# UTFANSWF v21 — H₀ Layered Tension Report

**Context:** DIAGNOSTIC_NON_GATING

## Summary

| Layer | Key Feature | Value |
|---|---|---:|
| CMB ℓ_A | pull σ | 4.412 |
| SN z=0.35 | pull σ | -2.635 |
| SN pivot curvature | σ | -3.720 |
| BAO H-D_M gap | σ | 2.985 |
| SH0ES | pull σ | -5.423 |

## Interpretation

- The H0 tension decomposes into three layers: early-universe acoustic anchoring (CMB ℓ_A), intermediate BAO projection geometry, and late-universe SN distance curvature.
- CMB ℓ_A is a high-significance anchor requiring only ~0.13% shift to eliminate its residual, indicating extreme sensitivity to compressed representation.
- SN midpoint residual at z=0.35 forms a curvature pivot that survives global offset removal, indicating intrinsic geometry rather than simple calibration shift.
- BAO z≈0.706 shows a radial/transverse projection split, indicating internal bridge stress rather than a unified expansion solution.
- SH0ES represents a high-side overlay that amplifies, but does not solely create, the late-universe tension.
- The tension is therefore layered and geometric, not attributable to a single parameter mismatch.

## Verdict

H0_layered_tension_structure_identified; no physics, thresholds, datasets, parameters, or gate verdict changes.
