Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Gauge-invariant gravitational perturbations of maximally symmetric
  spacetimes   Gravitational perturbations of anti-deSitter spacetime play important roles
in AdS/CFT correspondence and the brane world scenario. In this paper, we
develop a gauge-invariant formalism of gravitational perturbations of maximally
symmetric spacetimes including anti-deSitter spacetime. Existence of
scalar-type master variables is shown and the corresponding master equations
are derived.

4
The categories of this paper are: cond-mat
29
The categories of this paper are: funct-an
13
The categories of this paper are: quant-ph
12
The categories of this paper are: nucl-th
32
The categories of this paper are: atom-ph
34
The categories of this paper are: chem-ph
1
The categories of this paper are: cs
28
The categories of this paper are: alg-geom
31
The categories of this paper are: ao-sci
11
The categories of this paper are: hep-lat
2
The categories of this paper are: math
8
The categories of this paper are: hep-ex
30
The categories of this paper are: q-alg
33
The categories of this paper are: plasm-ph
36
The categories of this paper are: cmp-lg
9
The categories of this paper are: nlin