Scientists observe Einstein's gravity in the quantum world

An international team of scientists, including Nobel Prize-winning physicist Professor Sir Roger Penrose, has observed a long-predicted effect of gravity on a falling quantum object for the first time. This groundbreaking experiment, led by researchers from Ben-Gurion University of the Negev, the University of Ulm, and the University of Oxford, has been published in Science Advances.

The researchers used a new apparatus called the Quantum Galileo Interferometer to split the quantum wave associated with an atom into two paths: one held stationary and the other allowed to fall freely under gravity. By comparing the two paths, they confirmed that the equivalence principle—a cornerstone of Einstein's theory of gravity—remains consistent with the behavior of matter in the quantum world.

This discovery brings physicists one step closer to understanding how the two seemingly incompatible descriptions of nature—quantum mechanics and Einstein's theory of gravity—might be reconciled.

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