Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Covariant cosmological perturbation dynamics in the large-scale limit   Using the existence of a covariant conserved quantity on large perturbation
scales in a spatially flat perfect fluid or scalar field universe, we present a
general formula for gauge-invariantly defined comoving energy density
perturbations which encodes the entire linear perturbation dynamics in a closed
time integral. On this basis we discuss perturbation modes in different
cosmological epochs.

10
The categories of this paper are: q-bio
29
The categories of this paper are: funct-an
28
The categories of this paper are: alg-geom
37
The categories of this paper are: supr-con
8
The categories of this paper are: hep-ex
32
The categories of this paper are: atom-ph
4
The categories of this paper are: cond-mat
0
The categories of this paper are: hep-ph
21
The categories of this paper are: adap-org
14
The categories of this paper are: math-ph
20
The categories of this paper are: acc-phys
26
The categories of this paper are: bayes-an
7
The categories of this paper are: hep-th
25
The categories of this paper are: patt-sol
12
The categories of this paper are: nucl-th
9
The categories of this paper are: nlin