Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Droplet-like Solutions to the Nonlinear Scalar Field Equations in the
  Robertson-Walker Space-time and their Stability   Exact droplet-like solutions to the nonlinear scalar field equations have
been obtained in the Robertson-Walker space-time and their linearized stability
has been proved.

25
The categories of this paper are: patt-sol
7
The categories of this paper are: hep-th
13
The categories of this paper are: quant-ph
9
The categories of this paper are: nlin
34
The categories of this paper are: chem-ph
16
The categories of this paper are: stat
26
The categories of this paper are: bayes-an
33
The categories of this paper are: plasm-ph
27
The categories of this paper are: comp-gas
32
The categories of this paper are: atom-ph
12
The categories of this paper are: nucl-th
37
The categories of this paper are: supr-con
29
The categories of this paper are: funct-an
6
The categories of this paper are: astro-ph
2
The categories of this paper are: math
3
The categories of this paper are: physics