Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Robinson-Trautman solution with scalar hair   Explicit Robinson-Trautman solution with minimally coupled free scalar field
is derived and analyzed. It is shown that this solution contains curvature
singularity which is initially naked but later the horizon envelopes it. We use
quasilocal horizon definition and prove its existence in later retarded times
using sub- and supersolution method combined with growth estimates. We show
that the solution is generally of algebraic type II but reduces to type D in
spherical symmetry.

33
The categories of this paper are: plasm-ph
13
The categories of this paper are: quant-ph
21
The categories of this paper are: adap-org
2
The categories of this paper are: math
25
The categories of this paper are: patt-sol
22
The categories of this paper are: chao-dyn
18
The categories of this paper are: econ
37
The categories of this paper are: supr-con
19
The categories of this paper are: eess
0
The categories of this paper are: hep-ph
28
The categories of this paper are: alg-geom
32
The categories of this paper are: atom-ph
6
The categories of this paper are: astro-ph
16
The categories of this paper are: stat
35
The categories of this paper are: mtrl-th
8
The categories of this paper are: hep-ex