Table 1.
Theoretical and observed primordial abundances.
| Abundance | Theoretical | Observed |
|---|---|---|
| Yp | 0.24721 ± 0.00014 | 0.245 ± 0.003 |
| (D/H)×105 | 2.439 ± 0.037 | 2.547 ± 0.025 |
| (3He/H)×105 | 1.039 ± 0.014 | 1.1 ± 0.2 |
| (7Li/H)×1010 | 5.464 ± 0.220 | 1.6 ± 0.3 |
Notes. The theoretical abundances have been obtained in Pitrou et al. (2021). The observed abundances are the recommended values in the 2020 Particle Data Group BBN review, with representative references being Aver et al. (2015), Cooke et al. (2018), Bania et al. (2002), and Sbordone et al. (2010). We note that strictly speaking, the 3He value is not cosmological; see the main text for further discussion.
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