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 an...

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Bibliographic Details
Published in:Journal of cosmology and astroparticle physics 2009-04, Vol.2009 (4), p.007-7
Main Authors: Vacca, G. La, Kristiansen, J.R, Colombo, L.P.L, Mainini, R, Bonometto, S.A
Format: Article
Language:English
Subjects:
ASTROPHYSICS, COSMOLOGY AND ASTRONOMY
COSMOLOGY
COUPLING
DEGREES OF FREEDOM
GALAXIES
MARKOV PROCESS
MASS
MONTE CARLO METHOD
NEUTRINOS
NONLUMINOUS MATTER
SCALAR FIELDS
SPECTRA
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Summary: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 {Lambda}CDM. When the new degrees of freedom are open, we find that CDM-DE coupling and significant neutrino masses ({approx} 0.1 eV 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.
ISSN:1475-7516
1475-7516
DOI:10.1088/1475-7516/2009/04/007