Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Skewness as a test of dark energy perturbations   We investigate the role played by dark energy perturbations in the skewness
$S_3$ of large-scale matter distribution. We consider a two-fluid universe
composed by matter and dark energy, with perturbations in both components, and
we estimate numerically the skewness of the matter density field as a function
of the dark energy parameters. We characterize today's $S_3$ value for
quintessence and phantom dark energy cosmologies as well as its dependence on
the matter density parameter $\Omega_{m0}$ and the dark energy sound speed
$c^2_s$ with accurate numerical fitting. These fits can be used to test
cosmology against future high quality data on large scale structure.

17
The categories of this paper are: q-fin
23
The categories of this paper are: solv-int
20
The categories of this paper are: acc-phys
31
The categories of this paper are: ao-sci
25
The categories of this paper are: patt-sol
15
The categories of this paper are: nucl-ex
35
The categories of this paper are: mtrl-th
8
The categories of this paper are: hep-ex
7
The categories of this paper are: hep-th
22
The categories of this paper are: chao-dyn
28
The categories of this paper are: alg-geom
34
The categories of this paper are: chem-ph
3
The categories of this paper are: physics
4
The categories of this paper are: cond-mat
9
The categories of this paper are: nlin
32
The categories of this paper are: atom-ph