Findings — figures and comparative map
This page embeds the pedagogical figures produced for the paper. They are original deterministic diagrams, not experimental data.
1. Acoustic horizon flow profile
Where the green flow-speed curve crosses the blue sound-speed line, phonons cannot escape upstream. That crossing is the acoustic event horizon of the dumb hole.
2. Sound-cone cascade
In the geometrical-acoustics limit, sound cones tip past vertical at the horizon — the same causal structure that light cones exhibit at a gravitational event horizon (cf. artistic impressions in Barceló–Liberati–Visser Living Review).
3. Program timeline
| Era | Result class | Anchor papers |
|---|---|---|
| 1974–2000 | Theory | Hawking 1974; Unruh 1981; Visser 1998; Garay 2000 |
| 2008–2011 | Classical / stimulated | Weinfurtner et al. 2011 PRL |
| 2010–2019 | Quantum fluids | Lahav 2010; Steinhauer 2014–16; de Nova et al. 2019 |
| 2020– | Extensions | Backreaction, superradiance, history of science |
4. Claim discipline
| Statement we endorse | Statement we reject |
|---|---|
| Analogue systems exhibit thermal phonon spectra set by surface gravity | “Hawking radiation from real black holes has been measured in a tank” |
| Partner correlations match the Hawking pair-production picture | “The information paradox is solved” |
| The kinematic argument is experimentally robust | “Analogue gravity proves quantum gravity” |
See the paper for full citations with DOIs.