A subtle attraction between metallic strips could reveal the theorized but never detected particles that impart gravity.
An experiment proposed in a Feb. 27 Physical Review Letters paper would explore whether fleeting waves of gravity in a vacuum perceptibly nudge two lead plates together. Detecting this attractive force, known as the gravitational Casimir effect, would prove the existence of gravitons — theorized particles that transfer gravitational force between matter. Yet the experiment’s success hinges on a controversial interpretation of how gravity interacts with certain types of matter.
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