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Future weak lensing constraints in a dark coupled universe

By Francesco De Bernardis, Matteo Martinelli, Alessandro Melchiorri, Olga Mena and Asantha Cooray

Abstract

Coupled cosmologies can predict values for the cosmological parameters at low redshifts which may differ substantially from the parameters values within non-interacting cosmologies. Therefore, low redshift probes, as the growth of structure and the dark matter distribution via galaxy and weak lensing surveys constitute a unique tool to constrain interacting dark sector models. We focus here on weak lensing forecasts from future Euclid and LSST-like surveys combined with the ongoing Planck cosmic microwave background experiment. We find that these future data could constrain the dimensionless coupling to be smaller than a few $\times 10^{-2}$. The coupling parameter $\xi$ is strongly degenerate with the cold dark matter energy density $\Omega_{c}h^2$ and the Hubble constant $H_0$.These degeneracies may cause important biases in the cosmological parameter values if in the universe there exists an interaction among the dark matter and dark energy sectors.Comment: 8 pages, 6 figure

Topics: Astrophysics - Cosmology and Nongalactic Astrophysics, High Energy Physics - Phenomenology
Year: 2011
DOI identifier: 10.1103/PhysRevD.84.023504
OAI identifier: oai:arXiv.org:1104.0652
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