Max Tegmark's library: 9par
Figure 3: When including reionization and gravity waves,
the yellow constraints go away, allowing a closed Universe. However, Lambda=0
is still ruled out if you take the supernova 1a constraints seriously.
Please click here to get the postscript file with
the paper. Here's color viewgraphs with fig 1, fig
2 and fig 3 - you can also click on the images.
you are interested in other research of mine.
Cosmological constraints from current CMB and SN 1a data:
a brute force 8 parameter analysis
We describe constraints on a ``standard'' 8 parameter
open cold dark matter (CDM) model from the most recent
CMB and SN1a data.
Our parameters are the densities of CDM, baryons, vacuum energy and
curvature, the reionization optical depth, and the
normalization and tilt for both scalar and tensor fluctuations.
We find that although the possibility of reionization
and gravity waves substantially weakens the
constraints on CDM and baryon density, tilt, Hubble constant
and curvature, allowing e.g. a closed Universe,
open models with vanishing cosmological constant are still strongly
astro-ph/9809201, accepted for publication in ApJL
Figure 1: These 3 models are completely different physically,
but cant be discriminated by the data.
One has n=1, another n=1.4.
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This page was last modified February 2, 1999.