# LIB2-168 — The trace-built MacDowell–Mansouri action is a signature-sector candidate

- class: CLAIM · review_state: PUBLISHED · house_tier: not yet assigned
- labels as printed: math_status NOT_PRINTED · attachment NOT_PRINTED · scorecard tier word none (PDF p.303)
- basis: {"pdf_sha256_prefix": "b64ddcd9e16a6dcd", "release": "Rev33.1_S369"}

## Statement

The trace-built MacDowell–Mansouri action is a candidate parent for the signature/Cartan sector, yielding Einstein–Hilbert plus a cosmological term after the Euler discard.

## Caution

This candidate is not the full particle, generation, gauge or mass action and does not restore the rejected parent-action route.

## Primary source

Appendix T, §5, Named datum 5.4: candidate action, PDF p.320: "The signature-sector parent action — candidate"

## Machine

- url: /library-v2/LIB2-168/
- content_sha256: 9de858e717581798e4ec7494a1a91bc2e62f2ebb7673a96efe8b4d4a0cf3899f
- candidate_ids: C2-091

## Freshness

- BUILD_STAMP S371a · 2026-09-26T22:53Z · master 01d1a5873ede42f5 · cut 9dcc6ce9a8ee3e02
- Declared volatile fields (R36): BUILD_STAMP