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Flowing ultracold gases (Bose-Einstein condensates) and other fluids with sonic horizons, places where the flow outruns sound, let experiments test whether this glow survives changes at short distances.","title":"Trans-Planckian origin and laboratory analogs of Hawking radiation","topic_ref":null,"why":"Laboratory analogs are the only experimental access to Hawking's prediction, and the trans-Planckian question decides whether that prediction depends on unknown Planck-scale 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