# Source for the margin of error of curvature

1. Jul 30, 2009

### zeebo17

I have seen in a few places around the web that the margin of error for the flatness of the universe is about 2%, but haven't seen any citations. Could anyone refer me to a reputable paper that I could cite that mentions what this margin of error is?

Thanks!

2. Jul 30, 2009

### nicksauce

3. Jul 31, 2009

### Chalnoth

You can get better constraints by adding baryon acoustic oscillation and supernova data to the WMAP result. They estimate the following parameters for w = constant:
http://lambda.gsfc.nasa.gov/product/map/current/params/owcdm_sz_lens_wmap5_bao_snall.cfm [Broken]

The curvature parameter is:
$$-0.0175 < \Omega_k < 0.0085$$ (95% confidence)

...which is a significantly tighter confidence interval than is given in the above paper.

Last edited by a moderator: May 4, 2017
4. Aug 1, 2009

### zeebo17

Great, thanks!