Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Towards conformal cosmology   Approximate de Sitter symmetry of inflating Universe is responsible for the
approximate flatness of the power spectrum of scalar perturbations. However,
this is not the only option. Another symmetry which can explain nearly
scale-invariant power spectrum is conformal invariance. We give a short review
of models based on conformal symmetry which lead to the scale-invariant
spectrum of the scalar perturbations. We discuss also potentially observable
features of these models.

18
The categories of this paper are: econ
10
The categories of this paper are: q-bio
33
The categories of this paper are: plasm-ph
13
The categories of this paper are: quant-ph
9
The categories of this paper are: nlin
20
The categories of this paper are: acc-phys
28
The categories of this paper are: alg-geom
12
The categories of this paper are: nucl-th
16
The categories of this paper are: stat
29
The categories of this paper are: funct-an
25
The categories of this paper are: patt-sol
27
The categories of this paper are: comp-gas
24
The categories of this paper are: dg-ga
35
The categories of this paper are: mtrl-th
17
The categories of this paper are: q-fin
4
The categories of this paper are: cond-mat