Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: 4D static solutions with interacting phantom fields   Three static models with two interacting phantom and ghost scalar fields were
considered: a model of a traversable wormhole, a brane-like model and a
spherically symmetric problem. It was shown numerically that regular solutions
exist for all three cases.

2
The categories of this paper are: math
31
The categories of this paper are: ao-sci
23
The categories of this paper are: solv-int
1
The categories of this paper are: cs
25
The categories of this paper are: patt-sol
36
The categories of this paper are: cmp-lg
18
The categories of this paper are: econ
6
The categories of this paper are: astro-ph
29
The categories of this paper are: funct-an
24
The categories of this paper are: dg-ga
12
The categories of this paper are: nucl-th
19
The categories of this paper are: eess
15
The categories of this paper are: nucl-ex
21
The categories of this paper are: adap-org
30
The categories of this paper are: q-alg
27
The categories of this paper are: comp-gas