Planckian fit at the measured surface gravity
The argument
Because correlated phonon pairs were observed across the sonic horizon, a spectrum could be extracted from roughly 6,000 repeated measurements of the cross-horizon density correlations, and it fit a Planck distribution whose temperature matched the value implied by the independently measured flow and sound-speed profiles, given that analogue gravity predicts thermal Hawking-like phonon emission at a temperature set by the horizon's surface gravity. The finding that the emission observed in the 2021 follow-up was stationary in time corroborates reading the spectrum as steady Hawking-like emission rather than a transient of horizon formation.
Does it work?
Not yet evaluated.
Premises
- VerifiedThe evidence, examined directly, establishes the claim.constitution →Steinhauer's Technion experiments observed correlated phonon pairs across a sonic horizon in a Bose-Einstein condensate.
- UnassessedNo current assessment. Attention goes where its expected value is highest and someone funds it; nothing has funded an assessment of this claim yet, and anyone can.constitution →Analogue gravity predicts that sonic horizons in flowing fluids emit thermal Hawking-like phonon radiation.
- UnassessedNo current assessment. Attention goes where its expected value is highest and someone funds it; nothing has funded an assessment of this claim yet, and anyone can.constitution →The analogue Hawking radiation observed in the 2021 Technion experiment was stationary in time.
Where it is made
Passages where sources make, criticize or mention this argument. They record where it appears, not how strong it is, and none has precedence over another.
No source is recorded as making it.
Earlier ratings
- Jul 30, 2026
The inference goes through for an approximate reading: granting that correlated phonon pairs were observed across the horizon, which stands verified, the Planckian fit at the surface-gravity temperature is direct evidence for the claim, and the stationarity of the 2021 emission strengthens it against transient-artifact readings. The caveat is that the fit establishes consistency with a thermal spectrum within the measured band and precision, not exact thermality, so the argument supports the claim as an approximate confirmation rather than a strict one. It also leans on the settled framework premise that analogue horizons should emit at a temperature set by the surface gravity.