Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Gravitational Collapse of Massless Vector Field with Positive
  Cosmological Constant   We investigate the dynamics of homogeneous gravitational collapse of a
massless vector field in the presence of a positive cosmological constant
$\Lambda$. The corresponding density function $\rho (a)$ obtained for the
massless vector field is inversely proportional to the fourth power of the
scale factor $a (t)$. The variation of the scale factor shows that for $0\,
\le\Lambda < 1$, we obtain the gravitational collapse of the vector fields
leading singularity formation in a {\it finite} comoving time resulting in a
{\it Blackhole} such that with increasing $\Lambda$, the singularity formation
time, $t_s$ increases. For $\Lambda = 1$, we obtain $a(t) = 0$, thus limiting
the maximum value of $\Lambda$, (w.r.t the initial density $\rho_0$) for which
the system could collapse under gravity.

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The categories of this paper are: alg-geom
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The categories of this paper are: nucl-th
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The categories of this paper are: comp-gas
2
The categories of this paper are: math
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The categories of this paper are: cmp-lg
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The categories of this paper are: dg-ga
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The categories of this paper are: adap-org
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The categories of this paper are: nucl-ex
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The categories of this paper are: stat
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The categories of this paper are: math-ph
0
The categories of this paper are: hep-ph
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The categories of this paper are: q-fin
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The categories of this paper are: atom-ph
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The categories of this paper are: eess
8
The categories of this paper are: hep-ex
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The categories of this paper are: plasm-ph