Observable detail · COSMOLOGY
SH0ES Cepheid H_0
pre-dictive win at 0.02σ
| Prediction | H_phys = H_E/√P_0 = 73.019 km/s/Mpc |
|---|---|
| Measured | 73.04 ± 1.04 (SH0ES) |
| Residual | 0.02σ |
| Status | hit |
| Source paper | DCT-COS-01 |
Mechanism
Jordan-frame Hubble constant: H_phys = H_E/√P_0 with H_E (Einstein-frame, Planck CMB inferred) = 67.36, P_0 = 0.851. Computes 67.36/√0.851 = 73.019 km/s/Mpc. Pre-dictive: this prediction was on record before the SH0ES central value drifted to 73.04 ± 1.04.
Derivation
Jordan-frame Hubble constant: H_phys = H_E/√P_0 with H_E (Einstein-frame, Planck CMB inferred) = 67.36, P_0 = 0.851. Computes 67.36/√0.851 = 73.019 km/s/Mpc. Pre-dictive: this prediction was on record before the SH0ES central value drifted to 73.04 ± 1.04.
The closed-form prediction is
$$ \text{predicted} = H_phys = H_E/√P_0 = 73.019 km/s/Mpc $$against the measurement 73.04 ± 1.04 (SH0ES), giving residual 0.02σ.
Python verification
The verification script for this observable is cosmology_tests.py. Run it with python3 cosmology_tests.py to reproduce the canonical DCT result against the public-archive measurement source listed above (Riess et al. 2022 (SH0ES Cepheid + SN Ia ladder).).
References
- Riess et al. 2022
- Source paper: DCT-COS-01
Back to all observables or the predictions table.