Table 5.
Constraints on Δα/α and Δ for the Unification, Dilaton, and Clocks models (with the range of values within Δχ2 = 1 of it, corresponding to the 68.3% confidence level for a Gaussian posterior likelihood), together with the derived nuclide abundances for each of the best-fit models.
| Parameter | Unification | Dilaton | Clocks |
|---|---|---|---|
 (ppm), Null |
5.8 ± 2.0 | 7.3 ± 3.3 |  |
 (ppm), Baseline |
6.0 ± 2.0 | 8.0 ± 3.4 |  |
| Δ | 0.64 ± 0.09 | 0.65 ± 0.09 | 0.64 ± 0.09 |
| Yp | 0.247 ± 0.001 | 0.249 ± 0.001 | 0.247 ± 0.002 |
| (D/H)×105 | 2.55 ± 0.05 | 2.52 ± 0.05 | 2.45 ± 0.07 |
| (3He/H)×105 | 1.02 ± 0.02 | 0.96 ± 0.04 | 1.04 ± 0.07 |
| (7Li/H)×1010 (Cos) | 4.42 ± 0.25 | 4.51 ± 0.24 | 5.36 ± 0.26 |
| (7Li/H)×1010 (Ast) | 1.59 ± 0.52 | 1.58 ± 0.52 | 1.92 ± 0.60 |
Notes. For lithium-7 we separately list the cosmological (primordial) abundance and the corresponding astrophysical abundance, corrected for the preferred depletion. The results are for the Baseline scenario, with the exception of the first row, which shows the value of Δα/α in the Null case for comparison.
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