Observation Is Not Reality: A What-If Demonstration of Observer-Motion-Induced Bias in Local H0 Inference

This record accompanies the GitHub repository **observer-motion-h0-bias**, which studies potential biases in inferred **H0** induced by the observer’s motion/trajectory modeling. The repository prioritizes **auditability and reproducibility**: key derived experimental artifacts (curves, bands, null tests, acceptance runs, and integrity anchors) are committed under `data/`, enabling third parties to reproduce and cross-check results without ambiguity. **Implementation conventions (consistent with `src/`):** - Line-of-sight (LOS): observer → source - Radial velocity sign: positive means approaching - Doppler: `z_kin = sqrt((1-β)/(1+β)) - 1`, `β = v_rad/c` - Geometry term: off by default (`include_geom=False`), enabled only for controlled comparisons **Audit PDFs (CN/EN):** - See `docs/audit_pdfs/` in the GitHub repository for reader-friendly audit reports. **External data policy (not redistributed here):** Due to size/licensing constraints, this record (and the GitHub repository) does **not** redistribute: - Pantheon+SH0ES DataRelease (`data/external/DataRelease-main/`) - Union3 external release package (`data/external/union3_release/`) Users should obtain them from official sources and place them as documented in the repository. **Note on text vs. code:** If any derivation text differs from the implementation, treat `src/` and the verifiable artifacts under `data/acceptance/` as the ground truth. Issues/PRs that improve documentation alignment are welcome. --- 本记录对应 GitHub 仓库 **observer-motion-h0-bias**,研究“观测者运动/轨迹建模”对 **H0** 推断的潜在系统偏差。本仓库以**可追责复现与审计**为第一优先级:关键派生产物(曲线、band、null tests、acceptance runs、SHA256 完整性锚点)均在 `data/` 中落盘并公开,以便第三方逐项复核。 **实现约定(与 `src/` 一致):** - LOS:observer→source - 径向速度符号:`v_rad > 0` 表示靠近(approaching) - 多普勒:`z_kin = sqrt((1-β)/(1+β)) - 1`,`β = v_rad/c` - 几何项:默认关闭(`include_geom=False`),仅用于对照实验 **审计 PDF(中/英):** - GitHub 仓库 `docs/audit_pdfs/` 提供读者友好的审计报告 PDF。 **外部数据声明(不再分发):** 出于体量/许可原因,本记录与 GitHub 仓库不再分发: - Pantheon+SH0ES DataRelease(`data/external/DataRelease-main/`) - Union3 外部发布包(`data/external/union3_release/`) 使用者需自行从官方渠道获取并按仓库文档放置。 **文字推导与代码不一致时:** 若“推导文档/说明文字”与代码实现存在不一致,以 `src/` 实现与 `data/acceptance/` 的可复核产物为准;欢迎提交 issue/PR 协助对齐。