Do WMAP5 data favor neutrino mass and a coupling between Cold Dark Matter and Dark Energy?

S. A. Bonometto; G. La Vacca; J. R. Kristiansen; R. Mainini; L. P. L. Colombo

doi:10.1063/1.3462710

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arXiv · 0911.3486

Do WMAP5 data favor neutrino mass and a coupling between Cold Dark Matter and Dark Energy?

S. A. Bonometto·G. La Vacca·J. R. Kristiansen·R. Mainini·L. P. L. Colombo

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Abstract

We fit WMAP5 and related data by allowing for a CDM--DE coupling and non--zero neutrino masses, simultaneously. We find a significant correlation between these parameters, so that simultaneous higher coupling and \nu--masses are allowed. Furthermore, models with a significant coupling and \nu--mass are statistically favoured in respect to a cosmology with no coupling and negligible neutrino mass (our best fits are: C ~ 1/2m_p, m_\nu ~ 0.12eV per flavor). We use a standard Monte Carlo Markov Chain approach, by assuming DE to be a scalar field self--interacting through Ratra--Peebles or SUGRA potentials.

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S. A. Bonometto, G. La Vacca, J. R. Kristiansen, R. Mainini, L. P. L. Colombo. 2009-11-18. Do WMAP5 data favor neutrino mass and a coupling between Cold Dark Matter and Dark Energy?. https://doi.org/10.1063/1.3462710

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