Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Instability of scalar charges in 1+1D and 2+1D   We study the phenomenon of mass loss by a scalar charge -- a point particle
which acts as a source for a (non-interacting) scalar field -- in
(1+1)-dimensional and (2+1)-dimensional flat spacetime. We find that such
particles are unstable against self interaction: they lose their mass through
the emission of monopole radiation. This is in sharp contrast with scalar
charges in (3+1)-dimensional flat spacetime, where no such phenomenon occurs.

23
The categories of this paper are: solv-int
34
The categories of this paper are: chem-ph
28
The categories of this paper are: alg-geom
11
The categories of this paper are: hep-lat
3
The categories of this paper are: physics
8
The categories of this paper are: hep-ex
27
The categories of this paper are: comp-gas
12
The categories of this paper are: nucl-th
1
The categories of this paper are: cs
14
The categories of this paper are: math-ph
18
The categories of this paper are: econ
9
The categories of this paper are: nlin
6
The categories of this paper are: astro-ph
15
The categories of this paper are: nucl-ex
26
The categories of this paper are: bayes-an
21
The categories of this paper are: adap-org