Scientists explored what the quantum wave function of the Universe looks like in curved spacetime. If we allow the world's boundary to fluctuate freely, the result includes an imaginary phase — like an echo from a parallel reality. If we fix the boundary, everything becomes real and positive. So what determines whether we encounter illusion or reality?
Stephen Hawking imagined that the universe was born not from an explosion, but by smoothly emerging from a quantum 'nothing.' In worlds with concave geometry (anti-de Sitter space), such a birth acquires a rim—like the hoop of a drum. Physicists compared two instruments: in one, the rim is bolted down tight; in the other, it vibrates freely. The free rim introduced an unexpected phase shift into the quantum sound—a rhythmic hiccup that depends on the number of dimensions. It’s as if the same note changes color just because the frame is trembling.
This subtle vibration isn’t just a detail—with a rigid rim, our universe would be mathematically unworkable. The fate of the world is decided at its trembling edges, linking worlds of different dimensions into a single quantum dance.
🎯 The phase shift caused by trembling is a quantum 'nudge' without which our world would be mathematically impossible.