Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Is it possible to consider Dark Energy and Dark Matter as a same and
  unique Dark Fluid?   In the standard model of cosmology, the present evolution of the Universe is
determined by the presence of two components of unknown nature. One of them is
referenced as ``dark matter'' to justify the fact that it behaves
cosmologically like usual baryonic matter, whereas the other one is called
``dark energy'', which is a component with a negative pressure. As the nature
of both dark components remains unknown, it is interesting to consider other
models. In particular, it seems that the cosmological observations can also be
understood for a Universe which does not contain two fluids of unknown nature,
but only one fluid with other properties. To arrive to this conclusion, we will
review the observational constraints from supernovae of type Ia, cosmic
microwave background, large scale structures, and the theoretical results of
big-bang nucleosynthesis. We will try to determine constraints on this unifying
``dark fluid'', and briefly review different possibilities to build models of
dark fluid.

27
The categories of this paper are: comp-gas
31
The categories of this paper are: ao-sci
1
The categories of this paper are: cs
25
The categories of this paper are: patt-sol
8
The categories of this paper are: hep-ex
34
The categories of this paper are: chem-ph
15
The categories of this paper are: nucl-ex
14
The categories of this paper are: math-ph
0
The categories of this paper are: hep-ph
16
The categories of this paper are: stat
33
The categories of this paper are: plasm-ph
24
The categories of this paper are: dg-ga
29
The categories of this paper are: funct-an
5
The categories of this paper are: gr-qc
17
The categories of this paper are: q-fin
20
The categories of this paper are: acc-phys