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Dynamics and statefinder analysis of a class of sign-changeable interacting dark energy scenarios
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abstract
We revise the dynamical properties of a class of cosmological models where the dark sector interacts through an interacting term that changes sign during evolution. In particular, we obtain the critical points and we investigate the existence and stability conditions for cosmological solutions, describing radiation, matter and dark energy dominated eras. We find that all the studied models admit a stable critical point corresponding to an accelerated phase. We use background data to find the best fit parameters for one of the studied models, resulting an interacting parameter with a definite sign within $1\sigma$ confidence level, consistent with the results of the dynamical system analysis. We also compute the statefinder parameters and plot the $r-q$ and $r-s$ planes, where we observe different trajectories when we vary the interaction parameter for a specific model and when we vary the interacting scenario. We can in this sense distinguish among models, including $\Lambda$CDM.
Forward citations
Cited by 3 Pith papers
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Interacting phantom dark energy: new accelerating scaling attractors
Interacting phantom dark energy with two previously underused potentials admits new stable late-time accelerating solutions in which dark matter and dark energy coexist.
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On the Gaussian Assumption in the Estimation of Parameters for Dark Energy Models
Pantheon+ supernova distance moduli and model residuals are found to be non-Gaussian, better fit by a skew-t distribution, and bootstrap confidence intervals are provided for an interacting dark-energy model.
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In search of an interaction in the dark sector through Gaussian Process and ANN approaches
Reconstructed dark-sector interaction from CC and Pantheon+ data is consistent with zero for w_DE = -1 but becomes nonzero whenever w_DE is fixed away from -1, in both Gaussian Process and ANN analyses.
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