We use WMAP5 and other cosmological data to constrain model parameters in quintessence cosmologies, focusing also on their shift when we allow for non-vanishing neutrino masses. The Ratra-Peebles (RP) and SUGRA potentials are used here, as examples of slowly or fastly varying state parameter w(a). Both potentials depend on an energy scale Λ. Here we confirm the results of previous analysis with WMAP3 data on the upper limits on Λ, which turn out to be rather small (down to ∼ 10 -9 in RP cosmologies and ∼ 10 -5 for SUGRA). Our constraints on Λ are not heavily affected by the inclusion of neutrino mass as a free parameter. On the contrary, when the neutrino mass degree of freedom is opened, significant shifts in the best-fit values of other parameters occur. © 2009 IOP Publishing Ltd.

LA VACCA, G., Kristiansen, J. (2009). Dynamical dark energy model parameters with or without massive neutrinos. JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS, 2009(7), 036-036 [10.1088/1475-7516/2009/07/036].

Dynamical dark energy model parameters with or without massive neutrinos

LA VACCA, GIUSEPPE;
2009

Abstract

We use WMAP5 and other cosmological data to constrain model parameters in quintessence cosmologies, focusing also on their shift when we allow for non-vanishing neutrino masses. The Ratra-Peebles (RP) and SUGRA potentials are used here, as examples of slowly or fastly varying state parameter w(a). Both potentials depend on an energy scale Λ. Here we confirm the results of previous analysis with WMAP3 data on the upper limits on Λ, which turn out to be rather small (down to ∼ 10 -9 in RP cosmologies and ∼ 10 -5 for SUGRA). Our constraints on Λ are not heavily affected by the inclusion of neutrino mass as a free parameter. On the contrary, when the neutrino mass degree of freedom is opened, significant shifts in the best-fit values of other parameters occur. © 2009 IOP Publishing Ltd.
Articolo in rivista - Articolo scientifico
Cosmological parameters from CMBR; Dark energy theory; Dark matter theory; Neutrino masses from cosmology; Astronomy and Astrophysics
English
036
036
1
LA VACCA, G., Kristiansen, J. (2009). Dynamical dark energy model parameters with or without massive neutrinos. JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS, 2009(7), 036-036 [10.1088/1475-7516/2009/07/036].
LA VACCA, G; Kristiansen, J
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/73416
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