Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Roles of dark energy perturbations in the dynamical dark energy models:
  Can we ignore them?   We show the importance of properly including the perturbations of the dark
energy component in the dynamical dark energy models based on a scalar field
and modified gravity theories in order to meet with present and future
observational precisions. Based on a simple scaling scalar field dark energy
model, we show that observationally distinguishable substantial differences
appear by ignoring the dark energy perturbation. By ignoring it the perturbed
system of equations becomes inconsistent and deviations in (gauge-invariant)
power spectra depend on the gauge choice.

13
The categories of this paper are: quant-ph
12
The categories of this paper are: nucl-th
20
The categories of this paper are: acc-phys
27
The categories of this paper are: comp-gas
24
The categories of this paper are: dg-ga
26
The categories of this paper are: bayes-an
33
The categories of this paper are: plasm-ph
2
The categories of this paper are: math
28
The categories of this paper are: alg-geom
35
The categories of this paper are: mtrl-th
18
The categories of this paper are: econ
11
The categories of this paper are: hep-lat
36
The categories of this paper are: cmp-lg
3
The categories of this paper are: physics
23
The categories of this paper are: solv-int
8
The categories of this paper are: hep-ex