Can Gravity Repel? A Quantum Trick ⚡ экспресс
Gravity is usually considered an attractive force. However, if a massive body is in a quantum superposition (a state where it's in different places at once), a test particle might experience repulsion. This effect arises from an anomalous negative weak value (a quantum mechanical quantity) and suggests that the gravitational field can be in a superposition, and therefore spacetime itself. An experiment with spin-endowed nanocrystals is proposed to test this fascinating phenomenon.
The usual picture: gravity always pulls. But if a mass is in two places at once, like a double-exposure photograph, everything flips. Quantum theory allows a particle to be both there and here—literally. When we 'develop' this snapshot—that is, pinpoint where the object actually was—a test body feels a push away. No wind, just a quantum paradox.
This works thanks to weak negative values: a post-measurement rewrites the history of movement. It seems as if the very fabric of space bends backwards for an instant. An experiment with nanodiamonds will check if this is true, and help understand the quantum nature of ripples in space, dark energy, and black holes.
🎯 The weak values effect was theoretically predicted by [scientist:Yakir Aharonov]Yakir Aharonov[/scientist] in 1988.
🎬 No antigravity 'backpacks' from sci-fi—this repulsion is fleeting and works by the laws of chance.