Superacceleration as the signature of a dark sector interaction

By Subinoy Das, Pier Stefano Corasaniti, J. Khoury. 2005

205 citations recorded by the source corpus.

We show that an interaction between dark matter and dark energy generically results in an effective dark-energy equation of state of w<-1. This arises because the interaction alters the redshift dependence of the matter density. An observer who fits the data treating the dark matter as noninteracting will infer an effective dark-energy fluid with w<-1. We argue that the model is consistent with all current observations, the tightest constraint coming from estimates of the matter density at different redshifts. Comparing the luminosity and angular-diameter distance relations with {lambda}CDM and phantom models, we find that the three models are degenerate within current uncertainties but likely distinguishable by the next generation of dark-energy experiments.

Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics, Statistical and Nonlinear Physics

View Paper: https://www.semanticscholar.org/paper/8d7575795dc07f6f8e8dd97a8b01d6edee68c749

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Citations in the corpus

DESI 2024: reconstructing dark energy using crossing statistics with DESI DR1 BAO data (2024, background): “As discussed in e.g. [ 101, 102], a change of sign in ρ effDE ( z ) could indicate non-trivial interactions in the dark sector.”
Cosmology and Fundamental Physics with the Euclid Satellite (2012, background): “The effective dark energy in these models can also cross the phantom divide without divergences (Huey and Wandelt 2006; Das et al. 2006; Kunz 2009).”