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4. One second after the Big Bang the cosmic plasma has cooled to a temperature
T - 1010 K, at which point the neutron to proton ratio freezes to
2 0.2,
Пр
with
and
Пр
being the number densities of neutrons and protons, respec-
tively. Estimate the primordial number abundance of Helium, assuming that
all neutrons are bound in He.
Transcribed Image Text:4. One second after the Big Bang the cosmic plasma has cooled to a temperature T - 1010 K, at which point the neutron to proton ratio freezes to 2 0.2, Пр with and Пр being the number densities of neutrons and protons, respec- tively. Estimate the primordial number abundance of Helium, assuming that all neutrons are bound in He.
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