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

Coupled Dark Energy field variation