Coupled Dark Energy field variation

TL;DR

This paper investigates how the dark energy field varies under different interaction models with cold dark matter, deriving bounds on model parameters based on the Planck mass constraint.

Contribution

It introduces bounds on coupling and adiabatic coefficients for dark energy models considering interactions with dark matter, using three parameterizations.

Findings

Bounds on coupling and adiabatic coefficients derived

Variation of dark energy field constrained by Planck mass

Analysis of energy flow directions between dark energy and dark matter

Abstract

The variation of the dark energy field is found under the assumption that the dark energy is parametric and interacts with the cold dark matter. Considering that the variation of the field could not exceed the Planck mass, we obtain bounds on the coupling and adiabatic coefficients. Three parameterizations of the adiabatic coefficients are considered and two coupling terms where the energy flows from dark energy to dark matter, or the other way around.