Super-acceleration as Signature of Dark Sector Interaction

Details Super-acceleration as Signature of Dark Sector Interaction Super-acceleration as Signature of Dark Sector Interaction

2005-10-20

arxiv.org/abs/astro-ph/0510628v2

Phys.Rev.D73:083509,2006

Astronomy and Astrophysics

Astrophysics

9 pages, 4 figures. v2: Added references

Scientific paper

10.1103/PhysRevD.73.083509

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 non-interacting 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 LambdaCDM 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.

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