Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Creation of multiple de Sitter universes inside a Schwarzschild black
  hole   A classical model for the interior structure of a Schwarzshild black hole
which consists in creating multiple de Sitter universes with lightlike
boundaries is proposed.The interaction of the boundaries is studied and a
scenario leading to disconnected de Sitter universes is described.

10
The categories of this paper are: q-bio
21
The categories of this paper are: adap-org
15
The categories of this paper are: nucl-ex
11
The categories of this paper are: hep-lat
30
The categories of this paper are: q-alg
36
The categories of this paper are: cmp-lg
35
The categories of this paper are: mtrl-th
31
The categories of this paper are: ao-sci
8
The categories of this paper are: hep-ex
25
The categories of this paper are: patt-sol
12
The categories of this paper are: nucl-th
1
The categories of this paper are: cs
34
The categories of this paper are: chem-ph
9
The categories of this paper are: nlin
6
The categories of this paper are: astro-ph
22
The categories of this paper are: chao-dyn