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2013

New constraints on Coupled Dark Energy from Planck

Salvatelli, Valentina, Marchini, Andrea, Lopez-Honorez, Laura et al.

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We present new constraints on coupled dark energy from the recent measurements of the Cosmic Microwave Background Anisotropies from the Planck satellite mission.

We found that a coupled dark energy model is fully compatible with the Planck measurements, deriving a weak bound on the dark matter-dark energy coupling parameter \xi=-0.49^{+0.19}_{-0.31} at 68% c.l..
Moreover if Planck data are fitted to a coupled dark energy scenario, the constraint on the Hubble constant is relaxed to H_0=72.1^{+3.2}_{-2.3} km/s/Mpc, solving the tension with the Hubble Space Telescope value.
We show that a combined Planck+HST analysis provides significant evidence for coupled dark energy finding a non-zero value for the coupling parameter \xi, with -0.90< \xi <-0.22 at 95% c.l..

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