Evidence for interacting dark energy from BOSS
Elisa G. M. Ferreira, Jerome Quintin, Andr\'e A. Costa, E. Abdalla,, Bin Wang

TL;DR
This paper presents evidence that interacting dark energy models better explain high-redshift baryon acoustic oscillation data than the standard Lambda-CDM model, suggesting possible deviations in dark energy behavior at early times.
Contribution
It introduces a phenomenological interacting dark energy model that fits high-redshift BAO data and improves concordance with observations over Lambda-CDM.
Findings
Interacting models fit BAO data better than Lambda-CDM.
Small positive coupling constants are compatible with observations.
Dark energy equation of state slightly favors deviation from a cosmological constant.
Abstract
The result presented by the BOSS-SDSS Collaboration measuring the baryon acoustic oscillations of the Lyman- forest from high-redshift quasars indicates a departure from the standard -cold-dark-matter model. This is the first time that the evolution of dark energy at high redshifts has been measured, and the current results cannot be explained by simple generalizations of the cosmological constant. We show here that a simple phenomenological interaction in the dark sector provides a good explanation for this deviation, naturally accommodating the Hubble parameter obtained by BOSS, . By performing a global fit of the parameters with the inclusion of this new data set together with the Planck data for the interacting model, we are able to show that some interacting models have constraints for and…
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