Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Cosmological Models in the Nonsymmetric Gravitational Theory   Cosmological consequences of the nonsymmetric gravitational theory (NGT) are
studied. The structure of the NGT field equations is analyzed for an
inhomogeneous and anisotropic universe, based on the spherically symmetric
field equations. It is assumed that the matter density and pressure are purely
time dependent, and it is shown that the field equations allow open, flat and
closed universes. The field equations are expanded about the
Friedmann-Robertson-Walker (FRW) model for a small antisymmetric field. The
observations are most in accord with the approximately spatially flat universe,
which has an FRW metric to lowest order in the skew field. The recent analysis
of galaxy synchroton radiation polarization data, which indicates a residual
polarization after Faraday polarization is subtracted, can be explained by the
birefringence of electromagnetic waves produced by the NGT spacetime.

2
The categories of this paper are: math
22
The categories of this paper are: chao-dyn
11
The categories of this paper are: hep-lat
35
The categories of this paper are: mtrl-th
31
The categories of this paper are: ao-sci
32
The categories of this paper are: atom-ph
37
The categories of this paper are: supr-con
13
The categories of this paper are: quant-ph
12
The categories of this paper are: nucl-th
33
The categories of this paper are: plasm-ph
18
The categories of this paper are: econ
10
The categories of this paper are: q-bio
7
The categories of this paper are: hep-th
1
The categories of this paper are: cs
15
The categories of this paper are: nucl-ex
27
The categories of this paper are: comp-gas