Gravity May Not Be the Reason Quantum Effects Vanish, Study Finds

A long-standing hypothesis regarding the boundary between quantum mechanics and classical physics has withstood one of its most rigorous experimental challenges. Scientists investigated whether gravity is responsible for suppressing quantum behavior in macroscopic objects, a concept often illustrated by the Schrödinger’s cat paradox.

Conducted at the Gran Sasso National Laboratory in Italy, the research involved positioning a highly shielded germanium detector deep beneath a mountain to minimize interference from cosmic radiation. The team spent 62 days searching for an extremely faint radiation signal. This signal was predicted by a specific theory proposing that microscopic fluctuations in spacetime—driven by gravitational forces—gradually collapse quantum superpositions into definite states.

The results yielded a null detection. No such gravitational signature was observed, suggesting that gravity may not be the mechanism that causes the strange rules of quantum mechanics to disappear in our everyday world. The findings indicate that other factors likely govern the transition from the quantum to the classical realm.