Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The curious case of the Buchdahl-Land-Sultana-Wyman-Iba\~nez-Sanz
  spacetime   We revisit Wyman's "other" scalar field solution of the Einstein equations
and its Sultana generalization to positive cosmological constant, which has a
finite 3-space and corresponds to a special case of a stiff fluid solution
proposed by Buchdahl and Land and, later, by Iba\~nez and Sanz to model
relativistic stars. However, there is a hidden cosmological constant and the
peculiar geometry prevents the use of this spacetime to model relativistic
stars.

27
The categories of this paper are: comp-gas
25
The categories of this paper are: patt-sol
0
The categories of this paper are: hep-ph
30
The categories of this paper are: q-alg
19
The categories of this paper are: eess
13
The categories of this paper are: quant-ph
33
The categories of this paper are: plasm-ph
24
The categories of this paper are: dg-ga
34
The categories of this paper are: chem-ph
31
The categories of this paper are: ao-sci
1
The categories of this paper are: cs
15
The categories of this paper are: nucl-ex
32
The categories of this paper are: atom-ph
14
The categories of this paper are: math-ph
26
The categories of this paper are: bayes-an
37
The categories of this paper are: supr-con