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E ffective relativistic degrees of freedom of the early universe

  1. Apr 12, 2012 #1
    1. The problem statement, all variables and given/known data
    Calculate the number g* of effective relativistic degrees of freedom as the universe
    cools through the temperature ranges (i) T > 103 GeV, (ii) 1 MeV < T < 100 MeV,
    and (iii) T < 0:1 MeV.


    2. Relevant equations
    for the equation that is required to be used look the attachement/


    3. The attempt at a solution
    this equation is taken from the website:
    http://ned.ipac.caltech.edu/level5/Sept03/Trodden/Trodden4_2.html

    the question is what must be substituted in this equation in order to obtain g*.
    The temperature T is the actual temperature of the background plasma,
     

    Attached Files:

  2. jcsd
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