N15 — Helium-4 mass fraction $Y_p = 20/81$
N15: Helium-4 mass fraction $Y_p = 20/81$. metal-poor HII regions.
Falsification Details
Yp = 20/81. helium-4!prediction pred:n15 $Y_p = 20/81 = 0.2469$ (V.T245). Orthodox: fitted from $_B$. Observed: $0.2449 0.0040$.
metal-poor HII regions
ongoing.
Context
N15: Prediction
Yp = 20/81.
$Y_p = 20/81 = 0.2469$ (V.T245). Orthodox: fitted from $η_B$. Observed: $0.2449 ± 0.0040$. Experiment: metal-poor HII regions. Timeline: ongoing.
Derivation Context
The fiber suppression is selective: it affects only $A ≥ 7$ nuclei (those requiring EM radiative capture across the full $τ^3$ geometry). Light nuclei with $A ≤ 4$ fit the stride-3 macrocell and are unaffected:
- $Y_p$ ($^4He$): unchanged (voxel packing geometry, independent of $^7Be$ production).
- $D/H$: unchanged (set by deuterium bottleneck, not by $^7Be$ channel).
- $^3He/H$: unchanged ($A = (τ^3) = 3$, fits macrocell).
No BBN products have $5 ≤ A ≤ 6$ (the mass gaps at $A = 5$ and $A = 8$ in nuclear physics prevent their formation). The $τ$ framework therefore resolves the lithium problem selectively—without disturbing the other successful BBN predictions. (Registry: V.T245, V.T246, Wave 25.)