AWhat changed
In 2008 Rousseaux and colleagues reported negative comoving-frequency waves in a driven water channel with varying flow, interpreting mode conversion as a classical analogue of a Hawking process. In a separate water-channel experiment reported in 2010, Weinfurtner and colleagues measured positive- and negative-norm converted components across nine driving frequencies and compared their ratio with a thermal-like exponential law. These related but distinct experiments have different teams and conditions.
Scientific scope
In 2008 Rousseaux and colleagues reported negative comoving-frequency waves in a driven water channel with varying flow, interpreting mode conversion as a classical analogue of a Hawking process. In a separate water-channel experiment reported in 2010, Weinfurtner and colleagues measured positive- and negative-norm converted components across nine driving frequencies and compared their ratio with a thermal-like exponential law. These related but distinct experiments have different teams and conditions. Both observations involve driven classical water waves, not spontaneous quantum emission or radiation from an astrophysical black hole. In the 2008 experiment the cleanest data were taken below the group-velocity-horizon condition; the observed conversion exceeded a simplified model, and turbulence, nonlinearity and three-dimensional effects were not resolved. The 2010 mapping uses wave-flow assumptions, and the authors note uncertainty in a predicted effective temperature because the blocking region is not the usual phase-velocity horizon. Its finite-frequency fit is not proof of universal thermality. In the 2010 v1 Figure 5b prints an intercept of 0.81 while the text calls the offset close to zero within error; the plotted amplitude-ratio notation and norm formula also need reconciliation. The observations and distinct author teams should not be conflated.
Evidence
The linked original works support the scoped statement and contribution attribution. WRS has not independently replayed experiments or reconstructed a full mathematical proof. Both observations involve driven classical water waves, not spontaneous quantum emission or radiation from an astrophysical black hole. In the 2008 experiment the cleanest data were taken below the group-velocity-horizon condition; the observed conversion exceeded a simplified model, and turbulence, nonlinearity and three-dimensional effects were not resolved. The 2010 mapping uses wave-flow assumptions, and the authors note uncertainty in a predicted effective temperature because the blocking region is not the usual phase-velocity horizon. Its finite-frequency fit is not proof of universal thermality. In the 2010 v1 Figure 5b prints an intercept of 0.81 while the text calls the offset close to zero within error; the plotted amplitude-ratio notation and norm formula also need reconciliation. The observations and distinct author teams should not be conflated.
Contributors
- The named authors in the research record · SCIENCE: These are the listed authors of the cited contribution sources. Paper authorship does not quantify individual effort. An incomplete list is explicitly marked; same names are not automatically merged.
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Provisional WRS assessment, edition 2026-10-28.1. Independent expert calibration is pending. This grade does not certify correctness or assign ownership.
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