Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Black holes and topological surgery   We directly connect topological changes that can occur in mathematical
three-space via surgery, with black hole formation, the formation of wormholes
and new generalizations of these phenomena. This work widens the bridge between
topology and natural sciences and creates a new platform for exploring
geometrical physics.

31
The categories of this paper are: ao-sci
33
The categories of this paper are: plasm-ph
1
The categories of this paper are: cs
34
The categories of this paper are: chem-ph
0
The categories of this paper are: hep-ph
32
The categories of this paper are: atom-ph
11
The categories of this paper are: hep-lat
18
The categories of this paper are: econ
10
The categories of this paper are: q-bio
36
The categories of this paper are: cmp-lg
12
The categories of this paper are: nucl-th
21
The categories of this paper are: adap-org
14
The categories of this paper are: math-ph
6
The categories of this paper are: astro-ph
7
The categories of this paper are: hep-th
26
The categories of this paper are: bayes-an