Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The problem of ultracompact rotating gravastars   A number of authors provided arguments that a rotating gravastar is a good
candidate for a source of the Kerr metric. These arguments were based on the
second order perturbation analysis. In the following paper, we construct a
perturbative solution of the rotating gravastar up to the third perturbation
order and show that it cannot be continuously matched with the Kerr spacetime.

35
The categories of this paper are: mtrl-th
15
The categories of this paper are: nucl-ex
27
The categories of this paper are: comp-gas
28
The categories of this paper are: alg-geom
34
The categories of this paper are: chem-ph
26
The categories of this paper are: bayes-an
17
The categories of this paper are: q-fin
25
The categories of this paper are: patt-sol
13
The categories of this paper are: quant-ph
30
The categories of this paper are: q-alg
19
The categories of this paper are: eess
1
The categories of this paper are: cs
33
The categories of this paper are: plasm-ph
6
The categories of this paper are: astro-ph
8
The categories of this paper are: hep-ex
14
The categories of this paper are: math-ph