Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Stability of the curvature perturbation in dark sectors' mutual
  interacting models   We consider perturbations in a cosmological model with a small coupling
between dark energy and dark matter. We prove that the stability of the
curvature perturbation depends on the type of coupling between dark sectors.
When the dark energy is of quintessence type, if the coupling is proportional
to the dark matter energy density, it will drive the instability in the
curvature perturbations; however if the coupling is proportional to the energy
density of dark energy, there is room for the stability in the curvature
perturbations. When the dark energy is of phantom type, the perturbations are
always stable, no matter whether the coupling is proportional to the one or the
other energy density.

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The categories of this paper are: adap-org
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The categories of this paper are: dg-ga
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The categories of this paper are: econ
3
The categories of this paper are: physics
36
The categories of this paper are: cmp-lg
33
The categories of this paper are: plasm-ph
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The categories of this paper are: funct-an
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The categories of this paper are: bayes-an
11
The categories of this paper are: hep-lat
30
The categories of this paper are: q-alg
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The categories of this paper are: math-ph
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The categories of this paper are: acc-phys
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The categories of this paper are: chem-ph
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The categories of this paper are: q-fin
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The categories of this paper are: nlin
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The categories of this paper are: stat