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Homework Help: In a radiation dominated era, how do I show this?

  1. Oct 17, 2015 #1
    As above. In a radiation dominated how do I show this equation?
    http://i.imgur.com/nMwxvD5.png (It's easier for me to post the image to imgur than use latex.

    I know g is the relativistic degrees of freedom.
    I think that the scale factor a(t) is proportional to 1/t
    and that a(T) is proportional to 1/T

    I think it might have something to do with,

    s= s/v = (E+P)/KbT
    and s=(1+w) Pc^2/KbT

    but other than that, I don't know where to start :/ Any help would be appreciated :)
  2. jcsd
  3. Oct 22, 2015 #2
    Thanks for the post! This is an automated courtesy bump. Sorry you aren't generating responses at the moment. Do you have any further information, come to any new conclusions or is it possible to reword the post?
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