trailThe reported BEC analogue Hawking signal can be explained by amplified classical noise rather than quantum vacuum emission.
Spontaneous analogue Hawking radiation has been detected at sonic horizons in Bose-Einstein condensates.
Analogue Hawking radiation has been observed in laboratory systems.
Classical-seeding account· for
Amplification of thermal or classical fluctuations at a sonic horizon can produce cross-horizon correlations resembling spontaneous Hawking radiation.
Mode conversion at an analogue horizon amplifies incident fluctuations regardless of their quantum or classical origin.
Simulations of BEC sonic horizons with thermal phonon populations reproduce the cross-horizon density correlation pattern.
Stimulated Hawking emission has been measured at analogue horizons in water-wave experiments.
Stimulated analogue Hawking radiation has been observed in nonlinear optical systems.
The 2016 Technion measurement statistically established entanglement of the observed Hawking phonon pairs.
The uncertainties in the 2016 Technion entanglement analysis were underestimated.
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The 2016 Technion nonseparability test used phonon populations extrapolated from a fitted thermal spectrum rather than measured directly.
Subsequent Technion analogue black-hole experiments did not repeat the 2016 entanglement measurement.
Spontaneous-signature evidence· against
The correlation spectrum measured at a BEC sonic horizon was thermal at the temperature predicted by Hawking's formula.
Analogue gravity predicts that sonic horizons in flowing fluids emit thermal Hawking-like phonon radiation.
Theoretical models reproducing the 2019 BEC horizon correlation data predict significant departures from a thermal Hawking spectrum
The analogue Hawking radiation observed in the 2021 Technion experiment was stationary in time.
atomic
assumed
Steinhauer's Technion experiments observed correlated phonon pairs across a sonic horizon in a Bose-Einstein condensate.
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The reported BEC analogue Hawking signal can be explained by amplified classical noise rather than quantum vacuum emission.
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