Determination of the dynamical parameters of the Universe and its age
| dc.creator | Roos, Matts | |
| dc.creator | Harun-or-Rashid, S. M. | |
| dc.date | 1999-01-18 | |
| dc.date | 1999-12-07 | |
| dc.date.accessioned | 2026-07-07T02:30:02Z | |
| dc.date.available | 2026-07-07T02:30:02Z | |
| dc.description | We determine the density parameters $Ω_m$ of gravitating matter and $Ω_Λ$ of vacuum energy, by making a $χ^2$ fit to nine independent astrophysical constraints. Paying rigorous attention to statistical detail, we find that the present best values are $Ω_m=0.31\pm 0.07, Ω_Λ=0.70\pm 0.13$, where these $1σ$ errors are approximately Gaussian (thus trivially convertible to whatever percentage confidence range desired). The total $χ^2$ is 2.5 for 7 degrees of freedom, testifying that the various systematic errors included are generous. Since $Ω_m + Ω_Λ= 1.01\pm 0.15$, it follows that the Einstein-de Sitter model is very strongly ruled out, that also any low-density model with $Ω_Λ=0$ is ruled out, and that a flat cosmology is not only possible, but clearly preferred. In the flat case we find $Ω_m=0.31\pm 0.04$, from which it follows that the age of the Universe is $t_0 = 13.7^{+1.2}_{-1.1}(0.68/h)$ Gyr. | |
| dc.description | 17 Pages, 1 Figure, LaTeX2e | |
| dc.identifier | https://arxiv.org/abs/astro-ph/9901234 | |
| dc.identifier | http://arxiv.org/abs/astro-ph/9901234 | |
| dc.identifier | EPS-HEP'99 proceedings (IoP Publishing 2000) | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/13700 | |
| dc.subject | Astrophysics | |
| dc.title | Determination of the dynamical parameters of the Universe and its age | |
| dc.type | text |