Investigate the interaction between dark matter and dark energy

TL;DR

This paper explores how dark matter and dark energy might interact by analyzing observational data with models featuring constant and variable interaction functions, revealing weak or negligible interactions and their effects on cosmic evolution.

Contribution

It introduces and constrains two different interacting models between dark matter and dark energy using current observational data, highlighting the nature of their interaction.

Findings

Interaction strength is non-zero but weak for constant interaction

Interaction is not significant for variable interaction

Interaction influences the evolution of dark energy and dark matter densities

Abstract

In this paper we investigate the interaction between dark matter and dark energy by considering two different interacting scenarios, i.e. the cases of constant interaction function and variable interaction function. By fitting the current observational data to constrain the interacting models, it is found that the interacting strength is non-vanishing, but weak for the case of constant interaction function, and the interaction is not obvious for the case of variable interaction function. In addition, for seeing the influence from interaction we also investigate the evolutions of interaction function, effective state parameter for dark energy and energy density of dark matter. At last some geometrical quantities in the interacting scenarios are discussed.