Dynamical Dark Energy model parameters with or without massive neutrinos

Abstract

We use WMAP5 and other cosmological data to constrain model parameters in quintessence cosmologies, focusing also on their shift when we allow for non-vanishing neutrino masses. The Ratra-Peebles (RP) and SUGRA potentials are used here, as examples of slowly or fastly varying state parameter w(a). Both potentials depend on an energy scale Λ. Here we confirm the results of previous analysis with WMAP3 data on the upper limits on Λ, which turn out to be rather small (down to ~10^{-9} in RP cosmologies and ~10^{-5} for SUGRA). Our constraints on Λare not heavily affected by the inclusion of neutrino mass as a free parameter. On the contrary, when the neutrino mass degree of freedom is opened, significant shifts in the best-fit values of other parameters occur.

9 pages, 3 figures, submitted to JCAP

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• Growth Rate in the Dynamical Dark Energy Models
• Dark energy from dark radiation in strongly coupled cosmologies with no fine tuning
• High-precision spectra for dynamical Dark Energy cosmologies from constant-w models
• Spectra of dynamical Dark Energy cosmologies from constant-w models
• Perspectives for studying the dark energy at z>2 with galaxy surveys