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πŸŽ› Parameters

πŸ“ Abundances

Temperature
β€”
n/p ratio
β€”
He-4 Yp
β€”
D/H (Γ—10⁡)
β€”
He-3/H (Γ—10⁡)
β€”
Li-7/H (Γ—10¹⁰)
β€”
Proton (p)
Neutron (n)
Deuterium (D)
Helium-3 (Β³He)
Helium-4 (⁴He)
Lithium-7 (⁷Li)

ℹ️ About

Big Bang Nucleosynthesis (BBN) occurred in the first ~20 minutes after the Big Bang. Neutrons and protons combined to form deuterium, helium-3, helium-4, and lithium-7. The n/p ratio froze out at ~1/7 when T ~ 0.8 MeV (t β‰ˆ 2s). ~25% of all baryonic mass became helium-4 β€” a cornerstone of modern cosmology. The baryon density Ξ©bhΒ² controls the final abundances.

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