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

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

2009-02-16

arxiv.org/abs/0902.2711v1

JCAP 0904:007,2009

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

18 pages, 10 figures, submitted to JCAP

Scientific paper

10.1088/1475-7516/2009/04/007

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 \LambdaCDM. When the new degrees of freedom are open, we find that CDM--DE coupling and significant neutrino masses (~0.1eV per \nu 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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