton and Larmor's power radiation formula. Few implications of the new
equation in the phenomenology of non-neutral plasmas is considered.

19
The categories of this paper are: eess
17
The categories of this paper are: q-fin
13
The categories of this paper are: quant-ph
36
The categories of this paper are: cmp-lg
30
The categories of this paper are: q-alg
26
The categories of this paper are: bayes-an
12
The categories of this paper are: nucl-th
22
The categories of this paper are: chao-dyn
37
The categories of this paper are: supr-con
33
The categories of this paper are: plasm-ph
32
The categories of this paper are: atom-ph
4
The categories of this paper are: cond-mat
11
The categories of this paper are: hep-lat
34
The categories of this paper are: chem-ph
1
The categories of this paper are: cs
23
The categories of this paper are: solv-int