Valentina Salvatelli, Andrea Marchini
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 coupling parameter of \xi=-0.49^{+0.19}_{-0.31} at 68% c.l.. However, in a coupled dark energy framework, the Planck 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 with -0.90< \xi <-0.22 at 95% c.l..
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http://arxiv.org/abs/1304.7119
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