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Energy density of massive neutrinos

  1. Oct 23, 2009 #1

    nicksauce

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    Does anyone have an up-to-date reference for the best value of [itex]\Omega_{\nu}[/itex], given our current understanding of neutrino masses? Dodelson's cosmology book has [itex]\Omega_{\nu}\approx 10^{-3}[/itex], but something more recent would be nice.
     
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  3. Oct 23, 2009 #2

    Wallace

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    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.
     
  4. Oct 24, 2009 #3

    Chalnoth

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    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 [itex]\Omega_\nu < 0.0065[/itex] at 95% confidence.
     
    Last edited by a moderator: May 4, 2017
  5. Oct 24, 2009 #4

    nicksauce

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    Thanks a lot.
     
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