Spacetime flows like a river, and a black hole is a whirlpool. Particles in this flow are like waves with their own rhythm: alternating crests and troughs. It turns out the whirlpool shifts the wave's rhythm from a distance, without even sucking it in.
Near a black hole, a quantum wave undergoes the same subtle shift, even though the particle doesn't cross the hole's edge. The role of the invisible field here is played by curved spacetime. Unexpectedly, the calculations yield the Raychaudhuri equation — it describes the expansion or contraction of matter in Einstein's theory.
Thus gravity gains a quantum voice.
The Aharonov-Bohm effect, once dismissed as fantasy, now underlies detectors that can find metal buried in the ground without a single touch.
In the film 'Interstellar,' the black hole's gravity warps time; the new effect adds a layer: it also whisper-changes the quantum rhythm, as if sending particles a secret message.