Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Can the cosmological dark sector be modeled by a single scalar field?   In a previous paper it was shown that a minimally coupled scalar field of
mass $M \sim H_0$ can describe both components of the dark sector in a unified
way. In the solution found, the dark energy component decays linearly with the
Hubble parameter, with a homogeneous creation of dark matter. In the present
note we show that a $\Lambda$CDM dark sector can also be modeled by such a
single field. More generally, we show that the system of Klein-Gordon and
Einstein equations admits a uniparametric family of solutions that is
equivalent to a non-adiabatic (with zero sound speed) generalised Chaplygin
gas.

25
The categories of this paper are: patt-sol
18
The categories of this paper are: econ
14
The categories of this paper are: math-ph
31
The categories of this paper are: ao-sci
34
The categories of this paper are: chem-ph
28
The categories of this paper are: alg-geom
0
The categories of this paper are: hep-ph
35
The categories of this paper are: mtrl-th
1
The categories of this paper are: cs
12
The categories of this paper are: nucl-th
30
The categories of this paper are: q-alg
9
The categories of this paper are: nlin
26
The categories of this paper are: bayes-an
33
The categories of this paper are: plasm-ph
3
The categories of this paper are: physics
2
The categories of this paper are: math