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## GR0877 Problem 20

PROBLEM STATEMENT: This problem is still being typed.

SOLUTION: (A) The temperature dependence of the radiation is $T_r \propto a^{-1}$, where $a$ is the cosmic scale factor. Thus, when the temperature was higher by a factor of 4 (12/3 = 4), the distances were four times smaller than today. See Misner, Thorne and Wheeler, “Gravitation”, Chapter 28.

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