Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Spherically symmetric scalar field collapse   It is shown that a scalar field, minimally coupled to gravity may have
collapsing modes even when the energy condition is violated, that is, for
$(\rho+3p)<0$. This result may be useful in the investigation of the possible
clustering of dark energy. All the examples dealt with have apparent horizons
which form before the formation of the singularity. The singularities formed
are shell focusing in nature. The density of the scalar field distribution is
seen to diverge at singularity. The Ricci scalar also diverges at the
singularity. The interior spherically symmetric metric is matched with exterior
Vaidya metric at the hypersurface and the appropriate junction conditions are
obtained.

23
The categories of this paper are: solv-int
31
The categories of this paper are: ao-sci
22
The categories of this paper are: chao-dyn
30
The categories of this paper are: q-alg
28
The categories of this paper are: alg-geom
20
The categories of this paper are: acc-phys
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
36
The categories of this paper are: cmp-lg
17
The categories of this paper are: q-fin
8
The categories of this paper are: hep-ex
3
The categories of this paper are: physics
32
The categories of this paper are: atom-ph
25
The categories of this paper are: patt-sol
29
The categories of this paper are: funct-an