Constraints on interacting dynamical dark energy and a new test for $\Lambda$CDM

Abstract

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.

arXiv commentfinal version, published on EPJC

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• Interacting scenarios with dynamical dark energy: observational constraints and alleviation of the $H_0$ tension
• Background evolution and growth of structures in interacting dark energy through dynamical system analysis
• Fierz-Pauli theory reloaded: from a theory of a symmetric tensor field to linearized massive gravity
• Evolution of cosmological perturbations in the models with interacting dynamical dark energy
• Testing Gauss-Bonnet Gravity with DESI BAO Data
• A semi-cosmographic approach to study cosmological evolution in phase space
• Some Classes of Interacting Two-Fluid Model of the Expanding Universe
• New tests of dark sector interactions from the full-shape galaxy power spectrum