In dark matter-dark energy coupling models, the Kaiser formula gains a coupling-dependent term, so redshift-space distortions measure an effective growth rate that differs from the true matter growth rate, with Euclid and SKA2 forecasts.
Dark energy and the Boomerang data
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abstract
The recent high-quality Boomerang data allow to test many competing cosmological models. Here I present a seven-parameter likelihood analysis of dark energy models with exponential potential and explicit coupling to dark matter. Such a model is conformally equivalent to a scalar field with non-minimal coupling to gravity. So far, the constraints on a dark energy - dark matter coupling were extremely weak. The Boomerang data constrain the dimensionless coupling $\beta $ to be smaller than 0.1, an order of magnitude better than previous limits. In terms of the constant $\xi $ of non-minimally coupled theories, this amounts to $\xi <0.01.$ On the other hand, Boomerang has not enough sensitivity to put constraints on the potential slope.
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astro-ph.CO 1years
2019 1verdicts
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Redshift space distortions in the presence of non-minimally coupled dark matter
In dark matter-dark energy coupling models, the Kaiser formula gains a coupling-dependent term, so redshift-space distortions measure an effective growth rate that differs from the true matter growth rate, with Euclid and SKA2 forecasts.