Theoretical and observational bounds on some interacting vacuum energy scenarios

Abstract

The dynamics of interacting dark matter-dark energy models is characterized through an interaction rate function quantifying the energy flow between these dark sectors. In most of the interaction functions, the expansion rate Hubble function is considered and sometimes it is argued that, as the interaction function is a local property, the inclusion of the Hubble function may influence the overall dynamics. This is the starting point of the present article where we consider a very simple interacting cosmic scenario between vacuum energy and the cold dark matter characterized by various interaction functions originated from a general interaction function. ; J.dH. has been supported by MINECO (Spain) Grant No. MTM2017-84214-C2-1-P, and in part by the Catalan Government 2017-SGR-247 ; Peer Reviewed ; Postprint (published version)