https://doi.org/10.1140/epjc/s10052-019-7198-1
Regular Article - Theoretical Physics
Constraints on interacting dynamical dark energy and a new test for 
CDM
1
Dipartimento di Fisica, Università di Genova, via Dodecaneso 33, 16146, Genova, Italy
2
I.N.F.N.-Sezione di Genova, via Dodecaneso 33, 16146, Genova, Italy
* e-mail: nicola.maggiore@ge.infn.it
Received:
25
March
2019
Accepted:
4
August
2019
Published online:
12
August
2019
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 CDM.
© The Author(s), 2019
