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- Homework Statement
- How can we know that the initial mass of the universe was half of the Planck mass from the formula mass density of the Universe as a function of universal time?

- Relevant Equations
- (ρ reduced)(Tp)^2 = ρT^2

ρ reduced = 3c^5/(4hG^2)

I tried setting the Universal time T = Tp as when T = 0 there was no universe and thought Tp would be the first instance of the universe, but I still can't figure out how equation (3.1.3) implies that M0 = Mp/2

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