Non-linear Processes and Stimulated Hawking Radiation in Hydrodynamics\n for Decelerating Subcritical Free Surface Flows with a Subluminal Dispersion\n Relation
Bibliographic record
Abstract
In \cite{PRL2011}, the authors have {\it "conducted experiments in order to verify the thermal nature of the stimulated Hawking process at a white hole horizon in a fluid analogue gravity system"} namely the linear mode conversion giving rise to negative energy waves i.e. the classical ingredient at the root of the Hawking effect in astrophysics. However, here we show that these experiments in Vancouver operated in a weakly non-linear regime that obscure them as was the case for the seminal experiments in Nice within a stronger non-linear regime \cite{NJP2008}. We finally shed some light on these matters by demonstrating that the linear conversion of water waves on a counter-current takes place with or without a dispersive white hole horizon as anticipated in the Nice experiment no matter the frequency is conserved within the entire process provided there is an absence of wave breaking during the wave-current interaction. The main novelty is the role of free (and not forced as usual in non-linear effects) harmonics generation in the interpretation of both the Nice (for at least the stimulating mode) and Vancouver (for the converted modes only) experiments. Unfortunately, the thermality of the spectrum is not demonstrated in the Poitiers reproduction of the Vancouver experiments based on the analysis of the scattering coefficients themselves and not just of their ratio as was done previously.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.000 |
| Science and technology studies | 0.001 | 0.002 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.000 | 0.001 |
| Research integrity | 0.001 | 0.001 |
| Insufficient payload (model declined to judge) | 0.002 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".