Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Trapped surfaces and horizons in static massless scalar field spacetimes   We consider here the existence and structure of trapped surfaces, horizons
and singularities in spherically symmetric static massless scalar field
spacetimes. Earlier studies have shown that there exists no event horizon in
such spacetimes if the scalar field is asymptotically flat. We extend this
result here to show that this is true in general for spherically symmetric
static massless scalar field spacetimes, whether the scalar field is
asymptotically flat or not. Other general properties and certain important
features of these models are also discussed.

22
The categories of this paper are: chao-dyn
14
The categories of this paper are: math-ph
30
The categories of this paper are: q-alg
17
The categories of this paper are: q-fin
1
The categories of this paper are: cs
11
The categories of this paper are: hep-lat
27
The categories of this paper are: comp-gas
7
The categories of this paper are: hep-th
9
The categories of this paper are: nlin
32
The categories of this paper are: atom-ph
10
The categories of this paper are: q-bio
2
The categories of this paper are: math
34
The categories of this paper are: chem-ph
25
The categories of this paper are: patt-sol
37
The categories of this paper are: supr-con
31
The categories of this paper are: ao-sci