Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The Cosmological Parameters 2005

  1. Jan 9, 2006 #1

    marcus

    User Avatar
    Science Advisor
    Gold Member
    2015 Award
    Dearly Missed

    this just came out

    http://arxiv.org/abs/astro-ph/0601168

    it is an update, as of year-end 2005, of the best estimates of the values of the main cosmological parameters

    like the Hubble parameter
    and the dark energy density (or cosm. const.)
    and the Omega number which is used to indicate how close to being spatially flat the universe is.

    AFAIK there are no surprises here, the Hubble parameter is still 73 km/s per Megaparsec, and so on. but here it is if you want an up-to-date reference on the basic numbers
     
  2. jcsd
  3. Jan 10, 2006 #2

    EL

    User Avatar
    Science Advisor

    Nice review!

    Looking forward to see what the new data from WMAP will tell us. Rumours say they will be released any day (as if we havn't heard that before...:rolleyes:).
     
  4. Jan 10, 2006 #3

    Garth

    User Avatar
    Science Advisor
    Gold Member

    Interestingly, there still seems to be debate over the accepted value of Hubble's constant.

    That paper gives the LCDM-WMAP fitted value of
    H0 = 73 ± 3 km/sec/Mpsc whereas Tammann's paper The Ups and Downs of the Hubble Constant gives the value:
    The two values are almost consistent if we take the extreme limit on the lower error bar for the 'WMAP' value (70) and the extreme limit on the upper error bar for the 'Tammann' value (69.8), but one wonders if the age of 'precision cosmology' is not so precise after all.

    Garth
     
    Last edited: Jan 10, 2006
  5. Jan 11, 2006 #4

    Chronos

    User Avatar
    Science Advisor
    Gold Member
    2015 Award

    I cast aside Tamman's paper with predudice. He appears to ignore a great deal of good observational evidence.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?



Similar Discussions: The Cosmological Parameters 2005
Loading...