Dynamical Dark Energy model parameters with or without massive neutrinos
- Physics Department G. Occhialini, Milano-Bicocca University, Piazza della Scienza 3, 20126 Milano (Italy)
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{sup −9} in RP cosmologies and ∼ 10{sup −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.
- OSTI ID:
- 22273202
- Journal Information:
- Journal of Cosmology and Astroparticle Physics, Vol. 2009, Issue 07; Other Information: Country of input: International Atomic Energy Agency (IAEA); ISSN 1475-7516
- Country of Publication:
- United States
- Language:
- English
Similar Records
Mass varying neutrinos, quintessence, and the accelerating expansion of the Universe
Computation of the halo mass function using physical collapse parameters: application to non-standard cosmologies