Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Constant scalar curvature hypersurfaces in extended Schwarzschild
  space-time   We present a class of spherically symmetric hypersurfaces in the
  Kruskal extension of the Schwarzschild space-time. The hypersurfaces have
constant negative scalar curvature, so they are hyperboloidal in the regions of
space-time which are asymptotically flat.

22
The categories of this paper are: chao-dyn
7
The categories of this paper are: hep-th
19
The categories of this paper are: eess
32
The categories of this paper are: atom-ph
28
The categories of this paper are: alg-geom
29
The categories of this paper are: funct-an
15
The categories of this paper are: nucl-ex
33
The categories of this paper are: plasm-ph
1
The categories of this paper are: cs
10
The categories of this paper are: q-bio
34
The categories of this paper are: chem-ph
24
The categories of this paper are: dg-ga
18
The categories of this paper are: econ
12
The categories of this paper are: nucl-th
11
The categories of this paper are: hep-lat
13
The categories of this paper are: quant-ph