Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Charged perfect fluids in the presence of a cosmological constant   We consider the static and spherically symmetric field equations of general
relativity for charged perfect fluid spheres in the presence of a cosmological
constant. Following work by Florides (1983) we find new exact solutions of the
field equations, and discuss their mass radius ratios. These solutions, for
instance, require the charged Nariai metric to be the vacuum part of the
spacetime. We also find charged generalizations of the Einstein static universe
and speculate that the smallness problem of the cosmological constant might
become less problematic if charge is taken into account.

3
The categories of this paper are: physics
15
The categories of this paper are: nucl-ex
26
The categories of this paper are: bayes-an
28
The categories of this paper are: alg-geom
18
The categories of this paper are: econ
8
The categories of this paper are: hep-ex
0
The categories of this paper are: hep-ph
36
The categories of this paper are: cmp-lg
4
The categories of this paper are: cond-mat
37
The categories of this paper are: supr-con
29
The categories of this paper are: funct-an
21
The categories of this paper are: adap-org
2
The categories of this paper are: math
10
The categories of this paper are: q-bio
33
The categories of this paper are: plasm-ph
11
The categories of this paper are: hep-lat