A Vortex's Silent Patch Reveals Its Speed ⚡ экспресс
Original: "Transfer observables of rotating acoustic black holes from ray tracing: shadow centroid, redshift asymmetry and flux imbalance"
The shape of the silent patch around a water vortex shows how fast it spins.
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The sound shadow in a water vortex behaves almost like that of a black hole: the faster the water spins, the more the shadow shifts and distorts. Now we have a clear way to measure this in the lab and better understand the rotation of real black holes.
🎯 For real black holes, rotation also distorts the shadow: it becomes egg-shaped and shifts in the direction of rotation—just like in our water model.
🎬 In the movie Interstellar, the black hole Gargantua appears with an asymmetric shadow and a bright ring—exactly like our sound vortex, only for light.