Do WMAP data favor neutrino mass and a coupling between Cold Dark Matter and Dark Energy?

Within the frame of cosmologies where Dark Energy (DE) is a self-interacting scalar field, we allow for a CDM-DE coupling and non-zero neutrino masses, simultaneously. In their 0-0 version, i.e. in the absence of coupling and neutrino mass, these cosmologies provide an excellent fit to WMAP, SNIa and deep galaxy sample spectra, at least as good as ΛCDM. When the new degrees of freedom are open, we find that CDM-DE coupling and significant neutrino masses (∼ 0.1 eV per ν species) are at least as likely as the 0-0 option and, in some cases, even statistically favoured. Results are obtained by using a Monte Carlo Markov Chain approach.

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