Energy density of massive neutrinos

1. Oct 23, 2009

nicksauce

Does anyone have an up-to-date reference for the best value of $\Omega_{\nu}$, given our current understanding of neutrino masses? Dodelson's cosmology book has $\Omega_{\nu}\approx 10^{-3}$, but something more recent would be nice.

2. Oct 23, 2009

Wallace

Not sure if the results get quoted like that these days, usually it's just the mass limits rather than translating that into a density parameter. I think the best constraints come from CMB plus galaxy power spectrum results, the biggest data set being the SDSS catalogue. I think there was a Tegmark paper in 2004 on this, though there is bound to be more recent work.

3. Oct 24, 2009

Chalnoth

This is probably about the best current measure:
http://lambda.gsfc.nasa.gov/product/map/current/params/lcdm_sz_lens_mnu_wmap5_bao_snall.cfm [Broken]

They estimate $\Omega_\nu < 0.0065$ at 95% confidence.

Last edited by a moderator: May 4, 2017
4. Oct 24, 2009

nicksauce

Thanks a lot.