Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Determination of the dynamical parameters of the Universe and its age   We determine the density parameters $\Omega_m$ of gravitating matter and
$\Omega_{\Lambda}$ of vacuum energy, by making a $\chi^2$ fit to nine
independent astrophysical constraints. Paying rigorous attention to statistical
detail, we find that the present best values are $\Omega_m=0.31\pm 0.07,
\Omega_{\Lambda}=0.70\pm 0.13$, where these $1\sigma$ errors are approximately
Gaussian (thus trivially convertible to whatever percentage confidence range
desired). The total $\chi^2$ is 2.5 for 7 degrees of freedom, testifying that
the various systematic errors included are generous. Since $\Omega_m +
\Omega_{\Lambda}= 1.01\pm 0.15$, it follows that the Einstein-de Sitter model
is very strongly ruled out, that also any low-density model with
$\Omega_{\Lambda}=0$ is ruled out, and that a flat cosmology is not only
possible, but clearly preferred. In the flat case we find $\Omega_m=0.31\pm
0.04$, from which it follows that the age of the Universe is $t_0 =
13.7^{+1.2}_{-1.1}(0.68/h)$ Gyr.

19
The categories of this paper are: eess
25
The categories of this paper are: patt-sol
9
The categories of this paper are: nlin
13
The categories of this paper are: quant-ph
17
The categories of this paper are: q-fin
8
The categories of this paper are: hep-ex
27
The categories of this paper are: comp-gas
5
The categories of this paper are: gr-qc
26
The categories of this paper are: bayes-an
10
The categories of this paper are: q-bio
32
The categories of this paper are: atom-ph
24
The categories of this paper are: dg-ga
35
The categories of this paper are: mtrl-th
20
The categories of this paper are: acc-phys
4
The categories of this paper are: cond-mat
30
The categories of this paper are: q-alg