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Constraints on interacting dark energy models through cosmic chronometers and Gaussian process
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In this paper, after reconstructing the redshift evolution of the Hubble function by adopting Gaussian process techniques, we estimate the best-fit parameters for some flat Friedmann cosmological models based on a Modified Chaplygin Gas interacting with dark matter. In fact, the expansion history of the Universe will be investigated because passively evolving galaxies constitute cosmic chronometers. An estimate for the present-day values of the deceleration parameter, adiabatic speed of sound within the dark energy fluid, effective dark energy, and dark matter equation of state parameters is provided. By this, we mean that the interaction term between the two dark fluids, which breaks the Bianchi symmetries, will be interpreted as an effective contribution to the dark matter pressure similarly to the framework of the "Generalized Dark Matter". We investigate whether the estimates of the Hubble constant and of the present-day abundance of dark matter are sensitive to the dark matter - dark energy coupling. We will also show that the cosmic chronometers data favor a cold dark matter and that our findings are in agreement with the Le Ch\^atelier-Braun principle according to which dark energy should decay into dark matter.
Forward citations
Cited by 5 Pith papers
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Hubble tension: the shape wall
Late-time modifications to the expansion history can raise H0 by at most about 2% (conservative) to 3.7% (permissive) if the CMB acoustic scale is fixed.
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Cosmo-Learn: code for learning cosmology using different methods and mock data
An open-source toolkit that simulates late-universe cosmological observations and benchmarks MCMC, genetic algorithms, Gaussian processes, Bayesian ridge regression, and neural networks in one pipeline.
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Interacting dark energy in the early 2020s: a promising solution to the $H_0$ and cosmic shear tensions
An interacting dark energy model with coupling proportional to the dark energy density alleviates the H0 and S8 tensions in Planck 2018 data but is not preferred once BAO and supernova data are included.
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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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Measuring the expansion history of the Universe with cosmic chronometers
A review of the cosmic chronometer method: differential ages of massive passive galaxies yield cosmology-independent H(z) measurements, now at about 5% accuracy at z~0.5 and potentially percent-level H0 with future surveys.
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