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

Journal Article · Wed Apr 15 00:00:00 EDT 2009 · Journal of Cosmology and Astroparticle Physics

DOI:https://doi.org/10.1088/1475-7516/2009/04/007· OSTI ID:22156957

Vacca, G. La; Bonometto, S. A. ^[1]; Kristiansen, J. R.; Mainini, R. ^[2]; Colombo, L. P.L., ^[3]

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1. Physics Department G. Occhialini, Milano-Bicocca University, Piazza della Scienza 3, 20126 Milano (Italy)
2. Institute of Theoretical Astrophysics, University of Oslo, Box 1029, 0315 Oslo (Norway)
3. Department of Physics and Astronomy, University of Southern California, Los Angeles, CA 90089-0484 (United States)

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.

• OSTI ID: 22156957
• Journal Information: Journal of Cosmology and Astroparticle Physics, Vol. 2009, Issue 04; Other Information: Country of input: International Atomic Energy Agency (IAEA); ISSN 1475-7516
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTROPHYSICS
COSMOLOGY AND ASTRONOMY
COSMOLOGY
COUPLING
DEGREES OF FREEDOM
GALAXIES
MARKOV PROCESS
MASS
MONTE CARLO METHOD
NEUTRINOS
NONLUMINOUS MATTER
SCALAR FIELDS
SPECTRA