Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Cylindrically symmetric models of gravitational collapse to black holes:
  a short review   We survey results about exact cylindrically symmetric models of gravitational
collapse in General Relativity. We focus on models which result from the
matching of two spacetimes having collapsing interiors which develop trapped
surfaces and vaccum exteriors containing gravitational waves. We collect some
theorems from the literature which help to decide a priori about eventual
spacetime matchings. We revise, in more detail, some toy models which include
some of the main mathematical and physical issues that arise in this context,
and compute the gravitational energy flux through the matching boundary of a
particular collapsing region. Along the way, we point out several interesting
open problems.

16
The categories of this paper are: stat
34
The categories of this paper are: chem-ph
25
The categories of this paper are: patt-sol
22
The categories of this paper are: chao-dyn
4
The categories of this paper are: cond-mat
37
The categories of this paper are: supr-con
29
The categories of this paper are: funct-an
13
The categories of this paper are: quant-ph
21
The categories of this paper are: adap-org
1
The categories of this paper are: cs
28
The categories of this paper are: alg-geom
10
The categories of this paper are: q-bio
8
The categories of this paper are: hep-ex
23
The categories of this paper are: solv-int
11
The categories of this paper are: hep-lat
6
The categories of this paper are: astro-ph