Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The algebraic structure of a cosmological term in spherically symmetric
  solutions   We propose to describe the dynamics of a cosmological term in the spherically
symmetric case by an r-dependent second rank symmetric tensor invariant under
boosts in the radial direction. This proposal is based on the Petrov
classification scheme and Einstein field equations in the spherically symmetric
case. The inflationary equation of state p=-\rho is satisfied by the radial
pressure. The tangential pressure is calculated from the conservation equation
(the contracted Bianchi identity).

3
The categories of this paper are: physics
9
The categories of this paper are: nlin
12
The categories of this paper are: nucl-th
33
The categories of this paper are: plasm-ph
17
The categories of this paper are: q-fin
28
The categories of this paper are: alg-geom
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The categories of this paper are: hep-ex
11
The categories of this paper are: hep-lat
15
The categories of this paper are: nucl-ex
24
The categories of this paper are: dg-ga
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The categories of this paper are: astro-ph
26
The categories of this paper are: bayes-an
25
The categories of this paper are: patt-sol
10
The categories of this paper are: q-bio
13
The categories of this paper are: quant-ph
4
The categories of this paper are: cond-mat