Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Generalized dark energy interactions with multiple fluids   In the search for an explanation for the current acceleration of the
Universe, scalar fields are the most simple and useful tools to build models of
dark energy. This field, however, must in principle couple with the rest of the
world and not necessarily in the same way to different particles or fluids. We
provide the most complete dynamical system analysis to date, consisting of a
canonical scalar field conformally and disformally coupled to both dust and
radiation. We perform a detailed study of the existence and stability
conditions of the systems and comment on constraints imposed on the disformal
coupling from Big-Bang Nucleosynthesis and given current limits on the
variation of the fine-structure constant.

29
The categories of this paper are: funct-an
4
The categories of this paper are: cond-mat
34
The categories of this paper are: chem-ph
37
The categories of this paper are: supr-con
0
The categories of this paper are: hep-ph
23
The categories of this paper are: solv-int
20
The categories of this paper are: acc-phys
16
The categories of this paper are: stat
13
The categories of this paper are: quant-ph
12
The categories of this paper are: nucl-th
21
The categories of this paper are: adap-org
27
The categories of this paper are: comp-gas
30
The categories of this paper are: q-alg
1
The categories of this paper are: cs
14
The categories of this paper are: math-ph
36
The categories of this paper are: cmp-lg