Year: 2006
Type: article
Abstract: Recent data, including the three-year WMAP data, the full 2dF galaxy power spectrum and the first-year data of the Supernova Legacy Survey, are used to constrain model parameters in quintessence cosmologies. In particular, we discuss the inverse power-law (RP) and SUGRA potentials and compare parameter constraints with those for ΛCDM. Both potentials fit current observations with a goodness of fit comparable or better than ΛCDM. The constraints on the energy scale Λ DE appearing in both potential expressions are however different. For RP, only energy scales around the cosmological constant limit are allowed, making the allowed models quite similar to ΛCDM. For SUGRA, Λ DE values approximately up to the electroweak energy scale are still allowed, while other parameter intervals are slightly but significantly displaced. In particular, a value of the primeval spectral index n s = 1 is still allowed at the 95% c.l., and this can have an impact on constraints on possible inflationary potentials.
Authors: L P L Colombo, M Gervasi
Institution: University of Milano-Bicocca
Language: English
Subfield: Astronomy and Astrophysics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W2091684468