Methods — literature protocol
This is a literature synthesis, not a new laboratory measurement. Methods here mean: how sources were found, how claims were classified, and how figures were generated.
Source search
- Parallel web/literature search for: Unruh 1981, Visser acoustic metric, Barceló Liberati Visser Living Review, Weinfurtner stimulated Hawking, Steinhauer BEC Hawking, sonic black hole Wikipedia (orientation only).
- Full-text extraction from PMC Living Review (DOI 10.12942/lrr-2011-3) and arXiv gr-qc/0505065 landing page.
- DOI verification: every DOI in the citation table was taken from publisher/arXiv pages, not invented from memory.
Source-class tiers
| Class | Examples in this paper |
|---|---|
| peer-reviewed | Nature, PRL, CQG, Living Reviews, EPJH |
| expert commentary | Unruh Physics Today 2016 |
| tertiary | Wikipedia (orientation; never primary evidence) |
Unit contract
| Unit | Meaning | Never silently call it |
|---|---|---|
| Acoustic horizon | Surface where (v = c_s) | Astrophysical event horizon |
| Phononic Hawking radiation | Thermal phonon emission from acoustic horizon | Proof of gravitational HR |
| Surface gravity (\kappa_{\mathrm{ac}}) | Flow-gradient measure at sonic point | Newtonian (GM/R^2) without mapping |
| Partner correlation | Horizon-crossing entanglement signature | Information paradox solution |
Figure generation
python3 scripts/make_figures.py
Produces deterministic SVG figures under site/static/images/ with svg.hashsalt = "dumbhole-v1" and stripped Date metadata for reproducible diffs.
What we did not do
- No BEC or water-flume experiment on this host (no cryogenics / flume hardware).
- No claim of new observational data.
- No invented DOIs or fabricated quote attribution.