Using (4.47), calculate the current characteristic velocity of neutrinos that decoupled in the early phase of the Big Bang. The expansion law XXXXXXXXXXyields the cosmic time vs. temperature. Why does...

Using (4.47), calculate the current characteristic velocity of neutrinos that decoupled in the early phase of the Big Bang. The expansion law (4.61) yields the cosmic time vs. temperature. Why does this relation not depend on the Hubble constant? Why does the helium yield Y depend on the combination ?bh2— see (4.68)—and not just on ?b?

Jan 12, 2022
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