Max Tegmark's library: 10par
Figure 3: The dark red region is ruled out by CMB alone. The orange red region
is ruled out if h=65 +/- 7 and the orange region is as well if the nucleosynthesis constraints
on the baryon density are correct.
Both an open and a closed Universe is seen to be allowed, but only with
a cosmological constant Lambda>0.
Please click here to get the postscript file with
the paper. For a color viewgraph with the figure above, please click on it or here.
you are interested in other research of mine.
Current cosmological constraints from a 10 parameter CMB analysis
Lambda is alive and well
We compute the constraints on a ``standard'' 10 parameter cold dark matter
(CDM) model from the most recent CMB and data and other observations, exploring
30 million discrete models and two continuous parameters. Our parameters are
the densities of CDM, baryons, neutrinos, vacuum energy and curvature, the
reionization optical depth, and the normalization and tilt for both scalar and
Our strongest constraints are on spatial curvature,
-0.24 < Omega_k < 0.38, and CDM density,
h^2 Omega_cdm <0.3, both at 95%.
Including SN 1a constraints gives a positive cosmological
constant at high significance. We explore the robustness of our results to
various assumptions. We find that three different data subsets give
qualitatively consistent constraints. Some of the technical issues that have
the largest impact are the inclusion of calibration errors, closed models,
nucleosynthesis constraints and 10-dimensional likelihood interpolation.
astro-ph/0002091, submitted to ApJ
Return to my home page
This page was last modified February 6, 2000.