Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Constraints on interacting dynamical dark energy and a new test for
  $\Lambda$CDM   We consider a generic description of interacting dynamical Dark Energy,
characterized by an equation of state with a time dependent coefficient $w(t)$,
and which may interact with both radiation and matter. Without referring to any
particular cosmological model, we find a differential equation which must be
satisfied by $w(t)$ and involving the function $Q(t)$ which describes the
interaction between Dark Energy and the other cosmological fluids. The relation
we find represents a constraint for various models of interacting dynamical
Dark Energy. In addition, an observable is proposed, depending on kinematic
variables and on density parameters, which may serve as a new test for
$\Lambda$CDM.

25
The categories of this paper are: patt-sol
0
The categories of this paper are: hep-ph
23
The categories of this paper are: solv-int
19
The categories of this paper are: eess
22
The categories of this paper are: chao-dyn
35
The categories of this paper are: mtrl-th
16
The categories of this paper are: stat
2
The categories of this paper are: math
17
The categories of this paper are: q-fin
11
The categories of this paper are: hep-lat
21
The categories of this paper are: adap-org
30
The categories of this paper are: q-alg
28
The categories of this paper are: alg-geom
36
The categories of this paper are: cmp-lg
9
The categories of this paper are: nlin
29
The categories of this paper are: funct-an