Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Radiative spacetimes   The question of existence of general, asymptotically flat radiative
spacetimes and examples of explicit classes of radiative solutions of
Einstein's field equations are discussed in the light of some new developments.
The examples are cylindrical waves, Robinson-Trautman and type N spacetimes and
especially boost-rotation symmetric spacetimes representing uniformly
accelerated particles or black holes.

15
The categories of this paper are: nucl-ex
34
The categories of this paper are: chem-ph
25
The categories of this paper are: patt-sol
17
The categories of this paper are: q-fin
20
The categories of this paper are: acc-phys
12
The categories of this paper are: nucl-th
2
The categories of this paper are: math
21
The categories of this paper are: adap-org
35
The categories of this paper are: mtrl-th
32
The categories of this paper are: atom-ph
28
The categories of this paper are: alg-geom
26
The categories of this paper are: bayes-an
36
The categories of this paper are: cmp-lg
31
The categories of this paper are: ao-sci
4
The categories of this paper are: cond-mat
6
The categories of this paper are: astro-ph