Abstract
We study cosmological models with interaction between dark energy (DE) and dark matter (DM). For the interaction term Q in cosmic evolution equations, there is a model-independent degeneracy-breaking (D-B) point when Q_{1} (a part of Q) equals to zero, where the interaction can be probed without degeneracy between the constant DE equation of state (EoS).
Highlights
Before going forward we need to give a brief introduction of the dark energy (DE)-dark matter (DM) interaction
Though the location of the D-B point depends on the Hubble parameter and its derivatives, its property for breaking degeneracy is cosmological-model-independent
We studied the interaction term Q in cosmological models with interaction between DE and DM
Summary
Before going forward we need to give a brief introduction of the DE-DM interaction. Starting from the standard ΛC D M model, the energy densities of DE and DM evolve as ρDE = ρDE,0 × a−3(1+w) and ρDM = ρDM,0 × a−3 respectively. This is quite reasonable, because the nature of DE and DM is unknown and interaction is permitted in the field theory [17] In this situation, the energy densities of DE and DM are linked to each other and. Instead of the coincidence puzzle or other subjects, we focus on the interaction term Q itself and explore its model-independent properties. After analyzing the structure of Q, a model-independent D-B point is found when Q1 = 0 At this point, the interaction does not depend on the constant DE EoS w. Though the location of the D-B point depends on the Hubble parameter and its derivatives, its property for breaking degeneracy is cosmological-model-independent. 3, the interaction term is introduced into cosmic evolution equations, and the properties of the D-B point is discussed in Sect.
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